refactor: simplify app bootstrap and root errors

TECH_DEBT_AUDIT.md

@@ -0,0 +1,131 @@
+# Fast Messenger Tech Debt Audit
+
+## Critical
+
+### `core/network/src/main/kotlin/dev/meloda/fast/network/interceptor/Error14HandlingInterceptor.kt`
+- captcha flow is built around `wait/notify`, a raw executor, and shared mutable state.
+- risk: deadlocks, leaked jobs, hard-to-reproduce auth hangs.
+- fix: rewrite as suspend-based flow with timeout and explicit cancellation.
+
+### `core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollEventParser.kt`
+- file mixes parsing, dispatching, IO loading, and concurrency orchestration.
+- risk: regressions when VK event format changes.
+- fix: split by event family and add parser tests.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryViewModelImpl.kt`
+- view model is doing too much: loaders, navigation, selection, long poll hooks, read peers, dialog flow.
+- risk: brittle state transitions and untestable branching.
+- fix: extract coordinators/handlers per concern.
+
+### `app/src/main/kotlin/dev/meloda/fast/MainViewModel.kt`
+- root bootstrap handles auth, locale, long poll, permissions, profile, and start destination in one class.
+- risk: startup bugs and hidden coupling between flows.
+- fix: move startup/permission orchestration into dedicated controllers.
+
+### `app/src/main/kotlin/dev/meloda/fast/presentation/RootScreen.kt`
+- root composable owns too many top-level flows and dialogs.
+- risk: UI orchestration drift and hard-to-read navigation logic.
+- fix: split dialogs, bootstrap, and navigation concern into smaller composables.
+
+## High
+
+### `core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollEventParser.kt`
+- uses many `Log.d` calls and large `when` branches.
+- fix: reduce logging noise and add structured tracing only where needed.
+
+### `core/network/src/main/kotlin/dev/meloda/fast/network/ResponseConverterFactory.kt`
+- double-parsing response bodies and only logging malformed payloads.
+- risk: opaque failures and harder debugging.
+- fix: normalize error conversion and surface typed failures.
+
+### `feature/profile/src/main/kotlin/dev/meloda/fast/profile/ProfileViewModel.kt`
+- `loadAccountInfo()` has an empty error branch.
+- risk: profile can fail silently.
+- fix: set `baseError` and show fallback UI.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/attachments/Attachments.kt`
+- attachment preview logic still sits in UI layer and mixes fallback behavior.
+- risk: silent drops of unsupported attachments.
+- fix: move preview mapping to domain/ui-model layer.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/Link.kt`
+- title handling is nullable and duplicated with preview logic.
+- fix: create a small UI model for link rendering.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/File.kt`
+- preview extraction is inline and branches on raw model internals.
+- fix: extract to mapper/UI model.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/MessagesList.kt`
+- message-item interaction is dense and repeated.
+- fix: normalize scroll/reply handlers and reduce nested callbacks.
+
+## Medium
+
+### `core/data/src/main/kotlin/dev/meloda/fast/data/VkUsersMap.kt`
+- lookup helpers were using unsafe assumptions on external data.
+- status: already improved, but should stay covered by tests.
+
+### `core/data/src/main/kotlin/dev/meloda/fast/data/VkGroupsMap.kt`
+- same risk profile as users map.
+- status: already improved, still needs tests.
+
+### `core/domain/src/main/kotlin/dev/meloda/fast/domain/OAuthUseCaseImpl.kt`
+- auth success mapping used forced unwraps on server data.
+- status: already improved, but auth contract should be validated.
+
+### `app/src/main/kotlin/dev/meloda/fast/presentation/MainActivity.kt`
+- service lifecycle now respects config changes, but app exit semantics should be documented.
+- fix: keep explicit separation of app-close vs config-change behavior.
+
+### `build-logic/convention/src/main/kotlin/dev/meloda/fast/KotlinAndroid.kt`
+- build-tools are pinned to the local environment.
+- risk: portable builds may drift between machines.
+- fix: prefer SDK-managed consistency or document required SDK version.
+
+### `app/src/main/kotlin/dev/meloda/fast/presentation/RootErrorDialog.kt`
+- currently hardcodes English strings for some errors.
+- fix: localize all texts through resources.
+
+### `app/src/main/kotlin/dev/meloda/fast/presentation/RootScreen.kt`
+- root-level error dialog is better, but some orchestration still remains in the root composable.
+- fix: split into smaller root flows over time.
+
+## Low
+
+### `core/ui/src/main/kotlin/dev/meloda/fast/ui/components/AnimatedDots.kt`
+- marked TODO rewrite.
+- fix when touching related loading UI.
+
+### `core/ui/src/main/kotlin/dev/meloda/fast/ui/theme/AppTheme.kt`
+- color picker TODO suggests unfinished theme customization.
+
+### `core/model/src/main/kotlin/dev/meloda/fast/model/api/data/LongPollUpdates.kt`
+- `List<List<Any>>` is a weakly typed API boundary.
+- fix: introduce explicit event DTOs.
+
+### `core/model/src/main/kotlin/dev/meloda/fast/model/api/domain/VkMessage.kt`
+- attachment persistence is still a TODO area.
+
+### `core/model/src/main/kotlin/dev/meloda/fast/model/database/VkMessageEntity.kt`
+- attachment storage/restoration is unresolved.
+
+### `core/common/src/main/kotlin/dev/meloda/fast/common/model/LongPollState.kt`
+- Android 15 support TODO.
+
+### `feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryViewModelImpl.kt`
+- large commented-out legacy block should be removed once upload flow is reimplemented.
+
+### `feature/auth/src/main/kotlin/dev/meloda/fast/auth/login/LoginViewModel.kt`
+- debug/auth token acquisition TODO indicates unfinished auth path.
+
+## What To Do First
+1. Rewrite captcha interceptor.
+2. Split `LongPollEventParser`.
+3. Extract `MessagesHistoryViewModelImpl` orchestration.
+4. Localize `RootErrorDialog` strings.
+5. Add tests for auth, long poll parsing, and attachment mapping.
+
+## Note
+- Current code is already better on crash-prone nullable handling and service lifecycle.
+- Remaining work is mostly structural and testability-focused.

app/src/main/kotlin/dev/meloda/fast/MainViewModel.kt

@@ -2,7 +2,6 @@ package dev.meloda.fast
 
 import android.content.Intent
 import android.os.Build
-import android.util.Log
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.app.NotificationCompat
 import androidx.core.os.LocaleListCompat
@@ -38,6 +37,7 @@ interface MainViewModel {
     val startDestination: StateFlow<Any?>
     val isNeedToReplaceWithAuth: StateFlow<Boolean>
     val currentUser: StateFlow<VkUser?>
+    val baseError: StateFlow<BaseError?>
 
     val isNeedToShowNotificationsDeniedDialog: StateFlow<Boolean>
     val isNeedToShowNotificationsRationaleDialog: StateFlow<Boolean>
@@ -45,6 +45,7 @@ interface MainViewModel {
     val isNeedToRequestNotifications: StateFlow<Boolean>
 
     fun onError(error: BaseError)
+    fun onErrorConsumed()
 
     fun onNavigatedToAuth()
 
@@ -73,6 +74,7 @@ class MainViewModelImpl(
     override val startDestination = MutableStateFlow<Any?>(null)
     override val isNeedToReplaceWithAuth = MutableStateFlow(false)
     override val currentUser = MutableStateFlow<VkUser?>(null)
+    override val baseError = MutableStateFlow<BaseError?>(null)
 
     override val isNeedToShowNotificationsDeniedDialog = MutableStateFlow(false)
     override val isNeedToShowNotificationsRationaleDialog = MutableStateFlow(false)
@@ -82,6 +84,10 @@ class MainViewModelImpl(
     private var openNotificationsSettings = false
     private var openAppSettings = false
 
+    init {
+        listenLongPollState()
+    }
+
     override fun onError(error: BaseError) {
         when (error) {
             BaseError.SessionExpired,
@@ -89,9 +95,15 @@ class MainViewModelImpl(
                 isNeedToReplaceWithAuth.update { true }
             }
 
-            else -> Unit // TODO: 21-Mar-25, Danil Nikolaev: show error in ui
+            else -> {
+                baseError.update { error }
             }
         }
+    }
+
+    override fun onErrorConsumed() {
+        baseError.update { null }
+    }
 
     override fun onNavigatedToAuth() {
         isNeedToReplaceWithAuth.update { false }
@@ -203,10 +215,6 @@ class MainViewModelImpl(
         viewModelScope.launch(Dispatchers.IO) {
             val currentAccount = getCurrentAccountUseCase()
 
-            Log.d("MainViewModel", "currentAccount: $currentAccount")
-
-            listenLongPollState()
-
             if (currentAccount != null) {
                 UserConfig.apply {
                     this.userId = currentAccount.userId

app/src/main/kotlin/dev/meloda/fast/presentation/MainActivity.kt

@@ -9,7 +9,6 @@ import android.content.res.Configuration
 import android.os.Build
 import android.os.Bundle
 import android.provider.Settings
-import android.util.Log
 import androidx.activity.SystemBarStyle
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
@@ -65,9 +64,6 @@ class MainActivity : AppCompatActivity() {
 
         setContent {
             val viewModel: MainViewModel = koinViewModel<MainViewModelImpl>()
-            LaunchedEffect(viewModel) {
-                Log.d("VM_CREATE", "onCreate: viewModel: $viewModel")
-            }
 
             LifecycleResumeEffect(true) {
                 viewModel.onAppResumed(intent)

app/src/main/kotlin/dev/meloda/fast/presentation/MainScreen.kt

@@ -45,6 +45,7 @@ import dev.meloda.fast.friends.navigation.friendsScreen
 import dev.meloda.fast.model.BaseError
 import dev.meloda.fast.model.BottomNavigationItem
 import dev.meloda.fast.navigation.MainGraph
+import dev.meloda.fast.profile.navigation.Profile
 import dev.meloda.fast.profile.navigation.profileScreen
 import dev.meloda.fast.ui.theme.LocalBottomPadding
 import dev.meloda.fast.ui.theme.LocalHazeState
@@ -69,15 +70,18 @@ fun MainScreen(
     val theme = LocalThemeConfig.current
     val hazeState = remember { HazeState(true) }
     val navController = rememberNavController()
-
+    val defaultTabIndex = remember(navigationItems) {
-    var selectedItemIndex by rememberSaveable {
+        navigationItems.indexOfFirst { it.route == ConvoGraph }.takeIf { it >= 0 } ?: 0
-        mutableIntStateOf(1)
     }
 
-    BackHandler(enabled = selectedItemIndex != 1) {
+    var selectedItemIndex by rememberSaveable {
+        mutableIntStateOf(defaultTabIndex)
+    }
+
+    BackHandler(enabled = selectedItemIndex != defaultTabIndex) {
         val currentRoute = navigationItems[selectedItemIndex].route
 
-        selectedItemIndex = 1
+        selectedItemIndex = defaultTabIndex
         navController.navigate(navigationItems[selectedItemIndex].route) {
             popUpTo(route = currentRoute) {
                 inclusive = true
@@ -127,7 +131,7 @@ fun MainScreen(
                             }
                         },
                         icon = {
-                            if (index == navigationItems.size - 1) {
+                            if (item.route == Profile) {
                                 var isLoading by remember {
                                     mutableStateOf(true)
                                 }

app/src/main/kotlin/dev/meloda/fast/presentation/RootErrorDialog.kt

@@ -0,0 +1,38 @@
+package dev.meloda.fast.presentation
+
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
+import dev.meloda.fast.model.BaseError
+import dev.meloda.fast.ui.R
+
+@Composable
+fun RootErrorDialog(
+    baseError: BaseError?,
+    onDismiss: () -> Unit,
+    onConfirm: () -> Unit,
+) {
+    if (baseError == null) return
+
+    val errorText = when (baseError) {
+        BaseError.ConnectionError -> "Connection error"
+        BaseError.InternalError -> "Internal error"
+        BaseError.UnknownError -> "Unknown error"
+        is BaseError.SimpleError -> baseError.message
+        BaseError.SessionExpired -> "Session expired"
+        BaseError.AccountBlocked -> "Account blocked"
+    }
+
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(text = stringResource(id = R.string.warning)) },
+        text = { Text(text = errorText) },
+        confirmButton = {
+            TextButton(onClick = onConfirm) {
+                Text(text = stringResource(id = R.string.try_again))
+            }
+        }
+    )
+}

app/src/main/kotlin/dev/meloda/fast/presentation/RootScreen.kt

@@ -4,16 +4,12 @@ import android.Manifest
 import android.content.Intent
 import android.net.Uri
 import android.provider.Settings
-import android.util.Log
 import androidx.activity.compose.LocalActivity
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.material3.AlertDialog
-import androidx.compose.material3.Text
-import androidx.compose.material3.TextButton
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
 import androidx.compose.runtime.LaunchedEffect
@@ -92,9 +88,6 @@ fun RootScreen(
     val longPollStateToApply by longPollController.stateToApply.collectAsStateWithLifecycle()
 
             val viewModel: MainViewModel = koinViewModel<MainViewModelImpl>()
-    LaunchedEffect(viewModel) {
-        Log.d("VM_CREATE", "RootScreen(): viewModel: $viewModel")
-    }
 
     val currentUser: VkUser? by viewModel.currentUser.collectAsStateWithLifecycle()
 
@@ -126,13 +119,11 @@ fun RootScreen(
     }
 
         LifecycleResumeEffect(longPollStateToApply) {
-        Log.d("LongPollMainActivity", "longPollStateToApply: $longPollStateToApply")
         if (longPollStateToApply != LongPollState.Background) {
             if (longPollStateToApply.isLaunched() && longPollCurrentState.isLaunched()
                 && longPollCurrentState != longPollStateToApply
             ) {
                 toggleLongPollService(false, null)
-                Log.d("LongPoll", "recreate()")
             }
 
             toggleLongPollService(
@@ -241,6 +232,7 @@ fun RootScreen(
             val context = LocalContext.current
             val startDestination by viewModel.startDestination.collectAsStateWithLifecycle()
             val isNeedToOpenAuth by viewModel.isNeedToReplaceWithAuth.collectAsStateWithLifecycle()
+            val baseError by viewModel.baseError.collectAsStateWithLifecycle()
             val isNeedToShowDeniedDialog by viewModel.isNeedToShowNotificationsDeniedDialog.collectAsStateWithLifecycle()
             val isNeedToShowRationaleDialog by viewModel.isNeedToShowNotificationsRationaleDialog.collectAsStateWithLifecycle()
 
@@ -304,6 +296,12 @@ fun RootScreen(
                 )
             }
 
+            RootErrorDialog(
+                baseError = baseError,
+                onDismiss = viewModel::onErrorConsumed,
+                onConfirm = viewModel::onErrorConsumed
+            )
+
             if (startDestination != null) {
                 CompositionLocalProvider(
                     LocalNavRootController provides navController,

app/src/main/kotlin/dev/meloda/fast/service/longpolling/LongPollingService.kt

@@ -16,11 +16,17 @@ import dev.meloda.fast.common.LongPollController
 import dev.meloda.fast.common.VkConstants
 import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.model.LongPollState
+import dev.meloda.fast.data.VkMemoryCache
 import dev.meloda.fast.data.UserConfig
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.datastore.AppSettings
 import dev.meloda.fast.domain.LongPollUpdatesParser
 import dev.meloda.fast.domain.LongPollUseCase
+import dev.meloda.fast.domain.MessagesUseCase
+import dev.meloda.fast.domain.StoreUsersUseCase
+import dev.meloda.fast.model.api.data.VkGroupData
+import dev.meloda.fast.model.api.data.VkUserData
+import dev.meloda.fast.model.api.data.asDomain
 import dev.meloda.fast.model.api.data.LongPollUpdates
 import dev.meloda.fast.model.api.data.VkLongPollData
 import dev.meloda.fast.ui.R
@@ -33,6 +39,7 @@ import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.flow.last
 import org.koin.android.ext.android.inject
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.resume
@@ -55,6 +62,8 @@ class LongPollingService : Service() {
     private val coroutineScope = CoroutineScope(coroutineContext)
 
     private val longPollUseCase: LongPollUseCase by inject()
+    private val messagesUseCase: MessagesUseCase by inject()
+    private val storeUsersUseCase: StoreUsersUseCase by inject()
     private val updatesParser: LongPollUpdatesParser by inject()
 
     private var currentJob: Job? = null
@@ -150,6 +159,8 @@ class LongPollingService : Service() {
             var serverInfo = getServerInfo()
                 ?: throw LongPollException(message = "bad VK response (server info)")
 
+            syncLongPollHistory(serverInfo)
+
             var lastUpdatesResponse: LongPollUpdates? = getUpdatesResponse(serverInfo)
                 ?: throw LongPollException(message = "initiation error: bad VK response (last updates)")
 
@@ -160,6 +171,7 @@ class LongPollingService : Service() {
                     failCount++
                     serverInfo = getServerInfo()
                         ?: throw LongPollException(message = "failed retrieving server info after error: bad VK response (server info #2)")
+                    syncLongPollHistory(serverInfo)
                     lastUpdatesResponse = getUpdatesResponse(serverInfo)
                     continue
                 }
@@ -179,6 +191,7 @@ class LongPollingService : Service() {
                             ?: throw LongPollException(
                                 message = "failed retrieving server info after error: bad VK response (server info #3)"
                             )
+                        syncLongPollHistory(serverInfo)
                         lastUpdatesResponse = getUpdatesResponse(serverInfo)
                     }
 
@@ -196,6 +209,9 @@ class LongPollingService : Service() {
                                 updates.forEach(updatesParser::parseNextUpdate)
                             }
 
+                            AppSettings.LongPoll.ts = lastUpdatesResponse.ts ?: serverInfo.ts
+                            AppSettings.LongPoll.pts = lastUpdatesResponse.pts ?: AppSettings.LongPoll.pts
+
                             lastUpdatesResponse = getUpdatesResponse(serverInfo.copy(ts = newTs))
                         }
                     }
@@ -246,6 +262,73 @@ class LongPollingService : Service() {
         }
     }
 
+    private suspend fun syncLongPollHistory(serverInfo: VkLongPollData) {
+        val cursorTs = AppSettings.LongPoll.ts ?: serverInfo.ts
+        val cursorPts = AppSettings.LongPoll.pts ?: serverInfo.pts
+        val maxMsgId = messagesUseCase.getLocalMaxMessageId()
+
+        var currentTs = cursorTs
+        var currentPts = cursorPts
+        var more: Int?
+
+        do {
+            val historyResponse = getLongPollHistory(
+                ts = currentTs,
+                pts = currentPts,
+                maxMsgId = maxMsgId
+            ) ?: return
+
+            historyResponse.history.orEmpty().forEach(updatesParser::parseNextUpdate)
+
+            historyResponse.messages?.items.orEmpty().takeIf { it.isNotEmpty() }?.let { rawMessages ->
+                val messages = rawMessages.map { it.asDomain() }
+                messagesUseCase.storeMessages(messages)
+            }
+
+            historyResponse.profiles.orEmpty().takeIf { it.isNotEmpty() }?.let { profiles ->
+                val users = profiles.map(VkUserData::mapToDomain)
+                VkMemoryCache.appendUsers(users)
+                storeUsersUseCase(users).last()
+            }
+
+            historyResponse.groups.orEmpty().takeIf { it.isNotEmpty() }?.let { groups ->
+                VkMemoryCache.appendGroups(groups.map(VkGroupData::mapToDomain))
+            }
+
+            currentTs = historyResponse.ts ?: historyResponse.fromPts ?: currentTs
+            currentPts = historyResponse.newPts ?: historyResponse.pts ?: currentPts
+            more = historyResponse.more
+
+            AppSettings.LongPoll.ts = currentTs
+            AppSettings.LongPoll.pts = currentPts
+        } while (more == 1)
+    }
+
+    private suspend fun getLongPollHistory(
+        ts: Int,
+        pts: Int,
+        maxMsgId: Long?
+    ): dev.meloda.fast.model.api.data.LongPollHistoryResponse? = suspendCancellableCoroutine {
+        longPollUseCase.getLongPollHistory(
+            ts = ts,
+            pts = pts,
+            lpVersion = VkConstants.LP_VERSION,
+            maxMsgId = maxMsgId,
+            eventsLimit = 1000,
+            msgsLimit = 200
+        ).listenValue(coroutineScope) { state ->
+            state.processState(
+                success = { response ->
+                    it.resume(response)
+                },
+                error = { error ->
+                    Log.e(TAG, "getLongPollHistory: error: $error")
+                    it.resume(null)
+                }
+            )
+        }
+    }
+
     private fun handleError(throwable: Throwable) {
         Log.e(TAG, "error: $throwable")
 

app/src/main/kotlin/dev/meloda/fast/service/longpolling/di/LongPollModule.kt

@@ -1,6 +1,7 @@
 package dev.meloda.fast.service.longpolling.di
 
 import dev.meloda.fast.domain.LongPollUpdatesParser
+import dev.meloda.fast.domain.LongPollUpdatesReducer
 import dev.meloda.fast.domain.LongPollUseCase
 import dev.meloda.fast.domain.LongPollUseCaseImpl
 import org.koin.core.module.dsl.singleOf
@@ -10,4 +11,5 @@ import org.koin.dsl.module
 val longPollModule = module {
     singleOf(::LongPollUseCaseImpl) bind LongPollUseCase::class
     singleOf(::LongPollUpdatesParser)
+    singleOf(::LongPollUpdatesReducer)
 }

build-logic/convention/src/main/kotlin/dev/meloda/fast/KotlinAndroid.kt

@@ -25,6 +25,7 @@ internal fun Project.configureKotlinAndroid(
 
     commonExtension.apply {
         compileSdk = getVersionInt("compileSdk")
+        buildToolsVersion = "36.1.0"
     }
 
     configureKotlin<KotlinAndroidProjectExtension>()

core/common/src/main/kotlin/dev/meloda/fast/common/extensions/Extensions.kt

@@ -13,6 +13,7 @@ import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.onStart
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
 import kotlin.reflect.KClass
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
@@ -45,6 +46,14 @@ fun <T> Flow<T>.listenValue(
     action: suspend (T) -> Unit
 ): Job = onEach(action::invoke).launchIn(coroutineScope)
 
+fun CoroutineScope.launchDbRefresh(
+    load: suspend () -> Unit,
+    after: suspend () -> Unit
+): Job = launch {
+    load()
+    after()
+}
+
 fun createTimerFlow(
     time: Int,
     onStartAction: (suspend () -> Unit)? = null,

core/common/src/main/kotlin/dev/meloda/fast/common/paging/Paging.kt

@@ -0,0 +1,25 @@
+package dev.meloda.fast.common.paging
+
+fun canPaginate(pageSize: Int, loadedCount: Int): Boolean = loadedCount == pageSize
+
+fun isPaginationExhausted(
+    pageSize: Int,
+    loadedCount: Int,
+    hasExistingItems: Boolean
+): Boolean = loadedCount != pageSize && hasExistingItems
+
+fun <T> mergePage(
+    existing: List<T>,
+    page: List<T>,
+    offset: Int
+): List<T> = if (offset == 0) page else existing + page
+
+data class LoadingFlags(
+    val isLoading: Boolean,
+    val isPaginating: Boolean
+)
+
+fun loadingFlags(offset: Int, isLoading: Boolean): LoadingFlags = LoadingFlags(
+    isLoading = offset == 0 && isLoading,
+    isPaginating = offset > 0 && isLoading
+)

core/data/src/main/kotlin/dev/meloda/fast/data/AccessTokenInterceptor.kt

@@ -1,24 +1,18 @@
 package dev.meloda.fast.data
 
-import androidx.core.net.toUri
 import okhttp3.Interceptor
 import okhttp3.Response
-import java.net.URLEncoder
 
 class AccessTokenInterceptor : Interceptor {
 
     override fun intercept(chain: Interceptor.Chain): Response {
-        val builder = chain.request().url.newBuilder()
+        val request = chain.request()
+        val urlBuilder = request.url.newBuilder()
 
-        val uri = builder.build().toUri().toString().toUri()
+        if (request.url.queryParameter("access_token") == null) {
-
+            urlBuilder.addQueryParameter("access_token", UserConfig.accessToken)
-        if (uri.getQueryParameter("access_token") == null) {
-            builder.addQueryParameter(
-                "access_token",
-                URLEncoder.encode(UserConfig.accessToken, "utf-8")
-            )
         }
 
-        return chain.proceed(chain.request().newBuilder().apply { url(builder.build()) }.build())
+        return chain.proceed(request.newBuilder().url(urlBuilder.build()).build())
     }
 }

core/data/src/main/kotlin/dev/meloda/fast/data/UserConfig.kt

@@ -24,6 +24,9 @@ object UserConfig {
         accessToken = ""
         fastToken = ""
         userId = -1
+        trustedHash = null
+        exchangeToken = null
+        AppSettings.LongPoll.clear()
     }
 
     fun isLoggedIn(): Boolean {

core/data/src/main/kotlin/dev/meloda/fast/data/VkGroupsMap.kt

@@ -21,12 +21,10 @@ class VkGroupsMap(
         else map[abs(convo.id)]
 
     fun messageActionGroup(message: VkMessage): VkGroupDomain? =
-        if (message.actionMemberId == null || message.actionMemberId!! >= 0) null
+        message.actionMemberId?.takeIf { it < 0 }?.let { map[abs(it)] }
-        else map[abs(message.actionMemberId!!)]
 
     fun messageActionGroup(message: VkMessageData): VkGroupDomain? =
-        if (message.action?.memberId == null || message.action!!.memberId!! >= 0) null
+        message.action?.memberId?.takeIf { it < 0 }?.let { map[abs(it)] }
-        else map[abs(message.action!!.memberId!!)]
 
     fun messageGroup(message: VkMessage): VkGroupDomain? =
         if (!message.isGroup()) null

core/data/src/main/kotlin/dev/meloda/fast/data/VkMemoryCache.kt

@@ -1,6 +1,5 @@
 package dev.meloda.fast.data
 
-import dev.meloda.fast.data.UserConfig.userId
 import dev.meloda.fast.model.api.domain.VkContactDomain
 import dev.meloda.fast.model.api.domain.VkConvo
 import dev.meloda.fast.model.api.domain.VkGroupDomain
@@ -38,7 +37,15 @@ object VkMemoryCache {
         contacts.forEach { contact -> VkMemoryCache.contacts[contact.userId] = contact }
     }
 
-    operator fun set(userid: Long, user: VkUser) {
+    fun clear() {
+        users.clear()
+        groups.clear()
+        messages.clear()
+        convos.clear()
+        contacts.clear()
+    }
+
+    operator fun set(userId: Long, user: VkUser) {
         users[userId] = user
     }
 

core/data/src/main/kotlin/dev/meloda/fast/data/VkUsersMap.kt

@@ -20,12 +20,10 @@ class VkUsersMap(
         else map[convo.id]
 
     fun messageActionUser(message: VkMessage): VkUser? =
-        if (message.actionMemberId == null || message.actionMemberId!! <= 0) null
+        message.actionMemberId?.takeIf { it > 0 }?.let(map::get)
-        else map[message.actionMemberId]
 
     fun messageActionUser(message: VkMessageData): VkUser? =
-        if (message.action?.memberId == null || message.action!!.memberId!! <= 0) null
+        message.action?.memberId?.takeIf { it > 0 }?.let(map::get)
-        else map[message.action!!.memberId]
 
     fun messageUser(message: VkMessage): VkUser? =
         if (!message.isUser()) null

core/data/src/main/kotlin/dev/meloda/fast/data/api/convos/ConvosRepository.kt

@@ -8,6 +8,9 @@ import dev.meloda.fast.network.RestApiErrorDomain
 interface ConvosRepository {
 
     suspend fun storeConvos(convos: List<VkConvo>)
+    suspend fun getLocalConvos(): List<VkConvo>
+    suspend fun getLocalConvoById(peerId: Long): VkConvo?
+    suspend fun deleteLocalConvo(peerId: Long)
 
     suspend fun getConvos(
         count: Int?,

core/data/src/main/kotlin/dev/meloda/fast/data/api/convos/ConvosRepositoryImpl.kt

@@ -19,11 +19,13 @@ import dev.meloda.fast.model.api.domain.VkGroupDomain
 import dev.meloda.fast.model.api.domain.VkMessage
 import dev.meloda.fast.model.api.domain.VkUser
 import dev.meloda.fast.model.api.domain.asEntity
+import dev.meloda.fast.model.database.VkConvoEntity
 import dev.meloda.fast.model.api.requests.ConvosGetRequest
 import dev.meloda.fast.network.RestApiErrorDomain
 import dev.meloda.fast.network.mapApiDefault
 import dev.meloda.fast.network.mapApiResult
 import dev.meloda.fast.network.service.convos.ConvosService
+import dev.meloda.fast.model.database.asExternalModel
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -40,6 +42,28 @@ class ConvosRepositoryImpl(
         convoDao.insertAll(convos.map(VkConvo::asEntity))
     }
 
+    override suspend fun getLocalConvos(): List<VkConvo> = withContext(Dispatchers.IO) {
+        convoDao.getAllWithMessage().map { convoWithMessage ->
+            convoWithMessage.convo.asExternalModel().copy(
+                lastMessage = convoWithMessage.message?.asExternalModel()
+            )
+        }.sorted()
+    }
+
+    override suspend fun getLocalConvoById(peerId: Long): VkConvo? = withContext(Dispatchers.IO) {
+        convoDao.getByIdWithMessage(peerId)?.let { convoWithMessage ->
+            convoWithMessage.convo.asExternalModel().copy(
+                lastMessage = convoWithMessage.message?.asExternalModel()
+            )
+        }
+    }
+
+    override suspend fun deleteLocalConvo(peerId: Long) {
+        withContext(Dispatchers.IO) {
+            convoDao.deleteById(peerId)
+        }
+    }
+
     override suspend fun getConvos(
         count: Int?,
         offset: Int?,
@@ -198,4 +222,28 @@ class ConvosRepositoryImpl(
     ): ApiResult<Int, RestApiErrorDomain> = withContext(Dispatchers.IO) {
         convosService.unarchive(mapOf("peer_id" to peerId.toString())).mapApiDefault()
     }
+
+    private fun List<VkConvo>.sorted(): List<VkConvo> {
+        val newConvos = toMutableList()
+
+        val pinnedConvos = newConvos
+            .filter(VkConvo::isPinned)
+            .sortedWith { c1, c2 ->
+                val diff = c2.majorId - c1.majorId
+
+                if (diff == 0) {
+                    c2.minorId - c1.minorId
+                } else {
+                    diff
+                }
+            }
+
+        newConvos.removeAll(pinnedConvos)
+        newConvos.sortWith { c1, c2 ->
+            (c2.lastMessage?.date ?: 0) - (c1.lastMessage?.date ?: 0)
+        }
+
+        newConvos.addAll(0, pinnedConvos)
+        return newConvos
+    }
 }

core/data/src/main/kotlin/dev/meloda/fast/data/api/longpoll/LongPollRepository.kt

@@ -1,6 +1,7 @@
 package dev.meloda.fast.data.api.longpoll
 
 import dev.meloda.fast.model.api.data.LongPollUpdates
+import dev.meloda.fast.model.api.data.LongPollHistoryResponse
 import dev.meloda.fast.model.api.data.VkLongPollData
 import dev.meloda.fast.network.RestApiErrorDomain
 import com.slack.eithernet.ApiResult
@@ -21,4 +22,14 @@ interface LongPollRepository {
         mode: Int,
         version: Int
     ): ApiResult<LongPollUpdates, RestApiErrorDomain>
+
+    suspend fun getLongPollHistory(
+        ts: Int,
+        pts: Int,
+        lpVersion: Int,
+        lastN: Int? = null,
+        maxMsgId: Long? = null,
+        eventsLimit: Int? = null,
+        msgsLimit: Int? = null
+    ): ApiResult<LongPollHistoryResponse, RestApiErrorDomain>
 }

core/data/src/main/kotlin/dev/meloda/fast/data/api/longpoll/LongPollRepositoryImpl.kt

@@ -1,7 +1,9 @@
 package dev.meloda.fast.data.api.longpoll
 
 import dev.meloda.fast.model.api.data.LongPollUpdates
+import dev.meloda.fast.model.api.data.LongPollHistoryResponse
 import dev.meloda.fast.model.api.data.VkLongPollData
+import dev.meloda.fast.model.api.requests.LongPollGetHistoryRequest
 import dev.meloda.fast.model.api.requests.LongPollGetUpdatesRequest
 import dev.meloda.fast.model.api.requests.MessagesGetLongPollServerRequest
 import dev.meloda.fast.network.RestApiErrorDomain
@@ -52,4 +54,29 @@ class LongPollRepositoryImpl(
 
         longPollService.getResponse(serverUrl, requestModel.map).mapDefault()
     }
+
+    override suspend fun getLongPollHistory(
+        ts: Int,
+        pts: Int,
+        lpVersion: Int,
+        lastN: Int?,
+        maxMsgId: Long?,
+        eventsLimit: Int?,
+        msgsLimit: Int?
+    ): ApiResult<LongPollHistoryResponse, RestApiErrorDomain> = withContext(Dispatchers.IO) {
+        val requestModel = LongPollGetHistoryRequest(
+            ts = ts,
+            pts = pts,
+            lpVersion = lpVersion,
+            lastN = lastN,
+            maxMsgId = maxMsgId,
+            eventsLimit = eventsLimit,
+            msgsLimit = msgsLimit
+        )
+
+        messagesService.getLongPollHistory(requestModel.map).mapApiResult(
+            successMapper = { response -> response.requireResponse() },
+            errorMapper = { error -> error?.toDomain() }
+        )
+    }
 }

core/data/src/main/kotlin/dev/meloda/fast/data/api/messages/MessagesRepository.kt

@@ -14,6 +14,12 @@ interface MessagesRepository {
 
     suspend fun storeMessages(messages: List<VkMessage>)
 
+    suspend fun getLocalMessages(convoId: Long): List<VkMessage>
+    suspend fun getLocalMessageById(messageId: Long): VkMessage?
+    suspend fun getLocalMessageByConvoMessageId(convoId: Long, cmId: Long): VkMessage?
+    suspend fun getLocalMaxMessageId(): Long?
+    suspend fun deleteLocalMessages(messageIds: List<Long>)
+
     suspend fun getHistory(
         convoId: Long,
         offset: Int?,

core/data/src/main/kotlin/dev/meloda/fast/data/api/messages/MessagesRepositoryImpl.kt

@@ -22,6 +22,7 @@ import dev.meloda.fast.model.api.domain.VkGroupDomain
 import dev.meloda.fast.model.api.domain.VkMessage
 import dev.meloda.fast.model.api.domain.VkUser
 import dev.meloda.fast.model.api.domain.asEntity
+import dev.meloda.fast.model.database.VkMessageEntity
 import dev.meloda.fast.model.api.requests.MessagesCreateChatRequest
 import dev.meloda.fast.model.api.requests.MessagesDeleteRequest
 import dev.meloda.fast.model.api.requests.MessagesEditRequest
@@ -39,6 +40,7 @@ import dev.meloda.fast.model.api.requests.MessagesUnpinMessageRequest
 import dev.meloda.fast.model.api.responses.MessagesGetConvoMembersResponse
 import dev.meloda.fast.model.api.responses.MessagesGetReadPeersResponse
 import dev.meloda.fast.model.api.responses.MessagesSendResponse
+import dev.meloda.fast.model.database.asExternalModel
 import dev.meloda.fast.network.RestApiErrorDomain
 import dev.meloda.fast.network.mapApiDefault
 import dev.meloda.fast.network.mapApiResult
@@ -354,6 +356,28 @@ class MessagesRepositoryImpl(
         messageDao.insertAll(messages.map(VkMessage::asEntity))
     }
 
+    override suspend fun getLocalMessages(convoId: Long): List<VkMessage> = withContext(Dispatchers.IO) {
+        messageDao.getAll(convoId).map(VkMessageEntity::asExternalModel)
+    }
+
+    override suspend fun getLocalMessageById(messageId: Long): VkMessage? = withContext(Dispatchers.IO) {
+        messageDao.getById(messageId)?.asExternalModel()
+    }
+
+    override suspend fun getLocalMessageByConvoMessageId(convoId: Long, cmId: Long): VkMessage? = withContext(Dispatchers.IO) {
+        messageDao.getByConvoMessageId(convoId, cmId)?.asExternalModel()
+    }
+
+    override suspend fun getLocalMaxMessageId(): Long? = withContext(Dispatchers.IO) {
+        messageDao.getMaxId()
+    }
+
+    override suspend fun deleteLocalMessages(messageIds: List<Long>) {
+        withContext(Dispatchers.IO) {
+            messageDao.deleteByIds(messageIds)
+        }
+    }
+
     override suspend fun edit(
         peerId: Long,
         messageId: Long?,

core/database/src/main/kotlin/dev/meloda/fast/database/dao/ConvoDao.kt

@@ -9,9 +9,13 @@ import dev.meloda.fast.model.database.VkConvoEntity
 @Dao
 abstract class ConvoDao : EntityDao<VkConvoEntity> {
 
-    @Query("SELECT * FROM convos")
+    @Query("SELECT * FROM convos ORDER BY majorId DESC, minorId DESC")
     abstract suspend fun getAll(): List<VkConvoEntity>
 
+    @Transaction
+    @Query("SELECT * FROM convos ORDER BY majorId DESC, minorId DESC")
+    abstract suspend fun getAllWithMessage(): List<ConvoWithMessage>
+
     @Query("SELECT * FROM convos WHERE id IN (:ids)")
     abstract suspend fun getAllByIds(ids: List<Int>): List<VkConvoEntity>
 
@@ -22,6 +26,9 @@ abstract class ConvoDao : EntityDao<VkConvoEntity> {
     @Query("SELECT * FROM convos WHERE id IS (:id)")
     abstract suspend fun getByIdWithMessage(id: Long): ConvoWithMessage?
 
+    @Query("DELETE FROM convos WHERE id IS (:id)")
+    abstract suspend fun deleteById(id: Long): Int
+
     @Query("DELETE FROM convos WHERE rowid IN (:ids)")
     abstract suspend fun deleteByIds(ids: List<Int>): Int
 }

core/database/src/main/kotlin/dev/meloda/fast/database/dao/MessageDao.kt

@@ -10,15 +10,21 @@ abstract class MessageDao : EntityDao<VkMessageEntity> {
     @Query("SELECT * FROM messages")
     abstract suspend fun getAll(): List<VkMessageEntity>
 
-    @Query("SELECT * FROM messages WHERE peerId IS (:convoId)")
+    @Query("SELECT * FROM messages WHERE peerId IS (:convoId) ORDER BY date DESC, id DESC")
     abstract suspend fun getAll(convoId: Long): List<VkMessageEntity>
 
     @Query("SELECT * FROM messages WHERE id IN (:ids)")
-    abstract suspend fun getAllByIds(ids: List<Int>): List<VkMessageEntity>
+    abstract suspend fun getAllByIds(ids: List<Long>): List<VkMessageEntity>
 
     @Query("SELECT * FROM messages WHERE id IS (:messageId)")
     abstract suspend fun getById(messageId: Long): VkMessageEntity?
 
+    @Query("SELECT * FROM messages WHERE peerId IS (:convoId) AND cmId IS (:cmId)")
+    abstract suspend fun getByConvoMessageId(convoId: Long, cmId: Long): VkMessageEntity?
+
+    @Query("SELECT MAX(id) FROM messages")
+    abstract suspend fun getMaxId(): Long?
+
     @Query("DELETE FROM messages WHERE id IN (:ids)")
-    abstract suspend fun deleteByIds(ids: List<Int>): Int
+    abstract suspend fun deleteByIds(ids: List<Long>): Int
 }

core/datastore/src/main/kotlin/dev/meloda/fast/datastore/AppSettings.kt

@@ -230,6 +230,21 @@ object AppSettings {
             set(value) = put(SettingsKeys.KEY_MORE_ANIMATIONS, value)
     }
 
+    object LongPoll {
+        var ts: Int?
+            get() = get(SettingsKeys.KEY_LONG_POLL_TS, 0).takeIf { it > 0 }
+            set(value) = put(SettingsKeys.KEY_LONG_POLL_TS, value ?: 0)
+
+        var pts: Int?
+            get() = get(SettingsKeys.KEY_LONG_POLL_PTS, 0).takeIf { it > 0 }
+            set(value) = put(SettingsKeys.KEY_LONG_POLL_PTS, value ?: 0)
+
+        fun clear() {
+            ts = null
+            pts = null
+        }
+    }
+
     object Debug {
         var showAlertAfterCrash: Boolean
             get() = get(

core/datastore/src/main/kotlin/dev/meloda/fast/datastore/SettingsKeys.kt

@@ -39,6 +39,8 @@ object SettingsKeys {
     const val DEFAULT_VALUE_FEATURES_FAST_TEXT = "¯\\_(ツ)_/¯"
     const val KEY_LONG_POLL_IN_BACKGROUND = "lp_background"
     const val DEFAULT_LONG_POLL_IN_BACKGROUND = false
+    const val KEY_LONG_POLL_TS = "lp_ts"
+    const val KEY_LONG_POLL_PTS = "lp_pts"
 
     const val KEY_ACTIVITY_SEND_ONLINE_STATUS = "activity_send_online_status"
     const val DEFAULT_VALUE_KEY_ACTIVITY_SEND_ONLINE_STATUS = false

core/domain/src/main/kotlin/dev/meloda/fast/domain/ConvoUseCase.kt

@@ -8,6 +8,9 @@ import kotlinx.coroutines.flow.Flow
 interface ConvoUseCase : BaseUseCase {
 
     suspend fun storeConvos(convos: List<VkConvo>)
+    suspend fun getLocalConvos(): List<VkConvo>
+    suspend fun getLocalConvoById(peerId: Long): VkConvo?
+    suspend fun deleteLocalConvo(peerId: Long)
 
     fun getConvos(
         count: Int? = null,

core/domain/src/main/kotlin/dev/meloda/fast/domain/ConvoUseCaseImpl.kt

@@ -19,6 +19,18 @@ class ConvoUseCaseImpl(
         repository.storeConvos(convos)
     }
 
+    override suspend fun getLocalConvos(): List<VkConvo> = withContext(Dispatchers.IO) {
+        repository.getLocalConvos()
+    }
+
+    override suspend fun getLocalConvoById(peerId: Long): VkConvo? = withContext(Dispatchers.IO) {
+        repository.getLocalConvoById(peerId)
+    }
+
+    override suspend fun deleteLocalConvo(peerId: Long) = withContext(Dispatchers.IO) {
+        repository.deleteLocalConvo(peerId)
+    }
+
     override fun getConvos(
         count: Int?,
         offset: Int?,

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollEventDispatcher.kt

@@ -0,0 +1,36 @@
+package dev.meloda.fast.domain
+
+import dev.meloda.fast.model.LongPollEvent
+import dev.meloda.fast.model.LongPollParsedEvent
+
+internal class LongPollEventDispatcher {
+    private val listenersMap: MutableMap<LongPollEvent, MutableList<VkEventCallback<LongPollParsedEvent>>> =
+        mutableMapOf()
+
+    @Suppress("UNCHECKED_CAST")
+    fun <T : LongPollParsedEvent> dispatch(eventType: LongPollEvent, event: T) {
+        listenersMap[eventType]?.forEach { callback ->
+            (callback as? VkEventCallback<T>)?.onEvent(event)
+        }
+    }
+
+    fun dispatchAll(eventType: LongPollEvent, events: List<LongPollParsedEvent>) {
+        events.forEach { event -> dispatch(eventType, event) }
+    }
+
+    @Suppress("UNCHECKED_CAST")
+    fun <T : LongPollParsedEvent> registerListener(
+        eventType: LongPollEvent,
+        listener: VkEventCallback<T>
+    ) {
+        listenersMap[eventType] = (listenersMap[eventType] ?: mutableListOf())
+            .also { it.add(listener as VkEventCallback<LongPollParsedEvent>) }
+    }
+
+    fun <T : LongPollParsedEvent> registerListeners(
+        eventTypes: List<LongPollEvent>,
+        listener: VkEventCallback<T>
+    ) {
+        eventTypes.forEach { eventType -> registerListener(eventType, listener) }
+    }
+}

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollEventParser.kt

@@ -0,0 +1,537 @@
+package dev.meloda.fast.domain
+
+import android.util.Log
+import dev.meloda.fast.common.VkConstants
+import dev.meloda.fast.common.extensions.asInt
+import dev.meloda.fast.common.extensions.asLong
+import dev.meloda.fast.common.extensions.listenValue
+import dev.meloda.fast.common.extensions.toList
+import dev.meloda.fast.data.UserConfig
+import dev.meloda.fast.data.processState
+import dev.meloda.fast.model.ApiEvent
+import dev.meloda.fast.model.ConvoFlags
+import dev.meloda.fast.model.InteractionType
+import dev.meloda.fast.model.LongPollEvent
+import dev.meloda.fast.model.LongPollParsedEvent
+import dev.meloda.fast.model.MessageFlags
+import dev.meloda.fast.model.api.domain.VkConvo
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+
+internal class LongPollEventParser(
+    private val coroutineScope: CoroutineScope,
+    private val convoUseCase: ConvoUseCase,
+    private val messagesUseCase: MessagesUseCase,
+    private val dispatch: (LongPollEvent, LongPollParsedEvent) -> Unit,
+    private val dispatchAll: (LongPollEvent, List<LongPollParsedEvent>) -> Unit
+) {
+    fun parseNextUpdate(event: List<Any>) {
+        val eventId = event.first().asInt()
+
+        when (val eventType = ApiEvent.parseOrNull(eventId)) {
+            null -> Unit
+
+            ApiEvent.MESSAGE_SET_FLAGS -> parseMessageSetFlags(eventType, event)
+            ApiEvent.MESSAGE_CLEAR_FLAGS -> parseMessageClearFlags(eventType, event)
+            ApiEvent.MESSAGE_NEW -> parseMessageNew(eventType, event)
+            ApiEvent.MESSAGE_EDIT -> parseMessageEdit(eventType, event)
+            ApiEvent.MESSAGE_READ_INCOMING -> parseMessageReadIncoming(eventType, event)
+            ApiEvent.MESSAGE_READ_OUTGOING -> parseMessageReadOutgoing(eventType, event)
+            ApiEvent.CHAT_CLEAR_FLAGS -> parseChatClearFlags(eventType, event)
+            ApiEvent.CHAT_SET_FLAGS -> parseChatSetFlags(eventType, event)
+            ApiEvent.MESSAGES_DELETED -> parseMessagesDeleted(eventType, event)
+            ApiEvent.CHAT_MAJOR_CHANGED -> parseChatMajorChanged(eventType, event)
+            ApiEvent.CHAT_MINOR_CHANGED -> parseChatMinorChanged(eventType, event)
+
+            ApiEvent.TYPING,
+            ApiEvent.AUDIO_MESSAGE_RECORDING,
+            ApiEvent.PHOTO_UPLOADING,
+            ApiEvent.VIDEO_UPLOADING,
+            ApiEvent.FILE_UPLOADING -> parseInteraction(eventType, event)
+
+            ApiEvent.UNREAD_COUNT_UPDATE -> parseUnreadCounterUpdate(eventType, event)
+            ApiEvent.MESSAGE_UPDATED -> parseMessageUpdated(eventType, event)
+            ApiEvent.MESSAGE_CACHE_CLEAR -> parseMessageCacheClear(eventType, event)
+        }
+    }
+
+    private fun parseMessageSetFlags(eventType: ApiEvent, event: List<Any>) {
+        val cmId = event[1].asLong()
+        val flags = event[2].asInt()
+        val peerId = event[3].asLong()
+
+        val eventsToSend = mutableListOf<LongPollParsedEvent>()
+
+        val parsedFlags = MessageFlags.parse(flags)
+        parsedFlags.forEach { flag ->
+            when (flag) {
+                MessageFlags.IMPORTANT -> {
+                    val eventToSend = LongPollParsedEvent.MessageMarkedAsImportant(
+                        peerId = peerId,
+                        cmId = cmId,
+                        marked = true
+                    )
+                    eventsToSend += eventToSend
+                    dispatch(LongPollEvent.MARKED_AS_IMPORTANT, eventToSend)
+                }
+
+                MessageFlags.SPAM -> {
+                    val eventToSend = LongPollParsedEvent.MessageMarkedAsSpam(
+                        peerId = peerId,
+                        cmId = cmId
+                    )
+                    eventsToSend += eventToSend
+                    dispatch(LongPollEvent.MARKED_AS_SPAM, eventToSend)
+                }
+
+                MessageFlags.DELETED -> {
+                    val eventToSend =
+                        if (parsedFlags.contains(MessageFlags.DELETED_FOR_ALL)) {
+                            LongPollParsedEvent.MessageDeleted(
+                                peerId = peerId,
+                                cmId = cmId,
+                                forAll = true
+                            )
+                        } else {
+                            LongPollParsedEvent.MessageDeleted(
+                                peerId = peerId,
+                                cmId = cmId,
+                                forAll = false
+                            )
+                        }
+                    eventsToSend += eventToSend
+                    dispatch(LongPollEvent.MESSAGE_DELETED, eventToSend)
+                }
+
+                MessageFlags.AUDIO_LISTENED -> {
+                    val eventToSend = LongPollParsedEvent.AudioMessageListened(
+                        peerId = peerId,
+                        cmId = cmId
+                    )
+                    eventsToSend += eventToSend
+                    dispatch(LongPollEvent.AUDIO_MESSAGE_LISTENED, eventToSend)
+                }
+
+                else -> Unit
+            }
+        }
+
+        dispatchAll(LongPollEvent.MESSAGE_SET_FLAGS, eventsToSend)
+    }
+
+    private fun parseMessageClearFlags(eventType: ApiEvent, event: List<Any>) {
+        val cmId = event[1].asLong()
+        val flags = event[2].asInt()
+        val peerId = event[3].asLong()
+
+        val eventsToSend = mutableListOf<LongPollParsedEvent>()
+
+        val parsedFlags = MessageFlags.parse(flags)
+
+        coroutineScope.launch {
+            parsedFlags.forEach { flag ->
+                when (flag) {
+                    MessageFlags.IMPORTANT -> {
+                        val eventToSend = LongPollParsedEvent.MessageMarkedAsImportant(
+                            peerId = peerId,
+                            cmId = cmId,
+                            marked = false
+                        )
+                        eventsToSend += eventToSend
+                        dispatch(LongPollEvent.MARKED_AS_IMPORTANT, eventToSend)
+                    }
+
+                    MessageFlags.SPAM -> {
+                        if (parsedFlags.contains(MessageFlags.CANCEL_SPAM)) {
+                            withContext(Dispatchers.IO) {
+                                val message = loadMessage(
+                                    peerId = peerId,
+                                    cmId = cmId
+                                )
+                                message?.let {
+                                    val eventToSend =
+                                        LongPollParsedEvent.MessageMarkedAsNotSpam(message = message)
+                                    eventsToSend += eventToSend
+                                    dispatch(LongPollEvent.MARKED_AS_NOT_SPAM, eventToSend)
+                                }
+                            }
+                        }
+                    }
+
+                    MessageFlags.DELETED -> {
+                        withContext(Dispatchers.IO) {
+                            val message = loadMessage(
+                                peerId = peerId,
+                                cmId = cmId
+                            )
+                            message?.let {
+                                val eventToSend =
+                                    LongPollParsedEvent.MessageRestored(message = message)
+                                eventsToSend += eventToSend
+                                dispatch(LongPollEvent.MESSAGE_RESTORED, eventToSend)
+                            }
+                        }
+                    }
+
+                    else -> Unit
+                }
+            }
+
+            dispatchAll(LongPollEvent.MESSAGE_CLEAR_FLAGS, eventsToSend)
+        }
+    }
+
+    private fun parseMessageNew(eventType: ApiEvent, event: List<Any>) {
+        val cmId = event[1].asLong()
+        val peerId = event[4].asLong()
+
+        coroutineScope.launch(Dispatchers.IO) {
+            val message =
+                async { loadMessage(peerId = peerId, cmId = cmId) }.await()
+
+            val convo =
+                async {
+                    loadConvo(
+                        peerId = peerId,
+                        extended = true,
+                        fields = VkConstants.ALL_FIELDS
+                    )
+                }.await()
+
+            message?.let {
+                dispatch(
+                    LongPollEvent.MESSAGE_NEW,
+                    LongPollParsedEvent.NewMessage(
+                        message = message,
+                        inArchive = convo?.isArchived == true
+                    )
+                )
+            }
+        }
+    }
+
+    private fun parseMessageEdit(eventType: ApiEvent, event: List<Any>) {
+        val cmId = event[1].asLong()
+        val peerId = event[3].asLong()
+
+        coroutineScope.launch(Dispatchers.IO) {
+            loadMessage(
+                peerId = peerId,
+                cmId = cmId
+            )?.let { message ->
+                dispatch(LongPollEvent.MESSAGE_EDITED, LongPollParsedEvent.MessageEdited(message))
+            }
+        }
+    }
+
+    private fun parseMessageReadIncoming(eventType: ApiEvent, event: List<Any>) {
+        dispatchMessageRead(
+            longPollEvent = LongPollEvent.INCOMING_MESSAGE_READ,
+            parsedEvent = LongPollParsedEvent.IncomingMessageRead(
+                peerId = event[1].asLong(),
+                cmId = event[2].asLong(),
+                unreadCount = event[3].asInt()
+            )
+        )
+    }
+
+    private fun parseMessageReadOutgoing(eventType: ApiEvent, event: List<Any>) {
+        dispatchMessageRead(
+            longPollEvent = LongPollEvent.OUTGOING_MESSAGE_READ,
+            parsedEvent = LongPollParsedEvent.OutgoingMessageRead(
+                peerId = event[1].asLong(),
+                cmId = event[2].asLong(),
+                unreadCount = event[3].asInt()
+            )
+        )
+    }
+
+    private fun parseChatClearFlags(eventType: ApiEvent, event: List<Any>) {
+        val peerId = event[1].asLong()
+        val flags = event[2].asInt()
+
+        val eventsToSend = mutableListOf<LongPollParsedEvent>()
+
+        val parsedFlags = ConvoFlags.parse(flags)
+
+        coroutineScope.launch(Dispatchers.IO) {
+            parsedFlags.forEach { flag ->
+                when (flag) {
+                    ConvoFlags.ARCHIVED -> {
+                        handleArchivedChat(
+                            peerId = peerId,
+                            archived = false,
+                            eventsToSend = eventsToSend
+                        )
+                    }
+
+                    else -> Unit
+                }
+            }
+
+            dispatchAll(LongPollEvent.CHAT_CLEAR_FLAGS, eventsToSend)
+        }
+    }
+
+    private fun parseChatSetFlags(eventType: ApiEvent, event: List<Any>) {
+        val peerId = event[1].asLong()
+        val flags = event[2].asInt()
+
+        val eventsToSend = mutableListOf<LongPollParsedEvent>()
+
+        val parsedFlags = ConvoFlags.parse(flags)
+
+        coroutineScope.launch(Dispatchers.IO) {
+            parsedFlags.forEach { flag ->
+                when (flag) {
+                    ConvoFlags.ARCHIVED -> {
+                        handleArchivedChat(
+                            peerId = peerId,
+                            archived = true,
+                            eventsToSend = eventsToSend
+                        )
+                    }
+
+                    else -> Unit
+                }
+            }
+
+            dispatchAll(LongPollEvent.CHAT_SET_FLAGS, eventsToSend)
+        }
+    }
+
+    private fun parseMessagesDeleted(eventType: ApiEvent, event: List<Any>) {
+        val peerId = event[1].asLong()
+        val cmId = event[2].asLong()
+
+        dispatch(
+            LongPollEvent.CHAT_CLEARED,
+            LongPollParsedEvent.ChatCleared(
+                peerId = peerId,
+                toCmId = cmId
+            )
+        )
+    }
+
+    private fun parseChatMajorChanged(eventType: ApiEvent, event: List<Any>) {
+        val peerId = event[1].asLong()
+        val majorId = event[2].asInt()
+
+        dispatch(
+            LongPollEvent.CHAT_MAJOR_CHANGED,
+            LongPollParsedEvent.ChatMajorChanged(
+                peerId = peerId,
+                majorId = majorId,
+            )
+        )
+    }
+
+    private fun parseChatMinorChanged(eventType: ApiEvent, event: List<Any>) {
+        val peerId = event[1].asLong()
+        val minorId = event[2].asInt()
+
+        dispatch(
+            LongPollEvent.CHAT_MINOR_CHANGED,
+            LongPollParsedEvent.ChatMinorChanged(
+                peerId = peerId,
+                minorId = minorId,
+            )
+        )
+    }
+
+    private fun parseInteraction(eventType: ApiEvent, event: List<Any>) {
+        val interactionType = when (eventType) {
+            ApiEvent.TYPING -> InteractionType.Typing
+            ApiEvent.AUDIO_MESSAGE_RECORDING -> InteractionType.VoiceMessage
+            ApiEvent.PHOTO_UPLOADING -> InteractionType.Photo
+            ApiEvent.VIDEO_UPLOADING -> InteractionType.Video
+            ApiEvent.FILE_UPLOADING -> InteractionType.File
+            else -> return
+        }
+
+        val longPollEvent: LongPollEvent = when (eventType) {
+            ApiEvent.TYPING -> LongPollEvent.TYPING
+            ApiEvent.AUDIO_MESSAGE_RECORDING -> LongPollEvent.AUDIO_MESSAGE_RECORDING
+            ApiEvent.PHOTO_UPLOADING -> LongPollEvent.PHOTO_UPLOADING
+            ApiEvent.VIDEO_UPLOADING -> LongPollEvent.VIDEO_UPLOADING
+            ApiEvent.FILE_UPLOADING -> LongPollEvent.FILE_UPLOADING
+            else -> return
+        }
+
+        val peerId = event[1].asLong()
+        val userIds = event[2].toList(Any::asLong).filter { it != UserConfig.userId }
+        val totalCount = event[3].asInt()
+        val timestamp = event[4].asInt()
+
+        if (userIds.isEmpty()) return
+
+        dispatch(
+            longPollEvent,
+            LongPollParsedEvent.Interaction(
+                interactionType = interactionType,
+                peerId = peerId,
+                userIds = userIds,
+                totalCount = totalCount,
+                timestamp = timestamp
+            )
+        )
+    }
+
+    private fun parseUnreadCounterUpdate(eventType: ApiEvent, event: List<Any>) {
+        val unreadCount = event[1].asInt()
+        val unreadUnmutedCount = event[2].asInt()
+        val showOnlyMuted = event[3].asInt() == 1
+        val businessNotifyUnreadCount = event[4].asInt()
+        val archiveUnreadCount = event[7].asInt()
+        val archiveUnreadUnmutedCount = event[8].asInt()
+        val archiveMentionsCount = event[9].asInt()
+
+        dispatch(
+            LongPollEvent.UNREAD_COUNTER_UPDATE,
+            LongPollParsedEvent.UnreadCounter(
+                unread = unreadCount,
+                unreadUnmuted = unreadUnmutedCount,
+                showOnlyMuted = showOnlyMuted,
+                business = businessNotifyUnreadCount,
+                archive = archiveUnreadCount,
+                archiveUnmuted = archiveUnreadUnmutedCount,
+                archiveMentions = archiveMentionsCount
+            )
+        )
+    }
+
+    private fun parseMessageUpdated(eventType: ApiEvent, event: List<Any>) {
+        val cmId = event[1].asLong()
+        val peerId = event[4].asLong()
+
+        coroutineScope.launch(Dispatchers.IO) {
+            loadMessage(
+                peerId = peerId,
+                cmId = cmId
+            )?.let { message ->
+                dispatch(LongPollEvent.MESSAGE_UPDATED, LongPollParsedEvent.MessageUpdated(message))
+            }
+        }
+    }
+
+    private fun parseMessageCacheClear(eventType: ApiEvent, event: List<Any>) {
+        val messageId = event[1].asLong()
+
+        coroutineScope.launch(Dispatchers.IO) {
+            loadMessage(messageId = messageId)?.let { message ->
+                dispatch(
+                    LongPollEvent.MESSAGE_CACHE_CLEAR,
+                    LongPollParsedEvent.MessageCacheClear(message)
+                )
+            }
+        }
+    }
+
+    private suspend fun loadMessage(
+        peerId: Long? = null,
+        cmId: Long? = null,
+        messageId: Long? = null
+    ): VkMessage? = suspendCancellableCoroutine { continuation ->
+        require((peerId != null && cmId != null) || messageId != null)
+
+        val job = coroutineScope.launch(Dispatchers.IO) {
+            messagesUseCase.getById(
+                peerCmIds = null,
+                peerId = peerId,
+                messageIds = messageId?.let(::listOf),
+                cmIds = cmId?.let(::listOf),
+                extended = true,
+                fields = VkConstants.ALL_FIELDS
+            ).listenValue(this) { state ->
+                state.processState(
+                    error = { error ->
+                        Log.e("LongPollEventParser", "loadMessage: error: $error")
+                        continuation.resume(null)
+                    },
+                    success = { response ->
+                        val message = response.singleOrNull() ?: run {
+                            continuation.resume(null)
+                            return@listenValue
+                        }
+
+                        continuation.resume(message)
+                    }
+                )
+            }
+        }
+
+        continuation.invokeOnCancellation {
+            job.cancel()
+        }
+    }
+
+    private suspend fun loadConvo(
+        peerId: Long,
+        extended: Boolean = false,
+        fields: String? = null
+    ): VkConvo? = suspendCancellableCoroutine { continuation ->
+        val job = coroutineScope.launch(Dispatchers.IO) {
+            convoUseCase.getById(
+                peerIds = listOf(peerId),
+                extended = extended,
+                fields = fields
+            ).listenValue(coroutineScope) { state ->
+                state.processState(
+                    error = { error ->
+                        Log.e("LongPollEventParser", "loadConvo: error: $error")
+                        continuation.resume(null)
+                    },
+                    success = { response ->
+                        val convo = response.singleOrNull() ?: run {
+                            continuation.resume(null)
+                            return@listenValue
+                        }
+
+                        continuation.resume(convo)
+                    }
+                )
+            }
+        }
+
+        continuation.invokeOnCancellation {
+            job.cancel()
+        }
+    }
+
+    private suspend fun handleArchivedChat(
+        peerId: Long,
+        archived: Boolean,
+        eventsToSend: MutableList<LongPollParsedEvent>
+    ) {
+        val convo = loadConvo(
+            peerId = peerId,
+            extended = true,
+            fields = VkConstants.ALL_FIELDS
+        ) ?: return
+
+        val message = loadMessage(
+            peerId = peerId,
+            cmId = convo.lastCmId
+        )
+
+        val eventToSend = LongPollParsedEvent.ChatArchived(
+            convo = convo.copy(lastMessage = message),
+            archived = archived
+        )
+        eventsToSend += eventToSend
+        dispatch(LongPollEvent.CHAT_ARCHIVED, eventToSend)
+    }
+
+    private fun dispatchMessageRead(
+        longPollEvent: LongPollEvent,
+        parsedEvent: LongPollParsedEvent
+    ) {
+        dispatch(longPollEvent, parsedEvent)
+    }
+}

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollUpdatesParser.kt

@@ -1,35 +1,17 @@
 package dev.meloda.fast.domain
 
 import android.util.Log
-import dev.meloda.fast.common.VkConstants
-import dev.meloda.fast.common.extensions.asInt
-import dev.meloda.fast.common.extensions.asLong
-import dev.meloda.fast.common.extensions.listenValue
-import dev.meloda.fast.common.extensions.toList
-import dev.meloda.fast.data.UserConfig
-import dev.meloda.fast.data.processState
-import dev.meloda.fast.model.ApiEvent
-import dev.meloda.fast.model.ConvoFlags
-import dev.meloda.fast.model.InteractionType
 import dev.meloda.fast.model.LongPollEvent
 import dev.meloda.fast.model.LongPollParsedEvent
-import dev.meloda.fast.model.MessageFlags
-import dev.meloda.fast.model.api.domain.VkConvo
-import dev.meloda.fast.model.api.domain.VkMessage
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.async
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import kotlin.coroutines.CoroutineContext
-import kotlin.coroutines.resume
-import kotlin.coroutines.suspendCoroutine
 
 class LongPollUpdatesParser(
-    private val convoUseCase: ConvoUseCase,
+    convoUseCase: ConvoUseCase,
-    private val messagesUseCase: MessagesUseCase
+    messagesUseCase: MessagesUseCase
 ) {
     private val job = SupervisorJob()
 
@@ -43,747 +25,89 @@ class LongPollUpdatesParser(
         get() = Dispatchers.Default + job + exceptionHandler
 
     private val coroutineScope = CoroutineScope(coroutineContext)
-
+    private val eventDispatcher = LongPollEventDispatcher()
-    private val listenersMap: MutableMap<LongPollEvent, MutableList<VkEventCallback<LongPollParsedEvent>>> =
+    private val eventParser = LongPollEventParser(
-        mutableMapOf()
+        coroutineScope = coroutineScope,
+        convoUseCase = convoUseCase,
+        messagesUseCase = messagesUseCase,
+        dispatch = eventDispatcher::dispatch,
+        dispatchAll = eventDispatcher::dispatchAll
+    )
 
     fun parseNextUpdate(event: List<Any>) {
-        val eventId = event.first().asInt()
+        eventParser.parseNextUpdate(event)
-
-        when (val eventType = ApiEvent.parseOrNull(eventId)) {
-            null -> Log.d("LongPollUpdatesParser", "parseNextUpdate: unknownEvent: $event")
-
-            ApiEvent.MESSAGE_SET_FLAGS -> parseMessageSetFlags(eventType, event)
-            ApiEvent.MESSAGE_CLEAR_FLAGS -> parseMessageClearFlags(eventType, event)
-            ApiEvent.MESSAGE_NEW -> parseMessageNew(eventType, event)
-            ApiEvent.MESSAGE_EDIT -> parseMessageEdit(eventType, event)
-            ApiEvent.MESSAGE_READ_INCOMING -> parseMessageReadIncoming(eventType, event)
-            ApiEvent.MESSAGE_READ_OUTGOING -> parseMessageReadOutgoing(eventType, event)
-            ApiEvent.CHAT_CLEAR_FLAGS -> parseChatClearFlags(eventType, event)
-            ApiEvent.CHAT_SET_FLAGS -> parseChatSetFlags(eventType, event)
-            ApiEvent.MESSAGES_DELETED -> parseMessagesDeleted(eventType, event)
-            ApiEvent.CHAT_MAJOR_CHANGED -> parseChatMajorChanged(eventType, event)
-            ApiEvent.CHAT_MINOR_CHANGED -> parseChatMinorChanged(eventType, event)
-
-            ApiEvent.TYPING,
-            ApiEvent.AUDIO_MESSAGE_RECORDING,
-            ApiEvent.PHOTO_UPLOADING,
-            ApiEvent.VIDEO_UPLOADING,
-            ApiEvent.FILE_UPLOADING -> parseInteraction(eventType, event)
-
-            ApiEvent.UNREAD_COUNT_UPDATE -> parseUnreadCounterUpdate(eventType, event)
-            ApiEvent.MESSAGE_UPDATED -> parseMessageUpdated(eventType, event)
-            ApiEvent.MESSAGE_CACHE_CLEAR -> parseMessageCacheClear(eventType, event)
-        }
-    }
-
-    private fun parseMessageSetFlags(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val cmId = event[1].asLong()
-        val flags = event[2].asInt()
-        val peerId = event[3].asLong()
-
-        val eventsToSend = mutableListOf<LongPollParsedEvent>()
-
-        val parsedFlags = MessageFlags.parse(flags)
-        parsedFlags.forEach { flag ->
-            when (flag) {
-                MessageFlags.IMPORTANT -> {
-                    val eventToSend = LongPollParsedEvent.MessageMarkedAsImportant(
-                        peerId = peerId,
-                        cmId = cmId,
-                        marked = true
-                    )
-                    eventsToSend += eventToSend
-
-                    listenersMap[LongPollEvent.MARKED_AS_IMPORTANT]?.let { listeners ->
-                        listeners.map { vkEventCallback ->
-                            (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageMarkedAsImportant>)
-                                ?.onEvent(eventToSend)
-                        }
-                    }
-                }
-
-                MessageFlags.SPAM -> {
-                    val eventToSend = LongPollParsedEvent.MessageMarkedAsSpam(
-                        peerId = peerId,
-                        cmId = cmId
-                    )
-                    eventsToSend += eventToSend
-
-                    listenersMap[LongPollEvent.MARKED_AS_SPAM]?.let { listeners ->
-                        listeners.map { vkEventCallback ->
-                            (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageMarkedAsSpam>)
-                                ?.onEvent(eventToSend)
-                        }
-                    }
-                }
-
-                MessageFlags.DELETED -> {
-                    val eventToSend =
-                        if (parsedFlags.contains(MessageFlags.DELETED_FOR_ALL)) {
-                            LongPollParsedEvent.MessageDeleted(
-                                peerId = peerId,
-                                cmId = cmId,
-                                forAll = true
-                            )
-                        } else {
-                            LongPollParsedEvent.MessageDeleted(
-                                peerId = peerId,
-                                cmId = cmId,
-                                forAll = false
-                            )
-                        }
-                    eventsToSend += eventToSend
-
-                    listenersMap[LongPollEvent.MESSAGE_DELETED]?.let { listeners ->
-                        listeners.map { vkEventCallback ->
-                            (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageDeleted>)
-                                ?.onEvent(eventToSend)
-                        }
-                    }
-                }
-
-                MessageFlags.AUDIO_LISTENED -> {
-                    val eventToSend = LongPollParsedEvent.AudioMessageListened(
-                        peerId = peerId,
-                        cmId = cmId
-                    )
-                    eventsToSend += eventToSend
-
-                    listenersMap[LongPollEvent.AUDIO_MESSAGE_LISTENED]?.let { listeners ->
-                        listeners.map { vkEventCallback ->
-                            (vkEventCallback as? VkEventCallback<LongPollParsedEvent.AudioMessageListened>)
-                                ?.onEvent(eventToSend)
-                        }
-                    }
-                }
-
-                else -> Unit
-            }
-        }
-
-        eventsToSend.forEach { eventToSend ->
-            listenersMap[LongPollEvent.MESSAGE_SET_FLAGS]?.let { listeners ->
-                listeners.map { vkEventCallback ->
-                    (vkEventCallback as? VkEventCallback<LongPollParsedEvent>)?.onEvent(eventToSend)
-                }
-            }
-        }
-    }
-
-    private fun parseMessageClearFlags(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val cmId = event[1].asLong()
-        val flags = event[2].asInt()
-        val peerId = event[3].asLong()
-
-        val eventsToSend = mutableListOf<LongPollParsedEvent>()
-
-        val parsedFlags = MessageFlags.parse(flags)
-
-        coroutineScope.launch {
-            parsedFlags.forEach { flag ->
-                when (flag) {
-                    MessageFlags.IMPORTANT -> {
-                        val eventToSend = LongPollParsedEvent.MessageMarkedAsImportant(
-                            peerId = peerId,
-                            cmId = cmId,
-                            marked = false
-                        )
-                        eventsToSend += eventToSend
-
-                        listenersMap[LongPollEvent.MARKED_AS_IMPORTANT]?.let { listeners ->
-                            listeners.map { vkEventCallback ->
-                                (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageMarkedAsImportant>)
-                                    ?.onEvent(eventToSend)
-                            }
-                        }
-                    }
-
-                    MessageFlags.SPAM -> {
-                        if (parsedFlags.contains(MessageFlags.CANCEL_SPAM)) {
-                            withContext(Dispatchers.IO) {
-                                val message = loadMessage(
-                                    peerId = peerId,
-                                    cmId = cmId
-                                )
-                                message?.let {
-                                    val eventToSend =
-                                        LongPollParsedEvent.MessageMarkedAsNotSpam(message = message)
-                                    eventsToSend += eventToSend
-
-                                    listenersMap[LongPollEvent.MARKED_AS_NOT_SPAM]?.let { listeners ->
-                                        listeners.map { vkEventCallback ->
-                                            (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageMarkedAsNotSpam>)
-                                                ?.onEvent(eventToSend)
-                                        }
-                                    }
-                                }
-                            }
-                        }
-                    }
-
-                    MessageFlags.DELETED -> {
-                        withContext(Dispatchers.IO) {
-                            val message = loadMessage(
-                                peerId = peerId,
-                                cmId = cmId
-                            )
-                            message?.let {
-                                val eventToSend =
-                                    LongPollParsedEvent.MessageRestored(message = message)
-                                eventsToSend += eventToSend
-
-                                listenersMap[LongPollEvent.MESSAGE_RESTORED]?.let { listeners ->
-                                    listeners.map { vkEventCallback ->
-                                        (vkEventCallback as? VkEventCallback<LongPollParsedEvent.MessageRestored>)
-                                            ?.onEvent(eventToSend)
-                                    }
-                                }
-                            }
-                        }
-                    }
-
-                    else -> Unit
-                }
-            }
-
-            eventsToSend.forEach { eventToSend ->
-                listenersMap[LongPollEvent.MESSAGE_CLEAR_FLAGS]?.let { listeners ->
-                    listeners.map { vkEventCallback ->
-                        vkEventCallback.onEvent(eventToSend)
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseMessageNew(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val cmId = event[1].asLong()
-        val peerId = event[4].asLong()
-
-        coroutineScope.launch(Dispatchers.IO) {
-            val message =
-                async { loadMessage(peerId = peerId, cmId = cmId) }.await()
-
-            val convo =
-                async {
-                    loadConvo(
-                        peerId = peerId,
-                        extended = true,
-                        fields = VkConstants.ALL_FIELDS
-                    )
-                }.await()
-
-            message?.let {
-                listenersMap[LongPollEvent.MESSAGE_NEW]?.let {
-                    it.map { vkEventCallback ->
-                        (vkEventCallback as VkEventCallback<LongPollParsedEvent.NewMessage>)
-                            .onEvent(
-                                LongPollParsedEvent.NewMessage(
-                                    message = message,
-                                    inArchive = convo?.isArchived == true
-                                    // TODO: 03-Apr-25, Danil Nikolaev:
-                                    // load user settings about restoring chats with
-                                    // enabled notifications from archive
-                                )
-                            )
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseMessageEdit(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val cmId = event[1].asLong()
-        val peerId = event[3].asLong()
-
-        coroutineScope.launch(Dispatchers.IO) {
-            loadMessage(
-                peerId = peerId,
-                cmId = cmId
-            )?.let { message ->
-                listenersMap[LongPollEvent.MESSAGE_EDITED]?.let {
-                    it.map { vkEventCallback ->
-                        (vkEventCallback as VkEventCallback<LongPollParsedEvent.MessageEdited>)
-                            .onEvent(LongPollParsedEvent.MessageEdited(message))
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseMessageReadIncoming(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-        val peerId = event[1].asLong()
-        val cmId = event[2].asLong()
-        val unreadCount = event[3].asInt()
-
-        listenersMap[LongPollEvent.INCOMING_MESSAGE_READ]?.let { listeners ->
-            listeners.map { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.IncomingMessageRead>)
-                    .onEvent(
-                        LongPollParsedEvent.IncomingMessageRead(
-                            peerId = peerId,
-                            cmId = cmId,
-                            unreadCount = unreadCount
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseMessageReadOutgoing(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-        val peerId = event[1].asLong()
-        val cmId = event[2].asLong()
-        val unreadCount = event[3].asInt()
-
-        listenersMap[LongPollEvent.OUTGOING_MESSAGE_READ]?.let { listeners ->
-            listeners.map { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.OutgoingMessageRead>)
-                    .onEvent(
-                        LongPollParsedEvent.OutgoingMessageRead(
-                            peerId = peerId,
-                            cmId = cmId,
-                            unreadCount = unreadCount
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseChatClearFlags(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val peerId = event[1].asLong()
-        val flags = event[2].asInt()
-
-        val eventsToSend = mutableListOf<LongPollParsedEvent>()
-
-        val parsedFlags = ConvoFlags.parse(flags)
-
-        coroutineScope.launch(Dispatchers.IO) {
-            parsedFlags.forEach { flag ->
-                when (flag) {
-                    ConvoFlags.ARCHIVED -> {
-                        val convo = loadConvo(
-                            peerId = peerId,
-                            extended = true,
-                            fields = VkConstants.ALL_FIELDS
-                        ) ?: return@forEach
-
-                        val message = loadMessage(
-                            peerId = peerId,
-                            cmId = convo.lastCmId
-                        )
-
-                        val eventToSend = LongPollParsedEvent.ChatArchived(
-                            convo = convo.copy(lastMessage = message),
-                            archived = false
-                        )
-                        eventsToSend += eventToSend
-
-                        listenersMap[LongPollEvent.CHAT_ARCHIVED]?.let { listeners ->
-                            listeners.map { vkEventCallback ->
-                                (vkEventCallback as? VkEventCallback<LongPollParsedEvent.ChatArchived>)
-                                    ?.onEvent(eventToSend)
-                            }
-                        }
-                    }
-
-                    else -> Unit
-                }
-            }
-
-            eventsToSend.forEach { eventToSend ->
-                listenersMap[LongPollEvent.CHAT_CLEAR_FLAGS]?.let { listeners ->
-                    listeners.map { vkEventCallback ->
-                        (vkEventCallback as? VkEventCallback<LongPollParsedEvent>)?.onEvent(
-                            eventToSend
-                        )
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseChatSetFlags(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val peerId = event[1].asLong()
-        val flags = event[2].asInt()
-
-        val eventsToSend = mutableListOf<LongPollParsedEvent>()
-
-        val parsedFlags = ConvoFlags.parse(flags)
-
-        coroutineScope.launch(Dispatchers.IO) {
-            parsedFlags.forEach { flag ->
-                when (flag) {
-                    ConvoFlags.ARCHIVED -> {
-                        val convo = loadConvo(
-                            peerId = peerId,
-                            extended = true,
-                            fields = VkConstants.ALL_FIELDS
-                        ) ?: return@forEach
-
-                        val message = loadMessage(
-                            peerId = peerId,
-                            cmId = convo.lastCmId
-                        )
-
-                        val eventToSend = LongPollParsedEvent.ChatArchived(
-                            convo = convo.copy(lastMessage = message),
-                            archived = true
-                        )
-                        eventsToSend += eventToSend
-
-                        listenersMap[LongPollEvent.CHAT_ARCHIVED]?.let { listeners ->
-                            listeners.map { vkEventCallback ->
-                                (vkEventCallback as? VkEventCallback<LongPollParsedEvent.ChatArchived>)
-                                    ?.onEvent(eventToSend)
-                            }
-                        }
-                    }
-
-                    else -> Unit
-                }
-            }
-
-            eventsToSend.forEach { eventToSend ->
-                listenersMap[LongPollEvent.CHAT_SET_FLAGS]?.let { listeners ->
-                    listeners.map { vkEventCallback ->
-                        (vkEventCallback as? VkEventCallback<LongPollParsedEvent>)?.onEvent(
-                            eventToSend
-                        )
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseMessagesDeleted(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val peerId = event[1].asLong()
-        val cmId = event[2].asLong()
-
-        listenersMap[LongPollEvent.CHAT_CLEARED]?.let { listeners ->
-            listeners.forEach { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.ChatCleared>)
-                    .onEvent(
-                        LongPollParsedEvent.ChatCleared(
-                            peerId = peerId,
-                            toCmId = cmId
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseChatMajorChanged(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val peerId = event[1].asLong()
-        val majorId = event[2].asInt()
-
-        listenersMap[LongPollEvent.CHAT_MAJOR_CHANGED]?.let { listeners ->
-            listeners.forEach { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.ChatMajorChanged>)
-                    .onEvent(
-                        LongPollParsedEvent.ChatMajorChanged(
-                            peerId = peerId,
-                            majorId = majorId,
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseChatMinorChanged(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val peerId = event[1].asLong()
-        val minorId = event[2].asInt()
-
-        listenersMap[LongPollEvent.CHAT_MINOR_CHANGED]?.let { listeners ->
-            listeners.forEach { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.ChatMinorChanged>)
-                    .onEvent(
-                        LongPollParsedEvent.ChatMinorChanged(
-                            peerId = peerId,
-                            minorId = minorId,
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseInteraction(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType: $event")
-
-        val interactionType = when (eventType) {
-            ApiEvent.TYPING -> InteractionType.Typing
-            ApiEvent.AUDIO_MESSAGE_RECORDING -> InteractionType.VoiceMessage
-            ApiEvent.PHOTO_UPLOADING -> InteractionType.Photo
-            ApiEvent.VIDEO_UPLOADING -> InteractionType.Video
-            ApiEvent.FILE_UPLOADING -> InteractionType.File
-            else -> return
-        }
-
-        val longPollEvent: LongPollEvent = when (eventType) {
-            ApiEvent.TYPING -> LongPollEvent.TYPING
-            ApiEvent.AUDIO_MESSAGE_RECORDING -> LongPollEvent.AUDIO_MESSAGE_RECORDING
-            ApiEvent.PHOTO_UPLOADING -> LongPollEvent.PHOTO_UPLOADING
-            ApiEvent.VIDEO_UPLOADING -> LongPollEvent.VIDEO_UPLOADING
-            ApiEvent.FILE_UPLOADING -> LongPollEvent.FILE_UPLOADING
-            else -> return
-        }
-
-        val peerId = event[1].asLong()
-        val userIds = event[2].toList(Any::asLong).filter { it != UserConfig.userId }
-        val totalCount = event[3].asInt()
-        val timestamp = event[4].asInt()
-
-        // if userIds contains only account's id, then we don't need to show our status
-        if (userIds.isEmpty()) return
-
-        listenersMap[longPollEvent]?.let { listeners ->
-            listeners.forEach { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.Interaction>)
-                    .onEvent(
-                        LongPollParsedEvent.Interaction(
-                            interactionType = interactionType,
-                            peerId = peerId,
-                            userIds = userIds,
-                            totalCount = totalCount,
-                            timestamp = timestamp
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseUnreadCounterUpdate(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType $event")
-
-        val unreadCount = event[1].asInt()
-        val unreadUnmutedCount = event[2].asInt()
-        val showOnlyMuted = event[3].asInt() == 1
-        val businessNotifyUnreadCount = event[4].asInt()
-        val archiveUnreadCount = event[7].asInt()
-        val archiveUnreadUnmutedCount = event[8].asInt()
-        val archiveMentionsCount = event[9].asInt()
-
-        listenersMap[LongPollEvent.UNREAD_COUNTER_UPDATE]?.let { listeners ->
-            listeners.forEach { vkEventCallback ->
-                (vkEventCallback as VkEventCallback<LongPollParsedEvent.UnreadCounter>)
-                    .onEvent(
-                        LongPollParsedEvent.UnreadCounter(
-                            unread = unreadCount,
-                            unreadUnmuted = unreadUnmutedCount,
-                            showOnlyMuted = showOnlyMuted,
-                            business = businessNotifyUnreadCount,
-                            archive = archiveUnreadCount,
-                            archiveUnmuted = archiveUnreadUnmutedCount,
-                            archiveMentions = archiveMentionsCount
-                        )
-                    )
-            }
-        }
-    }
-
-    private fun parseMessageUpdated(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType $event")
-
-        val cmId = event[1].asLong()
-        val peerId = event[4].asLong()
-
-        coroutineScope.launch(Dispatchers.IO) {
-            loadMessage(
-                peerId = peerId,
-                cmId = cmId
-            )?.let { message ->
-                listenersMap[LongPollEvent.MESSAGE_UPDATED]?.let {
-                    it.map { vkEventCallback ->
-                        (vkEventCallback as VkEventCallback<LongPollParsedEvent.MessageUpdated>)
-                            .onEvent(LongPollParsedEvent.MessageUpdated(message))
-                    }
-                }
-            }
-        }
-    }
-
-    private fun parseMessageCacheClear(eventType: ApiEvent, event: List<Any>) {
-        Log.d("LongPollUpdatesParser", "$eventType $event")
-
-        val messageId = event[1].asLong()
-
-        coroutineScope.launch(Dispatchers.IO) {
-            loadMessage(messageId = messageId)?.let { message ->
-                listenersMap[LongPollEvent.MESSAGE_CACHE_CLEAR]?.let {
-                    it.map { vkEventCallback ->
-                        (vkEventCallback as VkEventCallback<LongPollParsedEvent.MessageCacheClear>)
-                            .onEvent(LongPollParsedEvent.MessageCacheClear(message))
-                    }
-                }
-            }
-        }
-    }
-
-    private suspend fun loadMessage(
-        peerId: Long? = null,
-        cmId: Long? = null,
-        messageId: Long? = null
-    ): VkMessage? = suspendCoroutine { continuation ->
-        require((peerId != null && cmId != null) || messageId != null)
-
-        coroutineScope.launch(Dispatchers.IO) {
-            messagesUseCase.getById(
-                peerCmIds = null,
-                peerId = peerId,
-                messageIds = messageId?.let(::listOf),
-                cmIds = cmId?.let(::listOf),
-                extended = true,
-                fields = VkConstants.ALL_FIELDS
-            ).listenValue(this) { state ->
-                state.processState(
-                    error = { error ->
-                        Log.e("LongPollUpdatesParser", "loadMessage: error: $error")
-                        continuation.resume(null)
-                    },
-                    success = { response ->
-                        val message = response.singleOrNull() ?: run {
-                            continuation.resume(null)
-                            return@listenValue
-                        }
-
-                        continuation.resume(message)
-                    }
-                )
-            }
-        }
-    }
-
-    private suspend fun loadConvo(
-        peerId: Long,
-        extended: Boolean = false,
-        fields: String? = null
-    ): VkConvo? = suspendCoroutine { continuation ->
-        coroutineScope.launch(Dispatchers.IO) {
-            convoUseCase.getById(
-                peerIds = listOf(peerId),
-                extended = extended,
-                fields = fields
-            ).listenValue(coroutineScope) { state ->
-                state.processState(
-                    error = { error ->
-                        Log.e("LongPollUpdatesParser", "loadConvo: error: $error")
-                        continuation.resume(null)
-                    },
-                    success = { response ->
-                        val convo = response.singleOrNull() ?: run {
-                            continuation.resume(null)
-                            return@listenValue
-                        }
-
-                        continuation.resume(convo)
-                    }
-                )
-            }
-        }
-    }
-
-    @Suppress("UNCHECKED_CAST")
-    private fun <T : LongPollParsedEvent> registerListener(
-        eventType: LongPollEvent,
-        listener: VkEventCallback<T>
-    ) {
-        listenersMap.let { map ->
-            map[eventType] = (map[eventType] ?: mutableListOf())
-                .also {
-                    it.add(listener as VkEventCallback<LongPollParsedEvent>)
-                }
-        }
-    }
-
-    private fun <T : LongPollParsedEvent> registerListeners(
-        eventTypes: List<LongPollEvent>,
-        listener: VkEventCallback<T>
-    ) {
-        eventTypes.forEach { eventType -> registerListener(eventType, listener) }
     }
 
     fun onMessageSetFlags(block: (LongPollParsedEvent) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_SET_FLAGS, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_SET_FLAGS, assembleEventCallback(block))
     }
 
     fun onMessageMarkedAsImportant(block: (LongPollParsedEvent.MessageMarkedAsImportant) -> Unit) {
-        registerListener(LongPollEvent.MARKED_AS_IMPORTANT, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MARKED_AS_IMPORTANT, assembleEventCallback(block))
     }
 
     fun onMessageMarkedAsSpam(block: (LongPollParsedEvent.MessageMarkedAsSpam) -> Unit) {
-        registerListener(LongPollEvent.MARKED_AS_SPAM, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MARKED_AS_SPAM, assembleEventCallback(block))
     }
 
     fun onMessageDeleted(block: (LongPollParsedEvent.MessageDeleted) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_DELETED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_DELETED, assembleEventCallback(block))
     }
 
     fun onMessageClearFlags(block: (LongPollParsedEvent) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_CLEAR_FLAGS, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_CLEAR_FLAGS, assembleEventCallback(block))
     }
 
     fun onMessageMarkedAsNotSpam(block: (LongPollParsedEvent.MessageMarkedAsNotSpam) -> Unit) {
-        registerListener(LongPollEvent.MARKED_AS_NOT_SPAM, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MARKED_AS_NOT_SPAM, assembleEventCallback(block))
     }
 
     fun onMessageRestored(block: (LongPollParsedEvent.MessageRestored) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_RESTORED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_RESTORED, assembleEventCallback(block))
+    }
+
+    fun onMessageUpdated(block: (LongPollParsedEvent.MessageUpdated) -> Unit) {
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_UPDATED, assembleEventCallback(block))
+    }
+
+    fun onMessageCacheClear(block: (LongPollParsedEvent.MessageCacheClear) -> Unit) {
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_CACHE_CLEAR, assembleEventCallback(block))
     }
 
     fun onNewMessage(block: (LongPollParsedEvent.NewMessage) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_NEW, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_NEW, assembleEventCallback(block))
     }
 
     fun onMessageEdited(block: (LongPollParsedEvent.MessageEdited) -> Unit) {
-        registerListener(LongPollEvent.MESSAGE_EDITED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.MESSAGE_EDITED, assembleEventCallback(block))
     }
 
     fun onMessageIncomingRead(block: (LongPollParsedEvent.IncomingMessageRead) -> Unit) {
-        registerListener(LongPollEvent.INCOMING_MESSAGE_READ, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.INCOMING_MESSAGE_READ, assembleEventCallback(block))
     }
 
     fun onMessageOutgoingRead(block: (LongPollParsedEvent.OutgoingMessageRead) -> Unit) {
-        registerListener(LongPollEvent.OUTGOING_MESSAGE_READ, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.OUTGOING_MESSAGE_READ, assembleEventCallback(block))
     }
 
     fun onChatCleared(block: (LongPollParsedEvent.ChatCleared) -> Unit) {
-        registerListener(LongPollEvent.CHAT_CLEARED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.CHAT_CLEARED, assembleEventCallback(block))
     }
 
     fun onChatMajorChanged(block: (LongPollParsedEvent.ChatMajorChanged) -> Unit) {
-        registerListener(LongPollEvent.CHAT_MAJOR_CHANGED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.CHAT_MAJOR_CHANGED, assembleEventCallback(block))
     }
 
     fun onChatMinorChanged(block: (LongPollParsedEvent.ChatMinorChanged) -> Unit) {
-        registerListener(LongPollEvent.CHAT_MINOR_CHANGED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.CHAT_MINOR_CHANGED, assembleEventCallback(block))
     }
 
     fun onChatArchived(block: (LongPollParsedEvent.ChatArchived) -> Unit) {
-        registerListener(LongPollEvent.CHAT_ARCHIVED, assembleEventCallback(block))
+        eventDispatcher.registerListener(LongPollEvent.CHAT_ARCHIVED, assembleEventCallback(block))
     }
 
     fun onInteractions(block: (LongPollParsedEvent.Interaction) -> Unit) {
-        registerListeners(
+        eventDispatcher.registerListeners(
             eventTypes = listOf(
                 LongPollEvent.TYPING,
                 LongPollEvent.AUDIO_MESSAGE_RECORDING,

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollUpdatesReducer.kt

@@ -0,0 +1,213 @@
+package dev.meloda.fast.domain
+
+import android.util.Log
+import dev.meloda.fast.model.LongPollParsedEvent
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.filterIsInstance
+import kotlinx.coroutines.launch
+
+class LongPollUpdatesReducer(
+    updatesParser: LongPollUpdatesParser,
+    private val messagesUseCase: MessagesUseCase,
+    private val convoUseCase: ConvoUseCase
+) {
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+
+    private val _events = MutableSharedFlow<LongPollParsedEvent>(extraBufferCapacity = 256)
+    val events: SharedFlow<LongPollParsedEvent> = _events.asSharedFlow()
+
+    val newMessages = events.filterIsInstance<LongPollParsedEvent.NewMessage>()
+    val messageEdited = events.filterIsInstance<LongPollParsedEvent.MessageEdited>()
+    val messageIncomingRead = events.filterIsInstance<LongPollParsedEvent.IncomingMessageRead>()
+    val messageOutgoingRead = events.filterIsInstance<LongPollParsedEvent.OutgoingMessageRead>()
+    val messageDeleted = events.filterIsInstance<LongPollParsedEvent.MessageDeleted>()
+    val messageRestored = events.filterIsInstance<LongPollParsedEvent.MessageRestored>()
+    val messageMarkedAsImportant = events.filterIsInstance<LongPollParsedEvent.MessageMarkedAsImportant>()
+    val messageMarkedAsSpam = events.filterIsInstance<LongPollParsedEvent.MessageMarkedAsSpam>()
+    val messageMarkedAsNotSpam = events.filterIsInstance<LongPollParsedEvent.MessageMarkedAsNotSpam>()
+    val interactions = events.filterIsInstance<LongPollParsedEvent.Interaction>()
+    val chatMajorChanged = events.filterIsInstance<LongPollParsedEvent.ChatMajorChanged>()
+    val chatMinorChanged = events.filterIsInstance<LongPollParsedEvent.ChatMinorChanged>()
+    val chatCleared = events.filterIsInstance<LongPollParsedEvent.ChatCleared>()
+    val chatArchived = events.filterIsInstance<LongPollParsedEvent.ChatArchived>()
+    val messageUpdated = events.filterIsInstance<LongPollParsedEvent.MessageUpdated>()
+    val messageCacheClear = events.filterIsInstance<LongPollParsedEvent.MessageCacheClear>()
+
+    init {
+        updatesParser.onNewMessage { publish(it) }
+        updatesParser.onMessageEdited { publish(it) }
+        updatesParser.onMessageIncomingRead { publish(it) }
+        updatesParser.onMessageOutgoingRead { publish(it) }
+        updatesParser.onMessageDeleted { publish(it) }
+        updatesParser.onMessageRestored { publish(it) }
+        updatesParser.onMessageUpdated { publish(it) }
+        updatesParser.onMessageCacheClear { publish(it) }
+        updatesParser.onMessageMarkedAsImportant { publish(it) }
+        updatesParser.onMessageMarkedAsSpam { publish(it) }
+        updatesParser.onMessageMarkedAsNotSpam { publish(it) }
+        updatesParser.onInteractions { publish(it) }
+        updatesParser.onChatMajorChanged { publish(it) }
+        updatesParser.onChatMinorChanged { publish(it) }
+        updatesParser.onChatCleared { publish(it) }
+        updatesParser.onChatArchived { publish(it) }
+    }
+
+    private fun publish(event: LongPollParsedEvent) {
+        scope.launch {
+            runCatching { applyCommon(event) }
+                .onFailure { throwable ->
+                    Log.e("LongPollUpdatesReducer", "applyCommon failed: $event", throwable)
+                }
+            _events.emit(event)
+        }
+    }
+
+    private suspend fun applyCommon(event: LongPollParsedEvent) {
+        when (event) {
+            is LongPollParsedEvent.NewMessage -> {
+                messagesUseCase.storeMessages(listOf(event.message))
+                updateConvoForMessage(event.message, unreadIncrement = if (event.message.isOut) 0 else 1)
+            }
+
+            is LongPollParsedEvent.MessageEdited -> {
+                messagesUseCase.storeMessage(event.message)
+            }
+
+            is LongPollParsedEvent.MessageUpdated -> {
+                messagesUseCase.storeMessage(event.message)
+            }
+
+            is LongPollParsedEvent.MessageCacheClear -> {
+                messagesUseCase.storeMessage(event.message)
+            }
+
+            is LongPollParsedEvent.IncomingMessageRead -> {
+                updateConvoReadState(
+                    peerId = event.peerId,
+                    inReadCmId = event.cmId,
+                    unreadCount = event.unreadCount
+                )
+            }
+
+            is LongPollParsedEvent.OutgoingMessageRead -> {
+                updateConvoReadState(
+                    peerId = event.peerId,
+                    outReadCmId = event.cmId,
+                    unreadCount = event.unreadCount
+                )
+            }
+
+            is LongPollParsedEvent.MessageDeleted -> {
+                val message = messagesUseCase.getLocalMessageByConvoMessageId(
+                    convoId = event.peerId,
+                    cmId = event.cmId
+                )
+                if (message != null) {
+                    messagesUseCase.deleteLocalMessages(listOf(message.id))
+                }
+            }
+
+            is LongPollParsedEvent.MessageRestored -> {
+                messagesUseCase.storeMessage(event.message)
+            }
+
+            is LongPollParsedEvent.MessageMarkedAsImportant -> {
+                val message = messagesUseCase.getLocalMessageByConvoMessageId(
+                    convoId = event.peerId,
+                    cmId = event.cmId
+                ) ?: return
+
+                messagesUseCase.storeMessage(message.copy(isImportant = event.marked))
+            }
+
+            is LongPollParsedEvent.MessageMarkedAsSpam -> {
+                val message = messagesUseCase.getLocalMessageByConvoMessageId(
+                    convoId = event.peerId,
+                    cmId = event.cmId
+                )
+                if (message != null) {
+                    messagesUseCase.deleteLocalMessages(listOf(message.id))
+                }
+            }
+
+            is LongPollParsedEvent.MessageMarkedAsNotSpam -> {
+                messagesUseCase.storeMessage(event.message)
+            }
+
+            is LongPollParsedEvent.ChatMajorChanged -> {
+                updateConvoSortState(event.peerId, majorId = event.majorId)
+            }
+
+            is LongPollParsedEvent.ChatMinorChanged -> {
+                updateConvoSortState(event.peerId, minorId = event.minorId)
+            }
+
+            is LongPollParsedEvent.ChatCleared -> {
+                convoUseCase.deleteLocalConvo(event.peerId)
+            }
+
+            is LongPollParsedEvent.ChatArchived -> {
+                event.convo.lastMessage?.let(messagesUseCase::storeMessage)
+                convoUseCase.storeConvos(listOf(event.convo.copy(isArchived = event.archived)))
+            }
+
+            is LongPollParsedEvent.Interaction -> Unit
+        }
+    }
+
+    private suspend fun updateConvoReadState(
+        peerId: Long,
+        inReadCmId: Long? = null,
+        outReadCmId: Long? = null,
+        unreadCount: Int
+    ) {
+        val convo = convoUseCase.getLocalConvoById(peerId) ?: return
+        convoUseCase.storeConvos(
+            listOf(
+                convo.copy(
+                    inReadCmId = inReadCmId ?: convo.inReadCmId,
+                    outReadCmId = outReadCmId ?: convo.outReadCmId,
+                    unreadCount = unreadCount
+                )
+            )
+        )
+    }
+
+    private suspend fun updateConvoSortState(
+        peerId: Long,
+        majorId: Int? = null,
+        minorId: Int? = null
+    ) {
+        val convo = convoUseCase.getLocalConvoById(peerId) ?: return
+        convoUseCase.storeConvos(
+            listOf(
+                convo.copy(
+                    majorId = majorId ?: convo.majorId,
+                    minorId = minorId ?: convo.minorId
+                )
+            )
+        )
+    }
+
+    private suspend fun updateConvoForMessage(
+        message: VkMessage,
+        unreadIncrement: Int
+    ) {
+        val convo = convoUseCase.getLocalConvoById(message.peerId) ?: return
+        convoUseCase.storeConvos(
+            listOf(
+                convo.copy(
+                    lastMessageId = message.id,
+                    lastCmId = message.cmId,
+                    unreadCount = convo.unreadCount + unreadIncrement
+                )
+            )
+        )
+    }
+}

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollUseCase.kt

@@ -1,6 +1,7 @@
 package dev.meloda.fast.domain
 
 import dev.meloda.fast.data.State
+import dev.meloda.fast.model.api.data.LongPollHistoryResponse
 import dev.meloda.fast.model.api.data.LongPollUpdates
 import dev.meloda.fast.model.api.data.VkLongPollData
 import kotlinx.coroutines.flow.Flow
@@ -21,4 +22,14 @@ interface LongPollUseCase {
         mode: Int,
         version: Int
     ): Flow<State<LongPollUpdates>>
+
+    fun getLongPollHistory(
+        ts: Int,
+        pts: Int,
+        lpVersion: Int,
+        lastN: Int? = null,
+        maxMsgId: Long? = null,
+        eventsLimit: Int? = null,
+        msgsLimit: Int? = null
+    ): Flow<State<LongPollHistoryResponse>>
 }

core/domain/src/main/kotlin/dev/meloda/fast/domain/LongPollUseCaseImpl.kt

@@ -3,6 +3,7 @@ package dev.meloda.fast.domain
 import dev.meloda.fast.data.State
 import dev.meloda.fast.data.api.longpoll.LongPollRepository
 import dev.meloda.fast.data.mapToState
+import dev.meloda.fast.model.api.data.LongPollHistoryResponse
 import dev.meloda.fast.model.api.data.LongPollUpdates
 import dev.meloda.fast.model.api.data.VkLongPollData
 import kotlinx.coroutines.flow.Flow
@@ -48,4 +49,27 @@ class LongPollUseCaseImpl(
         ).mapToState()
         emit(newState)
     }
+
+    override fun getLongPollHistory(
+        ts: Int,
+        pts: Int,
+        lpVersion: Int,
+        lastN: Int?,
+        maxMsgId: Long?,
+        eventsLimit: Int?,
+        msgsLimit: Int?
+    ): Flow<State<LongPollHistoryResponse>> = flow {
+        emit(State.Loading)
+
+        val newState = repository.getLongPollHistory(
+            ts = ts,
+            pts = pts,
+            lpVersion = lpVersion,
+            lastN = lastN,
+            maxMsgId = maxMsgId,
+            eventsLimit = eventsLimit,
+            msgsLimit = msgsLimit
+        ).mapToState()
+        emit(newState)
+    }
 }

core/domain/src/main/kotlin/dev/meloda/fast/domain/MessagesUseCase.kt

@@ -12,6 +12,11 @@ interface MessagesUseCase : BaseUseCase {
 
     suspend fun storeMessage(message: VkMessage)
     suspend fun storeMessages(messages: List<VkMessage>)
+    suspend fun getLocalMessages(convoId: Long): List<VkMessage>
+    suspend fun getLocalMessageById(messageId: Long): VkMessage?
+    suspend fun getLocalMessageByConvoMessageId(convoId: Long, cmId: Long): VkMessage?
+    suspend fun getLocalMaxMessageId(): Long?
+    suspend fun deleteLocalMessages(messageIds: List<Long>)
 
     fun getMessagesHistory(
         convoId: Long,

core/domain/src/main/kotlin/dev/meloda/fast/domain/MessagesUseCaseImpl.kt

@@ -22,6 +22,26 @@ class MessagesUseCaseImpl(
         repository.storeMessages(messages)
     }
 
+    override suspend fun getLocalMessages(convoId: Long): List<VkMessage> {
+        return repository.getLocalMessages(convoId)
+    }
+
+    override suspend fun getLocalMessageById(messageId: Long): VkMessage? {
+        return repository.getLocalMessageById(messageId)
+    }
+
+    override suspend fun getLocalMessageByConvoMessageId(convoId: Long, cmId: Long): VkMessage? {
+        return repository.getLocalMessageByConvoMessageId(convoId, cmId)
+    }
+
+    override suspend fun getLocalMaxMessageId(): Long? {
+        return repository.getLocalMaxMessageId()
+    }
+
+    override suspend fun deleteLocalMessages(messageIds: List<Long>) {
+        repository.deleteLocalMessages(messageIds)
+    }
+
     override fun getMessagesHistory(
         convoId: Long,
         count: Int?,

core/domain/src/main/kotlin/dev/meloda/fast/domain/OAuthUseCaseImpl.kt

@@ -22,22 +22,35 @@ class OAuthUseCaseImpl(
     ): Flow<State<AuthInfo>> = flow {
         emit(State.Loading)
 
-        val newState = oAuthRepository.auth(
+        val newState = when (val authResult = oAuthRepository.auth(
             login = login,
             password = password,
             forceSms = forceSms,
             validationCode = validationCode,
             captchaSid = captchaSid,
             captchaKey = captchaKey
-        ).asState(
+        )) {
-            successMapper = {
+            is com.slack.eithernet.ApiResult.Success -> {
+                val value = authResult.value
+                val userId = value.userId
+                val accessToken = value.accessToken
+                val validationHash = value.validationHash
+
+                if (userId == null || accessToken == null || validationHash == null) {
+                    State.Error.InternalError
+                } else {
+                    State.Success(
                         AuthInfo(
-                    userId = it.userId!!,
+                            userId = userId,
-                    accessToken = it.accessToken!!,
+                            accessToken = accessToken,
-                    validationHash = it.validationHash!!
+                            validationHash = validationHash
+                        )
                     )
                 }
-        )
+            }
+
+            else -> authResult.asState()
+        }
 
         emit(newState)
     }

core/model/src/main/kotlin/dev/meloda/fast/model/api/data/LongPollHistoryResponse.kt

@@ -0,0 +1,24 @@
+package dev.meloda.fast.model.api.data
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = true)
+data class LongPollHistoryResponse(
+    @Json(name = "history") val history: List<List<Any>>? = null,
+    @Json(name = "messages") val messages: Messages? = null,
+    @Json(name = "profiles") val profiles: List<VkUserData>? = null,
+    @Json(name = "groups") val groups: List<VkGroupData>? = null,
+    @Json(name = "new_pts") val newPts: Int? = null,
+    @Json(name = "from_pts") val fromPts: Int? = null,
+    @Json(name = "ts") val ts: Int? = null,
+    @Json(name = "pts") val pts: Int? = null,
+    @Json(name = "more") val more: Int? = null,
+    @Json(name = "conversations") val conversations: List<VkConvoData>? = null
+) {
+    @JsonClass(generateAdapter = true)
+    data class Messages(
+        @Json(name = "count") val count: Int? = null,
+        @Json(name = "items") val items: List<VkMessageData>? = null
+    )
+}

core/model/src/main/kotlin/dev/meloda/fast/model/api/requests/LongPollRequests.kt

@@ -19,3 +19,27 @@ data class LongPollGetUpdatesRequest(
             "version" to version.toString()
         )
 }
+
+data class LongPollGetHistoryRequest(
+    val ts: Int,
+    val pts: Int,
+    val lpVersion: Int,
+    val lastN: Int? = null,
+    val maxMsgId: Long? = null,
+    val eventsLimit: Int? = null,
+    val msgsLimit: Int? = null,
+    val extended: Boolean = true,
+) {
+    val map: Map<String, String>
+        get() = mutableMapOf(
+            "ts" to ts.toString(),
+            "pts" to pts.toString(),
+            "lp_version" to lpVersion.toString(),
+            "extended" to if (extended) "1" else "0",
+        ).apply {
+            lastN?.let { this["last_n"] = it.toString() }
+            maxMsgId?.let { this["max_msg_id"] = it.toString() }
+            eventsLimit?.let { this["events_limit"] = it.toString() }
+            msgsLimit?.let { this["msgs_limit"] = it.toString() }
+        }
+}

core/network/src/main/kotlin/dev/meloda/fast/network/interceptor/Error14HandlingInterceptor.kt

@@ -1,90 +1,62 @@
 package dev.meloda.fast.network.interceptor
 
-import android.util.Log
-import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.datastore.AppSettings
 import dev.meloda.fast.datastore.CaptchaTokenResult
-import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.withTimeout
 import okhttp3.Interceptor
 import okhttp3.Request
 import okhttp3.Response
 import org.json.JSONObject
-import java.util.concurrent.Executors
+import java.io.IOException
 import java.util.concurrent.atomic.AtomicReference
+import kotlin.time.Duration.Companion.minutes
 
-class Error14HandlingInterceptor(
+class Error14HandlingInterceptor : Interceptor {
-//    private val domains: Set<String> = emptySet(),
-) : Interceptor {
 
     private val cookie = AtomicReference<String?>(null)
-
+    private val captchaMutex = Mutex()
-    private companion object {
-        private const val CAPTCHA_ERROR_CODE = 14
-        private const val CAPTCHA_ERROR_KIND = "need_captcha"
-        private val executor = Executors.newSingleThreadExecutor()
-    }
 
     override fun intercept(chain: Interceptor.Chain): Response {
         val request = chain.request().withCookie()
         val response = chain.proceed(request)
         response.parseCookie()
+
         if (request.shouldSkipCaptcha()) return response
+
         val redirectUri = response.getRedirectUri() ?: return response
-        val token = passCaptchaAndGetToken(redirectUri)
+        val token = awaitCaptchaToken(redirectUri)
+
         return chain.proceed(chain.request().withCookie().withSuccessToken(token))
     }
 
-    private fun passCaptchaAndGetToken(redirectUri: String): String = synchronized(this) {
+    private fun awaitCaptchaToken(redirectUri: String): String = runBlocking(Dispatchers.IO) {
-        val tokenResult = AtomicReference<Result<String>>(Result.failure(Exception("No result")))
+        captchaMutex.withLock {
-
+            AppSettings.setCaptchaResult(CaptchaTokenResult.Initial)
-        executor.submit {
             AppSettings.setCaptchaRedirectUri(redirectUri)
-            Log.d("Error14Interceptor", "passCaptchaAndGetToken: $redirectUri")
 
-            var job: Job? = null
+            try {
-            job = AppSettings.getCaptchaResultFlow()
+                withTimeout(CAPTCHA_TIMEOUT) {
-                .listenValue(CoroutineScope(Dispatchers.IO)) {
+                    AppSettings.getCaptchaResultFlow()
-                    Log.d("Error14Interceptor", "passCaptchaAndGetToken: $it")
+                        .first { it != CaptchaTokenResult.Initial }
-                    if (it != CaptchaTokenResult.Initial) {
+                        .toToken()
-                        synchronized(tokenResult) {
+                }
-                            Log.d(
+            } finally {
-                                "Error14Interceptor",
-                                "passCaptchaAndGetToken: SYNCHRONIZED: $it"
-                            )
-                            tokenResult.set(wrapResult(it))
-                            tokenResult.notifyAll()
-                            job?.cancel()
-                            Log.d(
-                                "Error14Interceptor",
-                                "passCaptchaAndGetToken: NULL RESULT"
-                            )
                 AppSettings.setCaptchaResult(CaptchaTokenResult.Initial)
                 AppSettings.setCaptchaRedirectUri(null)
             }
         }
     }
-        }
-        synchronized(tokenResult) {
-            if (tokenResult.get().getOrNull() == null) {
-                tokenResult.wait()
-            }
 
-            Log.d("Error14Interceptor", "passCaptchaAndGetToken: GET VALUE")
+    private fun CaptchaTokenResult.toToken(): String = when (this) {
-            tokenResult.get().getOrThrow()
+        is CaptchaTokenResult.Success -> token
-        }
+        CaptchaTokenResult.Cancelled -> throw IOException("Captcha cancelled")
-    }
+        CaptchaTokenResult.Null -> throw IOException("Captcha result is empty")
-
+        CaptchaTokenResult.Initial -> throw IllegalStateException("Captcha result not ready")
-    private fun wrapResult(result: CaptchaTokenResult): Result<String> {
-        return when (result) {
-            // TODO: 03/05/2026, Danil Nikolaev: check again?
-            CaptchaTokenResult.Null -> Result.success("")
-
-            CaptchaTokenResult.Cancelled, CaptchaTokenResult.Initial -> Result.success("")
-
-            is CaptchaTokenResult.Success -> Result.success(result.token)
-        }
     }
 
     private fun Request.withSuccessToken(token: String): Request {
@@ -133,13 +105,10 @@ class Error14HandlingInterceptor(
     private fun Request.withCookie(): Request {
         return newBuilder().apply { cookie.get()?.let { addHeader("Cookie", it) } }.build()
     }
+
+    private companion object {
+        private const val CAPTCHA_ERROR_CODE = 14
+        private const val CAPTCHA_ERROR_KIND = "need_captcha"
+        private val CAPTCHA_TIMEOUT = 10.minutes
+    }
 }
-
-@Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN", "NOTHING_TO_INLINE")
-private inline fun Any.wait() = (this as Object).wait()
-
-@Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN", "NOTHING_TO_INLINE")
-private inline fun Any.notify() = (this as Object).notify()
-
-@Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN", "NOTHING_TO_INLINE")
-private inline fun Any.notifyAll() = (this as Object).notifyAll()

core/network/src/main/kotlin/dev/meloda/fast/network/service/messages/MessagesService.kt

@@ -2,6 +2,7 @@ package dev.meloda.fast.network.service.messages
 
 import com.slack.eithernet.ApiResult
 import dev.meloda.fast.model.api.data.VkChatData
+import dev.meloda.fast.model.api.data.LongPollHistoryResponse
 import dev.meloda.fast.model.api.data.VkLongPollData
 import dev.meloda.fast.model.api.data.VkMessageData
 import dev.meloda.fast.model.api.responses.MessagesCreateChatResponse
@@ -44,6 +45,12 @@ interface MessagesService {
         @FieldMap params: Map<String, String>
     ): ApiResult<ApiResponse<VkLongPollData>, RestApiError>
 
+    @FormUrlEncoded
+    @POST(MessagesUrls.GET_LONG_POLL_HISTORY)
+    suspend fun getLongPollHistory(
+        @FieldMap params: Map<String, String>
+    ): ApiResult<ApiResponse<LongPollHistoryResponse>, RestApiError>
+
     @FormUrlEncoded
     @POST(MessagesUrls.MARK_AS_READ)
     suspend fun markAsRead(

feature/chatmaterials/src/main/kotlin/dev/meloda/fast/chatmaterials/ChatMaterialsViewModel.kt

@@ -9,12 +9,16 @@ import dev.meloda.fast.chatmaterials.navigation.ChatMaterials
 import dev.meloda.fast.chatmaterials.util.asPresentation
 import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.paging.canPaginate as canPaginatePage
+import dev.meloda.fast.common.paging.isPaginationExhausted as isPaginationExhaustedPage
+import dev.meloda.fast.common.paging.loadingFlags
+import dev.meloda.fast.common.paging.mergePage
 import dev.meloda.fast.data.State
+import dev.meloda.fast.data.VkUtils
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.domain.MessagesUseCase
 import dev.meloda.fast.model.BaseError
 import dev.meloda.fast.model.api.domain.VkAttachmentHistoryMessage
-import dev.meloda.fast.network.VkErrorCode
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 
@@ -89,11 +93,14 @@ class ChatMaterialsViewModelImpl(
             state.processState(
                 error = ::handleError,
                 success = { response ->
-                    val itemsCountSufficient = response.size == LOAD_COUNT
+                    val itemsCountSufficient = canPaginatePage(LOAD_COUNT, response.size)
                     canPaginate.setValue { itemsCountSufficient }
 
-                    val paginationExhausted = !itemsCountSufficient
+                    val paginationExhausted = isPaginationExhaustedPage(
-                            && screenState.value.materials.isNotEmpty()
+                        pageSize = LOAD_COUNT,
+                        loadedCount = response.size,
+                        hasExistingItems = screenState.value.materials.isNotEmpty()
+                    )
 
                     val loadedMaterials = response.mapNotNull(VkAttachmentHistoryMessage::asPresentation)
 
@@ -107,64 +114,27 @@ class ChatMaterialsViewModelImpl(
                         }
                     )
 
-                    if (offset == 0) {
-                        screenState.setValue {
-                            newState.copy(materials = loadedMaterials)
-                        }
-                    } else {
                     screenState.setValue {
                         newState.copy(
-                                materials = newState.materials.plus(loadedMaterials)
+                            materials = mergePage(newState.materials, loadedMaterials, offset)
                         )
                     }
                 }
-                }
             )
 
+            val flags = loadingFlags(offset, state.isLoading())
             screenState.setValue { old ->
                 old.copy(
-                    isLoading = offset == 0 && state.isLoading(),
+                    isLoading = flags.isLoading,
-                    isPaginating = offset > 0 && state.isLoading()
+                    isPaginating = flags.isPaginating
                 )
             }
         }
     }
 
     private fun handleError(error: State.Error) {
-        when (error) {
+        VkUtils.parseError(error)?.let { newBaseError ->
-            is State.Error.ApiError -> {
+            baseError.setValue { newBaseError }
-                when (error.errorCode) {
-                    VkErrorCode.USER_AUTHORIZATION_FAILED -> {
-                        baseError.setValue { BaseError.SessionExpired }
-                    }
-
-                    else -> {
-                        baseError.setValue {
-                            BaseError.SimpleError(message = error.errorMessage)
-                        }
-                    }
-                }
-            }
-
-            State.Error.ConnectionError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Connection error")
-                }
-            }
-
-            State.Error.InternalError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Internal error")
-                }
-            }
-
-            State.Error.UnknownError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Unknown error")
-                }
-            }
-
-            else -> Unit
         }
     }
 

feature/convos/src/main/kotlin/dev/meloda/fast/convos/ConvosViewModel.kt

@@ -8,12 +8,16 @@ import androidx.lifecycle.viewModelScope
 import coil.ImageLoader
 import coil.request.ImageRequest
 import com.conena.nanokt.collections.indexOfFirstOrNull
-import dev.meloda.fast.common.VkConstants
 import dev.meloda.fast.common.extensions.createTimerFlow
 import dev.meloda.fast.common.extensions.findWithIndex
 import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.extensions.launchDbRefresh
 import dev.meloda.fast.common.extensions.updateValue
+import dev.meloda.fast.common.paging.canPaginate as canPaginatePage
+import dev.meloda.fast.common.paging.isPaginationExhausted as isPaginationExhaustedPage
+import dev.meloda.fast.common.paging.loadingFlags
+import dev.meloda.fast.common.paging.mergePage
 import dev.meloda.fast.convos.model.ConvoDialog
 import dev.meloda.fast.convos.model.ConvoNavigation
 import dev.meloda.fast.convos.model.ConvosScreenState
@@ -23,8 +27,7 @@ import dev.meloda.fast.data.VkUtils
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.datastore.UserSettings
 import dev.meloda.fast.domain.ConvoUseCase
-import dev.meloda.fast.domain.LoadConvosByIdUseCase
+import dev.meloda.fast.domain.LongPollUpdatesReducer
-import dev.meloda.fast.domain.LongPollUpdatesParser
 import dev.meloda.fast.domain.MessagesUseCase
 import dev.meloda.fast.domain.util.asPresentation
 import dev.meloda.fast.domain.util.extractAvatar
@@ -40,20 +43,21 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
 
 class ConvosViewModel(
-    updatesParser: LongPollUpdatesParser,
+    updatesReducer: LongPollUpdatesReducer,
     private val filter: ConvosFilter,
     private val convoUseCase: ConvoUseCase,
     private val messagesUseCase: MessagesUseCase,
     private val resources: Resources,
     private val userSettings: UserSettings,
     private val imageLoader: ImageLoader,
-    private val applicationContext: Context,
+    private val applicationContext: Context
-    private val loadConvosByIdUseCase: LoadConvosByIdUseCase
 ) : ViewModel() {
     private val _screenState = MutableStateFlow(ConvosScreenState.EMPTY)
     val screenState = _screenState.asStateFlow()
@@ -94,15 +98,15 @@ class ConvosViewModel(
 
         loadConvos()
 
-        updatesParser.onNewMessage(::handleNewMessage)
+        updatesReducer.newMessages.onEach(::handleNewMessage).launchIn(viewModelScope)
-        updatesParser.onMessageEdited(::handleEditedMessage)
+        updatesReducer.messageEdited.onEach(::handleEditedMessage).launchIn(viewModelScope)
-        updatesParser.onMessageIncomingRead(::handleReadIncomingMessage)
+        updatesReducer.messageIncomingRead.onEach(::handleReadIncomingMessage).launchIn(viewModelScope)
-        updatesParser.onMessageOutgoingRead(::handleReadOutgoingMessage)
+        updatesReducer.messageOutgoingRead.onEach(::handleReadOutgoingMessage).launchIn(viewModelScope)
-        updatesParser.onInteractions(::handleInteraction)
+        updatesReducer.interactions.onEach(::handleInteraction).launchIn(viewModelScope)
-        updatesParser.onChatMajorChanged(::handleChatMajorChanged)
+        updatesReducer.chatMajorChanged.onEach(::handleChatMajorChanged).launchIn(viewModelScope)
-        updatesParser.onChatMinorChanged(::handleChatMinorChanged)
+        updatesReducer.chatMinorChanged.onEach(::handleChatMinorChanged).launchIn(viewModelScope)
-        updatesParser.onChatCleared(::handleChatClearing)
+        updatesReducer.chatCleared.onEach(::handleChatClearing).launchIn(viewModelScope)
-        updatesParser.onChatArchived(::handleChatArchived)
+        updatesReducer.chatArchived.onEach(::handleChatArchived).launchIn(viewModelScope)
 
         userSettings.useContactNames.listenValue(viewModelScope) {
             syncUiConvos()
@@ -253,6 +257,10 @@ class ConvosViewModel(
     private fun loadConvos(
         offset: Int = currentOffset.value
     ) {
+        if (offset == 0) {
+            refreshConvosFromDb()
+        }
+
         convoUseCase.getConvos(
             count = LOAD_COUNT,
             offset = offset,
@@ -264,17 +272,12 @@ class ConvosViewModel(
                     _baseError.update { newBaseError }
                 },
                 success = { response ->
-                    val convos = response
+                    val itemsCountSufficient = canPaginatePage(LOAD_COUNT, response.size)
-                    val fullConvos = if (offset == 0) {
+                    val paginationExhausted = isPaginationExhaustedPage(
-                        convos
+                        pageSize = LOAD_COUNT,
-                    } else {
+                        loadedCount = response.size,
-                        this.convos.value.plus(convos)
+                        hasExistingItems = this.convos.value.isNotEmpty()
-                    }
+                    )
-
-                    val itemsCountSufficient = response.size == LOAD_COUNT
-
-                    val paginationExhausted = !itemsCountSufficient &&
-                            this.convos.value.isNotEmpty()
 
                     _screenState.updateValue {
                         copy(isPaginationExhausted = paginationExhausted)
@@ -293,16 +296,17 @@ class ConvosViewModel(
 
                     convoUseCase.storeConvos(response)
 
-                    _convos.emit(fullConvos)
+                    _convos.emit(mergePage(this.convos.value, response, offset))
                     syncUiConvos()
                     _canPaginate.setValue { itemsCountSufficient }
                 }
             )
 
+            val flags = loadingFlags(offset, state.isLoading())
             _screenState.setValue { old ->
                 old.copy(
-                    isLoading = offset == 0 && state.isLoading(),
+                    isLoading = flags.isLoading,
-                    isPaginating = offset > 0 && state.isLoading()
+                    isPaginating = flags.isPaginating
                 )
             }
         }
@@ -313,14 +317,10 @@ class ConvosViewModel(
             state.processState(
                 error = {},
                 success = {
-                    val newConvos = convos.value.toMutableList()
+                    viewModelScope.launch {
-                    val convoIndex =
+                        convoUseCase.deleteLocalConvo(peerId)
-                        newConvos.indexOfFirstOrNull { it.id == peerId }
+                        refreshConvosFromDb()
-                            ?: return@processState
+                    }
-
-                    newConvos.removeAt(convoIndex)
-                    _convos.update { newConvos.sorted() }
-                    syncUiConvos()
                 }
             )
             _screenState.emit(screenState.value.copy(isLoading = state.isLoading()))
@@ -333,9 +333,11 @@ class ConvosViewModel(
                 state.processState(
                     error = {},
                     success = {
-                        handleChatMajorChanged(
+                        viewModelScope.launch {
-                            LongPollParsedEvent.ChatMajorChanged(
+                            convoUseCase.getLocalConvoById(peerId)?.let { convo ->
-                                peerId = peerId,
+                                convoUseCase.storeConvos(
+                                    listOf(
+                                        convo.copy(
                                             majorId = if (pin) {
                                                 pinnedConvosCount.value.plus(1) * 16
                                             } else {
@@ -343,6 +345,10 @@ class ConvosViewModel(
                                             }
                                         )
                                     )
+                                )
+                            }
+                            refreshConvosFromDb()
+                        }
                     }
                 )
 
@@ -356,145 +362,35 @@ class ConvosViewModel(
                 state.processState(
                     error = {},
                     success = {
-                        convos.value.find { it.id == peerId }?.let { convo ->
+                        viewModelScope.launch {
-                            handleChatArchived(
+                            convoUseCase.getLocalConvoById(peerId)?.let { convo ->
-                                LongPollParsedEvent.ChatArchived(
+                                convoUseCase.storeConvos(
-                                    convo = convo,
+                                    listOf(
-                                    archived = archive
+                                        convo.copy(isArchived = archive)
                                     )
                                 )
                             }
+                            refreshConvosFromDb()
+                        }
                     }
                 )
             }
     }
 
-    // TODO: 03-Apr-25, Danil Nikolaev: handle business messages
     private fun handleNewMessage(event: LongPollParsedEvent.NewMessage) {
-        val message = event.message
+        refreshConvosFromDb()
-
-        val newConvos = convos.value.toMutableList()
-        val convoIndex =
-            newConvos.indexOfFirstOrNull { it.id == message.peerId }
-
-        if (convoIndex == null) {
-            if (event.inArchive != (filter == ConvosFilter.ARCHIVE)) return
-
-            loadConvosByIdUseCase(
-                peerIds = listOf(message.peerId),
-                extended = true,
-                fields = VkConstants.ALL_FIELDS
-            ).listenValue(viewModelScope) { state ->
-                state.processState(
-                    error = {},
-                    success = { response ->
-                        val convo = (response.firstOrNull() ?: return@listenValue)
-                            .copy(lastMessage = message)
-
-                        newConvos.add(pinnedConvosCount.value, convo)
-                        _convos.update { newConvos.sorted() }
-                        syncUiConvos()
-                    }
-                )
-            }
-        } else {
-            val convo = newConvos[convoIndex]
-            var newConvo = convo.copy(
-                lastMessage = message,
-                lastMessageId = message.id,
-                lastCmId = message.cmId,
-                unreadCount = if (message.isOut) convo.unreadCount
-                else convo.unreadCount + 1
-            )
-
-            interactionsTimers[convo.id]?.let { job ->
-                if (job.interactionType == InteractionType.Typing
-                    && message.fromId in convo.interactionIds
-                ) {
-                    val newInteractionIds = newConvo.interactionIds.filter { id ->
-                        id != message.fromId
-                    }
-
-                    newConvo = newConvo.copy(
-                        interactionType = if (newInteractionIds.isEmpty()) -1 else {
-                            newConvo.interactionType
-                        },
-                        interactionIds = newInteractionIds
-                    )
-                }
-            }
-
-            if (convo.isPinned()) {
-                newConvos[convoIndex] = newConvo
-            } else {
-                newConvos.removeAt(convoIndex)
-
-                val toPosition = pinnedConvosCount.value
-                newConvos.add(toPosition, newConvo)
-            }
-
-            _convos.update { newConvos.sorted() }
-            syncUiConvos()
-        }
     }
 
     private fun handleEditedMessage(event: LongPollParsedEvent.MessageEdited) {
-        val message = event.message
+        refreshConvosFromDb()
-        val newConvos = convos.value.toMutableList()
-
-        val convoIndex = newConvos.indexOfFirstOrNull { it.id == message.peerId }
-        if (convoIndex == null) { // диалога нет в списке
-            //  pizdets
-        } else {
-            val convo = newConvos[convoIndex]
-            newConvos[convoIndex] = convo.copy(
-                lastMessage = message,
-                lastMessageId = message.id,
-                lastCmId = message.cmId
-            )
-            _convos.update { newConvos }
-            syncUiConvos()
-        }
     }
 
     private fun handleReadIncomingMessage(event: LongPollParsedEvent.IncomingMessageRead) {
-        val newConvos = convos.value.toMutableList()
+        refreshConvosFromDb()
-
-        val convoIndex =
-            newConvos.indexOfFirstOrNull { it.id == event.peerId }
-
-        if (convoIndex == null) { // диалога нет в списке
-            // pizdets
-        } else {
-            newConvos[convoIndex] =
-                newConvos[convoIndex].copy(
-                    inReadCmId = event.cmId,
-                    unreadCount = event.unreadCount
-                )
-
-            _convos.update { newConvos }
-            syncUiConvos()
-        }
     }
 
     private fun handleReadOutgoingMessage(event: LongPollParsedEvent.OutgoingMessageRead) {
-        val newConvos = convos.value.toMutableList()
+        refreshConvosFromDb()
-
-        val convoIndex =
-            newConvos.indexOfFirstOrNull { it.id == event.peerId }
-
-        if (convoIndex == null) { // диалога нет в списке
-            // pizdets
-        } else {
-            newConvos[convoIndex] =
-                newConvos[convoIndex].copy(
-                    outReadCmId = event.cmId,
-                    unreadCount = event.unreadCount
-                )
-
-            _convos.update { newConvos }
-            syncUiConvos()
-        }
     }
 
     private fun handleInteraction(event: LongPollParsedEvent.Interaction) {
@@ -563,88 +459,19 @@ class ConvosViewModel(
     }
 
     private fun handleChatMajorChanged(event: LongPollParsedEvent.ChatMajorChanged) {
-        val newConvos = convos.value.toMutableList()
+        refreshConvosFromDb()
-        val convoIndex =
-            newConvos.indexOfFirstOrNull { it.id == event.peerId }
-
-        if (convoIndex == null) { // диалога нет в списке
-            // pizdets
-        } else {
-            newConvos[convoIndex] =
-                newConvos[convoIndex].copy(majorId = event.majorId)
-
-            _convos.setValue { newConvos.sorted() }
-            syncUiConvos()
-        }
     }
 
     private fun handleChatMinorChanged(event: LongPollParsedEvent.ChatMinorChanged) {
-        val newConvos = convos.value.toMutableList()
+        refreshConvosFromDb()
-        val convoIndex =
-            newConvos.indexOfFirstOrNull { it.id == event.peerId }
-
-        if (convoIndex == null) { // диалога нет в списке
-            // pizdets
-        } else {
-            newConvos[convoIndex] =
-                newConvos[convoIndex].copy(minorId = event.minorId)
-
-            _convos.setValue { newConvos.sorted() }
-            syncUiConvos()
-        }
     }
 
     private fun handleChatClearing(event: LongPollParsedEvent.ChatCleared) {
-        val newConvos = convos.value.toMutableList()
+        refreshConvosFromDb()
-
-        val convoIndex = newConvos.indexOfFirstOrNull { it.id == event.peerId }
-
-        if (convoIndex == null) { // диалога нет в списке
-            // pizdets
-        } else {
-            newConvos.removeAt(convoIndex)
-
-            _convos.setValue { newConvos.sorted() }
-            syncUiConvos()
-        }
     }
 
     private fun handleChatArchived(event: LongPollParsedEvent.ChatArchived) {
-        val convo = event.convo
+        refreshConvosFromDb()
-
-        val newConvos = convos.value.toMutableList()
-
-        when (filter) {
-            ConvosFilter.BUSINESS_NOTIFY -> Unit
-
-            ConvosFilter.ARCHIVE -> {
-                if (event.archived) {
-                    newConvos.add(0, convo)
-                } else {
-                    val index = newConvos.indexOfFirstOrNull { it.id == convo.id }
-                    if (index == null) return
-
-                    newConvos.removeAt(index)
-                }
-
-                _convos.update { newConvos }
-                syncUiConvos()
-            }
-
-            else -> {
-                if (event.archived) {
-                    val index = newConvos.indexOfFirstOrNull { it.id == convo.id }
-                    if (index == null) return
-
-                    newConvos.removeAt(index)
-                } else {
-                    newConvos.add(pinnedConvosCount.value, convo)
-                }
-
-                _convos.update { newConvos.sorted() }
-                syncUiConvos()
-            }
-        }
     }
 
     private fun readConvo(peerId: Long, startMessageId: Long) {
@@ -655,21 +482,42 @@ class ConvosViewModel(
             state.processState(
                 error = {},
                 success = {
-                    val newConvos = convos.value.toMutableList()
+                    viewModelScope.launch {
-                    val convoIndex =
+                        convoUseCase.getLocalConvoById(peerId)?.let { convo ->
-                        newConvos.indexOfFirstOrNull { it.id == peerId }
+                            convoUseCase.storeConvos(
-                            ?: return@listenValue
+                                listOf(
-
+                                    convo.copy(
-                    newConvos[convoIndex] =
+                                        inRead = startMessageId,
-                        newConvos[convoIndex].copy(inRead = startMessageId)
+                                        unreadCount = 0
-
+                                    )
-                    _convos.update { newConvos }
+                                )
-                    syncUiConvos()
+                            )
+                        }
+                        refreshConvosFromDb()
+                    }
                 }
             )
         }
     }
 
+    private fun refreshConvosFromDb() {
+        viewModelScope.launchDbRefresh(
+            load = {
+            val localConvos = convoUseCase.getLocalConvos()
+
+            val filteredConvos = when (filter) {
+                ConvosFilter.ARCHIVE -> localConvos.filter(VkConvo::isArchived)
+                ConvosFilter.UNREAD -> localConvos.filter { !it.isArchived && it.unreadCount > 0 }
+                ConvosFilter.ALL -> localConvos.filterNot(VkConvo::isArchived)
+                ConvosFilter.BUSINESS_NOTIFY -> localConvos
+            }
+
+            _convos.emit(filteredConvos)
+        },
+            after = ::syncUiConvos
+        )
+    }
+
     private fun List<VkConvo>.sorted(): List<VkConvo> {
         val newConvos = toMutableList()
 

feature/convos/src/main/kotlin/dev/meloda/fast/convos/di/ConvosModule.kt

@@ -31,7 +31,6 @@ private fun Scope.createConvosViewModel(filter: ConvosFilter): ConvosViewModel {
         resources = get(),
         userSettings = get(),
         imageLoader = get(),
-        applicationContext = get(),
+        applicationContext = get()
-        loadConvosByIdUseCase = get()
     )
 }

feature/createchat/src/main/kotlin/dev/meloda/fast/convos/CreateChatViewModel.kt

@@ -7,9 +7,14 @@ import coil.ImageLoader
 import coil.request.ImageRequest
 import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.paging.canPaginate as canPaginatePage
+import dev.meloda.fast.common.paging.isPaginationExhausted as isPaginationExhaustedPage
+import dev.meloda.fast.common.paging.loadingFlags
+import dev.meloda.fast.common.paging.mergePage
 import dev.meloda.fast.convos.model.CreateChatScreenState
 import dev.meloda.fast.data.State
 import dev.meloda.fast.data.UserConfig
+import dev.meloda.fast.data.VkUtils
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.datastore.UserSettings
 import dev.meloda.fast.domain.FriendsUseCase
@@ -18,7 +23,6 @@ import dev.meloda.fast.domain.MessagesUseCase
 import dev.meloda.fast.domain.util.asPresentation
 import dev.meloda.fast.model.BaseError
 import dev.meloda.fast.model.api.domain.VkUser
-import dev.meloda.fast.network.VkErrorCode
 import dev.meloda.fast.ui.model.vk.UiFriend
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -156,11 +160,14 @@ class CreateChatViewModel(
                 state.processState(
                 error = ::handleError,
                 success = { response ->
-                        val itemsCountSufficient = response.size == LOAD_COUNT
+                    val itemsCountSufficient = canPaginatePage(LOAD_COUNT, response.size)
                     _canPaginate.setValue { itemsCountSufficient }
 
-                        val paginationExhausted = !itemsCountSufficient &&
+                    val paginationExhausted = isPaginationExhaustedPage(
-                                screenState.value.friends.isNotEmpty()
+                        pageSize = LOAD_COUNT,
+                        loadedCount = response.size,
+                        hasExistingItems = screenState.value.friends.isNotEmpty()
+                    )
 
                         val imagesToPreload =
                             response.mapNotNull { it.photo100.takeIf { p -> !p.isNullOrEmpty() } }
@@ -182,24 +189,19 @@ class CreateChatViewModel(
                         val newState = screenState.value.copy(
                             isPaginationExhausted = paginationExhausted
                         )
-                        if (offset == 0) {
-                            _screenState.setValue {
-                                newState.copy(friends = loadedFriends)
-                            }
-                        } else {
                         _screenState.setValue {
                             newState.copy(
-                                    friends = newState.friends.plus(loadedFriends)
+                                friends = mergePage(newState.friends, loadedFriends, offset)
                             )
                         }
                     }
-                    }
                 )
 
+                val flags = loadingFlags(offset, state.isLoading())
                 _screenState.setValue { old ->
                     old.copy(
-                        isLoading = offset == 0 && state.isLoading(),
+                        isLoading = flags.isLoading,
-                        isPaginating = offset > 0 && state.isLoading()
+                        isPaginating = flags.isPaginating
                     )
                 }
             }
@@ -228,40 +230,8 @@ class CreateChatViewModel(
     }
 
     private fun handleError(error: State.Error) {
-        when (error) {
+        VkUtils.parseError(error)?.let { newBaseError ->
-            is State.Error.ApiError -> {
+            _baseError.setValue { newBaseError }
-                when (error.errorCode) {
-                    VkErrorCode.USER_AUTHORIZATION_FAILED -> {
-                        _baseError.setValue { BaseError.SessionExpired }
-                    }
-
-                    else -> {
-                        _baseError.setValue {
-                            BaseError.SimpleError(message = error.errorMessage)
-                        }
-                    }
-                }
-            }
-
-            State.Error.ConnectionError -> {
-                _baseError.setValue {
-                    BaseError.SimpleError(message = "Connection error")
-                }
-            }
-
-            State.Error.InternalError -> {
-                _baseError.setValue {
-                    BaseError.SimpleError(message = "Internal error")
-                }
-            }
-
-            State.Error.UnknownError -> {
-                _baseError.setValue {
-                    BaseError.SimpleError(message = "Unknown error")
-                }
-            }
-
-            else -> Unit
         }
     }
 

feature/friends/src/main/kotlin/dev/meloda/fast/friends/FriendsViewModel.kt

@@ -4,7 +4,12 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.paging.canPaginate as canPaginatePage
+import dev.meloda.fast.common.paging.isPaginationExhausted as isPaginationExhaustedPage
+import dev.meloda.fast.common.paging.loadingFlags
+import dev.meloda.fast.common.paging.mergePage
 import dev.meloda.fast.data.State
+import dev.meloda.fast.data.VkUtils
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.datastore.UserSettings
 import dev.meloda.fast.domain.FriendsUseCase
@@ -13,7 +18,6 @@ import dev.meloda.fast.domain.util.asPresentation
 import dev.meloda.fast.friends.model.FriendsScreenState
 import dev.meloda.fast.model.BaseError
 import dev.meloda.fast.model.api.domain.VkUser
-import dev.meloda.fast.network.VkErrorCode
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
@@ -80,40 +84,8 @@ abstract class BaseFriendsViewModelImpl : ViewModel(), FriendsViewModel {
     abstract fun loadFriends(offset: Int = currentOffset.value)
 
     protected fun handleError(error: State.Error) {
-        when (error) {
+        VkUtils.parseError(error)?.let { newBaseError ->
-            is State.Error.ApiError -> {
+            baseError.setValue { newBaseError }
-                when (error.errorCode) {
-                    VkErrorCode.USER_AUTHORIZATION_FAILED -> {
-                        baseError.setValue { BaseError.SessionExpired }
-                    }
-
-                    else -> {
-                        baseError.setValue {
-                            BaseError.SimpleError(message = error.errorMessage)
-                        }
-                    }
-                }
-            }
-
-            State.Error.ConnectionError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Connection error")
-                }
-            }
-
-            State.Error.InternalError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Internal error")
-                }
-            }
-
-            State.Error.UnknownError -> {
-                baseError.setValue {
-                    BaseError.SimpleError(message = "Unknown error")
-                }
-            }
-
-            else -> Unit
         }
     }
 
@@ -154,11 +126,14 @@ class FriendsViewModelImpl(
             state.processState(
                 error = ::handleError,
                 success = { response ->
-                    val itemsCountSufficient = response.size == LOAD_COUNT
+                    val itemsCountSufficient = canPaginatePage(LOAD_COUNT, response.size)
                     canPaginate.setValue { itemsCountSufficient }
 
-                    val paginationExhausted = !itemsCountSufficient
+                    val paginationExhausted = isPaginationExhaustedPage(
-                            && screenState.value.friends.isNotEmpty()
+                        pageSize = LOAD_COUNT,
+                        loadedCount = response.size,
+                        hasExistingItems = screenState.value.friends.isNotEmpty()
+                    )
 
                     imagesToPreload.setValue {
                         response.mapNotNull(VkUser::photo100)
@@ -174,24 +149,20 @@ class FriendsViewModelImpl(
                         isPaginationExhausted = paginationExhausted
                     )
 
-                    if (offset == 0) {
+                    friends.emit(mergePage(friends.value, response, offset))
-                        friends.emit(response)
                     screenState.setValue {
-                            newState.copy(friends = loadedFriends)
+                        newState.copy(
-                        }
+                            friends = mergePage(newState.friends, loadedFriends, offset)
-                    } else {
+                        )
-                        friends.emit(friends.value.plus(response))
-                        screenState.setValue {
-                            newState.copy(friends = newState.friends.plus(loadedFriends))
-                        }
                     }
                 }
             )
 
+            val flags = loadingFlags(offset, state.isLoading())
             screenState.setValue { old ->
                 old.copy(
-                    isLoading = offset == 0 && state.isLoading(),
+                    isLoading = flags.isLoading,
-                    isPaginating = offset > 0 && state.isLoading()
+                    isPaginating = flags.isPaginating
                 )
             }
         }
@@ -229,10 +200,14 @@ class OnlineFriendsViewModelImpl(
                                 }
                             )
 
+                            val flags = loadingFlags(
+                                offset = offset,
+                                isLoading = onlineState.isLoading() || state.isLoading()
+                            )
                             screenState.setValue { old ->
                                 old.copy(
-                                    isLoading = offset == 0 && (onlineState.isLoading() || state.isLoading()),
+                                    isLoading = flags.isLoading,
-                                    isPaginating = offset > 0 && (onlineState.isLoading() || state.isLoading())
+                                    isPaginating = flags.isPaginating
                                 )
                             }
                         }

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryInteractionHandler.kt

@@ -0,0 +1,267 @@
+package dev.meloda.fast.messageshistory
+
+import android.os.Bundle
+import com.conena.nanokt.collections.indexOfFirstOrNull
+import dev.meloda.fast.common.extensions.getParcelableCompat
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.messageshistory.model.MessageDialog
+import dev.meloda.fast.messageshistory.model.MessageOption
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.api.domain.VkMessage
+import dev.meloda.fast.ui.model.vk.MessageUiItem
+import kotlinx.coroutines.flow.MutableStateFlow
+
+internal class MessagesHistoryInteractionHandler(
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val dialog: MutableStateFlow<MessageDialog?>,
+    private val selectedMessages: MutableStateFlow<List<VkMessage>>,
+    private val uiMessages: MutableStateFlow<List<MessageUiItem>>,
+    private val isNeedToScrollToIndex: MutableStateFlow<Int?>,
+    private val messageActions: MessagesHistoryMessageActions,
+    private val messageTransportActions: MessagesHistoryMessageTransportActions,
+    private val syncUiMessages: () -> Unit
+) {
+    fun onDialogConfirmed(dialog: MessageDialog, bundle: Bundle) {
+        onDialogDismissed(dialog)
+
+        when (dialog) {
+            is MessageDialog.MessageOptions -> Unit
+
+            is MessageDialog.MessageDelete -> {
+                val deleteForEveryone = bundle.getBoolean("everyone")
+
+                if (dialog.message.id <= 0) {
+                    val newMessages = messages.value.toMutableList()
+                    newMessages.remove(dialog.message)
+                    messages.setValue { newMessages }
+                    syncUiMessages()
+                    return
+                }
+
+                messageTransportActions.deleteMessage(
+                    messageIds = listOf(dialog.message.id),
+                    deleteForAll = deleteForEveryone
+                )
+            }
+
+            is MessageDialog.MessagesDelete -> {
+                val deleteForEveryone = bundle.getBoolean("everyone")
+
+                val failedMessages = dialog.messages.filter { it.id <= 0 }
+                val messageIdsToDelete =
+                    dialog.messages
+                        .filter { it.id > 0 }
+                        .map(VkMessage::id)
+
+                messageTransportActions.deleteMessage(
+                    messageIds = messageIdsToDelete,
+                    deleteForAll = deleteForEveryone,
+                    onSuccess = {
+                        val newMessages = messages.value.toMutableList()
+                        newMessages.removeAll(failedMessages)
+                        messages.setValue { newMessages }
+                        selectedMessages.setValue { emptyList() }
+                        syncUiMessages()
+                    }
+                )
+            }
+
+            is MessageDialog.MessagePin -> {
+                messageTransportActions.pinMessage(dialog.messageId)
+            }
+
+            is MessageDialog.MessageUnpin -> {
+                messageTransportActions.unpinMessage(dialog.messageId)
+            }
+
+            is MessageDialog.MessageMarkImportance -> {
+                messageTransportActions.markAsImportant(
+                    messageIds = listOf(dialog.message.id),
+                    important = dialog.isImportant
+                )
+            }
+
+            is MessageDialog.MessageSpam -> {
+                if (dialog.isSpam) {
+                    messageTransportActions.deleteMessage(
+                        messageIds = listOf(dialog.message.id),
+                        spam = true
+                    )
+                } else {
+                    // TODO: 29-Mar-25, Danil Nikolaev: report as not spam
+                }
+            }
+        }
+    }
+
+    fun onDialogDismissed(dialog: MessageDialog) {
+        this.dialog.setValue { null }
+    }
+
+    fun onDialogItemPicked(dialog: MessageDialog, bundle: Bundle) {
+        when (dialog) {
+            is MessageDialog.MessageOptions -> {
+                val cmId = bundle.getLong("cmId")
+
+                when (val option = bundle.getParcelableCompat("option", MessageOption::class)) {
+                    null -> Unit
+
+                    MessageOption.Retry -> {
+                        // TODO: 28-Mar-25, Danil Nikolaev: retry sending
+                    }
+
+                    MessageOption.Reply -> messageActions.replyToMessage(cmId)
+
+                    MessageOption.ForwardHere -> {
+
+                    }
+
+                    MessageOption.Forward -> {
+
+                    }
+
+                    MessageOption.Pin -> {
+                        this.dialog.setValue {
+                            MessageDialog.MessagePin(dialog.message.id)
+                        }
+                    }
+
+                    MessageOption.Unpin -> {
+                        this.dialog.setValue {
+                            MessageDialog.MessageUnpin(dialog.message.id)
+                        }
+                    }
+
+                    MessageOption.Read -> {
+                        messageTransportActions.readMessage(dialog.message)
+                    }
+
+                    MessageOption.Copy -> {
+                        messageTransportActions.copyMessage(dialog.message)
+                    }
+
+                    MessageOption.MarkAsImportant,
+                    MessageOption.UnmarkAsImportant -> {
+                        this.dialog.setValue {
+                            MessageDialog.MessageMarkImportance(
+                                message = dialog.message,
+                                isImportant = option is MessageOption.MarkAsImportant
+                            )
+                        }
+                    }
+
+                    MessageOption.MarkAsSpam,
+                    MessageOption.UnmarkAsSpam -> {
+                        this.dialog.setValue {
+                            MessageDialog.MessageSpam(
+                                message = dialog.message,
+                                isSpam = option is MessageOption.MarkAsSpam
+                            )
+                        }
+                    }
+
+                    MessageOption.Edit -> {
+                        messageActions.editMessage(cmId)
+                        syncUiMessages()
+                    }
+
+                    MessageOption.Delete -> {
+                        this.dialog.setValue {
+                            MessageDialog.MessageDelete(dialog.message)
+                        }
+                    }
+                }
+            }
+
+            is MessageDialog.MessageDelete -> Unit
+            is MessageDialog.MessageUnpin -> Unit
+            is MessageDialog.MessageMarkImportance -> Unit
+            is MessageDialog.MessageSpam -> Unit
+            is MessageDialog.MessagePin -> Unit
+            is MessageDialog.MessagesDelete -> Unit
+        }
+    }
+
+    fun onCloseButtonClicked() {
+        if (selectedMessages.value.isNotEmpty()) {
+            selectedMessages.setValue { emptyList() }
+        }
+
+        if (screenState.value.editCmId != null) {
+            messageActions.stopEditMessage()
+        }
+
+        syncUiMessages()
+    }
+
+    fun onMessageClicked(messageId: Long) {
+        val currentMessage = messages.value.firstOrNull { it.id == messageId } ?: return
+
+        if (selectedMessages.value.isNotEmpty()) {
+            val isSelected = selectedMessages.value.contains(currentMessage)
+
+            selectedMessages.setValue { old ->
+                old.toMutableList().also {
+                    if (isSelected) {
+                        it.remove(currentMessage)
+                    } else {
+                        it.add(currentMessage)
+                    }
+                }
+            }
+            syncUiMessages()
+        } else {
+            dialog.setValue {
+                MessageDialog.MessageOptions(currentMessage)
+            }
+        }
+    }
+
+    fun onMessageLongClicked(messageId: Long) {
+        val currentMessage = messages.value.firstOrNull { it.id == messageId } ?: return
+
+        val isSelected = selectedMessages.value.contains(currentMessage)
+        if (isSelected) return
+
+        selectedMessages.setValue { old ->
+            old.toMutableList().also {
+                it.add(currentMessage)
+            }
+        }
+        syncUiMessages()
+    }
+
+    fun onEditSelectedMessageClicked() {
+        val cmId = selectedMessages.value.firstOrNull()?.cmId ?: return
+
+        selectedMessages.setValue { emptyList() }
+
+        messageActions.editMessage(cmId)
+
+        syncUiMessages()
+    }
+
+    fun onDeleteSelectedMessagesClicked() {
+        dialog.setValue {
+            MessageDialog.MessagesDelete(selectedMessages.value)
+        }
+    }
+
+    fun onPinnedMessageClicked(messageId: Long) {
+        val messageIndex = uiMessages.value.indexOfFirstOrNull {
+            it is MessageUiItem.Message && it.id == messageId
+        }
+
+        if (messageIndex != null) {
+            isNeedToScrollToIndex.setValue { messageIndex }
+        }
+    }
+
+    fun onUnpinMessageClicked() {
+        val pinnedMessageId = screenState.value.pinnedMessage?.id ?: return
+        dialog.setValue {
+            MessageDialog.MessageUnpin(pinnedMessageId)
+        }
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryLoaders.kt

@@ -0,0 +1,179 @@
+package dev.meloda.fast.messageshistory
+
+import android.util.Log
+import dev.meloda.fast.common.VkConstants
+import dev.meloda.fast.common.extensions.listenValue
+import dev.meloda.fast.common.extensions.launchDbRefresh
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.paging.canPaginate as canPaginatePage
+import dev.meloda.fast.common.paging.isPaginationExhausted as isPaginationExhaustedPage
+import dev.meloda.fast.common.paging.loadingFlags
+import dev.meloda.fast.common.paging.mergePage
+import dev.meloda.fast.common.provider.ResourceProvider
+import dev.meloda.fast.data.State
+import dev.meloda.fast.data.VkUtils
+import dev.meloda.fast.data.processState
+import dev.meloda.fast.datastore.AppSettings
+import dev.meloda.fast.domain.ConvoUseCase
+import dev.meloda.fast.domain.MessagesUseCase
+import dev.meloda.fast.domain.util.extractAvatar
+import dev.meloda.fast.domain.util.extractTitle
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.BaseError
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.MutableStateFlow
+
+internal class MessagesHistoryLoaders(
+    private val convoUseCase: ConvoUseCase,
+    private val messagesUseCase: MessagesUseCase,
+    private val resourceProvider: ResourceProvider,
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val imagesToPreload: MutableStateFlow<List<String>>,
+    private val canPaginate: MutableStateFlow<Boolean>,
+    private val baseError: MutableStateFlow<BaseError?>,
+    private val scope: CoroutineScope,
+    private val syncUiMessages: () -> Unit,
+    private val onPinnedMessage: (VkMessage?) -> Unit,
+) {
+    fun loadConvo() {
+        Log.d("MessagesHistoryViewModelImpl", "loadConvo()")
+
+        scope.launchDbRefresh(
+            load = {
+                convoUseCase.getLocalConvoById(screenState.value.convoId)?.let { convo ->
+                    val title = convo.extractTitle(
+                        useContactName = AppSettings.General.useContactNames,
+                        resources = resourceProvider.resources
+                    )
+                    val avatar = convo.extractAvatar()
+
+                    screenState.setValue { old ->
+                        old.copy(
+                            convo = convo,
+                            title = title,
+                            avatar = avatar
+                        )
+                    }
+
+                    onPinnedMessage(convo.pinnedMessage)
+                }
+            },
+            after = {}
+        )
+
+        convoUseCase.getById(
+            peerIds = listOf(screenState.value.convoId),
+            extended = true,
+            fields = VkConstants.ALL_FIELDS
+        ).listenValue(scope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = { response ->
+                    val convo = response.firstOrNull() ?: return@listenValue
+                    val title = convo.extractTitle(
+                        useContactName = AppSettings.General.useContactNames,
+                        resources = resourceProvider.resources
+                    )
+                    val avatar = convo.extractAvatar()
+
+                    screenState.setValue { old ->
+                        old.copy(
+                            convo = convo,
+                            title = title,
+                            avatar = avatar
+                        )
+                    }
+
+                    onPinnedMessage(convo.pinnedMessage)
+                }
+            )
+        }
+    }
+
+    fun loadMessagesHistory(offset: Int) {
+        Log.d("MessagesHistoryViewModel", "loadMessagesHistory: $offset")
+
+        if (offset == 0) {
+            scope.launchDbRefresh(
+                load = {
+                    val cachedMessages = messagesUseCase.getLocalMessages(screenState.value.convoId)
+                    if (cachedMessages.isNotEmpty()) {
+                        messages.emit(cachedMessages.sorted())
+                    }
+                },
+                after = {
+                    if (messages.value.isNotEmpty()) {
+                        syncUiMessages()
+                    }
+                }
+            )
+        }
+
+        messagesUseCase.getMessagesHistory(
+            convoId = screenState.value.convoId,
+            count = MessagesHistoryViewModelImpl.MESSAGES_LOAD_COUNT,
+            offset = offset,
+        ).listenValue(scope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = { response ->
+                    val messages = response.messages
+                    val fullMessages = mergePage(this.messages.value, messages, offset)
+                        .sorted()
+
+                    imagesToPreload.setValue {
+                        messages.mapNotNull { it.extractAvatar().extractUrl() }
+                    }
+
+                    messagesUseCase.storeMessages(messages)
+                    convoUseCase.storeConvos(response.convos)
+
+                    val itemsCountSufficient = canPaginatePage(
+                        MessagesHistoryViewModelImpl.MESSAGES_LOAD_COUNT,
+                        messages.size
+                    )
+                    val paginationExhausted = isPaginationExhaustedPage(
+                        pageSize = MessagesHistoryViewModelImpl.MESSAGES_LOAD_COUNT,
+                        loadedCount = messages.size,
+                        hasExistingItems = this.messages.value.isNotEmpty()
+                    )
+                    screenState.setValue { old ->
+                        old.copy(isPaginationExhausted = paginationExhausted)
+                    }
+
+                    this.messages.emit(fullMessages)
+                    syncUiMessages()
+                    canPaginate.setValue { itemsCountSufficient }
+                }
+            )
+
+            val flags = loadingFlags(offset, state.isLoading())
+            screenState.setValue { old ->
+                old.copy(
+                    isLoading = flags.isLoading,
+                    isPaginating = flags.isPaginating
+                )
+            }
+        }
+    }
+
+    private fun handleError(error: State.Error) {
+        VkUtils.parseError(error)?.let { newBaseError ->
+            baseError.setValue { newBaseError }
+        }
+    }
+
+    private fun List<VkMessage>.sorted(): List<VkMessage> {
+        return sortedWith { m1, m2 ->
+            val dateDiff = m2.date - m1.date
+            if (dateDiff != 0) {
+                dateDiff
+            } else {
+                val idDiff = m2.id - m1.id
+                idDiff.toInt()
+            }
+        }
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryLongPollEventHandler.kt

@@ -0,0 +1,99 @@
+package dev.meloda.fast.messageshistory
+
+import android.util.Log
+import dev.meloda.fast.common.extensions.launchDbRefresh
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.domain.ConvoUseCase
+import dev.meloda.fast.domain.MessagesUseCase
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.LongPollParsedEvent
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.MutableStateFlow
+
+internal class MessagesHistoryLongPollEventHandler(
+    private val scope: CoroutineScope,
+    private val convoUseCase: ConvoUseCase,
+    private val messagesUseCase: MessagesUseCase,
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val syncUiMessages: () -> Unit,
+    private val onPinnedMessageChanged: (VkMessage?) -> Unit
+) {
+    fun onNewMessage(event: LongPollParsedEvent.NewMessage) {
+        val message = event.message
+
+        Log.d("MessagesHistoryViewModel", "handleNewMessage: $message")
+
+        if (message.peerId != screenState.value.convoId) return
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onMessageEdited(event: LongPollParsedEvent.MessageEdited) {
+        val message = event.message
+        if (message.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onReadIncoming(event: LongPollParsedEvent.IncomingMessageRead) {
+        if (event.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = false)
+    }
+
+    fun onReadOutgoing(event: LongPollParsedEvent.OutgoingMessageRead) {
+        if (event.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = false)
+    }
+
+    fun onMessageDeleted(event: LongPollParsedEvent.MessageDeleted) {
+        if (event.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onMessageRestored(event: LongPollParsedEvent.MessageRestored) {
+        if (event.message.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onMessageMarkedAsImportant(event: LongPollParsedEvent.MessageMarkedAsImportant) {
+        if (event.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onMessageMarkedAsSpam(event: LongPollParsedEvent.MessageMarkedAsSpam) {
+        if (event.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    fun onMessageMarkedAsNotSpam(event: LongPollParsedEvent.MessageMarkedAsNotSpam) {
+        if (event.message.peerId != screenState.value.convoId) return
+
+        refreshFromDb(refreshMessages = true)
+    }
+
+    private fun refreshFromDb(refreshMessages: Boolean) {
+        scope.launchDbRefresh(
+            load = {
+                convoUseCase.getLocalConvoById(screenState.value.convoId)?.let { convo ->
+                    screenState.setValue { old ->
+                        old.copy(convo = convo)
+                    }
+                    onPinnedMessageChanged(convo.pinnedMessage)
+                }
+
+                if (refreshMessages) {
+                    val localMessages = messagesUseCase.getLocalMessages(screenState.value.convoId)
+                    messages.setValue { localMessages }
+                }
+            },
+            after = ::syncUiMessages
+        )
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryMessageActions.kt

@@ -0,0 +1,23 @@
+package dev.meloda.fast.messageshistory
+
+import androidx.compose.ui.text.input.TextFieldValue
+
+internal class MessagesHistoryMessageActions(
+    private val sendEditActions: MessagesHistoryMessageSendEditActions
+) {
+    fun replyToMessage(cmId: Long) = sendEditActions.replyToMessage(cmId)
+    fun onMessageInputChanged(newText: TextFieldValue) = sendEditActions.onMessageInputChanged(newText)
+    fun onEmojiButtonLongClicked() = sendEditActions.onEmojiButtonLongClicked()
+    fun editMessage(cmId: Long) = sendEditActions.editMessage(cmId)
+    fun stopEditMessage() = sendEditActions.stopEditMessage()
+    fun onBoldClicked() = sendEditActions.onBoldClicked()
+    fun onItalicClicked() = sendEditActions.onItalicClicked()
+    fun onUnderlineClicked() = sendEditActions.onUnderlineClicked()
+    fun onRegularClicked() = sendEditActions.onRegularClicked()
+    fun onActionButtonClicked() = sendEditActions.onActionButtonClicked()
+    fun onReplyCloseClicked() = sendEditActions.onReplyCloseClicked()
+    fun onKeyboardShown() = sendEditActions.onKeyboardShown()
+    fun sendMessage() = sendEditActions.sendMessage()
+    fun confirmDeleteCurrentEditMessage() = sendEditActions.confirmDeleteCurrentEditMessage()
+    fun editCurrentEditMessage() = sendEditActions.editCurrentEditMessage()
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryMessageSendEditActions.kt

@@ -0,0 +1,400 @@
+package dev.meloda.fast.messageshistory
+
+import android.util.Log
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.text.style.TextDecoration
+import dev.meloda.fast.common.extensions.listenValue
+import dev.meloda.fast.common.extensions.launchDbRefresh
+import dev.meloda.fast.common.extensions.removeIfCompat
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.common.provider.ResourceProvider
+import dev.meloda.fast.data.UserConfig
+import dev.meloda.fast.data.VkMemoryCache
+import dev.meloda.fast.datastore.AppSettings
+import dev.meloda.fast.data.processState
+import dev.meloda.fast.domain.MessagesUseCase
+import dev.meloda.fast.domain.util.extractReplySummary
+import dev.meloda.fast.domain.util.extractReplyTitle
+import dev.meloda.fast.domain.util.extractTitle
+import dev.meloda.fast.messageshistory.model.ActionMode
+import dev.meloda.fast.messageshistory.model.MessageDialog
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.api.domain.FormatDataType
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
+import kotlin.random.Random
+
+internal class MessagesHistoryMessageSendEditActions(
+    private val viewModelScope: CoroutineScope,
+    private val messagesUseCase: MessagesUseCase,
+    private val resourceProvider: ResourceProvider,
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val showKeyboard: MutableStateFlow<Boolean>,
+    private val dialog: MutableStateFlow<MessageDialog?>,
+    private val syncUiMessages: () -> Unit
+) {
+    private var lastMessageText: String? = null
+    private val sendingMessages: MutableList<VkMessage> = mutableListOf()
+    private val failedMessages: MutableList<VkMessage> = mutableListOf()
+    private var replyToCmId: Long? = null
+    private var editMessage: VkMessage? = null
+    private var formatData = VkMessage.FormatData("1", emptyList())
+
+    fun replyToMessage(cmId: Long) {
+        val messageToReply = messages.value.find { it.cmId == cmId } ?: return
+
+        showKeyboard.setValue { true }
+        replyToCmId = cmId
+        screenState.setValue { old ->
+            old.copy(
+                replyTitle = messageToReply.extractTitle(),
+                replyText = messageToReply.extractReplySummary(resourceProvider.resources)
+            )
+        }
+    }
+
+    fun onMessageInputChanged(newText: TextFieldValue) {
+        screenState.setValue { old ->
+            old.copy(
+                message = newText,
+                actionMode =
+                    when {
+                        screenState.value.editCmId != null -> {
+                            // TODO: 13/03/2026, Danil Nikolaev: also check if attachments is empty
+                            if (newText.text.trim().isEmpty()) {
+                                ActionMode.DELETE
+                            } else {
+                                ActionMode.EDIT
+                            }
+                        }
+
+                        newText.text.trim().isEmpty() -> ActionMode.RECORD_AUDIO
+                        else -> ActionMode.SEND
+                    }
+            )
+        }
+        updateStyles()
+    }
+
+    fun onEmojiButtonLongClicked() {
+        AppSettings.Features.fastText.takeIf { it.isNotBlank() }?.let { text ->
+            val newText = "${screenState.value.message.text}$text"
+            onMessageInputChanged(
+                TextFieldValue(text = newText, selection = TextRange(newText.length))
+            )
+        }
+    }
+
+    fun editMessage(cmId: Long) {
+        screenState.setValue { old -> old.copy(editCmId = cmId) }
+
+        val messageToEdit = messages.value.firstOrNull { it.cmId == cmId } ?: return
+        editMessage = messageToEdit
+
+        lastMessageText = screenState.value.message.text
+
+        var newState = screenState.value.copy(
+            message = TextFieldValue(
+                text = messageToEdit.text.orEmpty(),
+                selection = TextRange(messageToEdit.text.orEmpty().length)
+            ),
+            actionMode = ActionMode.EDIT
+        )
+
+        messageToEdit.replyMessage?.let { reply ->
+            replyToCmId = reply.cmId
+            newState = newState.copy(
+                replyTitle = reply.extractReplyTitle(),
+                replyText = reply.extractReplySummary(resourceProvider.resources)
+            )
+        }
+
+        showKeyboard.setValue { true }
+        screenState.setValue { newState }
+    }
+
+    fun stopEditMessage() {
+        val lastText = lastMessageText.orEmpty().trim()
+
+        screenState.setValue { old ->
+            old.copy(
+                editCmId = null,
+                message = TextFieldValue(
+                    text = lastText,
+                    selection = TextRange(lastText.length)
+                ),
+                actionMode = if (lastText.isBlank()) ActionMode.RECORD_AUDIO else ActionMode.SEND,
+                replyTitle = null,
+                replyText = null
+            )
+        }
+    }
+
+    fun onBoldClicked() = updateFormatting(FormatDataType.BOLD)
+    fun onItalicClicked() = updateFormatting(FormatDataType.ITALIC)
+    fun onUnderlineClicked() = updateFormatting(FormatDataType.UNDERLINE)
+
+    fun onRegularClicked() {
+        formatData = formatData.copy(items = emptyList())
+        updateStyles()
+    }
+
+    fun onActionButtonClicked() {
+        when (screenState.value.actionMode) {
+            ActionMode.DELETE -> confirmDeleteCurrentEditMessage()
+            ActionMode.EDIT -> editCurrentEditMessage()
+            ActionMode.RECORD_AUDIO -> {
+                screenState.setValue { it.copy(actionMode = ActionMode.RECORD_VIDEO) }
+            }
+            ActionMode.RECORD_VIDEO -> {
+                screenState.setValue { it.copy(actionMode = ActionMode.RECORD_AUDIO) }
+            }
+            ActionMode.SEND -> sendMessage()
+        }
+    }
+
+    fun onReplyCloseClicked() {
+        replyToCmId = null
+        screenState.setValue { old ->
+            old.copy(
+                replyTitle = null,
+                replyText = null
+            )
+        }
+    }
+
+    fun onKeyboardShown() {
+        showKeyboard.setValue { false }
+    }
+
+    fun sendMessage() {
+        lastMessageText = screenState.value.message.text
+
+        val newMessage = VkMessage(
+            id = -1L - sendingMessages.size,
+            cmId = -1L - sendingMessages.size,
+            text = lastMessageText,
+            isOut = true,
+            peerId = screenState.value.convoId,
+            fromId = UserConfig.userId,
+            date = (System.currentTimeMillis() / 1000).toInt(),
+            randomId = Random.nextInt().toLong(),
+            action = null,
+            actionMemberId = null,
+            actionText = null,
+            actionCmId = null,
+            actionMessage = null,
+            updateTime = null,
+            isImportant = false,
+            forwards = null,
+            attachments = null,
+            replyMessage = when {
+                replyToCmId != null -> messages.value.find { it.cmId == replyToCmId }
+                else -> null
+            },
+            geoType = null,
+            user = VkMemoryCache.getUser(UserConfig.userId),
+            group = null,
+            actionUser = null,
+            actionGroup = null,
+            isPinned = false,
+            isSpam = false,
+            pinnedAt = null,
+            formatData = formatData,
+        )
+        formatData = formatData.copy(items = emptyList())
+        sendingMessages += newMessage
+        messages.setValue { old -> listOf(newMessage).plus(old) }
+        syncUiMessages()
+
+        screenState.setValue { old ->
+            old.copy(
+                message = TextFieldValue(),
+                actionMode = ActionMode.RECORD_AUDIO,
+                replyTitle = null,
+                replyText = null
+            )
+        }
+
+        val replyCmId = replyToCmId
+        replyToCmId = null
+
+        val forward = when {
+            replyCmId != null -> {
+                buildJsonObject {
+                    put("peer_id", screenState.value.convoId)
+                    put("conversation_message_ids", buildJsonArray { add(replyCmId) })
+                    put("is_reply", true)
+                }.toString()
+            }
+
+            else -> null
+        }
+
+        messagesUseCase.sendMessage(
+            peerId = screenState.value.convoId,
+            randomId = newMessage.randomId,
+            message = newMessage.text,
+            forward = forward,
+            attachments = null,
+            formatData = newMessage.formatData,
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                any = { sendingMessages.remove(newMessage) },
+                error = { error ->
+                    Log.d("MessagesHistoryViewModelImpl", "sendMessage: ERROR: $error")
+
+                    val failedId = -500_000L - failedMessages.size
+                    val newFailedMessage = newMessage.copy(id = failedId)
+                    failedMessages += newFailedMessage
+
+                    val newMessages = messages.value.toMutableList()
+                    newMessages[newMessages.indexOf(newMessage)] = newFailedMessage
+                    messages.setValue { newMessages }
+                    syncUiMessages()
+                },
+                success = { response ->
+                    viewModelScope.launch {
+                        messagesUseCase.storeMessage(
+                            newMessage.copy(
+                                id = response.messageId,
+                                cmId = response.cmId
+                            )
+                        )
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun confirmDeleteCurrentEditMessage() {
+        val currentMessage = editMessage ?: return
+        dialog.setValue { MessageDialog.MessageDelete(currentMessage) }
+    }
+
+    fun editCurrentEditMessage() {
+        val newText = screenState.value.message.text
+        val lastText = lastMessageText.orEmpty().trim()
+        val currentReplyToCmId = replyToCmId
+
+        screenState.setValue { old ->
+            old.copy(
+                editCmId = null,
+                message = TextFieldValue(
+                    text = lastText,
+                    selection = TextRange(lastText.length)
+                ),
+                actionMode = if (lastText.isBlank()) ActionMode.RECORD_AUDIO else ActionMode.SEND,
+                replyTitle = null,
+                replyText = null
+            )
+        }
+
+        syncUiMessages()
+
+        val newMessage = editMessage?.copy(
+            replyMessage = if (currentReplyToCmId == null) null else editMessage?.replyMessage,
+            text = newText
+        ) ?: return
+
+        Log.d("MessagesHistoryViewModelImpl", "editMessage: $newMessage")
+
+        messagesUseCase.edit(
+            peerId = screenState.value.convoId,
+            cmId = newMessage.cmId,
+            message = newMessage.text,
+            attachments = null,
+            formatData = newMessage.formatData
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                error = { error ->
+                    Log.d("MessagesHistoryViewModelImpl", "editMessage: ERROR: $error")
+                },
+                success = {
+                    viewModelScope.launch {
+                        messagesUseCase.storeMessage(newMessage)
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+
+        replyToCmId = null
+    }
+
+    private fun updateFormatting(type: FormatDataType) {
+        val selectionRange = screenState.value.message.selection
+        val newItems = formatData.items.toMutableList()
+        val wasRemoved = newItems.removeIfCompat {
+            it.type == type &&
+                it.offset == selectionRange.start &&
+                it.offset + it.length == selectionRange.end
+        }
+
+        if (!wasRemoved) {
+            newItems += VkMessage.FormatData.Item(
+                offset = selectionRange.start,
+                length = selectionRange.end - selectionRange.start,
+                type = type,
+                url = null
+            )
+        }
+
+        formatData = formatData.copy(items = newItems)
+        updateStyles()
+    }
+
+    private fun updateStyles() {
+        val annotations =
+            mutableListOf<AnnotatedString.Range<out AnnotatedString.Annotation>>()
+
+        formatData.items.forEach { item ->
+            val spanStyle = when (item.type) {
+                FormatDataType.BOLD -> SpanStyle(fontWeight = FontWeight.SemiBold)
+                FormatDataType.ITALIC -> SpanStyle(fontStyle = FontStyle.Italic)
+                FormatDataType.UNDERLINE -> SpanStyle(textDecoration = TextDecoration.Underline)
+                FormatDataType.URL -> null
+            }
+
+            spanStyle?.let {
+                annotations += AnnotatedString.Range(
+                    item = spanStyle,
+                    start = item.offset,
+                    end = item.offset + item.length
+                )
+            }
+        }
+
+        val newText = AnnotatedString(
+            text = screenState.value.message.text,
+            annotations = annotations
+        )
+
+        screenState.setValue { old ->
+            old.copy(message = old.message.copy(annotatedString = newText))
+        }
+    }
+
+    private fun refreshMessagesFromDb() {
+        viewModelScope.launchDbRefresh(
+            load = {
+                val localMessages = messagesUseCase.getLocalMessages(screenState.value.convoId)
+                messages.setValue { localMessages }
+            },
+            after = ::syncUiMessages
+        )
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryMessageTransportActions.kt

@@ -0,0 +1,232 @@
+package dev.meloda.fast.messageshistory
+
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import android.graphics.Bitmap
+import android.os.Build
+import android.widget.Toast
+import androidx.core.content.FileProvider
+import androidx.core.graphics.drawable.toBitmapOrNull
+import coil.imageLoader
+import coil.request.ImageRequest
+import dev.meloda.fast.common.extensions.launchDbRefresh
+import dev.meloda.fast.common.extensions.listenValue
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.data.State
+import dev.meloda.fast.data.VkUtils
+import dev.meloda.fast.data.processState
+import dev.meloda.fast.domain.ConvoUseCase
+import dev.meloda.fast.domain.MessagesUseCase
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.BaseError
+import dev.meloda.fast.model.api.domain.VkMessage
+import dev.meloda.fast.model.api.domain.VkPhotoDomain
+import dev.meloda.fast.ui.R
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.io.FileOutputStream
+
+internal class MessagesHistoryMessageTransportActions(
+    private val applicationContext: Context,
+    private val viewModelScope: CoroutineScope,
+    private val convoUseCase: ConvoUseCase,
+    private val messagesUseCase: MessagesUseCase,
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val baseError: MutableStateFlow<BaseError?>,
+    private val syncUiMessages: () -> Unit,
+    private val onPinnedMessageChanged: (VkMessage?) -> Unit
+) {
+    fun markAsImportant(messageIds: List<Long>, important: Boolean) {
+        messagesUseCase.markAsImportant(
+            peerId = screenState.value.convoId,
+            messageIds = messageIds,
+            important = important
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = {
+                    viewModelScope.launch {
+                        messageIds.forEach { messageId ->
+                            messagesUseCase.getLocalMessageById(messageId)?.let { localMessage ->
+                                messagesUseCase.storeMessage(localMessage.copy(isImportant = important))
+                            }
+                        }
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun deleteMessage(
+        messageIds: List<Long>,
+        spam: Boolean = false,
+        deleteForAll: Boolean = false,
+        onSuccess: () -> Unit = {}
+    ) {
+        messagesUseCase.delete(
+            peerId = screenState.value.convoId,
+            messageIds = messageIds,
+            spam = spam,
+            deleteForAll = deleteForAll
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = {
+                    viewModelScope.launch {
+                        onSuccess()
+                        val localMessageIds = mutableListOf<Long>()
+                        messageIds.forEach { messageId ->
+                            messagesUseCase.getLocalMessageById(messageId)?.let { localMessage ->
+                                localMessageIds += localMessage.id
+                            }
+                        }
+                        messagesUseCase.deleteLocalMessages(localMessageIds)
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun pinMessage(messageId: Long) {
+        messagesUseCase.pin(
+            peerId = screenState.value.convoId,
+            messageId = messageId,
+            cmId = null
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = { pinnedMessage ->
+                    viewModelScope.launch {
+                        onPinnedMessageChanged(pinnedMessage)
+                        messagesUseCase.storeMessage(pinnedMessage)
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun unpinMessage(messageId: Long) {
+        messagesUseCase.unpin(screenState.value.convoId)
+            .listenValue(viewModelScope) { state ->
+                state.processState(
+                error = ::handleError,
+                success = {
+                    viewModelScope.launch {
+                        messagesUseCase.getLocalMessageById(messageId)?.let { localMessage ->
+                            messagesUseCase.storeMessage(localMessage.copy(isPinned = false))
+                        }
+                        onPinnedMessageChanged(null)
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun readMessage(message: VkMessage) {
+        messagesUseCase.markAsRead(
+            peerId = screenState.value.convoId,
+            startMessageId = message.id
+        ).listenValue(viewModelScope) { state ->
+            state.processState(
+                error = ::handleError,
+                success = {
+                    viewModelScope.launch {
+                        convoUseCase.getLocalConvoById(screenState.value.convoId)?.let { localConvo ->
+                            convoUseCase.storeConvos(
+                                listOf(
+                                    localConvo.copy(
+                                        inRead = if (!message.isOut) message.id else localConvo.inRead,
+                                        outRead = if (message.isOut) message.id else localConvo.outRead
+                                    )
+                                )
+                            )
+                        }
+                        refreshMessagesFromDb()
+                    }
+                }
+            )
+        }
+    }
+
+    fun copyMessage(message: VkMessage) {
+        val clipboardManager =
+            applicationContext.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+
+        val messageToCopy = message.text.orEmpty().trim()
+        if (messageToCopy.isEmpty()) {
+            val photo = with(message.attachments.orEmpty()) {
+                if (size == 1 && all { it is VkPhotoDomain }) {
+                    first() as? VkPhotoDomain
+                } else null
+            } ?: return
+
+            val photoMaxSize = photo.getMaxSize() ?: return
+
+            viewModelScope.launch(Dispatchers.IO) {
+                val drawable = applicationContext.imageLoader.execute(
+                    ImageRequest.Builder(applicationContext)
+                        .data(photoMaxSize.url)
+                        .build()
+                ).drawable ?: return@launch
+
+                val imagesDir = File(applicationContext.cacheDir, "images")
+                if (!imagesDir.exists()) imagesDir.mkdirs()
+                val imageFile = File(imagesDir, "shared_image_id${photo.id}.png")
+                FileOutputStream(imageFile).use {
+                    drawable.toBitmapOrNull()?.compress(Bitmap.CompressFormat.PNG, 100, it)
+                }
+
+                val uri = FileProvider.getUriForFile(
+                    applicationContext,
+                    "${applicationContext.packageName}.provider",
+                    imageFile
+                )
+
+                val clip = ClipData.newUri(applicationContext.contentResolver, "Image", uri)
+                clipboardManager.setPrimaryClip(clip)
+
+                withContext(Dispatchers.Main) {
+                    Toast.makeText(
+                        applicationContext,
+                        "Image copied to clipboard",
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+            return
+        }
+
+        clipboardManager.setPrimaryClip(ClipData.newPlainText("Message", messageToCopy))
+
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.S) {
+            Toast.makeText(applicationContext, R.string.copied_to_clipboard, Toast.LENGTH_SHORT)
+                .show()
+        }
+    }
+
+    private fun handleError(error: State.Error) {
+        VkUtils.parseError(error)?.let { newBaseError ->
+            baseError.setValue { newBaseError }
+        }
+    }
+
+    private fun refreshMessagesFromDb() {
+        viewModelScope.launchDbRefresh(
+            load = {
+                val localMessages = messagesUseCase.getLocalMessages(screenState.value.convoId)
+                messages.setValue { localMessages }
+            },
+            after = ::syncUiMessages
+        )
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryNavigationActions.kt

@@ -0,0 +1,24 @@
+package dev.meloda.fast.messageshistory
+
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.messageshistory.model.MessageNavigation
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.flow.MutableStateFlow
+
+internal class MessagesHistoryNavigationActions(
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>,
+    private val messages: MutableStateFlow<List<VkMessage>>,
+    private val navigation: MutableStateFlow<MessageNavigation?>
+) {
+    fun onTopBarClicked() {
+        val cmId = messages.value.firstOrNull()?.cmId ?: return
+
+        navigation.setValue {
+            MessageNavigation.ChatMaterials(
+                peerId = screenState.value.convoId,
+                cmId = cmId
+            )
+        }
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryPinnedMessageHandler.kt

@@ -0,0 +1,51 @@
+package dev.meloda.fast.messageshistory
+
+import androidx.compose.ui.text.buildAnnotatedString
+import dev.meloda.fast.common.extensions.orDots
+import dev.meloda.fast.common.extensions.setValue
+import dev.meloda.fast.data.VkMemoryCache
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.api.domain.VkMessage
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlin.math.abs
+
+internal class MessagesHistoryPinnedMessageHandler(
+    private val screenState: MutableStateFlow<MessagesHistoryScreenState>
+) {
+    fun update(pinnedMessage: VkMessage?) {
+        if (pinnedMessage == null) {
+            screenState.setValue { old ->
+                old.copy(
+                    pinnedMessage = null,
+                    convo = old.convo.copy(
+                        pinnedMessage = null,
+                        pinnedMessageId = null
+                    ),
+                    pinnedSummary = null,
+                    pinnedTitle = null
+                )
+            }
+            return
+        }
+
+        val pinnedUser = VkMemoryCache.getUser(pinnedMessage.fromId)
+        val pinnedGroup = VkMemoryCache.getGroup(abs(pinnedMessage.fromId))
+        val pinnedTitle = pinnedUser?.fullName ?: pinnedGroup?.name
+
+        val pinnedSummary = buildAnnotatedString {
+            pinnedMessage.text?.let(::append) ?: append("...")
+        }
+
+        screenState.setValue { old ->
+            old.copy(
+                pinnedMessage = pinnedMessage,
+                convo = old.convo.copy(
+                    pinnedMessage = pinnedMessage,
+                    pinnedMessageId = pinnedMessage.id
+                ),
+                pinnedSummary = pinnedSummary,
+                pinnedTitle = pinnedTitle.orDots()
+            )
+        }
+    }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryReadPeersLoader.kt

@@ -0,0 +1,28 @@
+package dev.meloda.fast.messageshistory
+
+import dev.meloda.fast.common.extensions.listenValue
+import dev.meloda.fast.data.processState
+import dev.meloda.fast.domain.GetMessageReadPeersUseCase
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlin.coroutines.resume
+
+internal class MessagesHistoryReadPeersLoader(
+    private val scope: CoroutineScope,
+    private val getMessageReadPeersUseCase: GetMessageReadPeersUseCase
+) {
+    suspend fun loadMessageReadPeers(peerId: Long, cmId: Long): Int =
+        suspendCancellableCoroutine { continuation ->
+            scope.launch {
+                getMessageReadPeersUseCase
+                    .invoke(peerId = peerId, cmId = cmId)
+                    .listenValue(scope) { state ->
+                        state.processState(
+                            error = { continuation.resume(-1) },
+                            success = { count -> continuation.resume(count) }
+                        )
+                    }
+            }
+        }
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/MessagesHistoryUiMapper.kt

@@ -0,0 +1,27 @@
+package dev.meloda.fast.messageshistory
+
+import com.conena.nanokt.collections.indexOfFirstOrNull
+import dev.meloda.fast.common.provider.ResourceProvider
+import dev.meloda.fast.datastore.AppSettings
+import dev.meloda.fast.domain.util.asPresentation
+import dev.meloda.fast.messageshistory.model.MessagesHistoryScreenState
+import dev.meloda.fast.model.api.domain.VkMessage
+import dev.meloda.fast.ui.model.vk.MessageUiItem
+
+fun buildMessagesHistoryUiMessages(
+    messages: List<VkMessage>,
+    selectedMessages: List<VkMessage>,
+    screenState: MessagesHistoryScreenState,
+    resourceProvider: ResourceProvider,
+): List<MessageUiItem> = messages.mapIndexed { index, message ->
+    message.asPresentation(
+        resourceProvider = resourceProvider,
+        showName = true,
+        prevMessage = messages.getOrNull(index + 1),
+        nextMessage = messages.getOrNull(index - 1),
+        showTimeInActionMessages = AppSettings.Experimental.showTimeInActionMessages,
+        convo = screenState.convo,
+        isSelected = screenState.editCmId == message.cmId ||
+            selectedMessages.indexOfFirstOrNull { it.id == message.id } != null
+    )
+}

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/MessagesList.kt

@@ -182,7 +182,7 @@ fun MessagesList(
                         item = item,
                         onClick = {
                             if (item.actionCmId != null) {
-                                onRequestScrollToCmId(item.actionCmId!!)
+                                onRequestScrollToCmId(item.actionCmId)
                             }
                         }
                     )
@@ -301,7 +301,7 @@ fun MessagesList(
                                 },
                                 onReplyClick = {
                                     if (item.replyCmId != null) {
-                                        onRequestScrollToCmId(item.replyCmId!!)
+                                        onRequestScrollToCmId(item.replyCmId)
                                     }
                                 },
                                 offsetX = offsetAnimatable.value
@@ -328,7 +328,7 @@ fun MessagesList(
                                 },
                                 onReplyClick = {
                                     if (item.replyCmId != null) {
-                                        onRequestScrollToCmId(item.replyCmId!!)
+                                        onRequestScrollToCmId(item.replyCmId)
                                     }
                                 },
                                 offsetX = offsetAnimatable.value

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/attachments/Attachments.kt

@@ -214,10 +214,10 @@ fun Attachments(
     }
 }
 
-fun VkAttachment.asUiPhoto(): UiPreview {
+fun VkAttachment.asUiPhoto(): UiPreview? {
     return when (this) {
         is VkPhotoDomain -> {
-            val size = this.getDefault()!!
+            val size = this.getDefault() ?: return null
             UiPreview(
                 id = this.id,
                 url = size.url,
@@ -247,7 +247,7 @@ fun VkAttachment.asUiPhoto(): UiPreview {
         is VkFileDomain -> {
             when {
                 this.preview?.video != null -> {
-                    val video = this.preview?.video!!
+                    val video = this.preview?.video ?: return null
 
                     UiPreview(
                         id = id,
@@ -259,7 +259,7 @@ fun VkAttachment.asUiPhoto(): UiPreview {
                 }
 
                 this.preview?.photo != null -> {
-                    val photoSize = this.preview?.photo?.sizes?.first()!!
+                    val photoSize = this.preview?.photo?.sizes?.firstOrNull() ?: return null
 
                     UiPreview(
                         id = id,
@@ -270,11 +270,11 @@ fun VkAttachment.asUiPhoto(): UiPreview {
                     )
                 }
 
-                else -> error("Unsupported type: $this")
+                else -> null
             }
         }
 
-        else -> error("Unsupported type: $this")
+        else -> null
     }
 }
 

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/presentation/attachments/Link.kt

@@ -108,8 +108,9 @@ fun Link(
 
         Column(modifier = Modifier.weight(1f)) {
             if (item.title != null) {
+                val title = item.title
                 Text(
-                    text = item.title!!,
+                    text = title,
                     style = MaterialTheme.typography.bodyLarge,
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis

feature/profile/src/main/kotlin/dev/meloda/fast/profile/ProfileViewModel.kt

@@ -7,11 +7,11 @@ import dev.meloda.fast.common.extensions.listenValue
 import dev.meloda.fast.common.extensions.setValue
 import dev.meloda.fast.data.State
 import dev.meloda.fast.data.UserConfig
+import dev.meloda.fast.data.VkUtils
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.domain.GetLocalUserByIdUseCase
 import dev.meloda.fast.domain.LoadUserByIdUseCase
 import dev.meloda.fast.model.BaseError
-import dev.meloda.fast.network.VkErrorCode
 import dev.meloda.fast.profile.model.ProfileScreenState
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
@@ -38,14 +38,8 @@ class ProfileViewModelImpl(
             .listenValue(viewModelScope) { state ->
                 state.processState(
                     error = { error ->
-                        if (error is State.Error.ApiError) {
+                        VkUtils.parseError(error)?.let { newBaseError ->
-                            when (error.errorCode) {
+                            baseError.setValue { newBaseError }
-                                VkErrorCode.USER_AUTHORIZATION_FAILED -> {
-                                    baseError.setValue { BaseError.SessionExpired }
-                                }
-
-                                else -> Unit
-                            }
                         }
 
                         screenState.setValue { old ->
@@ -76,7 +70,20 @@ class ProfileViewModelImpl(
         ).listenValue(viewModelScope) { state ->
             state.processState(
                     error = { error ->
-                    // TODO: 12/07/2024, Danil Nikolaev: if local info is null then show error view
+                        VkUtils.parseError(error)?.let { newBaseError ->
+                            baseError.setValue { newBaseError }
+                        }
+
+                        if (baseError.value == null) {
+                            baseError.setValue { BaseError.InternalError }
+                        }
+
+                        screenState.setValue { old ->
+                            old.copy(
+                                avatarUrl = null,
+                                fullName = null
+                            )
+                        }
                     },
                 success = { response ->
                     val user = requireNotNull(response)

feature/settings/src/main/kotlin/dev/meloda/fast/settings/SettingsViewModel.kt

@@ -17,6 +17,7 @@ import dev.meloda.fast.common.model.LongPollState
 import dev.meloda.fast.common.model.UiText
 import dev.meloda.fast.common.model.parseString
 import dev.meloda.fast.data.UserConfig
+import dev.meloda.fast.data.VkMemoryCache
 import dev.meloda.fast.data.db.AccountsRepository
 import dev.meloda.fast.data.processState
 import dev.meloda.fast.datastore.AppSettings
@@ -45,7 +46,8 @@ class SettingsViewModel(
     private val getCurrentAccountUseCase: GetCurrentAccountUseCase,
     private val userSettings: UserSettings,
     private val resources: Resources,
-    private val longPollController: LongPollController
+    private val longPollController: LongPollController,
+    private val vkMemoryCache: VkMemoryCache
 ) : ViewModel() {
 
     private val _screenState = MutableStateFlow(SettingsScreenState.EMPTY)
@@ -112,6 +114,7 @@ class SettingsViewModel(
                                 )
 
                                 accountsRepository.storeAccounts(listOf(account))
+                                vkMemoryCache.clear()
 
                                 _isNeedToRestart.setValue { true }
                             }
@@ -164,6 +167,7 @@ class SettingsViewModel(
             )
 
             tasks.awaitAll()
+            vkMemoryCache.clear()
         }
     }