feat(messages): Implement reply functionality

This commit introduces the ability to reply to messages.

- **API & Data Layer:**
  - Replaced `replyTo` parameter with `forward` in `sendMessage` calls across the data, domain, and repository layers to support the new reply mechanism.

- **ViewModel:**
  - Added logic to handle the reply state, including storing the replied message's ID (`replyToCmId`).
  - When a message is sent, it now correctly constructs a `forward` JSON object if it is a reply.
  - The UI state (`MessagesHistoryScreenState`) is updated to show and hide the reply preview.
  - Added a `onReplyCloseClicked` handler to cancel a reply.
  - The ViewModel interface was removed, and the implementation class `MessagesHistoryViewModelImpl` is used directly.

- **UI (Compose):**
  - A new `ReplyContainer` is displayed above the message input bar when a reply is active.
  - The input bar's corner radius animates to integrate with the reply container.
  - Added a `FocusRequester` to automatically focus the input field when the reply action is selected.
  - Added spacing in the message list to prevent the reply preview from overlapping messages.
  - The message options dialog now passes the `messageId` and `cmId` when an option is picked.

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

@@ -32,7 +32,7 @@ interface MessagesRepository {
         peerId: Long,
         randomId: Long,
         message: String?,
-        replyTo: Long?,
+        forward: String?,
         attachments: List<VkAttachment>?,
         formatData: VkMessage.FormatData?
     ): ApiResult<MessagesSendResponse, RestApiErrorDomain>

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

@@ -195,7 +195,7 @@ class MessagesRepositoryImpl(
         peerId: Long,
         randomId: Long,
         message: String?,
-        replyTo: Long?,
+        forward: String?,
         attachments: List<VkAttachment>?,
         formatData: VkMessage.FormatData?
     ): ApiResult<MessagesSendResponse, RestApiErrorDomain> = withContext(Dispatchers.IO) {
@@ -203,7 +203,7 @@ class MessagesRepositoryImpl(
             peerId = peerId,
             randomId = randomId,
             message = message,
-            replyTo = replyTo,
+            forward = forward,
             attachments = attachments,
             formatData = formatData
         )

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

@@ -32,7 +32,7 @@ interface MessagesUseCase : BaseUseCase {
         peerId: Long,
         randomId: Long,
         message: String?,
-        replyTo: Long?,
+        forward: String?,
         attachments: List<VkAttachment>?,
         formatData: VkMessage.FormatData?
     ): Flow<State<MessagesSendResponse>>

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

@@ -56,7 +56,7 @@ class MessagesUseCaseImpl(
         peerId: Long,
         randomId: Long,
         message: String?,
-        replyTo: Long?,
+        forward: String?,
         attachments: List<VkAttachment>?,
         formatData: VkMessage.FormatData?
     ): Flow<State<MessagesSendResponse>> = flowNewState {
@@ -64,7 +64,7 @@ class MessagesUseCaseImpl(
             peerId = peerId,
             randomId = randomId,
             message = message,
-            replyTo = replyTo,
+            forward = forward,
             attachments = attachments,
             formatData = formatData
         ).mapToState()

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

@@ -34,7 +34,7 @@ data class MessagesSendRequest(
     val message: String?,
     val lat: Int? = null,
     val lon: Int? = null,
-    val replyTo: Long? = null,
+    val forward: String? = null,
     val stickerId: Long? = null,
     val disableMentions: Boolean? = null,
     val doNotParseLinks: Boolean? = null,
@@ -51,7 +51,7 @@ data class MessagesSendRequest(
             message?.let { this["message"] = it }
             lat?.let { this["lat"] = it.toString() }
             lon?.let { this["lon"] = it.toString() }
-            replyTo?.let { this["reply_to"] = it.toString() }
+            forward?.let { this["forward"] = it }
             stickerId?.let { this["sticker_id"] = it.toString() }
             disableMentions?.let { this["disable_mentions"] = it.asInt().toString() }
             doNotParseLinks?.let { this["dont_parse_links"] = it.asInt().toString() }

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

@@ -65,62 +65,15 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import kotlinx.serialization.json.add
+import kotlinx.serialization.json.buildJsonArray
+import kotlinx.serialization.json.buildJsonObject
+import kotlinx.serialization.json.put
 import java.io.File
 import java.io.FileOutputStream
 import kotlin.math.abs
 import kotlin.random.Random
 
-interface MessagesHistoryViewModel {
-
-    val screenState: StateFlow<MessagesHistoryScreenState>
-    val navigation: StateFlow<MessageNavigation?>
-    val messages: StateFlow<List<VkMessage>>
-    val uiMessages: StateFlow<List<UiItem>>
-    val dialog: StateFlow<MessageDialog?>
-    val selectedMessages: StateFlow<List<VkMessage>>
-
-    val isNeedToScrollToIndex: StateFlow<Int?>
-
-    val baseError: StateFlow<BaseError?>
-    val imagesToPreload: StateFlow<List<String>>
-
-    val currentOffset: StateFlow<Int>
-    val canPaginate: StateFlow<Boolean>
-
-    fun onNavigationConsumed()
-
-    fun onTopBarClicked()
-
-    fun onDialogConfirmed(dialog: MessageDialog, bundle: Bundle)
-    fun onDialogDismissed(dialog: MessageDialog)
-    fun onDialogItemPicked(dialog: MessageDialog, bundle: Bundle)
-
-    fun onScrolledToIndex()
-
-    fun onCloseButtonClicked()
-    fun onRefresh()
-    fun onAttachmentButtonClicked()
-    fun onMessageInputChanged(newText: TextFieldValue)
-    fun onEmojiButtonLongClicked()
-    fun onActionButtonClicked()
-
-    fun onPaginationConditionsMet()
-
-    fun onMessageClicked(messageId: Long)
-    fun onMessageLongClicked(messageId: Long)
-
-    fun onPinnedMessageClicked(messageId: Long)
-    fun onUnpinMessageClicked()
-
-    fun onDeleteSelectedMessagesClicked()
-
-    fun onBoldClicked()
-    fun onItalicClicked()
-    fun onUnderlineClicked()
-    fun onLinkClicked()
-    fun onRegularClicked()
-}
-
 class MessagesHistoryViewModelImpl(
     private val applicationContext: Context,
     private val messagesUseCase: MessagesUseCase,
@@ -137,6 +90,8 @@ class MessagesHistoryViewModelImpl(
     override val dialog = MutableStateFlow<MessageDialog?>(null)
     override val selectedMessages = MutableStateFlow<List<VkMessage>>(emptyList())
 
+    override val inputFieldFocusRequester = MutableStateFlow(false)
+
     override val isNeedToScrollToIndex = MutableStateFlow<Int?>(null)
 
     override val baseError = MutableStateFlow<BaseError?>(null)
@@ -154,6 +109,8 @@ class MessagesHistoryViewModelImpl(
     private val sendingMessages: MutableList<VkMessage> = mutableListOf()
     private val failedMessages: MutableList<VkMessage> = mutableListOf()
 
+    private var replyToCmId: Long? = null
+
     init {
         val arguments = MessagesHistory.from(savedStateHandle).arguments
 
@@ -268,6 +225,9 @@ class MessagesHistoryViewModelImpl(
     override fun onDialogItemPicked(dialog: MessageDialog, bundle: Bundle) {
         when (dialog) {
             is MessageDialog.MessageOptions -> {
+                val messageId = bundle.getLong("messageId")
+                val cmId = bundle.getLong("cmId")
+
                 when (val option = bundle.getParcelableCompat("option", MessageOption::class)) {
                     null -> Unit
 
@@ -275,9 +235,30 @@ class MessagesHistoryViewModelImpl(
                         // TODO: 28-Mar-25, Danil Nikolaev: retry sending
                     }
 
-                    MessageOption.Reply -> {}
+                    MessageOption.Reply -> {
-                    MessageOption.ForwardHere -> {}
+                        inputFieldFocusRequester.setValue { true }
-                    MessageOption.Forward -> {}
+                        replyToCmId = cmId
+                        screenState.setValue { old ->
+                            val msg = messages.value.find { it.id == messageId }
+
+                            if (msg == null) {
+                                old
+                            } else {
+                                old.copy(
+                                    replyTitle = msg.extractTitle(),
+                                    replyText = msg.text
+                                )
+                            }
+                        }
+                    }
+
+                    MessageOption.ForwardHere -> {
+
+                    }
+
+                    MessageOption.Forward -> {
+
+                    }
 
                     MessageOption.Pin -> {
                         this.dialog.setValue {
@@ -584,6 +565,17 @@ class MessagesHistoryViewModelImpl(
         updateStyles()
     }
 
+    override fun onReplyCloseClicked() {
+        replyToCmId = null
+
+        screenState.setValue { old ->
+            old.copy(
+                replyTitle = null,
+                replyText = null
+            )
+        }
+    }
+
     private fun handleNewMessage(event: LongPollParsedEvent.NewMessage) {
         val message = event.message
 
@@ -927,6 +919,7 @@ class MessagesHistoryViewModelImpl(
             forwards = null,
             attachments = null,
             replyMessage = when {
+                replyToCmId != null -> messages.value.find { it.cmId == replyToCmId }
                 else -> null
             },
             geoType = null,
@@ -947,15 +940,32 @@ class MessagesHistoryViewModelImpl(
         screenState.setValue { old ->
             old.copy(
                 message = TextFieldValue(),
-                actionMode = ActionMode.RECORD_AUDIO
+                actionMode = ActionMode.RECORD_AUDIO,
+                replyTitle = null,
+                replyText = null
             )
         }
 
+        val replyCmId = replyToCmId
+        replyToCmId = null
+
+        val forward = when {
+            replyCmId != null -> {
+                buildJsonObject {
+                    put("peer_id", screenState.value.conversationId)
+                    put("conversation_message_ids", buildJsonArray { add(replyCmId) })
+                    put("is_reply", true)
+                }.toString()
+            }
+
+            else -> null
+        }
+
         messagesUseCase.sendMessage(
             peerId = screenState.value.conversationId,
             randomId = newMessage.randomId,
             message = newMessage.text,
-            replyTo = null,
+            forward = forward,
             attachments = null,
             formatData = newMessage.formatData
         ).listenValue(viewModelScope) { state ->

feature/messageshistory/src/main/kotlin/dev/meloda/fast/messageshistory/model/MessagesHistoryScreenState.kt

@@ -24,7 +24,9 @@ data class MessagesHistoryScreenState(
     val conversation: VkConversation,
     val pinnedMessage: VkMessage?,
     val pinnedTitle: String?,
-    val pinnedSummary: AnnotatedString?
+    val pinnedSummary: AnnotatedString?,
+    val replyTitle: String?,
+    val replyText: String?
 ) {
 
     companion object {
@@ -43,7 +45,9 @@ data class MessagesHistoryScreenState(
             conversation = VkConversation.EMPTY,
             pinnedMessage = null,
             pinnedTitle = null,
-            pinnedSummary = null
+            pinnedSummary = null,
+            replyTitle = null,
+            replyText = null,
         )
     }
 }

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

@@ -180,7 +180,13 @@ fun MessageOptionsDialog(
                     onClick = {
                         onDismissed()
                         val pickedOption = options[index]
-                        onItemPicked(bundleOf("option" to pickedOption))
+                        onItemPicked(
+                            bundleOf(
+                                "option" to pickedOption,
+                                "messageId" to message.id,
+                                "cmId" to message.cmId
+                            )
+                        )
                     }
                 )
             }

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

@@ -1,7 +1,9 @@
 package dev.meloda.fast.messageshistory.presentation
 
 import androidx.compose.animation.AnimatedContent
+import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateContentSize
+import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.scaleIn
@@ -32,10 +34,14 @@ import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.material3.surfaceColorAtElevation
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.onGloballyPositioned
 import androidx.compose.ui.platform.LocalContext
@@ -54,9 +60,9 @@ import dev.chrisbanes.haze.materials.ExperimentalHazeMaterialsApi
 import dev.chrisbanes.haze.materials.HazeMaterials
 import dev.meloda.fast.datastore.AppSettings
 import dev.meloda.fast.messageshistory.model.ActionMode
+import dev.meloda.fast.ui.R
 import dev.meloda.fast.ui.components.IconButton
 import dev.meloda.fast.ui.theme.LocalThemeConfig
-import dev.meloda.fast.ui.R
 
 @OptIn(ExperimentalLayoutApi::class, ExperimentalHazeMaterialsApi::class)
 @Composable
@@ -68,6 +74,9 @@ fun MessagesHistoryInputBar(
     showEmojiButton: Boolean,
     showAttachmentButton: Boolean,
     actionMode: ActionMode,
+    replyTitle: String?,
+    replyText: String?,
+    inputFieldFocusRequester: Boolean,
     onMessageInputChanged: (TextFieldValue) -> Unit = {},
     onBoldRequested: () -> Unit = {},
     onItalicRequested: () -> Unit = {},
@@ -77,16 +86,28 @@ fun MessagesHistoryInputBar(
     onSetMessageBarHeight: (Dp) -> Unit = {},
     onEmojiButtonLongClicked: () -> Unit = {},
     onAttachmentButtonClicked: () -> Unit = {},
-    onActionButtonClicked: () -> Unit = {}
+    onActionButtonClicked: () -> Unit = {},
+    onReplyCloseClicked: () -> Unit = {}
 ) {
     val view = LocalView.current
     val context = LocalContext.current
     val density = LocalDensity.current
 
-    val scope = rememberCoroutineScope()
+    val focusRequester = remember { FocusRequester() }
+
+    LaunchedEffect(inputFieldFocusRequester) {
+        if (inputFieldFocusRequester) {
+            focusRequester.requestFocus()
+        }
+    }
 
     val theme = LocalThemeConfig.current
 
+    val inputBarTopCornerRadius by animateDpAsState(
+        targetValue = if (replyTitle == null) 24.dp else 0.dp,
+        label = "inputBarTopCornerRadius"
+    )
+
     Column(
         modifier = modifier
             .fillMaxWidth()
@@ -95,6 +116,14 @@ fun MessagesHistoryInputBar(
             .navigationBarsPadding()
             .imePadding()
     ) {
+        AnimatedVisibility(replyTitle != null) {
+            ReplyContainer(
+                title = replyTitle.orEmpty(),
+                text = replyText.orEmpty(),
+                onCloseClicked = onReplyCloseClicked,
+            )
+        }
+
         Row(
             modifier = Modifier
                 .fillMaxWidth()
@@ -102,10 +131,17 @@ fun MessagesHistoryInputBar(
                 .imeNestedScroll(),
             verticalAlignment = Alignment.CenterVertically
         ) {
-            Spacer(modifier = Modifier.width(10.dp))
+            Spacer(modifier = Modifier.width(8.dp))
             Row(
                 modifier = Modifier
-                    .clip(RoundedCornerShape(36.dp))
+                    .clip(
+                        RoundedCornerShape(
+                            topStart = inputBarTopCornerRadius,
+                            topEnd = inputBarTopCornerRadius,
+                            bottomStart = 24.dp,
+                            bottomEnd = 24.dp
+                        )
+                    )
                     .then(
                         if (theme.enableBlur) {
                             Modifier
@@ -166,6 +202,7 @@ fun MessagesHistoryInputBar(
 
                 TextField(
                     modifier = Modifier
+                        .focusRequester(focusRequester)
                         .weight(1f)
                         .appendTextContextMenuComponents {
                             separator()
@@ -287,7 +324,7 @@ fun MessagesHistoryInputBar(
                 Spacer(modifier = Modifier.width(6.dp))
             }
 
-            Spacer(modifier = Modifier.width(10.dp))
+            Spacer(modifier = Modifier.width(8.dp))
         }
     }
 }

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

@@ -4,7 +4,6 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
-import dev.meloda.fast.common.model.UiImage
 import dev.meloda.fast.datastore.AppSettings
 import dev.meloda.fast.messageshistory.MessagesHistoryViewModel
 import dev.meloda.fast.messageshistory.MessagesHistoryViewModelImpl
@@ -30,6 +29,7 @@ fun MessagesHistoryRoute(
     val baseError by viewModel.baseError.collectAsStateWithLifecycle()
     val canPaginate by viewModel.canPaginate.collectAsStateWithLifecycle()
     val scrollIndex by viewModel.isNeedToScrollToIndex.collectAsStateWithLifecycle()
+    val inputFieldFocusRequester by viewModel.inputFieldFocusRequester.collectAsStateWithLifecycle()
 
     LaunchedEffect(navigationEvent) {
         val needToConsume = when (val navigation = navigationEvent) {
@@ -56,6 +56,7 @@ fun MessagesHistoryRoute(
         showEmojiButton = AppSettings.General.showEmojiButton,
         showAttachmentButton = AppSettings.General.showAttachmentButton,
         enableHaptic = AppSettings.General.enableHaptic,
+        inputFieldFocusRequester = inputFieldFocusRequester,
         onBack = onBack,
         onClose = viewModel::onCloseButtonClicked,
         onScrolledToIndex = viewModel::onScrolledToIndex,
@@ -77,7 +78,8 @@ fun MessagesHistoryRoute(
         onItalicRequested = viewModel::onItalicClicked,
         onUnderlineRequested = viewModel::onUnderlineClicked,
         onLinkRequested = viewModel::onLinkClicked,
-        onRegularRequested = viewModel::onRegularClicked
+        onRegularRequested = viewModel::onRegularClicked,
+        onReplyCloseClicked = viewModel::onReplyCloseClicked
     )
 
     HandleDialogs(

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

@@ -44,13 +44,13 @@ import dev.meloda.fast.messageshistory.model.UiItem
 import dev.meloda.fast.messageshistory.util.indexOfMessageByCmId
 import dev.meloda.fast.model.BaseError
 import dev.meloda.fast.model.api.domain.VkMessage
+import dev.meloda.fast.ui.R
 import dev.meloda.fast.ui.components.Loader
 import dev.meloda.fast.ui.components.VkErrorView
 import dev.meloda.fast.ui.theme.LocalThemeConfig
 import dev.meloda.fast.ui.util.ImmutableList
 import dev.meloda.fast.ui.util.emptyImmutableList
 import kotlinx.coroutines.launch
-import dev.meloda.fast.ui.R
 
 @OptIn(
     ExperimentalMaterial3Api::class,
@@ -70,6 +70,7 @@ fun MessagesHistoryScreen(
     showEmojiButton: Boolean = false,
     showAttachmentButton: Boolean = false,
     enableHaptic: Boolean = false,
+    inputFieldFocusRequester: Boolean,
     onBack: () -> Unit = {},
     onClose: () -> Unit = {},
     onScrolledToIndex: () -> Unit = {},
@@ -91,7 +92,8 @@ fun MessagesHistoryScreen(
     onItalicRequested: () -> Unit = {},
     onLinkRequested: () -> Unit = {},
     onUnderlineRequested: () -> Unit = {},
-    onRegularRequested: () -> Unit = {}
+    onRegularRequested: () -> Unit = {},
+    onReplyCloseClicked: () -> Unit = {},
 ) {
     val context = LocalContext.current
     val view = LocalView.current
@@ -215,6 +217,7 @@ fun MessagesHistoryScreen(
                 uiMessages = uiMessages,
                 isSelectedAtLeastOne = isSelectedAtLeastOne,
                 isPaginating = screenState.isPaginating,
+                isReplying = screenState.replyTitle != null,
                 messageBarHeight = messageBarHeight,
                 onRequestScrollToCmId = { cmId ->
                     val index = uiMessages.values.indexOfMessageByCmId(cmId)
@@ -252,10 +255,14 @@ fun MessagesHistoryScreen(
                 showEmojiButton = showEmojiButton,
                 showAttachmentButton = showAttachmentButton,
                 actionMode = screenState.actionMode,
+                replyTitle = screenState.replyTitle,
+                replyText = screenState.replyText,
+                inputFieldFocusRequester = inputFieldFocusRequester,
                 onSetMessageBarHeight = { messageBarHeight = it },
                 onEmojiButtonLongClicked = onEmojiButtonLongClicked,
                 onAttachmentButtonClicked = onAttachmentButtonClicked,
-                onActionButtonClicked = onActionButtonClicked
+                onActionButtonClicked = onActionButtonClicked,
+                onReplyCloseClicked = onReplyCloseClicked
             )
 
             when {

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

@@ -53,6 +53,7 @@ fun MessagesList(
     uiMessages: ImmutableList<UiItem>,
     isSelectedAtLeastOne: Boolean,
     isPaginating: Boolean,
+    isReplying: Boolean,
     messageBarHeight: Dp,
     onRequestScrollToCmId: (cmId: Long) -> Unit = {},
     onMessageClicked: (Long) -> Unit = {},
@@ -132,6 +133,10 @@ fun MessagesList(
         reverseLayout = true
     ) {
         item {
+            AnimatedVisibility(isReplying) {
+                Spacer(modifier = Modifier.height(48.dp))
+            }
+
             Spacer(modifier = Modifier.height(messageBarHeight.plus(18.dp)))
             Spacer(
                 modifier = Modifier