Chat creation feature (#138)

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

@@ -20,4 +20,8 @@ class GetLocalUserByIdUseCase(private val repository: UsersRepository) {
 
         emit(newState)
     }
+
+    suspend fun proceed(userId: Int): VkUser? {
+        return repository.getLocalUsers(userIds = listOf(userId)).singleOrNull()
+    }
 }

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

@@ -42,6 +42,11 @@ interface MessagesUseCase {
         conversationMessageId: Int
     ): Flow<State<List<VkAttachmentHistoryMessage>>>
 
+    fun createChat(
+        userIds: List<Int>?,
+        title: String?
+    ): Flow<State<Int>>
+
     suspend fun storeMessage(message: VkMessage)
     suspend fun storeMessages(messages: List<VkMessage>)
 }

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

@@ -100,6 +100,14 @@ class MessagesUseCaseImpl(
         emit(newState)
     }
 
+    override fun createChat(userIds: List<Int>?, title: String?): Flow<State<Int>> = flow {
+        emit(State.Loading)
+
+        val newState = repository.createChat(userIds, title).mapToState()
+
+        emit(newState)
+    }
+
     override suspend fun storeMessage(message: VkMessage) {
         repository.storeMessages(listOf(message))
     }

core/domain/src/main/kotlin/dev/meloda/fast/domain/util/FriendMapper.kt

@@ -0,0 +1,22 @@
+package dev.meloda.fast.domain.util
+
+import dev.meloda.fast.common.model.UiImage
+import dev.meloda.fast.data.VkMemoryCache
+import dev.meloda.fast.model.api.domain.VkUser
+import dev.meloda.fast.ui.model.api.UiFriend
+
+fun VkUser.asPresentation(
+    useContactNames: Boolean = false
+): UiFriend = UiFriend(
+    userId = id,
+    avatar = photo100?.let(UiImage::Url),
+    title = if (useContactNames) {
+        VkMemoryCache.getContact(id)?.name ?: fullName
+    } else {
+        fullName
+    },
+    onlineStatus = onlineStatus,
+    photo400Orig = photo400Orig?.let(UiImage::Url),
+    firstName = firstName,
+    lastName = lastName
+)