feat: harden chat list sync and polish media viewer

- prevent stale refreshChat snapshots from overwriting newer realtime chat list state

- add reaction overlay and double-tap zoom in the media viewer

android/app/src/main/java/ru/daemonlord/messenger/data/chat/local/dao/ChatDao.kt

@@ -89,6 +89,9 @@ interface ChatDao {
     @Query("SELECT muted FROM chats WHERE id = :chatId LIMIT 1")
     suspend fun isChatMuted(chatId: Long): Boolean?
 
+    @Query("SELECT * FROM chats WHERE id = :chatId LIMIT 1")
+    suspend fun getChatEntity(chatId: Long): ChatEntity?
+
     @Query("UPDATE chats SET muted = :muted WHERE id = :chatId")
     suspend fun updateChatMuted(chatId: Long, muted: Boolean)
 

android/app/src/main/java/ru/daemonlord/messenger/data/chat/repository/NetworkChatRepository.kt

@@ -20,6 +20,7 @@ import ru.daemonlord.messenger.data.chat.dto.ChatNotificationSettingsUpdateDto
 import ru.daemonlord.messenger.data.chat.dto.ChatProfileUpdateRequestDto
 import ru.daemonlord.messenger.data.chat.dto.ChatTitleUpdateRequestDto
 import ru.daemonlord.messenger.data.chat.dto.DiscoverChatDto
+import ru.daemonlord.messenger.data.chat.local.entity.ChatEntity
 import ru.daemonlord.messenger.data.chat.local.dao.ChatDao
 import ru.daemonlord.messenger.data.chat.mapper.toChatEntity
 import ru.daemonlord.messenger.data.chat.mapper.toDomain
@@ -82,7 +83,21 @@ class NetworkChatRepository @Inject constructor(
         try {
             val chat = chatApiService.getChatById(chatId = chatId)
             chatDao.upsertUsers(chat.toUserShortEntityOrNull()?.let(::listOf).orEmpty())
-            chatDao.upsertChats(listOf(chat.toChatEntity()))
+            val incomingEntity = chat.toChatEntity()
+            val localEntity = chatDao.getChatEntity(chatId = chatId)
+            val mergedEntity = if (localEntity != null && localEntity.isLocallyNewerThan(incomingEntity)) {
+                incomingEntity.copy(
+                    unreadCount = maxOf(localEntity.unreadCount, incomingEntity.unreadCount),
+                    unreadMentionsCount = maxOf(localEntity.unreadMentionsCount, incomingEntity.unreadMentionsCount),
+                    lastMessageText = localEntity.lastMessageText,
+                    lastMessageType = localEntity.lastMessageType,
+                    lastMessageCreatedAt = localEntity.lastMessageCreatedAt,
+                    updatedSortAt = localEntity.updatedSortAt,
+                )
+            } else {
+                incomingEntity
+            }
+            chatDao.upsertChats(listOf(mergedEntity))
             AppResult.Success(Unit)
         } catch (error: Throwable) {
             AppResult.Error(error.toAppError())
@@ -422,3 +437,11 @@ class NetworkChatRepository @Inject constructor(
         )
     }
 }
+
+private fun ChatEntity.isLocallyNewerThan(other: ChatEntity): Boolean {
+    val localSort = updatedSortAt ?: lastMessageCreatedAt
+    val remoteSort = other.updatedSortAt ?: other.lastMessageCreatedAt
+    if (localSort.isNullOrBlank()) return false
+    if (remoteSort.isNullOrBlank()) return true
+    return localSort > remoteSort
+}

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt

@@ -656,7 +656,12 @@ private fun ChatScreen(
     val view = LocalView.current
     val listState = rememberLazyListState()
     val scope = rememberCoroutineScope()
-    val allViewerMediaItems = remember(state.messages) { buildChatViewerMediaItems(state.messages) }
+    val allViewerMediaItems = remember(state.messages, state.reactionByMessageId) {
+        buildChatViewerMediaItems(
+            messages = state.messages,
+            reactionByMessageId = state.reactionByMessageId,
+        )
+    }
     val isTabletLayout = LocalConfiguration.current.screenWidthDp >= 840
     val isChannelChat = state.chatType.equals("channel", ignoreCase = true)
     val isPrivateChat = state.chatType.equals("private", ignoreCase = true)
@@ -2451,6 +2456,7 @@ private fun PrivateChatInfoCard(
 private data class ChatViewerMediaItem(
     val url: String,
     val type: ChatViewerMediaType,
+    val reactions: List<ru.daemonlord.messenger.domain.message.model.MessageReaction> = emptyList(),
 )
 
 @Composable
@@ -2518,6 +2524,37 @@ private fun ChatMediaViewerOverlay(
                     )
                 }
             }
+
+            AnimatedVisibility(
+                visible = showTopBar && items.getOrNull(pagerState.currentPage)?.reactions?.isNotEmpty() == true,
+                enter = fadeIn(),
+                exit = fadeOut(),
+            ) {
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 16.dp, vertical = 12.dp)
+                        .horizontalScroll(rememberScrollState()),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                ) {
+                    items.getOrNull(pagerState.currentPage)
+                        ?.reactions
+                        ?.forEach { reaction ->
+                            Surface(
+                                shape = RoundedCornerShape(999.dp),
+                                color = Color.White.copy(alpha = 0.14f),
+                            ) {
+                                Text(
+                                    text = "${reaction.emoji} ${reaction.count}",
+                                    modifier = Modifier.padding(horizontal = 10.dp, vertical = 6.dp),
+                                    color = Color.White,
+                                    style = MaterialTheme.typography.labelMedium,
+                                    fontWeight = if (reaction.reacted) FontWeight.SemiBold else FontWeight.Normal,
+                                )
+                            }
+                        }
+                }
+            }
         }
     }
 
@@ -2588,6 +2625,15 @@ private fun ZoomableImageViewerPage(
             .pointerInput(imageUrl) {
                 detectTapGestures(
                     onTap = { onToggleChrome() },
+                    onDoubleTap = {
+                        if (scale > 1.3f) {
+                            scale = 1f
+                            offset = Offset.Zero
+                        } else {
+                            scale = 2.2f
+                            offset = Offset.Zero
+                        }
+                    },
                 )
             },
         contentAlignment = Alignment.Center,
@@ -6512,10 +6558,14 @@ private fun buildChatInfoEntries(
     return entries
 }
 
-private fun buildChatViewerMediaItems(messages: List<MessageItem>): List<ChatViewerMediaItem> {
+private fun buildChatViewerMediaItems(
+    messages: List<MessageItem>,
+    reactionByMessageId: Map<Long, List<ru.daemonlord.messenger.domain.message.model.MessageReaction>> = emptyMap(),
+): List<ChatViewerMediaItem> {
     return messages
         .flatMap { message ->
             val messageType = message.type.lowercase(Locale.getDefault())
+            val reactions = reactionByMessageId[message.id].orEmpty()
             val items = message.attachments.mapNotNull { attachment ->
                 val fileType = attachment.fileType.lowercase(Locale.getDefault())
                 when {
@@ -6524,6 +6574,7 @@ private fun buildChatViewerMediaItems(messages: List<MessageItem>): List<ChatVie
                         !fileType.contains("webp") -> ChatViewerMediaItem(
                         url = attachment.fileUrl,
                         type = ChatViewerMediaType.Image,
+                        reactions = reactions,
                     )
 
                     fileType.startsWith("video/") &&
@@ -6531,6 +6582,7 @@ private fun buildChatViewerMediaItems(messages: List<MessageItem>): List<ChatVie
                         !messageType.contains("video_note") -> ChatViewerMediaItem(
                         url = attachment.fileUrl,
                         type = ChatViewerMediaType.Video,
+                        reactions = reactions,
                     )
 
                     else -> null
@@ -6549,11 +6601,13 @@ private fun buildChatViewerMediaItems(messages: List<MessageItem>): List<ChatVie
                         !isStickerLikeUrl(legacyUrl) -> items += ChatViewerMediaItem(
                         url = legacyUrl,
                         type = ChatViewerMediaType.Image,
+                        reactions = reactions,
                     )
 
                     messageType == "video" -> items += ChatViewerMediaItem(
                         url = legacyUrl,
                         type = ChatViewerMediaType.Video,
+                        reactions = reactions,
                     )
                 }
             }