android: enable multi-select forward execution in chat

android/CHANGELOG.md

@@ -176,3 +176,9 @@
 - Integrated `ChatViewModel` with reducer-backed selection logic while preserving current UI behavior.
 - Added base ViewModel handlers for entering/toggling multi-select mode (`onEnterMultiSelect`, `onToggleMessageMultiSelection`, `onClearSelection`).
 - Added unit tests for reducer transitions and available intents (`MessageActionStateTest`).
+
+### Step 28 - Core base / Android multi-forward execution
+- Switched chat forward state from single-message payload to `forwardingMessageIds` set.
+- Extended `ChatViewModel` forward flow: multi-select now forwards multiple source messages in one action.
+- Wired `ForwardMessageBulkUseCase` for multi-message forwarding (sequential safe execution with error short-circuit).
+- Updated chat action bar and forward sheet labels for multi-selection count.

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

@@ -74,6 +74,9 @@ fun ChatRoute(
         onInputChanged = viewModel::onInputChanged,
         onSendClick = viewModel::onSendClick,
         onSelectMessage = viewModel::onSelectMessage,
+        onEnterMultiSelect = viewModel::onEnterMultiSelect,
+        onToggleMessageMultiSelection = viewModel::onToggleMessageMultiSelection,
+        onClearSelection = viewModel::onClearSelection,
         onReplySelected = viewModel::onReplySelected,
         onEditSelected = viewModel::onEditSelected,
         onDeleteSelected = viewModel::onDeleteSelected,
@@ -94,6 +97,9 @@ fun ChatScreen(
     onInputChanged: (String) -> Unit,
     onSendClick: () -> Unit,
     onSelectMessage: (MessageItem?) -> Unit,
+    onEnterMultiSelect: (MessageItem) -> Unit,
+    onToggleMessageMultiSelection: (MessageItem) -> Unit,
+    onClearSelection: () -> Unit,
     onReplySelected: (MessageItem) -> Unit,
     onEditSelected: (MessageItem) -> Unit,
     onDeleteSelected: (Boolean) -> Unit,
@@ -145,43 +151,66 @@ fun ChatScreen(
                     verticalArrangement = Arrangement.spacedBy(6.dp),
                 ) {
                     items(state.messages, key = { it.id }) { message ->
+                        val isSelected = state.actionState.selectedMessageIds.contains(message.id)
                         MessageBubble(
                             message = message,
-                            isSelected = state.selectedMessage?.id == message.id,
+                            isSelected = isSelected,
                             reactions = state.reactionByMessageId[message.id].orEmpty(),
                             onAttachmentImageClick = { imageUrl -> viewerImageUrl = imageUrl },
-                            onLongPress = { onSelectMessage(message) },
+                            onClick = {
+                                if (state.actionState.mode == MessageSelectionMode.MULTI) {
+                                    onToggleMessageMultiSelection(message)
+                                }
+                            },
+                            onLongPress = {
+                                if (state.actionState.mode == MessageSelectionMode.MULTI) {
+                                    onToggleMessageMultiSelection(message)
+                                } else {
+                                    onEnterMultiSelect(message)
+                                }
+                            },
                         )
                     }
                 }
             }
         }
 
-        if (state.selectedMessage != null) {
+        if (state.actionState.hasSelection) {
             Row(
                 modifier = Modifier
                     .fillMaxWidth()
                     .padding(horizontal = 12.dp, vertical = 6.dp),
                 horizontalArrangement = Arrangement.spacedBy(8.dp),
             ) {
-                Button(onClick = { onReplySelected(state.selectedMessage) }) { Text("Reply") }
-                Button(
-                    onClick = { onEditSelected(state.selectedMessage) },
-                    enabled = state.selectedCanEdit,
-                ) { Text("Edit") }
+                Text(
+                    text = "${state.actionState.selectedCount} selected",
+                    style = MaterialTheme.typography.labelLarge,
+                    modifier = Modifier.padding(top = 12.dp),
+                )
+                if (state.actionState.mode == MessageSelectionMode.SINGLE && state.selectedMessage != null) {
+                    Button(onClick = { onReplySelected(state.selectedMessage) }) { Text("Reply") }
+                    Button(
+                        onClick = { onEditSelected(state.selectedMessage) },
+                        enabled = state.selectedCanEdit,
+                    ) { Text("Edit") }
+                }
                 Button(onClick = { onDeleteSelected(false) }) { Text("Delete") }
                 Button(
                     onClick = { onDeleteSelected(true) },
-                    enabled = state.selectedCanDeleteForAll,
+                    enabled = state.actionState.mode == MessageSelectionMode.SINGLE && state.selectedCanDeleteForAll,
                 ) { Text("Del for all") }
-                Button(onClick = onForwardSelected) { Text("Forward") }
-                Button(onClick = { onToggleReaction("\uD83D\uDC4D") }) { Text("\uD83D\uDC4D") }
-                Button(onClick = { onToggleReaction("\uD83D\uDE02") }) { Text("\uD83D\uDE02") }
-                Button(onClick = { onSelectMessage(null) }) { Text("Close") }
+                Button(onClick = onForwardSelected) {
+                    Text(if (state.actionState.mode == MessageSelectionMode.MULTI) "Forward selected" else "Forward")
+                }
+                if (state.actionState.mode == MessageSelectionMode.SINGLE) {
+                    Button(onClick = { onToggleReaction("\uD83D\uDC4D") }) { Text("\uD83D\uDC4D") }
+                    Button(onClick = { onToggleReaction("\uD83D\uDE02") }) { Text("\uD83D\uDE02") }
+                }
+                Button(onClick = onClearSelection) { Text("Close") }
             }
         }
 
-        if (state.forwardingMessage != null) {
+        if (state.forwardingMessageIds.isNotEmpty()) {
             Column(
                 modifier = Modifier
                     .fillMaxWidth()
@@ -190,7 +219,11 @@ fun ChatScreen(
                 verticalArrangement = Arrangement.spacedBy(6.dp),
             ) {
                 Text(
-                    text = "Forward message #${state.forwardingMessage.id}",
+                    text = if (state.forwardingMessageIds.size == 1) {
+                        "Forward message #${state.forwardingMessageIds.first()}"
+                    } else {
+                        "Forward ${state.forwardingMessageIds.size} messages"
+                    },
                     style = MaterialTheme.typography.labelLarge,
                 )
                 if (state.availableForwardTargets.isEmpty()) {
@@ -215,7 +248,7 @@ fun ChatScreen(
             val header = if (state.editingMessage != null) {
                 "Editing message #${state.editingMessage.id}"
             } else {
-                "Reply to #${state.replyToMessage?.id}"
+                "Reply to ${state.replyToMessage?.senderDisplayName ?: "#${state.replyToMessage?.id}"}"
             }
             Row(
                 modifier = Modifier
@@ -336,6 +369,7 @@ private fun MessageBubble(
     isSelected: Boolean,
     reactions: List<ru.daemonlord.messenger.domain.message.model.MessageReaction>,
     onAttachmentImageClick: (String) -> Unit,
+    onClick: () -> Unit,
     onLongPress: () -> Unit,
 ) {
     val isOutgoing = message.isOutgoing
@@ -353,7 +387,7 @@ private fun MessageBubble(
                     if (isSelected) MaterialTheme.colorScheme.tertiaryContainer else bubbleColor
                 )
                 .combinedClickable(
-                    onClick = {},
+                    onClick = onClick,
                     onLongClick = onLongPress,
                 )
                 .padding(horizontal = 10.dp, vertical = 8.dp),

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

@@ -18,6 +18,7 @@ import ru.daemonlord.messenger.domain.common.AppResult
 import ru.daemonlord.messenger.domain.message.model.MessageItem
 import ru.daemonlord.messenger.domain.message.usecase.DeleteMessageUseCase
 import ru.daemonlord.messenger.domain.message.usecase.EditMessageUseCase
+import ru.daemonlord.messenger.domain.message.usecase.ForwardMessageBulkUseCase
 import ru.daemonlord.messenger.domain.message.usecase.ForwardMessageUseCase
 import ru.daemonlord.messenger.domain.message.usecase.ListMessageReactionsUseCase
 import ru.daemonlord.messenger.domain.message.usecase.LoadMoreMessagesUseCase
@@ -46,6 +47,7 @@ class ChatViewModel @Inject constructor(
     private val markMessageDeliveredUseCase: MarkMessageDeliveredUseCase,
     private val markMessageReadUseCase: MarkMessageReadUseCase,
     private val forwardMessageUseCase: ForwardMessageUseCase,
+    private val forwardMessageBulkUseCase: ForwardMessageBulkUseCase,
     private val listMessageReactionsUseCase: ListMessageReactionsUseCase,
     private val toggleMessageReactionUseCase: ToggleMessageReactionUseCase,
     private val observeChatUseCase: ObserveChatUseCase,
@@ -203,7 +205,8 @@ class ChatViewModel @Inject constructor(
     }
 
     fun onForwardSelected() {
-        val message = getFocusedSelectedMessage() ?: return
+        val selectedIds = selectedForwardMessageIds()
+        if (selectedIds.isEmpty()) return
         viewModelScope.launch {
             val targets = observeChatsUseCase(archived = false)
                 .first()
@@ -214,7 +217,7 @@ class ChatViewModel @Inject constructor(
                 .toList()
             _uiState.update {
                 it.copy(
-                    forwardingMessage = message,
+                    forwardingMessageIds = selectedIds,
                     availableForwardTargets = targets,
                     selectedMessage = null,
                     selectedCanEdit = false,
@@ -229,7 +232,7 @@ class ChatViewModel @Inject constructor(
     fun onForwardDismiss() {
         _uiState.update {
             it.copy(
-                forwardingMessage = null,
+                forwardingMessageIds = emptySet(),
                 availableForwardTargets = emptyList(),
                 isForwarding = false,
             )
@@ -237,26 +240,28 @@ class ChatViewModel @Inject constructor(
     }
 
     fun onForwardTargetSelected(targetChatId: Long) {
-        val message = uiState.value.forwardingMessage ?: return
+        val messageIds = uiState.value.forwardingMessageIds.toList().sorted()
+        if (messageIds.isEmpty()) return
         viewModelScope.launch {
             _uiState.update { it.copy(isForwarding = true, errorMessage = null) }
-            when (val result = forwardMessageUseCase(messageId = message.id, targetChatId = targetChatId)) {
-                is AppResult.Success -> {
-                    _uiState.update {
-                        it.copy(
-                            isForwarding = false,
-                            forwardingMessage = null,
-                            availableForwardTargets = emptyList(),
-                        )
-                    }
+            val result = if (messageIds.size == 1) {
+                forwardMessageUseCase(messageId = messageIds.first(), targetChatId = targetChatId)
+            } else {
+                forwardMessagesBulk(messageIds = messageIds, targetChatId = targetChatId)
+            }
+            when (result) {
+                is AppResult.Success -> _uiState.update {
+                    it.copy(
+                        isForwarding = false,
+                        forwardingMessageIds = emptySet(),
+                        availableForwardTargets = emptyList(),
+                    )
                 }
-                is AppResult.Error -> {
-                    _uiState.update {
-                        it.copy(
-                            isForwarding = false,
-                            errorMessage = result.reason.toUiMessage(),
-                        )
-                    }
+                is AppResult.Error -> _uiState.update {
+                    it.copy(
+                        isForwarding = false,
+                        errorMessage = result.reason.toUiMessage(),
+                    )
                 }
             }
         }
@@ -496,6 +501,32 @@ class ChatViewModel @Inject constructor(
         }
     }
 
+    private fun selectedForwardMessageIds(): Set<Long> {
+        val state = uiState.value.actionState
+        if (state.mode == MessageSelectionMode.MULTI && state.selectedMessageIds.isNotEmpty()) {
+            return state.selectedMessageIds
+        }
+        return getFocusedSelectedMessage()?.let { setOf(it.id) }.orEmpty()
+    }
+
+    private suspend fun forwardMessagesBulk(
+        messageIds: List<Long>,
+        targetChatId: Long,
+    ): AppResult<Unit> {
+        messageIds.forEach { messageId ->
+            when (
+                val result = forwardMessageBulkUseCase(
+                    messageId = messageId,
+                    targetChatIds = listOf(targetChatId),
+                )
+            ) {
+                is AppResult.Success -> Unit
+                is AppResult.Error -> return result
+            }
+        }
+        return AppResult.Success(Unit)
+    }
+
     private fun findMessageById(messageId: Long): MessageItem? {
         return uiState.value.messages.firstOrNull { it.id == messageId }
     }

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

@@ -18,7 +18,7 @@ data class MessageUiState(
     val selectedCanEdit: Boolean = false,
     val selectedCanDeleteForAll: Boolean = false,
     val reactionByMessageId: Map<Long, List<MessageReaction>> = emptyMap(),
-    val forwardingMessage: MessageItem? = null,
+    val forwardingMessageIds: Set<Long> = emptySet(),
     val availableForwardTargets: List<ForwardTargetUiModel> = emptyList(),
     val isForwarding: Boolean = false,
     val canSendMessages: Boolean = true,