feat: Implement avatar sending functionality and update MediaPicker with avatar selection option

app/src/main/java/com/rosetta/messenger/ui/chats/ChatDetailScreen.kt

@@ -1967,6 +1967,7 @@ fun ChatDetailScreen(
                 isVisible = showMediaPicker,
                 onDismiss = { showMediaPicker = false },
                 isDarkTheme = isDarkTheme,
+                currentUserPublicKey = currentUserPublicKey,
                 onMediaSelected = { selectedMedia ->
                         // 📸 Отправляем выбранные изображения как коллаж (группу)
                         android.util.Log.d("ChatDetailScreen", "📸 Sending ${selectedMedia.size} media items as group")
@@ -2015,6 +2016,11 @@ fun ChatDetailScreen(
                 onOpenFilePicker = {
                         // 📄 Открываем файловый пикер
                         filePickerLauncher.launch("*/*")
+                },
+                onAvatarClick = {
+                        // 👤 Отправляем свой аватар (как в desktop)
+                        android.util.Log.d("ChatDetailScreen", "👤 Sending avatar...")
+                        viewModel.sendAvatarMessage()
                 }
         )
 }

app/src/main/java/com/rosetta/messenger/ui/chats/ChatViewModel.kt

@@ -1,6 +1,9 @@
 package com.rosetta.messenger.ui.chats
 
 import android.app.Application
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.util.Base64
 import android.util.Log
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
@@ -797,8 +800,9 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
                 val attachmentId = attachment.optString("id", "")
                 val attachmentType = AttachmentType.fromInt(type)
                 
-                // 💾 Для IMAGE - пробуем загрузить blob из файла если пустой
+                // 💾 Для IMAGE и AVATAR - пробуем загрузить blob из файла если пустой
-                if (attachmentType == AttachmentType.IMAGE && blob.isEmpty() && attachmentId.isNotEmpty()) {
+                if ((attachmentType == AttachmentType.IMAGE || attachmentType == AttachmentType.AVATAR) 
+                    && blob.isEmpty() && attachmentId.isNotEmpty()) {
                     val fileBlob = AttachmentFileManager.readAttachment(
                         context = getApplication(),
                         attachmentId = attachmentId,
@@ -1809,6 +1813,219 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         }
     }
     
+    /**
+     * Отправка аватарки пользователя
+     * По аналогии с desktop - отправляет текущий аватар как вложение
+     */
+    fun sendAvatarMessage() {
+        val recipient = opponentKey
+        val sender = myPublicKey
+        val userPrivateKey = myPrivateKey
+        
+        if (recipient == null || sender == null || userPrivateKey == null) {
+            Log.e(TAG, "👤 Cannot send avatar: missing keys")
+            return
+        }
+        if (isSending) {
+            Log.w(TAG, "👤 Already sending message")
+            return
+        }
+        
+        isSending = true
+        
+        val messageId = UUID.randomUUID().toString().replace("-", "").take(32)
+        val timestamp = System.currentTimeMillis()
+        
+        viewModelScope.launch(Dispatchers.IO) {
+            try {
+                Log.d(TAG, "👤 Fetching current user avatar...")
+                // Получаем свой аватар из AvatarRepository
+                val avatarDao = database.avatarDao()
+                val myAvatar = avatarDao.getLatestAvatar(sender)
+                
+                if (myAvatar == null) {
+                    Log.w(TAG, "👤 No avatar found for current user")
+                    withContext(Dispatchers.Main) {
+                        android.widget.Toast.makeText(
+                            getApplication(),
+                            "No avatar to send",
+                            android.widget.Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                    isSending = false
+                    return@launch
+                }
+                
+                Log.d(TAG, "👤 Found avatar, path: ${myAvatar.avatar}")
+                // Читаем и расшифровываем аватар
+                val avatarBlob = com.rosetta.messenger.utils.AvatarFileManager.readAvatar(
+                    getApplication(),
+                    myAvatar.avatar
+                )
+                
+                if (avatarBlob == null || avatarBlob.isEmpty()) {
+                    Log.w(TAG, "👤 Avatar blob is null or empty!")
+                    withContext(Dispatchers.Main) {
+                        android.widget.Toast.makeText(
+                            getApplication(),
+                            "Failed to read avatar",
+                            android.widget.Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                    isSending = false
+                    return@launch
+                }
+                
+                Log.d(TAG, "👤 Avatar blob read successfully, length: ${avatarBlob.length}")
+                
+                // Генерируем blurhash для preview (как на desktop)
+                val avatarBlurhash = withContext(Dispatchers.IO) {
+                    try {
+                        val bitmap = base64ToBitmap(avatarBlob)
+                        if (bitmap != null) {
+                            com.rosetta.messenger.utils.MediaUtils.generateBlurhashFromBitmap(bitmap)
+                        } else {
+                            ""
+                        }
+                    } catch (e: Exception) {
+                        Log.e(TAG, "Failed to generate blurhash for avatar: ${e.message}")
+                        ""
+                    }
+                }
+                Log.d(TAG, "👤 Avatar blurhash generated: ${avatarBlurhash.take(20)}...")
+                
+                // 1. 🚀 Optimistic UI
+                val optimisticMessage = ChatMessage(
+                    id = messageId,
+                    text = "",
+                    isOutgoing = true,
+                    timestamp = Date(timestamp),
+                    status = MessageStatus.SENDING,
+                    attachments = listOf(
+                        MessageAttachment(
+                            id = "avatar_$timestamp",
+                            type = AttachmentType.AVATAR,
+                            preview = avatarBlurhash,
+                            blob = avatarBlob  // Для локального отображения
+                        )
+                    )
+                )
+                withContext(Dispatchers.Main) {
+                    _messages.value = _messages.value + optimisticMessage
+                }
+                
+                // 2. Шифрование текста (пустой текст для аватарки)
+                val encryptResult = MessageCrypto.encryptForSending("", recipient)
+                val encryptedContent = encryptResult.ciphertext
+                val encryptedKey = encryptResult.encryptedKey
+                val plainKeyAndNonce = encryptResult.plainKeyAndNonce
+                
+                val privateKeyHash = CryptoManager.generatePrivateKeyHash(userPrivateKey)
+                
+                // 🔥 КРИТИЧНО: Как в desktop - шифруем аватар с ChaCha ключом (plainKeyAndNonce)
+                // НЕ с AVATAR_PASSWORD! AVATAR_PASSWORD используется только для локального хранения
+                val encryptedAvatarBlob = MessageCrypto.encryptReplyBlob(avatarBlob, plainKeyAndNonce)
+                Log.d(TAG, "👤 Avatar encrypted with ChaCha key, length: ${encryptedAvatarBlob.length}")
+                
+                val avatarAttachmentId = "avatar_$timestamp"
+                
+                // 📤 Загружаем на Transport Server (как в desktop!)
+                val isSavedMessages = (sender == recipient)
+                var uploadTag = ""
+                
+                if (!isSavedMessages) {
+                    Log.d(TAG, "👤 📤 Uploading avatar to Transport Server...")
+                    uploadTag = TransportManager.uploadFile(avatarAttachmentId, encryptedAvatarBlob)
+                    Log.d(TAG, "👤 📤 Upload complete, tag: $uploadTag")
+                }
+                
+                // Preview содержит tag::blurhash (как в desktop)
+                val previewWithTag = if (uploadTag.isNotEmpty()) "$uploadTag::$avatarBlurhash" else avatarBlurhash
+                Log.d(TAG, "👤 Preview with tag: ${previewWithTag.take(50)}...")
+                
+                val avatarAttachment = MessageAttachment(
+                    id = avatarAttachmentId,
+                    blob = "",  // 🔥 ПУСТОЙ blob - файл на Transport Server!
+                    type = AttachmentType.AVATAR,
+                    preview = previewWithTag
+                )
+                
+                // 3. Отправляем пакет (с ПУСТЫМ blob!)
+                val packet = PacketMessage().apply {
+                    fromPublicKey = sender
+                    toPublicKey = recipient
+                    content = encryptedContent
+                    chachaKey = encryptedKey
+                    this.timestamp = timestamp
+                    this.privateKey = privateKeyHash
+                    this.messageId = messageId
+                    attachments = listOf(avatarAttachment)
+                }
+                
+                if (!isSavedMessages) {
+                    ProtocolManager.send(packet)
+                }
+                
+                withContext(Dispatchers.Main) {
+                    updateMessageStatus(messageId, MessageStatus.SENT)
+                }
+                
+                // 💾 Сохраняем аватар в файл локально (как IMAGE - с приватным ключом)
+                AttachmentFileManager.saveAttachment(
+                    context = getApplication(),
+                    blob = avatarBlob,
+                    attachmentId = avatarAttachmentId,
+                    publicKey = sender,
+                    privateKey = userPrivateKey
+                )
+                
+                // 4. 💾 Сохраняем в БД (БЕЗ blob - он в файле)
+                val attachmentJson = JSONObject().apply {
+                    put("id", avatarAttachmentId)
+                    put("type", AttachmentType.AVATAR.value)
+                    put("preview", previewWithTag)  // tag::blurhash
+                    put("blob", "")  // Пустой blob - не сохраняем в БД!
+                }
+                
+                messageDao.insertMessage(
+                    MessageEntity(
+                        account = sender,
+                        fromPublicKey = sender,
+                        toPublicKey = recipient,
+                        content = encryptedContent,
+                        timestamp = timestamp,
+                        chachaKey = encryptedKey,
+                        read = 1,
+                        fromMe = 1,
+                        delivered = DeliveryStatus.DELIVERED.value,
+                        messageId = messageId,
+                        plainMessage = "",
+                        attachments = JSONArray().apply { put(attachmentJson) }.toString(),
+                        replyToMessageId = null,
+                        dialogKey = if (sender < recipient) "${sender}_${recipient}" else "${recipient}_${sender}"
+                    )
+                )
+                
+                saveDialog("Photo", timestamp)
+                
+                Log.d(TAG, "👤 ✅ Avatar message sent successfully!")
+                
+            } catch (e: Exception) {
+                Log.e(TAG, "👤 ❌ Failed to send avatar message", e)
+                withContext(Dispatchers.Main) {
+                    updateMessageStatus(messageId, MessageStatus.SENT)
+                    android.widget.Toast.makeText(
+                        getApplication(),
+                        "Failed to send avatar: ${e.message}",
+                        android.widget.Toast.LENGTH_SHORT
+                    ).show()
+                }
+            } finally {
+                isSending = false
+            }
+        }
+    }
+    
     /**
      * Сохранить диалог в базу данных
      * 🔥 Используем updateDialogFromMessages для пересчета счетчиков из messages
@@ -2130,6 +2347,24 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         }
     }
     
+    /**
+     * Вспомогательная функция для конвертации base64 в Bitmap
+     */
+    private fun base64ToBitmap(base64: String): Bitmap? {
+        return try {
+            val cleanBase64 = if (base64.contains(",")) {
+                base64.substringAfter(",")
+            } else {
+                base64
+            }
+            val bytes = Base64.decode(cleanBase64, Base64.DEFAULT)
+            BitmapFactory.decodeByteArray(bytes, 0, bytes.size)
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to decode base64 to bitmap: ${e.message}")
+            null
+        }
+    }
+    
     override fun onCleared() {
         super.onCleared()
         lastReadMessageTimestamp = 0L

app/src/main/java/com/rosetta/messenger/ui/chats/components/AttachmentComponents.kt

@@ -1079,14 +1079,11 @@ fun AvatarAttachment(
                     val encryptedContent = TransportManager.downloadFile(attachment.id, downloadTag)
                     downloadStatus = DownloadStatus.DECRYPTING
                     
-                    // КРИТИЧНО: chachaKey ЗАШИФРОВАН в БД (как в Desktop)
+                    // 🔥 КРИТИЧНО: Аватар зашифрован с AVATAR_PASSWORD (как на desktop)
-                    // Сначала расшифровываем его
+                    // НЕ используем ChaCha ключ сообщения!
-                    val decryptedKeyAndNonce = MessageCrypto.decryptKeyFromSender(chachaKey, privateKey)
+                    val decrypted = CryptoManager.decryptWithPassword(
-                    val decryptKeyString = String(decryptedKeyAndNonce, Charsets.UTF_8)
-                    
-                    val decrypted = MessageCrypto.decryptAttachmentBlobWithPassword(
                         encryptedContent,
-                        decryptKeyString
+                        AvatarFileManager.getAvatarPassword()
                     )
                     
                     if (decrypted != null) {

app/src/main/java/com/rosetta/messenger/ui/chats/components/MediaPickerBottomSheet.kt

@@ -72,6 +72,8 @@ fun MediaPickerBottomSheet(
     onMediaSelected: (List<MediaItem>) -> Unit,
     onOpenCamera: () -> Unit = {},
     onOpenFilePicker: () -> Unit = {},
+    onAvatarClick: () -> Unit = {},
+    currentUserPublicKey: String = "",
     maxSelection: Int = 10
 ) {
     val context = LocalContext.current
@@ -179,7 +181,7 @@ fun MediaPickerBottomSheet(
                     textColor = textColor
                 )
                 
-                // Quick action buttons row (Camera, Gallery, File, Location, etc.)
+                // Quick action buttons row (Camera, Gallery, File, Avatar, etc.)
                 QuickActionsRow(
                     isDarkTheme = isDarkTheme,
                     onCameraClick = {
@@ -189,6 +191,10 @@ fun MediaPickerBottomSheet(
                     onFileClick = {
                         onDismiss()
                         onOpenFilePicker()
+                    },
+                    onAvatarClick = {
+                        onDismiss()
+                        onAvatarClick()
                     }
                 )
                 
@@ -374,7 +380,8 @@ private fun MediaPickerHeader(
 private fun QuickActionsRow(
     isDarkTheme: Boolean,
     onCameraClick: () -> Unit,
-    onFileClick: () -> Unit
+    onFileClick: () -> Unit,
+    onAvatarClick: () -> Unit
 ) {
     val buttonColor = if (isDarkTheme) Color(0xFF2C2C2E) else Color(0xFFF2F2F7)
     val iconColor = if (isDarkTheme) Color.White else Color.Black
@@ -395,6 +402,15 @@ private fun QuickActionsRow(
             onClick = onCameraClick
         )
         
+        // Avatar button
+        QuickActionButton(
+            icon = TablerIcons.User,
+            label = "Avatar",
+            backgroundColor = buttonColor,
+            iconColor = iconColor,
+            onClick = onAvatarClick
+        )
+        
         // File button
         QuickActionButton(
             icon = TablerIcons.File,

app/src/main/java/com/rosetta/messenger/utils/AvatarFileManager.kt

@@ -23,6 +23,11 @@ object AvatarFileManager {
     private const val MAX_IMAGE_SIZE = 2048 // Максимальный размер изображения в пикселях
     private const val JPEG_QUALITY = 85 // Качество JPEG сжатия
     
+    /**
+     * Получить пароль для шифрования аватаров (для совместимости с desktop)
+     */
+    fun getAvatarPassword(): String = AVATAR_PASSWORD
+    
     /**
      * Сохранить аватар в файловую систему
      * @param context Android context