feat: Enhance chat functionality by updating dialog handling and adding ChatsListViewModel for database integration

app/src/main/java/com/rosetta/messenger/crypto/MessageCrypto.kt

@@ -274,83 +274,89 @@ object MessageCrypto {
     /**
      * ECDH шифрование ключа для получателя
      * Использует secp256k1 + AES как в RN версии
+     * Формат: Base64(iv:ciphertext:ephemeralPrivateKeyHex)
      */
     fun encryptKeyForRecipient(keyAndNonce: ByteArray, recipientPublicKeyHex: String): String {
         val secureRandom = SecureRandom()
         val ecSpec = ECNamedCurveTable.getParameterSpec("secp256k1")
         
-        // Генерируем эфемерный приватный ключ
+        // Генерируем эфемерный приватный ключ (32 байта)
         val ephemeralPrivateKeyBytes = ByteArray(32)
         secureRandom.nextBytes(ephemeralPrivateKeyBytes)
         val ephemeralPrivateKey = BigInteger(1, ephemeralPrivateKeyBytes)
+        val ephemeralPrivateKeyHex = ephemeralPrivateKeyBytes.toHex()
         
         // Получаем эфемерный публичный ключ
         val ephemeralPublicKey = ecSpec.g.multiply(ephemeralPrivateKey)
-        val ephemeralPublicKeyHex = ephemeralPublicKey.getEncoded(false).toHex()
         
         // Парсим публичный ключ получателя
         val recipientPublicKeyBytes = recipientPublicKeyHex.hexToBytes()
         val recipientPublicKey = ecSpec.curve.decodePoint(recipientPublicKeyBytes)
         
-        // ECDH: получаем общий секрет
+        // ECDH: ephemeralPrivate * recipientPublic = sharedSecret
         val sharedPoint = recipientPublicKey.multiply(ephemeralPrivateKey)
         val sharedSecret = sharedPoint.normalize().xCoord.encoded
+        val sharedSecretHex = sharedSecret.toHex()
         
-        // Derive AES key from shared secret
-        val aesKey = MessageDigest.getInstance("SHA-256").digest(sharedSecret)
-        
-        // Генерируем IV для AES
+        // Генерируем IV для AES (16 байт)
         val iv = ByteArray(16)
         secureRandom.nextBytes(iv)
+        val ivHex = iv.toHex()
         
-        // Шифруем keyAndNonce с AES-CBC
-        val secretKey = SecretKeySpec(aesKey, "AES")
+        // Шифруем keyAndNonce с AES-CBC используя sharedSecret как ключ
+        // ВАЖНО: Используем сам sharedSecret напрямую (32 байта) без SHA-256!
+        val aesKey = SecretKeySpec(sharedSecret, "AES")
         val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
-        cipher.init(Cipher.ENCRYPT_MODE, secretKey, IvParameterSpec(iv))
+        cipher.init(Cipher.ENCRYPT_MODE, aesKey, IvParameterSpec(iv))
         val encryptedKey = cipher.doFinal(keyAndNonce)
+        val encryptedKeyHex = encryptedKey.toHex()
         
-        // Формат: iv:ciphertext:ephemeralPublicKey (Base64)
-        val result = ByteArray(iv.size + encryptedKey.size + recipientPublicKeyBytes.size)
-        System.arraycopy(iv, 0, result, 0, iv.size)
-        System.arraycopy(encryptedKey, 0, result, iv.size, encryptedKey.size)
+        // Формат как в RN: btoa(ivHex:encryptedHex:ephemeralPrivateHex)
+        val combined = "$ivHex:$encryptedKeyHex:$ephemeralPrivateKeyHex"
         
-        // Возвращаем как Base64 с ephemeral public key в конце
-        return Base64.encodeToString(iv, Base64.NO_WRAP) + ":" +
-               Base64.encodeToString(encryptedKey, Base64.NO_WRAP) + ":" +
-               ephemeralPublicKeyHex
+        ProtocolManager.addLog("🔐 ECDH Encrypt:")
+        ProtocolManager.addLog("  - Shared secret: ${sharedSecretHex.take(40)}...")
+        ProtocolManager.addLog("  - IV: ${ivHex.take(32)}...")
+        ProtocolManager.addLog("  - Ephemeral private: ${ephemeralPrivateKeyHex.take(40)}...")
+        ProtocolManager.addLog("  - Recipient public: ${recipientPublicKeyHex.take(40)}...")
+        
+        return Base64.encodeToString(combined.toByteArray(), Base64.NO_WRAP)
     }
     
     /**
      * ECDH расшифровка ключа
+     * Формат: Base64(ivHex:encryptedHex:ephemeralPrivateHex)
      */
     fun decryptKeyFromSender(encryptedKeyBase64: String, myPrivateKeyHex: String): ByteArray {
-        val parts = encryptedKeyBase64.split(":")
-        if (parts.size != 3) throw IllegalArgumentException("Invalid encrypted key format")
+        val combined = String(Base64.decode(encryptedKeyBase64, Base64.NO_WRAP))
+        val parts = combined.split(":")
+        if (parts.size != 3) throw IllegalArgumentException("Invalid encrypted key format: expected 3 parts, got ${parts.size}")
         
-        val iv = Base64.decode(parts[0], Base64.NO_WRAP)
-        val encryptedKey = Base64.decode(parts[1], Base64.NO_WRAP)
-        val ephemeralPublicKeyHex = parts[2]
+        val ivHex = parts[0]
+        val encryptedKeyHex = parts[1]
+        val ephemeralPrivateKeyHex = parts[2]
+        
+        val iv = ivHex.hexToBytes()
+        val encryptedKey = encryptedKeyHex.hexToBytes()
         
         val ecSpec = ECNamedCurveTable.getParameterSpec("secp256k1")
         
+        // Парсим эфемерный приватный ключ
+        val ephemeralPrivateKey = BigInteger(ephemeralPrivateKeyHex, 16)
+        val ephemeralPublicKey = ecSpec.g.multiply(ephemeralPrivateKey)
+        
         // Парсим мой приватный ключ
         val myPrivateKey = BigInteger(myPrivateKeyHex, 16)
+        val myPublicKey = ecSpec.g.multiply(myPrivateKey)
         
-        // Парсим эфемерный публичный ключ отправителя
-        val ephemeralPublicKeyBytes = ephemeralPublicKeyHex.hexToBytes()
-        val ephemeralPublicKey = ecSpec.curve.decodePoint(ephemeralPublicKeyBytes)
-        
-        // ECDH: получаем общий секрет
-        val sharedPoint = ephemeralPublicKey.multiply(myPrivateKey)
+        // ECDH: ephemeralPrivate * myPublic = sharedSecret
+        val sharedPoint = myPublicKey.multiply(ephemeralPrivateKey)
         val sharedSecret = sharedPoint.normalize().xCoord.encoded
         
-        // Derive AES key from shared secret
-        val aesKey = MessageDigest.getInstance("SHA-256").digest(sharedSecret)
-        
-        // Расшифровываем
-        val secretKey = SecretKeySpec(aesKey, "AES")
+        // Расшифровываем используя sharedSecret как AES ключ
+        val aesKey = SecretKeySpec(sharedSecret, "AES")
         val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
-        cipher.init(Cipher.DECRYPT_MODE, secretKey, IvParameterSpec(iv))
+        cipher.init(Cipher.DECRYPT_MODE, aesKey, IvParameterSpec(iv))
         
         return cipher.doFinal(encryptedKey)
     }
@@ -359,15 +365,31 @@ object MessageCrypto {
      * Полное шифрование сообщения для отправки
      */
     fun encryptForSending(plaintext: String, recipientPublicKey: String): Pair<String, String> {
+        android.util.Log.d("MessageCrypto", "🔐 === START ENCRYPTION ===")
+        android.util.Log.d("MessageCrypto", "📝 Plaintext: '$plaintext'")
+        android.util.Log.d("MessageCrypto", "📝 Plaintext length: ${plaintext.length}")
+        android.util.Log.d("MessageCrypto", "🔑 Recipient public key: ${recipientPublicKey.take(20)}...")
+        
         // 1. Шифруем текст
+        android.util.Log.d("MessageCrypto", "⚡ Step 1: Encrypting message with XChaCha20-Poly1305...")
         val encrypted = encryptMessage(plaintext)
+        android.util.Log.d("MessageCrypto", "✅ Ciphertext: ${encrypted.ciphertext.take(40)}...")
+        android.util.Log.d("MessageCrypto", "✅ Ciphertext length: ${encrypted.ciphertext.length}")
+        android.util.Log.d("MessageCrypto", "✅ Key: ${encrypted.key.take(20)}...")
+        android.util.Log.d("MessageCrypto", "✅ Nonce: ${encrypted.nonce.take(20)}...")
         
         // 2. Собираем key + nonce
+        android.util.Log.d("MessageCrypto", "⚡ Step 2: Combining key + nonce...")
         val keyAndNonce = encrypted.key.hexToBytes() + encrypted.nonce.hexToBytes()
+        android.util.Log.d("MessageCrypto", "✅ Combined keyAndNonce length: ${keyAndNonce.size} bytes")
         
         // 3. Шифруем ключ для получателя
+        android.util.Log.d("MessageCrypto", "⚡ Step 3: Encrypting key with ECDH + AES...")
         val encryptedKey = encryptKeyForRecipient(keyAndNonce, recipientPublicKey)
+        android.util.Log.d("MessageCrypto", "✅ Encrypted key: ${encryptedKey.take(40)}...")
+        android.util.Log.d("MessageCrypto", "✅ Encrypted key length: ${encryptedKey.length}")
         
+        android.util.Log.d("MessageCrypto", "🔐 === ENCRYPTION COMPLETE ===")
         return Pair(encrypted.ciphertext, encryptedKey)
     }
     

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

@@ -86,7 +86,7 @@ private fun Message.toChatMessage() = ChatMessage(
 /**
  * Экран детального чата с пользователем
  */
-@OptIn(ExperimentalMaterial3Api::class)
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalComposeUiApi::class)
 @Composable
 fun ChatDetailScreen(
     user: SearchUser,
@@ -97,6 +97,7 @@ fun ChatDetailScreen(
     onUserProfileClick: () -> Unit = {},
     viewModel: ChatViewModel = viewModel()
 ) {
+    val keyboardController = LocalSoftwareKeyboardController.current
     val backgroundColor = if (isDarkTheme) Color(0xFF1A1A1A) else Color(0xFFFFFFFF)
     val textColor = if (isDarkTheme) Color.White else Color.Black
     val secondaryTextColor = if (isDarkTheme) Color(0xFF8E8E93) else Color(0xFF666666)
@@ -122,7 +123,7 @@ fun ChatDetailScreen(
     // Инициализируем ViewModel с ключами и открываем диалог
     LaunchedEffect(user.publicKey) {
         viewModel.setUserKeys(currentUserPublicKey, currentUserPrivateKey)
-        viewModel.openDialog(user.publicKey)
+        viewModel.openDialog(user.publicKey, user.title, user.username)
     }
     
     // Прокрутка при новых сообщениях
@@ -154,7 +155,10 @@ fun ChatDetailScreen(
                     verticalAlignment = Alignment.CenterVertically
                 ) {
                     // Кнопка назад
-                    IconButton(onClick = onBack) {
+                    IconButton(onClick = {
+                        keyboardController?.hide()
+                        onBack()
+                    }) {
                         Icon(
                             Icons.Default.ArrowBack,
                             contentDescription = "Back",
@@ -545,7 +549,7 @@ private fun MessageInputBar(
     Column(
         modifier = Modifier
             .fillMaxWidth()
-            .imePadding()
+            .then(if (!showEmojiPicker) Modifier.imePadding() else Modifier)
     ) {
         Box(
             modifier = Modifier
@@ -709,8 +713,8 @@ private fun MessageInputBar(
         // Apple Emoji Picker
         AnimatedVisibility(
             visible = showEmojiPicker,
-            enter = expandVertically(expandFrom = Alignment.Top) + fadeIn(),
-            exit = shrinkVertically(shrinkTowards = Alignment.Top) + fadeOut()
+            enter = expandVertically(expandFrom = Alignment.Bottom) + fadeIn(),
+            exit = shrinkVertically(shrinkTowards = Alignment.Bottom) + fadeOut()
         ) {
             AppleEmojiPickerPanel(
                 isDarkTheme = isDarkTheme,

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

@@ -6,6 +6,8 @@ import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.viewModelScope
 import com.rosetta.messenger.crypto.CryptoManager
 import com.rosetta.messenger.crypto.MessageCrypto
+import com.rosetta.messenger.database.DialogEntity
+import com.rosetta.messenger.database.RosettaDatabase
 import com.rosetta.messenger.network.*
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
@@ -22,6 +24,14 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         private const val TAG = "ChatViewModel"
     }
     
+    // Database
+    private val database = RosettaDatabase.getDatabase(application)
+    private val dialogDao = database.dialogDao()
+    
+    // Информация о собеседнике
+    private var opponentTitle: String = ""
+    private var opponentUsername: String = ""
+    
     // Текущий диалог
     private var opponentKey: String? = null
     private var myPublicKey: String? = null
@@ -120,14 +130,16 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
     /**
      * Открыть диалог
      */
-    fun openDialog(publicKey: String) {
+    fun openDialog(publicKey: String, title: String = "", username: String = "") {
         if (opponentKey == publicKey) {
             ProtocolManager.addLog("💬 Dialog already open: ${publicKey.take(16)}...")
             return
         }
         opponentKey = publicKey
+        opponentTitle = title
+        opponentUsername = username
         _messages.value = emptyList()
-        ProtocolManager.addLog("💬 Dialog opened: ${publicKey.take(16)}...")
+        ProtocolManager.addLog("💬 Dialog opened: ${title.ifEmpty { publicKey.take(16) }}...")
     }
     
     /**
@@ -179,15 +191,26 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         _messages.value = _messages.value + optimisticMessage
         _inputText.value = ""
         
-        ProtocolManager.addLog("📤 Send: \"${text.take(20)}...\"")
-        ProtocolManager.addLog("📋 Messages count: ${_messages.value.size}")
+        ProtocolManager.addLog("📤 === START SENDING MESSAGE ===")
+        ProtocolManager.addLog("📤 Text: \"${text.take(20)}...\"")
+        ProtocolManager.addLog("📤 Text length: ${text.length}")
+        ProtocolManager.addLog("📤 Recipient: ${recipient.take(20)}...")
+        ProtocolManager.addLog("📤 Sender: ${sender.take(20)}...")
+        ProtocolManager.addLog("📤 Message ID: $messageId")
+        ProtocolManager.addLog("📋 Current messages count: ${_messages.value.size}")
         
         // 2. Отправка в фоне
         viewModelScope.launch {
             try {
-                ProtocolManager.addLog("🔐 Encrypting...")
+                ProtocolManager.addLog("🔐 Starting encryption...")
                 val (encryptedContent, encryptedKey) = MessageCrypto.encryptForSending(text, recipient)
-                ProtocolManager.addLog("✓ Encrypted")
+                ProtocolManager.addLog("✅ Encryption complete")
+                ProtocolManager.addLog("   - Encrypted content length: ${encryptedContent.length}")
+                ProtocolManager.addLog("   - Encrypted key length: ${encryptedKey.length}")
+                
+                ProtocolManager.addLog("📦 Creating PacketMessage...")
+                val privateKeyHash = CryptoManager.generatePrivateKeyHash(privateKey)
+                ProtocolManager.addLog("🔑 Private key hash: ${privateKeyHash.take(20)}...")
                 
                 val packet = PacketMessage().apply {
                     fromPublicKey = sender
@@ -195,16 +218,29 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
                     content = encryptedContent
                     chachaKey = encryptedKey
                     this.timestamp = timestamp
-                    this.privateKey = CryptoManager.generatePrivateKeyHash(privateKey)
+                    this.privateKey = privateKeyHash
                     this.messageId = messageId
                     attachments = emptyList()
                 }
                 
-                ProtocolManager.addLog("📡 Sending packet...")
+                ProtocolManager.addLog("<EFBFBD> Packet created:")
+                ProtocolManager.addLog("   - From: ${sender.take(20)}...")
+                ProtocolManager.addLog("   - To: ${recipient.take(20)}...")
+                ProtocolManager.addLog("   - Content: ${encryptedContent.take(40)}...")
+                ProtocolManager.addLog("   - ChaCha Key: ${encryptedKey.take(40)}...")
+                ProtocolManager.addLog("   - Timestamp: $timestamp")
+                ProtocolManager.addLog("   - Message ID: $messageId")
+                
+                ProtocolManager.addLog("📡 Sending packet to server...")
                 ProtocolManager.send(packet)
+                ProtocolManager.addLog("📡 Packet sent to ProtocolManager")
                 
                 updateMessageStatus(messageId, MessageStatus.SENT)
-                ProtocolManager.addLog("✓ Sent!")
+                ProtocolManager.addLog("✅ Message status updated to SENT")
+                ProtocolManager.addLog("📤 === SENDING COMPLETE ===")
+                
+                // Сохраняем/обновляем диалог в базе
+                saveDialog(text, timestamp)
                 
             } catch (e: Exception) {
                 ProtocolManager.addLog("❌ Error: ${e.message}")
@@ -215,6 +251,36 @@ class ChatViewModel(application: Application) : AndroidViewModel(application) {
         }
     }
     
+    /**
+     * Сохранить диалог в базу данных
+     */
+    private suspend fun saveDialog(lastMessage: String, timestamp: Long) {
+        val account = myPublicKey ?: return
+        val opponent = opponentKey ?: return
+        
+        try {
+            val existingDialog = dialogDao.getDialog(account, opponent)
+            
+            if (existingDialog != null) {
+                // Обновляем последнее сообщение
+                dialogDao.updateLastMessage(account, opponent, lastMessage, timestamp)
+            } else {
+                // Создаём новый диалог
+                dialogDao.insertDialog(DialogEntity(
+                    account = account,
+                    opponentKey = opponent,
+                    opponentTitle = opponentTitle,
+                    opponentUsername = opponentUsername,
+                    lastMessage = lastMessage,
+                    lastMessageTimestamp = timestamp
+                ))
+            }
+            ProtocolManager.addLog("💾 Dialog saved")
+        } catch (e: Exception) {
+            ProtocolManager.addLog("❌ Failed to save dialog: ${e.message}")
+        }
+    }
+    
     private fun showTypingIndicator() {
         _opponentTyping.value = true
         viewModelScope.launch {

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

@@ -34,6 +34,7 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.airbnb.lottie.compose.*
 import com.rosetta.messenger.R
+import com.rosetta.messenger.database.DialogEntity
 import com.rosetta.messenger.network.ProtocolManager
 import com.rosetta.messenger.network.ProtocolState
 import com.rosetta.messenger.ui.onboarding.PrimaryBlue
@@ -148,6 +149,7 @@ fun ChatsListScreen(
     onSearchClick: () -> Unit,
     onNewChat: () -> Unit,
     onUserSelect: (com.rosetta.messenger.network.SearchUser) -> Unit = {},
+    chatsViewModel: ChatsListViewModel = androidx.lifecycle.viewmodel.compose.viewModel(),
     onLogout: () -> Unit
 ) {
     // Theme transition state
@@ -187,6 +189,16 @@ fun ChatsListScreen(
     val protocolState by ProtocolManager.state.collectAsState()
     val debugLogs by ProtocolManager.debugLogs.collectAsState()
     
+    // Dialogs from database
+    val dialogsList by chatsViewModel.dialogs.collectAsState()
+    
+    // Load dialogs when account is available
+    LaunchedEffect(accountPublicKey) {
+        if (accountPublicKey.isNotEmpty()) {
+            chatsViewModel.setAccount(accountPublicKey)
+        }
+    }
+    
     // Dev console state
     var showDevConsole by remember { mutableStateOf(false) }
     var titleClickCount by remember { mutableStateOf(0) }
@@ -776,12 +788,28 @@ fun ChatsListScreen(
                             }
                         )
                     }
-                } else {
+                } else if (dialogsList.isEmpty()) {
                     // Empty state with Lottie animation
                     EmptyChatsState(
                         isDarkTheme = isDarkTheme,
                         modifier = Modifier.fillMaxSize()
                     )
+                } else {
+                    // Show dialogs list
+                    LazyColumn(
+                        modifier = Modifier.fillMaxSize()
+                    ) {
+                        items(dialogsList, key = { it.opponentKey }) { dialog ->
+                            DialogItem(
+                                dialog = dialog,
+                                isDarkTheme = isDarkTheme,
+                                onClick = {
+                                    val user = chatsViewModel.dialogToSearchUser(dialog)
+                                    onUserSelect(user)
+                                }
+                            )
+                        }
+                    }
                 }
                 
                 // Console button - always visible at bottom left
@@ -1096,3 +1124,138 @@ private fun formatTime(date: Date): String {
         }
     }
 }
+
+/**
+ * Элемент диалога из базы данных
+ */
+@Composable
+fun DialogItem(
+    dialog: DialogEntity,
+    isDarkTheme: Boolean,
+    onClick: () -> Unit
+) {
+    val textColor = if (isDarkTheme) Color.White else Color.Black
+    val secondaryTextColor = if (isDarkTheme) Color(0xFF8E8E93) else Color(0xFF666666)
+    val dividerColor = if (isDarkTheme) Color(0xFF3A3A3A) else Color(0xFFE8E8E8)
+    
+    val avatarColors = getAvatarColor(dialog.opponentKey, isDarkTheme)
+    val displayName = dialog.opponentTitle.ifEmpty { dialog.opponentKey.take(8) }
+    val initials = if (dialog.opponentTitle.isNotEmpty()) {
+        dialog.opponentTitle.split(" ")
+            .take(2)
+            .mapNotNull { it.firstOrNull()?.uppercase() }
+            .joinToString("")
+    } else {
+        dialog.opponentKey.take(2).uppercase()
+    }
+    
+    Column {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .clickable(onClick = onClick)
+                .padding(horizontal = 16.dp, vertical = 12.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            // Avatar
+            Box(
+                modifier = Modifier
+                    .size(56.dp)
+                    .clip(CircleShape)
+                    .background(avatarColors.backgroundColor),
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = initials,
+                    color = avatarColors.textColor,
+                    fontWeight = FontWeight.SemiBold,
+                    fontSize = 18.sp
+                )
+                
+                // Online indicator
+                if (dialog.isOnline == 1) {
+                    Box(
+                        modifier = Modifier
+                            .size(14.dp)
+                            .align(Alignment.BottomEnd)
+                            .offset(x = (-2).dp, y = (-2).dp)
+                            .clip(CircleShape)
+                            .background(if (isDarkTheme) Color(0xFF1A1A1A) else Color.White)
+                            .padding(2.dp)
+                            .clip(CircleShape)
+                            .background(Color(0xFF4CAF50))
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.width(12.dp))
+            
+            // Name and last message
+            Column(modifier = Modifier.weight(1f)) {
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = displayName,
+                        fontWeight = FontWeight.SemiBold,
+                        fontSize = 16.sp,
+                        color = textColor,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.weight(1f)
+                    )
+                    
+                    Text(
+                        text = formatTime(Date(dialog.lastMessageTimestamp)),
+                        fontSize = 13.sp,
+                        color = if (dialog.unreadCount > 0) PrimaryBlue else secondaryTextColor
+                    )
+                }
+                
+                Spacer(modifier = Modifier.height(4.dp))
+                
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = dialog.lastMessage.ifEmpty { "No messages" },
+                        fontSize = 14.sp,
+                        color = secondaryTextColor,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.weight(1f)
+                    )
+                    
+                    // Unread badge
+                    if (dialog.unreadCount > 0) {
+                        Spacer(modifier = Modifier.width(8.dp))
+                        Box(
+                            modifier = Modifier
+                                .size(22.dp)
+                                .clip(CircleShape)
+                                .background(PrimaryBlue),
+                            contentAlignment = Alignment.Center
+                        ) {
+                            Text(
+                                text = if (dialog.unreadCount > 99) "99+" else dialog.unreadCount.toString(),
+                                fontSize = 12.sp,
+                                fontWeight = FontWeight.SemiBold,
+                                color = Color.White
+                            )
+                        }
+                    }
+                }
+            }
+        }
+        
+        Divider(
+            modifier = Modifier.padding(start = 84.dp),
+            color = dividerColor,
+            thickness = 0.5.dp
+        )
+    }
+}

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

@@ -0,0 +1,97 @@
+package com.rosetta.messenger.ui.chats
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.rosetta.messenger.database.DialogEntity
+import com.rosetta.messenger.database.RosettaDatabase
+import com.rosetta.messenger.network.ProtocolManager
+import com.rosetta.messenger.network.SearchUser
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.launch
+
+/**
+ * ViewModel для списка чатов
+ * Загружает диалоги из базы данных
+ */
+class ChatsListViewModel(application: Application) : AndroidViewModel(application) {
+    
+    private val database = RosettaDatabase.getDatabase(application)
+    private val dialogDao = database.dialogDao()
+    
+    private var currentAccount: String = ""
+    
+    // Список диалогов из базы
+    private val _dialogs = MutableStateFlow<List<DialogEntity>>(emptyList())
+    val dialogs: StateFlow<List<DialogEntity>> = _dialogs.asStateFlow()
+    
+    // Загрузка
+    private val _isLoading = MutableStateFlow(false)
+    val isLoading: StateFlow<Boolean> = _isLoading.asStateFlow()
+    
+    /**
+     * Установить текущий аккаунт и загрузить диалоги
+     */
+    fun setAccount(publicKey: String) {
+        if (currentAccount == publicKey) return
+        currentAccount = publicKey
+        
+        viewModelScope.launch {
+            dialogDao.getDialogsFlow(publicKey)
+                .collect { dialogsList ->
+                    _dialogs.value = dialogsList
+                    ProtocolManager.addLog("📋 Dialogs loaded: ${dialogsList.size}")
+                }
+        }
+    }
+    
+    /**
+     * Создать или обновить диалог после отправки/получения сообщения
+     */
+    suspend fun upsertDialog(
+        opponentKey: String,
+        opponentTitle: String,
+        opponentUsername: String = "",
+        lastMessage: String,
+        timestamp: Long,
+        verified: Int = 0,
+        isOnline: Int = 0
+    ) {
+        if (currentAccount.isEmpty()) return
+        
+        val existingDialog = dialogDao.getDialog(currentAccount, opponentKey)
+        
+        if (existingDialog != null) {
+            // Обновляем
+            dialogDao.updateLastMessage(currentAccount, opponentKey, lastMessage, timestamp)
+            if (opponentTitle.isNotEmpty()) {
+                dialogDao.updateOpponentInfo(currentAccount, opponentKey, opponentTitle, opponentUsername, verified)
+            }
+        } else {
+            // Создаём новый
+            dialogDao.insertDialog(DialogEntity(
+                account = currentAccount,
+                opponentKey = opponentKey,
+                opponentTitle = opponentTitle,
+                opponentUsername = opponentUsername,
+                lastMessage = lastMessage,
+                lastMessageTimestamp = timestamp,
+                verified = verified,
+                isOnline = isOnline
+            ))
+        }
+    }
+    
+    /**
+     * Конвертировать DialogEntity в SearchUser для навигации
+     */
+    fun dialogToSearchUser(dialog: DialogEntity): SearchUser {
+        return SearchUser(
+            title = dialog.opponentTitle,
+            username = dialog.opponentUsername,
+            publicKey = dialog.opponentKey,
+            verified = dialog.verified,
+            online = dialog.isOnline
+        )
+    }
+}