Render formatted text in the ChatScreen

uniffi automatically converts to camelCase for Kotlin,
but it won't convert to snake_case for Rust.

.idea/codeStyles/Project.xml

@@ -1,6 +1,7 @@
 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
     <JetCodeStyleSettings>
+      <option name="ALLOW_TRAILING_COMMA" value="true" />
       <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
     </JetCodeStyleSettings>
     <codeStyleSettings language="XML">

app/build.gradle

@@ -10,7 +10,7 @@ android {
 
     defaultConfig {
         applicationId "dev.lonami.talaria"
-        minSdk 21
+        minSdk 26
         targetSdk 33
         versionCode 1
         versionName "0.1.0"
@@ -57,6 +57,7 @@ dependencies {
     implementation "androidx.compose.ui:ui-tooling-preview:$compose_ui_version"
     implementation 'androidx.compose.material:material:1.2.1'
     implementation "androidx.navigation:navigation-compose:2.5.2"
+    implementation "net.java.dev.jna:jna:5.12.0@aar"
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
@@ -68,8 +69,8 @@ dependencies {
 // See https://github.com/mozilla/rust-android-gradle for other targets and required toolchains
 cargo {
     module = "../native"
-    libname = "talaria"
-    targets = ["arm64", "arm", "x86"]
+    libname = "uniffi_talaria"
+    targets = ["arm64"]
     profile = 'release'
 }
 
@@ -78,3 +79,14 @@ tasks.whenTaskAdded { task ->
         task.dependsOn 'cargoBuild'
     }
 }
+
+// See https://mozilla.github.io/uniffi-rs/kotlin/gradle.html for more details on this snippet
+android.applicationVariants.all { variant ->
+    def t = tasks.register("generate${variant.name.capitalize()}UniFFIBindings", Exec) {
+        workingDir "${project.projectDir}"
+        commandLine 'uniffi-bindgen', 'generate', '../native/src/talaria.udl', '--language', 'kotlin', '--no-format', '--out-dir', "${buildDir}/generated/source/uniffi/${variant.name}/java"
+    }
+    variant.javaCompileProvider.get().dependsOn(t)
+    def sourceSet = variant.sourceSets.find { it.name == variant.name }
+    sourceSet.java.srcDir new File(buildDir, "generated/source/uniffi/${variant.name}/java")
+}

app/src/main/java/dev/lonami/talaria/MainActivity.kt

@@ -7,15 +7,15 @@ import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Surface
 import androidx.compose.ui.Modifier
-import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.ui.theme.TalariaTheme
+import uniffi.talaria.initClient
+import uniffi.talaria.initDatabase
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContent {
             TalariaTheme {
-                // A surface container using the 'background' color from the theme
                 Surface(
                     modifier = Modifier.fillMaxSize(),
                     color = MaterialTheme.colors.background
@@ -25,6 +25,7 @@ class MainActivity : ComponentActivity() {
             }
         }
 
-        Native.initClient()
+        initDatabase(getDatabasePath("talaria.db").path)
+        initClient()
     }
 }

app/src/main/java/dev/lonami/talaria/TalariaApp.kt

@@ -1,20 +1,29 @@
 package dev.lonami.talaria
 
 import androidx.annotation.StringRes
-import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
 import androidx.compose.material.*
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.currentBackStackEntryAsState
 import androidx.navigation.compose.rememberNavController
-import dev.lonami.talaria.ui.ChatScreen
-import dev.lonami.talaria.ui.DialogScreen
-import dev.lonami.talaria.ui.LoginScreen
+import dev.lonami.talaria.ui.screens.ChatScreen
+import dev.lonami.talaria.ui.screens.DialogScreen
+import dev.lonami.talaria.ui.screens.LoginScreen
+import dev.lonami.talaria.ui.state.ChatViewModel
+import kotlinx.coroutines.launch
+import uniffi.talaria.needLogin
 
 enum class TalariaScreen(@StringRes val title: Int) {
     Login(title = R.string.app_name),
@@ -22,9 +31,96 @@ enum class TalariaScreen(@StringRes val title: Int) {
     Chat(title = R.string.chat),
 }
 
+enum class DrawerAction {
+    SelectAccount,
+    AddAccount,
+    SavedMessages,
+    Contacts,
+    NewChat,
+    Settings,
+    Help,
+}
+
 @Composable
-fun TalariaAppBar(currentScreen: TalariaScreen, canNavigateBack: Boolean, navigateUp: () -> Unit) {
+fun DrawerAction(
+    icon: ImageVector,
+    text: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Row(
+        modifier = modifier
+            .clickable(onClick = onClick)
+            .fillMaxWidth()
+            .padding(0.dp, 8.dp)
+    ) {
+        Icon(imageVector = icon, contentDescription = null)
+        Spacer(modifier = Modifier.width(8.dp))
+        Text(text)
+    }
+}
+
+@Composable
+fun Drawer(onSelect: (DrawerAction) -> Unit, modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .padding(24.dp, 48.dp)
+    ) {
+        Image(
+            painter = painterResource(R.drawable.ic_launcher_foreground),
+            contentDescription = "App Icon"
+        )
+        DrawerAction(
+            icon = Icons.Filled.AccountBox,
+            text = "Main Account",
+            onClick = { onSelect(DrawerAction.SelectAccount) }
+        )
+        DrawerAction(
+            icon = Icons.Filled.Add,
+            text = "Add Account",
+            onClick = { onSelect(DrawerAction.AddAccount) }
+        )
+        Divider()
+        DrawerAction(
+            icon = Icons.Filled.Star,
+            text = "Saved Messages",
+            onClick = { onSelect(DrawerAction.SavedMessages) }
+        )
+        DrawerAction(
+            icon = Icons.Filled.Call,
+            text = "Contacts",
+            onClick = { onSelect(DrawerAction.Contacts) }
+        )
+        DrawerAction(
+            icon = Icons.Filled.Create,
+            text = "New Chat",
+            onClick = { onSelect(DrawerAction.NewChat) }
+        )
+        Divider()
+        DrawerAction(
+            icon = Icons.Filled.Settings,
+            text = "Settings",
+            onClick = { onSelect(DrawerAction.Settings) }
+        )
+        DrawerAction(
+            icon = Icons.Filled.Info,
+            text = "Help",
+            onClick = { onSelect(DrawerAction.Help) }
+        )
+    }
+}
+
+@Composable
+fun TalariaAppBar(
+    currentScreen: TalariaScreen,
+    canNavigateBack: Boolean,
+    navigateUp: () -> Unit,
+    openDrawer: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
     TopAppBar(
+        modifier = modifier,
         title = { Text(stringResource(currentScreen.title)) },
         navigationIcon = {
             if (canNavigateBack) {
@@ -34,42 +130,78 @@ fun TalariaAppBar(currentScreen: TalariaScreen, canNavigateBack: Boolean, naviga
                         contentDescription = stringResource(R.string.back_button)
                     )
                 }
+            } else {
+                IconButton(onClick = openDrawer) {
+                    Icon(
+                        imageVector = Icons.Filled.Menu,
+                        contentDescription = stringResource(androidx.compose.ui.R.string.navigation_menu)
+                    )
+                }
             }
         }
     )
 }
 
 @Composable
-fun TalariaApp() {
+fun TalariaApp(modifier: Modifier = Modifier) {
     val navController = rememberNavController()
     val backStackEntry by navController.currentBackStackEntryAsState()
     val currentScreen =
         TalariaScreen.valueOf(backStackEntry?.destination?.route ?: TalariaScreen.Login.name)
 
+    val loggedIn by remember { mutableStateOf(!needLogin()) }
     var selectedDialog by remember { mutableStateOf("") }
 
+    val drawerState = rememberDrawerState(DrawerValue.Closed)
+    val scope = rememberCoroutineScope()
+    val toggleDrawer = { open: Boolean ->
+        scope.launch {
+            if (open) {
+                drawerState.open()
+            } else {
+                drawerState.close()
+            }
+        }
+    }
+
+    val chatViewModel = remember { ChatViewModel() }
+
     Scaffold(
+        modifier = modifier,
         topBar = {
             TalariaAppBar(
                 currentScreen,
                 canNavigateBack = navController.previousBackStackEntry != null,
-                navigateUp = { navController.navigateUp() }
+                navigateUp = { navController.navigateUp() },
+                openDrawer = { toggleDrawer(drawerState.isClosed) }
             )
         }
     ) { innerPadding ->
+        ModalDrawer(
+            drawerState = drawerState,
+            gesturesEnabled = drawerState.isOpen,
+            drawerContent = {
+                Drawer(onSelect = {})
+            }) {
+
             NavHost(
                 navController = navController,
-            startDestination = TalariaScreen.Login.name,
+                startDestination = if (loggedIn) {
+                    TalariaScreen.Login.name
+                } else {
+                    TalariaScreen.Dialog.name
+                },
                 Modifier.padding(innerPadding)
             ) {
                 composable(route = TalariaScreen.Dialog.name) {
                     DialogScreen(onDialogSelected = {
                         selectedDialog = it
+                        chatViewModel.loadMessages(it)
                         navController.navigate(TalariaScreen.Chat.name)
                     })
                 }
                 composable(route = TalariaScreen.Chat.name) {
-                ChatScreen(selectedDialog)
+                    ChatScreen(selectedDialog, chatViewModel = chatViewModel)
                 }
                 composable(route = TalariaScreen.Login.name) {
                     LoginScreen(onConfirmOtp = {
@@ -79,3 +211,23 @@ fun TalariaApp() {
             }
         }
     }
+}
+
+@Preview
+@Composable
+fun TopBarPreview() {
+    TalariaAppBar(
+        currentScreen = TalariaScreen.Dialog,
+        canNavigateBack = false,
+        navigateUp = {},
+        openDrawer = {},
+    )
+}
+
+@Preview
+@Composable
+fun NavDrawerPreview() {
+    Surface {
+        Drawer(onSelect = {})
+    }
+}

app/src/main/java/dev/lonami/talaria/bindings/Native.kt

@@ -1,18 +0,0 @@
-package dev.lonami.talaria.bindings
-
-object Native {
-    init {
-        System.loadLibrary("talaria")
-    }
-
-    external fun initClient()
-    external fun needLogin(): Boolean
-    external fun requestLoginCode(phone: String): Long
-    external fun signIn(tokenPtr: Long, code: String)
-    external fun getDialogs(): Long
-    external fun dialogCount(dialogsPtr: Long): Int
-    external fun dialogPacked(dialogsPtr: Long, index: Int): String
-    external fun dialogTitle(dialogsPtr: Long, index: Int): String
-    external fun freeDialogs(dialogsPtr: Long)
-    external fun sendMessage(packed: String, text: String)
-}

app/src/main/java/dev/lonami/talaria/data/DialogRepository.kt

@@ -0,0 +1,56 @@
+package dev.lonami.talaria.data
+
+import uniffi.talaria.Dialog
+import uniffi.talaria.MessageAck
+import uniffi.talaria.MessagePreview
+import uniffi.talaria.getDialogs
+import java.time.Instant
+
+interface DialogRepository {
+    fun loadDialogs(): List<Dialog>
+}
+
+class NativeDialogRepository : DialogRepository {
+    override fun loadDialogs(): List<Dialog> {
+        return getDialogs()
+    }
+}
+
+class MockDialogRepository : DialogRepository {
+    override fun loadDialogs(): List<Dialog> {
+        val dialogs = mutableListOf<Dialog>()
+        for (i in 0 until 10) {
+            dialogs.add(
+                Dialog(
+                    id = "$i",
+                    title = "Sample Dialog $i",
+                    lastMessage = if (i % 4 == 3) {
+                        null
+                    } else {
+                        MessagePreview(
+                            sender = if (i % 2 == 0) {
+                                "Sender A"
+                            } else {
+                                "Sender B"
+                            },
+                            text = if (i % 3 == 2) {
+                                "Very Long Sample Message $i, with a Lot of Text, which makes it hard to Preview"
+                            } else {
+                                "Sample Message $i"
+                            },
+                            date = Instant.now(),
+                            ack = when (i % 3) {
+                                0 -> MessageAck.RECEIVED
+                                1 -> MessageAck.SENT
+                                2 -> MessageAck.SEEN
+                                else -> throw RuntimeException()
+                            }
+                        )
+                    },
+                    pinned = i < 4
+                )
+            )
+        }
+        return dialogs
+    }
+}

app/src/main/java/dev/lonami/talaria/data/DialogSource.kt

@@ -1,25 +0,0 @@
-package dev.lonami.talaria.data
-
-import dev.lonami.talaria.bindings.Native
-import dev.lonami.talaria.model.Dialog
-
-object DialogSource {
-    fun loadDialogs(): List<Dialog> {
-        val dialogs = mutableListOf<Dialog>()
-
-        val dialogPtr = Native.getDialogs()
-        val dialogCount = Native.dialogCount(dialogPtr)
-        for (i in 0 until dialogCount) {
-            dialogs.add(
-                Dialog(
-                    Native.dialogTitle(dialogPtr, i),
-                    Native.dialogPacked(dialogPtr, i),
-                    false
-                )
-            )
-        }
-        Native.freeDialogs(dialogPtr)
-
-        return dialogs
-    }
-}

app/src/main/java/dev/lonami/talaria/data/MessageRepository.kt

@@ -0,0 +1,46 @@
+package dev.lonami.talaria.data
+
+import uniffi.talaria.Message
+import uniffi.talaria.getMessages
+import java.time.Instant
+
+interface MessageRepository {
+    fun loadMessages(chat: String): List<Message>
+    fun sendMessage(chat: String, message: String): Message
+}
+
+class NativeMessageRepository : MessageRepository {
+    override fun loadMessages(chat: String): List<Message> {
+        return getMessages(chat)
+    }
+
+    override fun sendMessage(chat: String, message: String): Message {
+        return uniffi.talaria.sendMessage(chat, message)
+    }
+}
+
+class MockMessageRepository(private var msgCounter: Int = 50) : MessageRepository {
+    override fun loadMessages(chat: String): List<Message> {
+        return (0 until 50).map {
+            Message(
+                id = it,
+                sender = "Alice",
+                text = "Testing",
+                date = Instant.now(),
+                editDate = null,
+                formatting = listOf(),
+            )
+        }.toList()
+    }
+
+    override fun sendMessage(chat: String, message: String): Message {
+        return Message(
+            id = msgCounter++,
+            sender = "You",
+            text = message,
+            date = Instant.now(),
+            editDate = null,
+            formatting = listOf(),
+        )
+    }
+}

app/src/main/java/dev/lonami/talaria/data/MessageSource.kt

@@ -1,11 +0,0 @@
-package dev.lonami.talaria.data
-
-import dev.lonami.talaria.model.Message
-
-object MessageSource {
-    fun loadMessages(): List<Message> {
-        return generateSequence {
-            Message("Alice", "Testing")
-        }.take(50).toList()
-    }
-}

app/src/main/java/dev/lonami/talaria/model/Dialog.kt

@@ -1,3 +0,0 @@
-package dev.lonami.talaria.model
-
-data class Dialog(val title: String, val lastMessage: String, val pinned: Boolean)

app/src/main/java/dev/lonami/talaria/model/Message.kt

@@ -1,3 +0,0 @@
-package dev.lonami.talaria.model
-
-data class Message(val sender: String, val text: String)

app/src/main/java/dev/lonami/talaria/ui/ChatScreen.kt

@@ -1,110 +0,0 @@
-package dev.lonami.talaria.ui
-
-import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.foundation.text.KeyboardActions
-import androidx.compose.foundation.text.KeyboardOptions
-import androidx.compose.material.Button
-import androidx.compose.material.Card
-import androidx.compose.material.Text
-import androidx.compose.material.TextField
-import androidx.compose.runtime.*
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.text.input.ImeAction
-import androidx.compose.ui.tooling.preview.Preview
-import androidx.compose.ui.unit.dp
-import androidx.lifecycle.viewmodel.compose.viewModel
-import dev.lonami.talaria.R
-import dev.lonami.talaria.model.Message
-import dev.lonami.talaria.ui.theme.TalariaTheme
-import kotlinx.coroutines.launch
-
-@Composable
-fun MessageCard(message: Message) {
-    Card(
-        elevation = 4.dp,
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(8.dp)
-    ) {
-        Column(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(8.dp)
-        ) {
-            Text(message.sender, fontWeight = FontWeight.Bold)
-            Text(message.text)
-        }
-    }
-}
-
-@Composable
-fun MessageList(messages: List<Message>, modifier: Modifier, listState: LazyListState) {
-    LazyColumn(modifier, state = listState) {
-        items(messages.size) { MessageCard(messages[it]) }
-    }
-}
-
-@Composable
-fun MessageInputField(
-    messageText: String,
-    onMessageChanged: (String) -> Unit,
-    onSendMessage: () -> Unit
-) {
-    Row {
-        TextField(
-            messageText,
-            placeholder = { Text(stringResource(R.string.write_message)) },
-            keyboardOptions = KeyboardOptions(
-                imeAction = ImeAction.Send
-            ),
-            keyboardActions = KeyboardActions(
-                onDone = { onSendMessage() }
-            ),
-            modifier = Modifier.weight(1.0f),
-            onValueChange = onMessageChanged
-        )
-        Button(
-            onClick = onSendMessage
-        ) {
-            Text(stringResource(R.string.send_message))
-        }
-    }
-}
-
-@Composable
-fun ChatScreen(selectedDialog: String, chatViewModel: ChatViewModel = viewModel()) {
-    val chatUiState by chatViewModel.uiState.collectAsState()
-    var messageText by remember { mutableStateOf("") }
-    val messageListState = rememberLazyListState()
-    val coroutineScope = rememberCoroutineScope()
-
-    Column(modifier = Modifier.fillMaxSize()) {
-        MessageList(
-            chatUiState.messages,
-            modifier = Modifier.weight(1.0f),
-            listState = messageListState
-        )
-        MessageInputField(messageText, onMessageChanged = {
-            messageText = it
-        }, onSendMessage = {
-            chatViewModel.sendMessage(selectedDialog, messageText)
-            messageText = ""
-            coroutineScope.launch {
-                messageListState.animateScrollToItem(chatUiState.messages.size - 1)
-            }
-        })
-    }
-}
-
-@Preview
-@Composable
-fun ChatPreview() {
-    TalariaTheme {
-        ChatScreen("")
-    }
-}

app/src/main/java/dev/lonami/talaria/ui/ChatViewModel.kt

@@ -1,31 +0,0 @@
-package dev.lonami.talaria.ui
-
-import androidx.lifecycle.ViewModel
-import dev.lonami.talaria.bindings.Native
-import dev.lonami.talaria.data.MessageSource
-import dev.lonami.talaria.model.Message
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.update
-
-class ChatViewModel : ViewModel() {
-    private val _uiState = MutableStateFlow(ChatUiState())
-    val uiState: StateFlow<ChatUiState> = _uiState.asStateFlow()
-
-    private fun loadMessages() {
-        _uiState.value = ChatUiState(MessageSource.loadMessages().toMutableList())
-    }
-
-    fun sendMessage(dialog: String, message: String) {
-        Native.sendMessage(dialog, message)
-        _uiState.update { state ->
-            state.messages.add(Message("You", message))
-            state
-        }
-    }
-
-    init {
-        loadMessages()
-    }
-}

app/src/main/java/dev/lonami/talaria/ui/DialogScreen.kt

@@ -1,75 +0,0 @@
-package dev.lonami.talaria.ui
-
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.clickable
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.Row
-import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.material.Card
-import androidx.compose.material.Switch
-import androidx.compose.material.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.collectAsState
-import androidx.compose.runtime.getValue
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.tooling.preview.Preview
-import androidx.compose.ui.unit.dp
-import androidx.lifecycle.viewmodel.compose.viewModel
-import dev.lonami.talaria.R
-import dev.lonami.talaria.model.Dialog
-import dev.lonami.talaria.ui.theme.TalariaTheme
-
-@Composable
-fun DialogCard(dialog: Dialog, onDialogSelected: () -> Unit) {
-    Card(
-        modifier = Modifier
-            .fillMaxWidth()
-            .padding(8.dp, 16.dp)
-            .clickable(onClick = onDialogSelected)
-    ) {
-        Row {
-            Image(
-                painter = painterResource(R.drawable.ic_launcher_foreground),
-                contentDescription = stringResource(R.string.profile_photo),
-            )
-            Column(modifier = Modifier.weight(1.0f)) {
-                Text(dialog.title, fontWeight = FontWeight.Bold)
-                Text(dialog.lastMessage)
-            }
-            Switch(dialog.pinned, enabled = false, onCheckedChange = null)
-        }
-    }
-}
-
-@Composable
-fun DialogList(dialogs: List<Dialog>, onDialogSelected: (String) -> Unit) {
-    LazyColumn {
-        items(dialogs.size) {
-            DialogCard(dialogs[it], onDialogSelected = {
-                onDialogSelected(dialogs[it].lastMessage)
-            })
-        }
-    }
-}
-
-@Composable
-fun DialogScreen(
-    onDialogSelected: (String) -> Unit,
-    dialogViewModel: DialogViewModel = viewModel()
-) {
-    val dialogUiState by dialogViewModel.uiState.collectAsState()
-    DialogList(dialogUiState.dialogs, onDialogSelected = onDialogSelected)
-}
-
-@Preview
-@Composable
-fun DialogPreview() {
-    TalariaTheme {
-        DialogScreen(onDialogSelected = { })
-    }
-}

app/src/main/java/dev/lonami/talaria/ui/DialogUiState.kt

@@ -1,5 +0,0 @@
-package dev.lonami.talaria.ui
-
-import dev.lonami.talaria.model.Dialog
-
-data class DialogUiState(val dialogs: List<Dialog> = listOf())

app/src/main/java/dev/lonami/talaria/ui/screens/ChatScreen.kt

@@ -0,0 +1,181 @@
+package dev.lonami.talaria.ui.screens
+
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.text.ClickableText
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.Button
+import androidx.compose.material.Card
+import androidx.compose.material.Text
+import androidx.compose.material.TextField
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.AnnotatedString
+import androidx.compose.ui.text.SpanStyle
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import dev.lonami.talaria.R
+import dev.lonami.talaria.data.MockMessageRepository
+import dev.lonami.talaria.ui.state.ChatViewModel
+import dev.lonami.talaria.ui.theme.TalariaTheme
+import kotlinx.coroutines.launch
+import uniffi.talaria.Formatting
+import uniffi.talaria.Message
+import uniffi.talaria.TextFormat
+
+@Composable
+fun FormattedText(
+    text: String,
+    formatting: List<TextFormat>,
+    onFormatClicked: (TextFormat) -> Unit,
+) {
+    val anno = AnnotatedString(text, spanStyles = formatting.map {
+        AnnotatedString.Range(SpanStyle(
+            fontWeight = when (it.format) {
+                Formatting.BOLD -> FontWeight.Bold
+                else -> FontWeight.Normal
+            },
+            fontStyle = when (it.format) {
+                Formatting.ITALIC -> FontStyle.Italic
+                else -> FontStyle.Normal
+            },
+            fontFamily = when (it.format) {
+                Formatting.CODE,
+                Formatting.PRE,
+                -> FontFamily.Monospace
+                else -> FontFamily.Default
+            },
+            textDecoration = when (it.format) {
+                Formatting.UNDERLINE -> TextDecoration.Underline
+                Formatting.STRIKE -> TextDecoration.LineThrough
+                else -> TextDecoration.None
+            },
+            color = when (it.format) {
+                Formatting.MENTION,
+                Formatting.HASH_TAG,
+                Formatting.BOT_COMMAND,
+                Formatting.URL,
+                Formatting.EMAIL,
+                Formatting.TEXT_URL,
+                Formatting.MENTION_NAME,
+                Formatting.PHONE,
+                Formatting.CASH_TAG,
+                -> Color(0xff0000ff)
+                else -> Color.Black
+            }), it.offset, it.offset + it.length)
+    })
+    ClickableText(
+        anno,
+        onClick = { offset ->
+            anno.spanStyles.indexOfFirst {
+                it.start <= offset && offset <= it.end
+            }.takeIf { it != -1 }?.also {
+                onFormatClicked(formatting[it])
+            }
+        }
+    )
+}
+
+@Composable
+fun MessageCard(message: Message, modifier: Modifier = Modifier) {
+    Card(
+        elevation = 4.dp,
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(8.dp)
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(8.dp)
+        ) {
+            Text(message.sender, fontWeight = FontWeight.Bold)
+            FormattedText(message.text, message.formatting, onFormatClicked = {})
+        }
+    }
+}
+
+@Composable
+fun MessageList(messages: List<Message>, listState: LazyListState, modifier: Modifier = Modifier) {
+    LazyColumn(modifier = modifier, state = listState) {
+        items(messages.size) { MessageCard(messages[it]) }
+    }
+}
+
+@Composable
+fun MessageInputField(
+    messageText: String,
+    onMessageChanged: (String) -> Unit,
+    onSendMessage: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Row(modifier = modifier) {
+        TextField(
+            messageText,
+            placeholder = { Text(stringResource(R.string.write_message)) },
+            keyboardOptions = KeyboardOptions(
+                imeAction = ImeAction.Send
+            ),
+            keyboardActions = KeyboardActions(
+                onDone = { onSendMessage() }
+            ),
+            modifier = Modifier.weight(1.0f),
+            onValueChange = onMessageChanged
+        )
+        Button(
+            onClick = onSendMessage
+        ) {
+            Text(stringResource(R.string.send_message))
+        }
+    }
+}
+
+@Composable
+fun ChatScreen(
+    selectedDialog: String,
+    modifier: Modifier = Modifier,
+    chatViewModel: ChatViewModel = viewModel(),
+) {
+    val chatUiState by chatViewModel.uiState.collectAsState()
+    var messageText by remember { mutableStateOf("") }
+    val messageListState = rememberLazyListState()
+    val coroutineScope = rememberCoroutineScope()
+
+    Column(modifier = modifier.fillMaxSize()) {
+        MessageList(
+            chatUiState.messages,
+            modifier = Modifier.weight(1.0f),
+            listState = messageListState
+        )
+        MessageInputField(messageText, onMessageChanged = {
+            messageText = it
+        }, onSendMessage = {
+            chatViewModel.sendMessage(selectedDialog, messageText)
+            messageText = ""
+            coroutineScope.launch {
+                messageListState.animateScrollToItem(chatUiState.messages.size - 1)
+            }
+        })
+    }
+}
+
+@Preview
+@Composable
+fun ChatPreview() {
+    val viewModel = remember { ChatViewModel(MockMessageRepository()).apply { loadMessages("") } }
+
+    TalariaTheme {
+        ChatScreen("", chatViewModel = viewModel)
+    }
+}

app/src/main/java/dev/lonami/talaria/ui/screens/DialogScreen.kt

@@ -0,0 +1,137 @@
+package dev.lonami.talaria.ui.screens
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material.Divider
+import androidx.compose.material.Icon
+import androidx.compose.material.Surface
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import dev.lonami.talaria.R
+import dev.lonami.talaria.data.MockDialogRepository
+import dev.lonami.talaria.ui.state.DialogViewModel
+import dev.lonami.talaria.ui.theme.TalariaTheme
+import uniffi.talaria.Dialog
+import uniffi.talaria.MessageAck
+import java.time.LocalDateTime
+import java.time.ZoneOffset
+import java.time.format.DateTimeFormatter
+import java.time.format.FormatStyle
+
+@Composable
+fun Dialog(dialog: Dialog, onDialogSelected: () -> Unit, modifier: Modifier = Modifier) {
+    Row(
+        modifier = modifier
+            .padding(4.dp)
+            .clickable(onClick = onDialogSelected)
+    ) {
+        Image(
+            painter = painterResource(R.drawable.ic_launcher_foreground),
+            contentDescription = stringResource(R.string.profile_photo),
+            contentScale = ContentScale.Fit,
+            modifier = Modifier.height(48.dp),
+        )
+        Column(modifier = Modifier.weight(1.0f)) {
+            Text(
+                dialog.title,
+                fontWeight = FontWeight.SemiBold,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis
+            )
+            if (dialog.lastMessage != null) {
+                Text(
+                    stringResource(
+                        R.string.message_preview,
+                        dialog.lastMessage!!.sender,
+                        dialog.lastMessage!!.text
+                    ),
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+        Column {
+            if (dialog.lastMessage != null) {
+                Row {
+                    when (dialog.lastMessage!!.ack) {
+                        MessageAck.RECEIVED -> {}
+                        MessageAck.SENT -> Icon(
+                            painterResource(R.drawable.sent),
+                            stringResource(R.string.sent)
+                        )
+                        MessageAck.SEEN -> Icon(
+                            painterResource(R.drawable.seen),
+                            stringResource(R.string.seen)
+                        )
+                    }
+                    Spacer(Modifier.width(8.dp))
+                    Text(
+                        LocalDateTime.ofInstant(dialog.lastMessage!!.date, ZoneOffset.UTC).format(
+                            DateTimeFormatter.ofLocalizedTime(
+                                FormatStyle.SHORT
+                            )
+                        ),
+                    )
+                }
+            }
+            if (dialog.pinned) {
+                Icon(
+                    painterResource(R.drawable.tack),
+                    stringResource(R.string.pinned),
+                    modifier = Modifier.align(Alignment.End)
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun DialogList(
+    dialogs: List<Dialog>,
+    onDialogSelected: (String) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    LazyColumn(modifier = modifier) {
+        items(dialogs.size) {
+            Dialog(dialogs[it], onDialogSelected = {
+                onDialogSelected(dialogs[it].id)
+            })
+            Divider(startIndent = 52.dp)
+        }
+    }
+}
+
+@Composable
+fun DialogScreen(
+    onDialogSelected: (String) -> Unit,
+    modifier: Modifier = Modifier,
+    dialogViewModel: DialogViewModel = viewModel(),
+) {
+    val dialogUiState by dialogViewModel.uiState.collectAsState()
+    Surface(modifier = modifier) {
+        DialogList(dialogUiState.dialogs, onDialogSelected = onDialogSelected)
+    }
+}
+
+@Preview
+@Composable
+fun DialogPreview() {
+    val viewModel = DialogViewModel(MockDialogRepository())
+    TalariaTheme {
+        DialogScreen(onDialogSelected = { }, dialogViewModel = viewModel)
+    }
+}

app/src/main/java/dev/lonami/talaria/ui/screens/LoginScreen.kt

@@ -1,4 +1,4 @@
-package dev.lonami.talaria.ui
+package dev.lonami.talaria.ui.screens
 
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.text.KeyboardActions
@@ -18,8 +18,8 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import dev.lonami.talaria.R
-import dev.lonami.talaria.bindings.Native
 import dev.lonami.talaria.ui.theme.TalariaTheme
+import uniffi.talaria.LoginProcedure
 
 enum class LoginStage {
     ASK_PHONE,
@@ -30,9 +30,15 @@ fun isPhoneValid(phone: String): Boolean = phone.trim('+', ' ').isNotEmpty()
 fun isLoginCodeValid(code: String): Boolean = code.trim().count { it.isDigit() } == 5
 
 @Composable
-fun PhoneInput(phone: String, onPhoneChanged: (String) -> Unit, onSendCode: () -> Unit) {
+fun PhoneInput(
+    phone: String,
+    onPhoneChanged: (String) -> Unit,
+    onSendCode: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
     val focusManager = LocalFocusManager.current
 
+    Column(modifier = modifier) {
         Text(stringResource(R.string.enter_phone))
         TextField(
             phone,
@@ -56,11 +62,18 @@ fun PhoneInput(phone: String, onPhoneChanged: (String) -> Unit, onSendCode: () -
             Text(stringResource(R.string.send_otp))
         }
     }
+}
 
 @Composable
-fun OtpInput(otp: String, onOtpChanged: (String) -> Unit, onConfirmOtp: () -> Unit) {
+fun OtpInput(
+    otp: String,
+    onOtpChanged: (String) -> Unit,
+    onConfirmOtp: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
     val focusManager = LocalFocusManager.current
 
+    Column(modifier = modifier) {
         Text(stringResource(R.string.enter_otp))
         TextField(
             otp,
@@ -84,17 +97,18 @@ fun OtpInput(otp: String, onOtpChanged: (String) -> Unit, onConfirmOtp: () -> Un
             Text(stringResource(R.string.do_login))
         }
     }
+}
 
 @Composable
-fun LoginScreen(onConfirmOtp: () -> Unit) {
+fun LoginScreen(onConfirmOtp: () -> Unit, modifier: Modifier = Modifier) {
     var stage by remember { mutableStateOf(LoginStage.ASK_PHONE) }
     var phone by remember { mutableStateOf("") }
     var otp by remember { mutableStateOf("") }
 
-    var tokenPtr by remember { mutableStateOf(0L) }
+    val loginProcedure by remember { mutableStateOf(LoginProcedure()) }
 
     Column(
-        modifier = Modifier
+        modifier = modifier
             .fillMaxSize()
             .padding(16.dp),
         verticalArrangement = Arrangement.Center
@@ -113,7 +127,7 @@ fun LoginScreen(onConfirmOtp: () -> Unit) {
                 phone,
                 onPhoneChanged = { phone = it },
                 onSendCode = {
-                    tokenPtr = Native.requestLoginCode(phone)
+                    loginProcedure.requestLoginCode(phone)
                     stage = LoginStage.ASK_CODE
                 }
             )
@@ -121,7 +135,7 @@ fun LoginScreen(onConfirmOtp: () -> Unit) {
                 otp,
                 onOtpChanged = { otp = it },
                 onConfirmOtp = {
-                    Native.signIn(tokenPtr, otp)
+                    loginProcedure.signIn(otp)
                     onConfirmOtp()
                 }
             )

app/src/main/java/dev/lonami/talaria/ui/state/ChatUiState.kt

@@ -1,5 +1,5 @@
-package dev.lonami.talaria.ui
+package dev.lonami.talaria.ui.state
 
-import dev.lonami.talaria.model.Message
+import uniffi.talaria.Message
 
 data class ChatUiState(val messages: MutableList<Message> = mutableListOf())

app/src/main/java/dev/lonami/talaria/ui/state/ChatViewModel.kt

@@ -0,0 +1,31 @@
+package dev.lonami.talaria.ui.state
+
+import androidx.lifecycle.ViewModel
+import dev.lonami.talaria.data.MessageRepository
+import dev.lonami.talaria.data.NativeMessageRepository
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+
+class ChatViewModel(private val repository: MessageRepository = NativeMessageRepository()) :
+    ViewModel() {
+    private val _uiState = MutableStateFlow(ChatUiState())
+    val uiState: StateFlow<ChatUiState> = _uiState.asStateFlow()
+
+    fun loadMessages(chat: String) {
+        _uiState.update {
+            it.messages.clear()
+            it.messages.addAll(repository.loadMessages(chat))
+            it
+        }
+    }
+
+    fun sendMessage(dialog: String, message: String) {
+        val sent = repository.sendMessage(dialog, message)
+        _uiState.update {
+            it.messages.add(sent)
+            it
+        }
+    }
+}

app/src/main/java/dev/lonami/talaria/ui/state/DialogUiState.kt

@@ -0,0 +1,5 @@
+package dev.lonami.talaria.ui.state
+
+import uniffi.talaria.Dialog
+
+data class DialogUiState(val dialogs: List<Dialog> = listOf())

app/src/main/java/dev/lonami/talaria/ui/state/DialogViewModel.kt

@@ -1,17 +1,19 @@
-package dev.lonami.talaria.ui
+package dev.lonami.talaria.ui.state
 
 import androidx.lifecycle.ViewModel
-import dev.lonami.talaria.data.DialogSource
+import dev.lonami.talaria.data.DialogRepository
+import dev.lonami.talaria.data.NativeDialogRepository
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 
-class DialogViewModel : ViewModel() {
+class DialogViewModel(private val repository: DialogRepository = NativeDialogRepository()) :
+    ViewModel() {
     private val _uiState = MutableStateFlow(DialogUiState())
     val uiState: StateFlow<DialogUiState> = _uiState.asStateFlow()
 
     private fun loadDialogs() {
-        _uiState.value = DialogUiState(DialogSource.loadDialogs())
+        _uiState.value = DialogUiState(repository.loadDialogs())
     }
 
     init {

app/src/main/java/dev/lonami/talaria/ui/theme/Theme.kt

@@ -16,15 +16,6 @@ private val LightColorPalette = lightColors(
     primary = Purple500,
     primaryVariant = Purple700,
     secondary = Teal200
-
-        /* Other default colors to override
-    background = Color.White,
-    surface = Color.White,
-    onPrimary = Color.White,
-    onSecondary = Color.Black,
-    onBackground = Color.Black,
-    onSurface = Color.Black,
-    */
 )
 
 @Composable

app/src/main/java/dev/lonami/talaria/ui/theme/Type.kt

@@ -6,23 +6,10 @@ import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.sp
 
-// Set of Material typography styles to start with
 val Typography = Typography(
     body1 = TextStyle(
         fontFamily = FontFamily.Default,
         fontWeight = FontWeight.Normal,
         fontSize = 16.sp
     )
-        /* Other default text styles to override
-    button = TextStyle(
-        fontFamily = FontFamily.Default,
-        fontWeight = FontWeight.W500,
-        fontSize = 14.sp
-    ),
-    caption = TextStyle(
-        fontFamily = FontFamily.Default,
-        fontWeight = FontWeight.Normal,
-        fontSize = 12.sp
-    )
-    */
 )

app/src/main/res/drawable/seen.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:pathData="m11,16 l2,2 9,-9C23,8 22,7 21,8l-8,8 -1,-1z"
+        android:fillColor="@color/black" />
+    <path
+        android:pathData="m3,14 l4,4 9,-9C17,8 16,7 15,8L7,16 4,13C3,12 2,13 3,14Z"
+        android:fillColor="@color/black" />
+</vector>

app/src/main/res/drawable/sent.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:pathData="m6,14 l4,4 9,-9C20,8 19,7 18,8L10,16 7,13C6,12 5,13 6,14Z"
+        android:fillColor="@color/black" />
+</vector>

app/src/main/res/drawable/tack.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:pathData="m14,4 l-5,5 -6,1 5,5 -5,7 7,-5 5,5 1,-6 5,-5c1,-1 1,-1 0,-2L16,4C15,3 15,3 14,4Z"
+        android:fillColor="@color/black" />
+</vector>

app/src/main/res/values/strings.xml

@@ -15,4 +15,8 @@
     <string name="back_button">Back</string>
     <string name="dialog">All chats</string>
     <string name="chat">Messages</string>
+    <string name="pinned">Pinned</string>
+    <string name="sent">Sent</string>
+    <string name="seen">Seen</string>
+    <string name="message_preview"><em>%s</em>: %s</string>
 </resources>

build.gradle

@@ -4,8 +4,10 @@ buildscript {
     }
 }// Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.application' version '7.3.0' apply false
-    id 'com.android.library' version '7.3.0' apply false
+    // uniffi-recommended Gradle script fails with Android plugin 7.3.1.
+    // See https://github.com/mozilla/uniffi-rs/issues/1386 for details.
+    id 'com.android.application' version '7.2.2' apply false
+    id 'com.android.library' version '7.2.2' apply false
     id 'org.jetbrains.kotlin.android' version '1.6.10' apply false
     id "org.mozilla.rust-android-gradle.rust-android" version "0.9.3"
 }

native/Cargo.toml

@@ -4,19 +4,24 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
-name = "talaria"
+name = "uniffi_talaria"
 crate-type = ["cdylib"]
 
 [dependencies]
 jni = { version = "0.10.2", default-features = false }
+uniffi = "0.21.0"
 # v0.4 of grammers-* is currently unreleased; clone the project and use path dependencies
-grammers-client = { version = "0.4.0" }
+grammers-client = { version = "0.4.1" }
 grammers-tl-types = { version = "0.4.0" }
-grammers-session = { version = "0.4.0" }
+grammers-session = { version = "0.4.1" }
 tokio = { version = "1.5.0", features = ["full"] }
 log = "0.4.14"
 android_logger = "0.11.1"
 once_cell = "1.15.0"
+sqlite = "0.27.0"
+
+[build-dependencies]
+uniffi_build = "0.21.0"
 
 [profile.release]
 lto = true

native/build.rs

@@ -0,0 +1,3 @@
+fn main() {
+    uniffi_build::generate_scaffolding("src/talaria.udl").unwrap();
+}

native/src/db/mod.rs

@@ -0,0 +1,172 @@
+mod model;
+mod utils;
+
+use model::Session;
+use sqlite::{Connection, Error, State};
+use std::net::IpAddr;
+use utils::{fetch_many, fetch_one};
+
+fn init_schema(conn: &Connection) -> Result<(), Error> {
+    let version = match fetch_one(&conn, "SELECT version FROM version LIMIT 1", |stmt| {
+        stmt.read::<i64>(0)
+    }) {
+        Ok(Some(version)) => version,
+        _ => 0,
+    };
+
+    if version == 0 {
+        conn.execute(
+            "
+            BEGIN TRANSACTION;
+            CREATE TABLE version (version INTEGER NOT NULL);
+            CREATE TABLE session (
+                user_id INTEGER,
+                dc_id INTEGER,
+                bot INTEGER,
+                pts INTEGER,
+                qts INTEGER,
+                seq INTEGER,
+                date INTEGER
+            );
+            CREATE TABLE channel (
+                session_id INTEGER NOT NULL REFERENCES session (rowid),
+                id INTEGER NOT NULL,
+                hash INTEGER NOT NULL,
+                pts INTEGER NOT NULL
+            );
+            CREATE TABLE datacenter (
+                session_id INTEGER NOT NULL REFERENCES session (rowid),
+                id INTEGER NOT NULL,
+                ipv4 TEXT,
+                ipv6 TEXT,
+                port INTEGER NOT NULL,
+                auth BLOB,
+                CONSTRAINT SingleIp CHECK(
+                    (ipv4 IS NOT NULL AND ipv6 IS NULL) OR
+                    (ipv6 IS NOT NULL AND ipv4 IS NULL))
+            );
+            INSERT INTO version VALUES (1);
+            COMMIT;
+            ",
+        )?;
+    }
+
+    Ok(())
+}
+
+pub fn init_connection(db_path: &str) -> Result<Connection, Error> {
+    let conn = sqlite::open(db_path)?;
+    init_schema(&conn)?;
+    Ok(conn)
+}
+
+pub fn get_sessions(conn: &Connection) -> Result<Vec<Session>, Error> {
+    let query = "
+        SELECT s.rowid, s.*, COALESCE(d.ipv4, d.ipv6), d.port, d.auth
+        FROM session s
+        LEFT JOIN datacenter d ON d.session_id = s.rowid AND d.id = s.dc_id
+    ";
+    fetch_many(conn, query, |stmt| {
+        Ok(Session {
+            id: stmt.read(0)?,
+            user_id: stmt.read(1)?,
+            dc_id: stmt.read::<Option<i64>>(2)?.map(|x| x as _),
+            bot: stmt.read::<Option<i64>>(3)?.map(|x| x != 0),
+            pts: stmt.read::<Option<i64>>(4)?.map(|x| x as _),
+            qts: stmt.read::<Option<i64>>(5)?.map(|x| x as _),
+            seq: stmt.read::<Option<i64>>(6)?.map(|x| x as _),
+            date: stmt.read::<Option<i64>>(7)?.map(|x| x as _),
+            dc_addr: stmt.read::<Option<String>>(8)?,
+            dc_port: stmt.read::<Option<i64>>(9)?.map(|x| x as _),
+            dc_auth: stmt
+                .read::<Option<Vec<u8>>>(10)?
+                .map(|x| x.try_into().unwrap()),
+        })
+    })
+}
+
+pub fn create_session(conn: &Connection) -> Result<Session, Error> {
+    conn.execute("INSERT INTO session DEFAULT VALUES;")?;
+    let id = fetch_one(conn, "SELECT LAST_INSERT_ROWID()", |stmt| {
+        stmt.read::<i64>(0)
+    })?
+    .unwrap();
+    Ok(Session {
+        id,
+        user_id: None,
+        dc_id: None,
+        bot: None,
+        pts: None,
+        qts: None,
+        seq: None,
+        date: None,
+        dc_addr: None,
+        dc_port: None,
+        dc_auth: None,
+    })
+}
+
+pub fn update_session(conn: &Connection, session: &Session) -> Result<(), Error> {
+    let mut stmt = conn
+        .prepare(
+            "
+            UPDATE session SET
+                user_id = ?,
+                dc_id = ?,
+                bot = ?,
+                pts = ?,
+                qts = ?,
+                seq = ?,
+                date = ?
+            WHERE rowid = ?
+            ",
+        )?
+        .bind(1, session.user_id)?
+        .bind(2, session.dc_id.map(|x| x as i64))?
+        .bind(3, session.bot.map(|x| x as i64))?
+        .bind(4, session.pts.map(|x| x as i64))?
+        .bind(5, session.qts.map(|x| x as i64))?
+        .bind(6, session.seq.map(|x| x as i64))?
+        .bind(7, session.date.map(|x| x as i64))?
+        .bind(8, session.id)?;
+    while let State::Row = stmt.next()? {}
+
+    match (
+        session.dc_id,
+        session.dc_addr.as_ref(),
+        session.dc_port,
+        session.dc_auth,
+    ) {
+        (Some(id), Some(addr), Some(port), Some(auth)) => {
+            let (ipv4, ipv6) = match addr.parse().unwrap() {
+                IpAddr::V4(ipv4) => (Some(ipv4.to_string()), None),
+                IpAddr::V6(ipv6) => (None, Some(ipv6.to_string())),
+            };
+
+            let mut stmt = conn
+                .prepare(
+                    "
+                    DELETE FROM datacenter WHERE session_id = ? AND id = ?
+                    ",
+                )?
+                .bind(1, session.id)?
+                .bind(2, id as i64)?;
+
+            while let State::Row = stmt.next()? {}
+
+            let mut stmt = conn
+                .prepare("INSERT INTO datacenter VALUES (?, ?, ?, ?, ?, ?)")?
+                .bind(1, session.id)?
+                .bind(2, id as i64)?
+                .bind(3, ipv4.as_deref())?
+                .bind(4, ipv6.as_deref())?
+                .bind(5, port as i64)?
+                .bind(6, auth.as_ref())?;
+
+            while let State::Row = stmt.next()? {}
+        }
+        _ => {}
+    }
+
+    Ok(())
+}

native/src/db/model.rs

@@ -0,0 +1,14 @@
+#[derive(Debug)]
+pub struct Session {
+    pub id: i64,
+    pub user_id: Option<i64>,
+    pub dc_id: Option<i32>,
+    pub bot: Option<bool>,
+    pub pts: Option<i32>,
+    pub qts: Option<i32>,
+    pub seq: Option<i32>,
+    pub date: Option<i32>,
+    pub dc_addr: Option<String>,
+    pub dc_port: Option<u16>,
+    pub dc_auth: Option<[u8; 256]>,
+}

native/src/db/utils.rs

@@ -0,0 +1,27 @@
+use sqlite::{Connection, Error, State, Statement};
+
+pub fn fetch_one<T, F: FnOnce(&Statement) -> Result<T, Error>>(
+    conn: &Connection,
+    query: &str,
+    adaptor: F,
+) -> Result<Option<T>, Error> {
+    let mut stmt = conn.prepare(query)?;
+    if let State::Row = stmt.next()? {
+        adaptor(&stmt).map(Some)
+    } else {
+        Ok(None)
+    }
+}
+
+pub fn fetch_many<T, F: FnMut(&Statement) -> Result<T, Error>>(
+    conn: &Connection,
+    query: &str,
+    mut adaptor: F,
+) -> Result<Vec<T>, Error> {
+    let mut result = Vec::new();
+    let mut stmt = conn.prepare(query)?;
+    while let State::Row = stmt.next()? {
+        result.push(adaptor(&stmt)?);
+    }
+    Ok(result)
+}

native/src/lib.rs

@@ -1,30 +1,139 @@
 #![cfg(target_os = "android")]
 #![allow(non_snake_case)]
 
-use std::ffi::{CStr, CString};
-use std::future::Future;
+mod db;
 
-use grammers_client::{Client, Config};
-use grammers_client::types::{Dialog, LoginToken};
-use grammers_session::{PackedChat, Session};
-use jni::JNIEnv;
-use jni::objects::{JObject, JString};
-use jni::sys::{jboolean, jint, jlong, jstring};
+use grammers_client::types::{LoginToken, Message as OgMessage};
+use grammers_client::{Client, Config, InitParams};
+use grammers_session::{PackedChat, Session, UpdateState};
+use grammers_tl_types as tl;
 use log;
 use log::{error, info, Level};
 use once_cell::sync::OnceCell;
+use std::collections::HashMap;
+use std::fmt;
+use std::future::Future;
+use std::net::SocketAddr;
+use std::net::{Ipv4Addr, Ipv6Addr};
+use std::sync::Mutex;
+use std::time::SystemTime;
 use tokio::runtime;
 use tokio::runtime::Runtime;
 
+include!(concat!(env!("OUT_DIR"), "/talaria.uniffi.rs"));
+
 const LOG_MIN_LEVEL: Level = Level::Trace;
 const LOG_TAG: &str = ".native.talari";
-const API_ID: i32 = 0;
-const API_HASH: &str = "";
-
-type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+const API_ID: i32 = {
+    let mut index = 0;
+    let mut value = 0;
+    let api_id = env!("TALARIA_API_ID");
+    let bytes = api_id.as_bytes();
+    while index < bytes.len() {
+        match bytes[index] {
+            b @ b'0'..=b'9' => value = value * 10 + (b - b'0') as i32,
+            _ => panic!("non-digit character found in API ID"),
+        }
+        index += 1
+    }
+    value
+};
+const API_HASH: &str = env!("TALARIA_API_HASH");
+const SERVER_ADDR: &str = env!("TALARIA_SERVER_ADDR");
 
 static RUNTIME: OnceCell<Runtime> = OnceCell::new();
 static CLIENT: OnceCell<Client> = OnceCell::new();
+static DATABASE: Mutex<Option<sqlite::Connection>> = Mutex::new(None);
+
+#[derive(Debug, Clone, Copy)]
+pub enum NativeError {
+    Initialization,
+    Database,
+    Network,
+}
+
+impl fmt::Display for NativeError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::Initialization => write!(f, "a resource could not be initialized correctly"),
+            Self::Database => write!(f, "a query to the local database failed"),
+            Self::Network => write!(f, "a network request could not complete successfully"),
+        }
+    }
+}
+
+impl std::error::Error for NativeError {}
+
+struct LoginProcedure {
+    token: Mutex<Option<LoginToken>>,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum MessageAck {
+    Received,
+    Seen,
+    Sent,
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum Formatting {
+    Unknown,
+    Mention,
+    HashTag,
+    BotCommand,
+    Url,
+    Email,
+    Bold,
+    Italic,
+    Code,
+    Pre,
+    TextUrl,
+    MentionName,
+    Phone,
+    CashTag,
+    Underline,
+    Strike,
+    Blockquote,
+    BankCard,
+    Spoiler,
+    CustomEmoji,
+}
+
+#[derive(Debug, Clone)]
+pub struct TextFormat {
+    format: Formatting,
+    offset: i32,
+    length: i32,
+    extra: Option<String>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Message {
+    id: i32,
+    sender: String,
+    text: String,
+    date: SystemTime,
+    edit_date: Option<SystemTime>,
+    formatting: Vec<TextFormat>,
+}
+
+#[derive(Debug, Clone)]
+pub struct MessagePreview {
+    sender: String,
+    text: String,
+    date: SystemTime,
+    ack: MessageAck,
+}
+
+#[derive(Debug, Clone)]
+pub struct Dialog {
+    id: String,
+    title: String,
+    last_message: Option<MessagePreview>,
+    pinned: bool,
+}
+
+type Result<T> = std::result::Result<T, NativeError>;
 
 fn block_on<F: Future>(future: F) -> F::Output {
     if RUNTIME.get().is_none() {
@@ -41,7 +150,22 @@ fn block_on<F: Future>(future: F) -> F::Output {
     RUNTIME.get().unwrap().block_on(future)
 }
 
-async fn init_client() -> Result<()> {
+pub fn init_database(path: String) -> Result<()> {
+    let mut guard = DATABASE.lock().unwrap();
+    if guard.is_some() {
+        info!("Database is already initialized");
+    }
+
+    match db::init_connection(&path) {
+        Ok(conn) => {
+            *guard = Some(conn);
+            Ok(())
+        }
+        Err(_) => Err(NativeError::Database),
+    }
+}
+
+pub fn init_client() -> Result<()> {
     android_logger::init_once(
         android_logger::Config::default()
             .with_min_level(LOG_MIN_LEVEL)
@@ -53,188 +177,275 @@ async fn init_client() -> Result<()> {
         return Ok(());
     }
 
+    let guard = DATABASE.lock().unwrap();
+    let conn = match guard.as_ref() {
+        Some(c) => c,
+        None => {
+            error!("Database was not initialized");
+            return Err(NativeError::Initialization);
+        }
+    };
+
     info!("Connecting to Telegram...");
 
-    let client = Client::connect(Config {
-        session: Session::new(),
+    let session = Session::new();
+
+    let sessions = db::get_sessions(conn).map_err(|_| NativeError::Database)?;
+    if let Some(s) = sessions.get(0) {
+        match (s.user_id, s.dc_id, s.bot) {
+            (Some(id), Some(dc), Some(bot)) => session.set_user(id, dc, bot),
+            _ => {}
+        }
+
+        match (s.pts, s.qts, s.seq, s.date) {
+            (Some(pts), Some(qts), Some(seq), Some(date)) => session.set_state(UpdateState {
+                pts,
+                qts,
+                seq,
+                date,
+                channels: HashMap::new(),
+            }),
+            _ => {}
+        }
+
+        match (s.dc_id, s.dc_addr.as_ref(), s.dc_port, s.dc_auth) {
+            (Some(id), Some(addr), Some(port), Some(auth)) => {
+                session.insert_dc(id, SocketAddr::new(addr.parse().unwrap(), port), auth)
+            }
+            _ => {}
+        }
+    }
+
+    let client = block_on(Client::connect(Config {
+        session,
         api_id: API_ID,
         api_hash: API_HASH.to_string(),
-        params: Default::default(),
-    })
-        .await?;
+        params: InitParams {
+            server_addr: if SERVER_ADDR.is_empty() {
+                None
+            } else {
+                Some(SERVER_ADDR.parse().unwrap())
+            },
+            ..Default::default()
+        },
+    }))
+    .map_err(|_| NativeError::Network)?;
 
     info!("Connected!");
 
     CLIENT
         .set(client)
-        .map_err(|_| "Client was already initialized")?;
+        .map_err(|_| NativeError::Initialization)?;
 
     Ok(())
 }
 
-async fn need_login() -> Result<bool> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
-    Ok(client.is_authorized().await?)
+pub fn need_login() -> Result<bool> {
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+    block_on(client.is_authorized()).map_err(|_| NativeError::Network)
 }
 
-async fn request_login_code(phone: &str) -> Result<LoginToken> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
-    let token = client.request_login_code(&phone, API_ID, API_HASH).await?;
-    Ok(token)
+impl LoginProcedure {
+    fn new() -> Self {
+        Self {
+            token: Mutex::new(None),
+        }
     }
 
-async fn sign_in(token: LoginToken, code: &str) -> Result<()> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
-    client.sign_in(&token, &code).await?;
+    fn request_login_code(&self, phone: String) -> Result<()> {
+        let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+        let token = block_on(client.request_login_code(&phone, API_ID, API_HASH))
+            .map_err(|_| NativeError::Network)?;
+        *self.token.lock().unwrap() = Some(token);
         Ok(())
     }
 
-async fn get_dialogs() -> Result<Vec<Dialog>> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
+    fn sign_in(&self, code: String) -> Result<()> {
+        let token = self
+            .token
+            .lock()
+            .unwrap()
+            .take()
+            .ok_or(NativeError::Initialization)?;
+        let client = CLIENT.get().ok_or(NativeError::Initialization)?;
 
+        block_on(client.sign_in(&token, &code)).map_err(|_| NativeError::Network)?;
+
+        let guard = DATABASE.lock().unwrap();
+        let conn = match guard.as_ref() {
+            Some(c) => c,
+            None => {
+                error!("Database was not initialized");
+                return Err(NativeError::Initialization);
+            }
+        };
+
+        let mut session = db::create_session(conn).map_err(|_| NativeError::Database)?;
+        let s = client.session();
+        if let Some(user) = s.get_user() {
+            session.user_id = Some(user.id);
+            session.dc_id = Some(user.dc);
+            session.bot = Some(user.bot);
+        }
+
+        if let Some(state) = s.get_state() {
+            session.pts = Some(state.pts);
+            session.qts = Some(state.qts);
+            session.seq = Some(state.seq);
+            session.date = Some(state.date);
+        }
+
+        if let Some(dc_id) = session.dc_id {
+            for dc in s.get_dcs() {
+                if dc.id == dc_id {
+                    if let Some(ipv4) = dc.ipv4 {
+                        session.dc_addr = Some(Ipv4Addr::from(ipv4.to_le_bytes()).to_string())
+                    } else if let Some(ipv6) = dc.ipv6 {
+                        session.dc_addr = Some(Ipv6Addr::from(ipv6).to_string())
+                    }
+                    session.dc_port = Some(dc.port as u16);
+                    session.dc_auth = dc.auth.map(|b| b.try_into().unwrap());
+                    break;
+                }
+            }
+        }
+
+        db::update_session(conn, &session).map_err(|_| NativeError::Database)?;
+
+        Ok(())
+    }
+}
+
+pub fn get_dialogs() -> Result<Vec<Dialog>> {
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+
+    block_on(async {
         let mut result = Vec::new();
         let mut dialogs = client.iter_dialogs();
-    while let Some(dialog) = dialogs.next().await? {
+        while let Some(dialog) = dialogs.next().await.map_err(|_| NativeError::Network)? {
             result.push(dialog);
         }
         Ok(result)
+    })
+    .map(|dialogs| {
+        dialogs
+            .into_iter()
+            .map(|d| Dialog {
+                id: d.chat().pack().to_hex(),
+                title: d.chat().name().to_string(),
+                last_message: d.last_message.map(|m| MessagePreview {
+                    sender: if let Some(sender) = m.sender() {
+                        sender.name().to_string()
+                    } else {
+                        "unknown".to_string()
+                    },
+                    text: m.text().to_string(),
+                    date: m.date().into(),
+                    ack: if m.outgoing() {
+                        match &d.dialog {
+                            tl::enums::Dialog::Dialog(d) => {
+                                if m.id() <= d.read_inbox_max_id {
+                                    MessageAck::Seen
+                                } else {
+                                    MessageAck::Sent
+                                }
+                            }
+                            tl::enums::Dialog::Folder(_) => MessageAck::Received,
+                        }
+                    } else {
+                        MessageAck::Received
+                    },
+                }),
+                pinned: match d.dialog {
+                    tl::enums::Dialog::Dialog(d) => d.pinned,
+                    tl::enums::Dialog::Folder(f) => f.pinned,
+                },
+            })
+            .collect()
+    })
 }
 
-async fn send_message(chat: PackedChat, text: &str) -> Result<()> {
-    let client = CLIENT.get().ok_or("Client not initialized")?;
-    client.send_message(chat, text).await?;
-    Ok(())
+fn adapt_message(m: OgMessage) -> Message {
+    Message {
+        id: m.id(),
+        sender: if let Some(sender) = m.sender() {
+            sender.name().to_string()
+        } else {
+            "unknown".to_string()
+        },
+        text: m.text().to_string(),
+        date: m.date().into(),
+        edit_date: m.edit_date().map(|d| d.into()),
+        formatting: if let Some(entities) = m.fmt_entities() {
+            use tl::enums::MessageEntity as ME;
+
+            macro_rules! tf {
+                ($formatting:ident($entity:ident)) => {
+                    tf!($formatting($entity).extra(None))
+                };
+                ($formatting:ident($entity:ident).extra($extra:expr)) => {
+                    TextFormat {
+                        format: Formatting::$formatting,
+                        offset: $entity.offset,
+                        length: $entity.length,
+                        extra: $extra,
+                    }
+                };
             }
 
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_initClient(_: JNIEnv, _: JObject) {
-    match block_on(init_client()) {
-        Ok(_) => info!("Client initialized"),
-        Err(e) => error!("Failed to initialize client: {}", e),
+            entities
+                .into_iter()
+                .map(|e| match e {
+                    ME::Unknown(e) => tf!(Unknown(e)),
+                    ME::Mention(e) => tf!(Mention(e)),
+                    ME::Hashtag(e) => tf!(HashTag(e)),
+                    ME::BotCommand(e) => tf!(BotCommand(e)),
+                    ME::Url(e) => tf!(Url(e)),
+                    ME::Email(e) => tf!(Email(e)),
+                    ME::Bold(e) => tf!(Bold(e)),
+                    ME::Italic(e) => tf!(Italic(e)),
+                    ME::Code(e) => tf!(Code(e)),
+                    ME::Pre(e) => tf!(Pre(e).extra(Some(e.language.to_string()))),
+                    ME::TextUrl(e) => tf!(TextUrl(e).extra(Some(e.url.to_string()))),
+                    ME::MentionName(e) => tf!(MentionName(e).extra(Some(e.user_id.to_string()))),
+                    ME::InputMessageEntityMentionName(e) => tf!(Unknown(e)),
+                    ME::Phone(e) => tf!(Phone(e)),
+                    ME::Cashtag(e) => tf!(CashTag(e)),
+                    ME::Underline(e) => tf!(Underline(e)),
+                    ME::Strike(e) => tf!(Strike(e)),
+                    ME::Blockquote(e) => tf!(Blockquote(e)),
+                    ME::BankCard(e) => tf!(BankCard(e)),
+                    ME::Spoiler(e) => tf!(Spoiler(e)),
+                    ME::CustomEmoji(e) => {
+                        tf!(CustomEmoji(e).extra(Some(e.document_id.to_string())))
+                    }
+                })
+                .collect()
+        } else {
+            Vec::new()
+        },
     }
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_needLogin(
-    _: JNIEnv,
-    _: JObject,
-) -> jboolean {
-    match block_on(need_login()) {
-        Ok(login) => login.into(),
-        Err(e) => {
-            error!("Failed to check if user is authorized: {}", e);
-            false.into()
-        }
+pub fn get_messages(packed: String) -> Result<Vec<Message>> {
+    let chat = PackedChat::from_hex(&packed).unwrap();
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+
+    block_on(async {
+        let mut result = Vec::new();
+        let mut messages = client.iter_messages(chat);
+        while let Some(message) = messages.next().await.map_err(|_| NativeError::Network)? {
+            result.push(message);
         }
+        Ok(result)
+    })
+    .map(|messages| messages.into_iter().map(adapt_message).collect())
 }
 
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_requestLoginCode(
-    env: JNIEnv,
-    _: JObject,
-    phone: JString,
-) -> jlong {
-    let phone = CString::from(CStr::from_ptr(env.get_string(phone).unwrap().as_ptr()));
-
-    match block_on(request_login_code(phone.to_str().unwrap())) {
-        Ok(token) => Box::into_raw(Box::new(token)) as jlong,
-        Err(e) => {
-            error!("Failed to request login code: {}", e);
-            0 as jlong
-        }
-    }
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_signIn(
-    env: JNIEnv,
-    _: JObject,
-    token_ptr: jlong,
-    code: JString,
-) {
-    let token = *Box::from_raw(token_ptr as *mut LoginToken);
-    let code = CString::from(CStr::from_ptr(env.get_string(code).unwrap().as_ptr()));
-
-    match block_on(sign_in(token, code.to_str().unwrap())) {
-        Ok(_) => info!("Sign in success"),
-        Err(e) => error!("Failed to sign in: {}", e),
-    }
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_getDialogs(
-    _: JNIEnv,
-    _: JObject,
-) -> jlong {
-    match block_on(get_dialogs()) {
-        Ok(dialogs) => Box::into_raw(Box::new(dialogs)) as jlong,
-        Err(e) => {
-            error!("Failed to get dialogs: {}", e);
-            0 as jlong
-        }
-    }
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogCount(
-    _: JNIEnv,
-    _: JObject,
-    dialogs_ptr: jlong,
-) -> jint {
-    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
-    dialogs.len() as jint
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogPacked(
-    env: JNIEnv,
-    _: JObject,
-    dialogs_ptr: jlong,
-    index: jint,
-) -> jstring {
-    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
-
-    let packed = dialogs[index as usize].chat().pack().to_hex();
-    let output = env.new_string(packed).unwrap();
-    output.into_inner()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_dialogTitle(
-    env: JNIEnv,
-    _: JObject,
-    dialogs_ptr: jlong,
-    index: jint,
-) -> jstring {
-    let dialogs = Box::leak(Box::from_raw(dialogs_ptr as *mut Vec<Dialog>));
-
-    let title = dialogs[index as usize].chat().name();
-    let output = env.new_string(title).unwrap();
-    output.into_inner()
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_freeDialogs(
-    _: JNIEnv,
-    _: JObject,
-    dialogs_ptr: jlong,
-) {
-    let _ = Box::from_raw(dialogs_ptr as *mut Vec<Dialog>);
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn Java_dev_lonami_talaria_bindings_Native_sendMessage(
-    env: JNIEnv,
-    _: JObject,
-    packed: JString,
-    text: JString,
-) {
-    let packed = CString::from(CStr::from_ptr(env.get_string(packed).unwrap().as_ptr()));
-    let text = CString::from(CStr::from_ptr(env.get_string(text).unwrap().as_ptr()));
-
-    let packed = PackedChat::from_hex(packed.to_str().unwrap()).unwrap();
-    match block_on(send_message(packed, text.to_str().unwrap())) {
-        Ok(_) => info!("Message sent"),
-        Err(e) => error!("Failed to send message: {}", e),
-    }
+pub fn send_message(packed: String, text: String) -> Result<Message> {
+    let chat = PackedChat::from_hex(&packed).unwrap();
+    let client = CLIENT.get().ok_or(NativeError::Initialization)?;
+    block_on(client.send_message(chat, text))
+        .map(adapt_message)
+        .map_err(|_| NativeError::Network)
 }

native/src/talaria.udl

@@ -0,0 +1,88 @@
+[Error]
+enum NativeError {
+  "Initialization",
+  "Database",
+  "Network",
+};
+
+enum MessageAck {
+    "Received",
+    "Seen",
+    "Sent",
+};
+
+enum Formatting {
+    "Unknown",
+    "Mention",
+    "HashTag",
+    "BotCommand",
+    "Url",
+    "Email",
+    "Bold",
+    "Italic",
+    "Code",
+    "Pre",  // language:string
+    "TextUrl",  // url:string
+    "MentionName",  // user_id:long
+    "Phone",
+    "CashTag",
+    "Underline",
+    "Strike",
+    "Blockquote",
+    "BankCard",
+    "Spoiler",
+    "CustomEmoji",  // document_id:long
+};
+
+dictionary TextFormat {
+    Formatting format;
+    i32 offset;
+    i32 length;
+    string? extra;
+};
+
+dictionary Message {
+    i32 id;
+    string sender;
+    string text;
+    timestamp date;
+    timestamp? edit_date;
+    sequence<TextFormat> formatting;
+};
+
+dictionary MessagePreview {
+    string sender;
+    string text;
+    timestamp date;
+    MessageAck ack;
+};
+
+dictionary Dialog {
+    string id;
+    string title;
+    MessagePreview? last_message;
+    boolean pinned;
+};
+
+interface LoginProcedure {
+    constructor();
+    [Throws=NativeError]
+    void request_login_code(string phone);
+    [Throws=NativeError]
+    void sign_in(string code);
+};
+
+namespace talaria {
+    [Throws=NativeError]
+    void init_database(string path);
+    [Throws=NativeError]
+    void init_client();
+    [Throws=NativeError]
+    boolean need_login();
+    [Throws=NativeError]
+    sequence<Dialog> get_dialogs();
+    [Throws=NativeError]
+    sequence<Message> get_messages(string packed);
+    [Throws=NativeError]
+    Message send_message(string packed, string text);
+};