composeApp/build.gradle.kts

@@ -25,7 +25,7 @@ kotlin {
             implementation("org.jetbrains.compose.material3:material3:1.11.0-alpha07")
             implementation("io.coil-kt.coil3:coil-compose:3.4.0")
             implementation("io.coil-kt.coil3:coil-network-okhttp:3.4.0")
-            implementation("su.reya:nostr-sdk-kmp:0.2.1")
+            implementation("su.reya:nostr-sdk-kmp:0.2.2")
         }
         commonMain.dependencies {
             implementation(libs.compose.runtime)

composeApp/src/androidMain/composeResources/drawable/ic_send.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M440,800L440,313L216,537L160,480L480,160L800,480L744,537L520,313L520,800L440,800Z" />
+</vector>

composeApp/src/androidMain/kotlin/su/reya/coop/screens/ChatScreen.kt

@@ -2,12 +2,15 @@ package su.reya.coop.screens
 
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.IntrinsicSize
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.widthIn
@@ -15,8 +18,10 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.FilledTonalIconButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.IconButtonDefaults
 import androidx.compose.material3.LoadingIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
@@ -31,6 +36,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateListOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
@@ -39,16 +45,19 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import coil3.compose.AsyncImage
 import coop.composeapp.generated.resources.Res
 import coop.composeapp.generated.resources.ic_arrow_back
 import coop.composeapp.generated.resources.ic_avatar
+import coop.composeapp.generated.resources.ic_send
 import org.jetbrains.compose.resources.painterResource
 import rust.nostr.sdk.Event
 import su.reya.coop.LocalNostrViewModel
 import su.reya.coop.LocalSnackbarHostState
 import su.reya.coop.humanReadable
+import su.reya.coop.roomId
 import su.reya.coop.shared.displayNameFlow
 import su.reya.coop.shared.pictureFlow
 
@@ -59,18 +68,41 @@ fun ChatScreen(
 ) {
     val snackbarHostState = LocalSnackbarHostState.current
     val viewModel = LocalNostrViewModel.current
+
     val room = viewModel.getChatRoom(id)
     val displayName by remember(room) { room.displayNameFlow(viewModel) }.collectAsState("Loading...")
     val picture by remember(room) { room.pictureFlow(viewModel) }.collectAsState(null)
 
     var text by remember { mutableStateOf("") }
-    var messages by remember { mutableStateOf<List<Event>>(emptyList()) }
     var loading by remember { mutableStateOf(true) }
 
+    val messages = remember { mutableStateListOf<Event>() }
+
+    fun setLoading(value: Boolean) {
+        loading = value
+    }
+
     LaunchedEffect(id) {
-        loading = true
-        messages = viewModel.getChatRoomMessages(id)
-        loading = false
+        // Start loading spinner
+        setLoading(true)
+
+        // Get messages
+        val initialMessages = viewModel.getChatRoomMessages(id)
+        messages.clear()
+        messages.addAll(initialMessages)
+
+        // Get msg relays for each member
+        viewModel.chatRoomConnect(id)
+
+        // Stop loading spinner
+        setLoading(false)
+
+        // Handle new messages
+        viewModel.newEvents.collect { event ->
+            if (event.roomId() == id) {
+                messages.add(0, event)
+            }
+        }
     }
 
     Scaffold(
@@ -153,7 +185,7 @@ fun ChatScreen(
                             value = text,
                             onValueChange = { text = it },
                             onSend = {
-                                // TODO: Implement send logic
+                                viewModel.sendMessage(id, text)
                                 text = ""
                             }
                         )
@@ -190,10 +222,13 @@ fun ChatMessage(
             .padding(vertical = 4.dp),
         contentAlignment = if (isMine) Alignment.CenterEnd else Alignment.CenterStart
     ) {
-        Column {
+        Column(
+            horizontalAlignment = if (isMine) Alignment.End else Alignment.Start
+        ) {
             Text(
                 text = event.createdAt().humanReadable(),
                 style = MaterialTheme.typography.labelSmall,
+                textAlign = if (isMine) TextAlign.End else TextAlign.Start,
             )
             Spacer(modifier = Modifier.size(4.dp))
             Surface(
@@ -218,24 +253,41 @@ fun ChatInput(
     onValueChange: (String) -> Unit,
     onSend: () -> Unit
 ) {
+
     Surface(modifier = Modifier.fillMaxWidth()) {
         Row(
             modifier = Modifier
                 .padding(horizontal = 16.dp, vertical = 8.dp)
-                .imePadding(),
-            verticalAlignment = Alignment.CenterVertically
+                .height(IntrinsicSize.Min),
+            verticalAlignment = Alignment.Bottom
         ) {
             TextField(
                 value = value,
                 onValueChange = onValueChange,
                 placeholder = { Text("Message") },
-                modifier = Modifier.weight(1f),
-                shape = CircleShape,
+                shape = RoundedCornerShape(28.dp),
                 colors = TextFieldDefaults.colors(
                     focusedIndicatorColor = Color.Transparent,
                     unfocusedIndicatorColor = Color.Transparent
-                )
+                ),
+                modifier = Modifier.weight(1f)
             )
+            Spacer(modifier = Modifier.size(8.dp))
+            FilledTonalIconButton(
+                onClick = onSend,
+                modifier = Modifier
+                    .fillMaxHeight()
+                    .aspectRatio(1f),
+                colors = IconButtonDefaults.filledTonalIconButtonColors(
+                    containerColor = MaterialTheme.colorScheme.surfaceVariant,
+                    contentColor = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            ) {
+                Icon(
+                    painter = painterResource(Res.drawable.ic_send),
+                    contentDescription = "Send"
+                )
+            }
         }
     }
 }

shared/build.gradle.kts

@@ -28,7 +28,7 @@ kotlin {
             implementation("org.jetbrains.androidx.lifecycle:lifecycle-viewmodel-compose:2.10.0")
             implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.10.2")
             implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.8.0")
-            implementation("su.reya:nostr-sdk-kmp:0.2.1")
+            implementation("su.reya:nostr-sdk-kmp:0.2.2")
             implementation("com.squareup.okio:okio:3.16.2")
             implementation(libs.ktor.client.core)
             implementation(libs.ktor.client.websockets)

shared/src/commonMain/kotlin/su/reya/coop/Nostr.kt

@@ -2,6 +2,10 @@ package su.reya.coop
 
 import io.ktor.client.HttpClient
 import io.ktor.client.plugins.websocket.WebSockets
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import rust.nostr.sdk.AckPolicy
 import rust.nostr.sdk.AsyncNostrSigner
 import rust.nostr.sdk.Client
@@ -32,10 +36,12 @@ import rust.nostr.sdk.SendEventTarget
 import rust.nostr.sdk.SleepWhenIdle
 import rust.nostr.sdk.SubscribeAutoCloseOptions
 import rust.nostr.sdk.Tag
+import rust.nostr.sdk.TagKind
 import rust.nostr.sdk.Timestamp
 import rust.nostr.sdk.UnsignedEvent
 import rust.nostr.sdk.UnwrappedGift
 import rust.nostr.sdk.initLogger
+import rust.nostr.sdk.makePrivateMsgAsync
 import rust.nostr.sdk.nip17ExtractRelayList
 import kotlin.time.Duration
 
@@ -46,6 +52,8 @@ class Nostr {
         private set
     var deviceSigner: AsyncNostrSigner? = null
         private set
+    var msgRelayList: Map<PublicKey, List<RelayUrl>> = emptyMap()
+        private set
     var contactList: List<PublicKey> = emptyList()
         private set
 
@@ -94,7 +102,8 @@ class Nostr {
         client?.shutdown()
     }
 
-    fun exit() {
+    suspend fun exit() {
+        signer.switch(Keys.generate())
         deviceSigner = null
         contactList = emptyList()
     }
@@ -164,17 +173,23 @@ class Nostr {
 
             client?.subscribe(
                 target = ReqTarget.manual(target),
-                id = "user-messages"
+                id = "messages"
             )
         } catch (e: Exception) {
             throw IllegalStateException("Failed to fetch user messages: ${e.message}", e)
         }
     }
 
-    suspend fun handleNotifications(onMetadataUpdate: (PublicKey, Metadata) -> Unit) {
+    suspend fun handleNotifications(
+        onMetadataUpdate: (PublicKey, Metadata) -> Unit,
+        onEose: () -> Unit,
+        onNewMessage: (Event) -> Unit
+    ) = coroutineScope {
         val now = Timestamp.now()
         val processedEvent = mutableSetOf<EventId>()
-        val notifications = client?.notifications() ?: return
+        val notifications = client?.notifications() ?: return@coroutineScope
+
+        var eoseTrackerJob: Job? = null
 
         while (true) {
             val notification = notifications.next() ?: continue
@@ -204,12 +219,30 @@ class Nostr {
                                 if (isSignedByUser(event = event)) {
                                     getUserMessages(msgRelayList = event)
                                 }
+                                // Cache the relay list for future use
+                                setMsgRelay(pubkey = event.author(), event = event)
                             }
 
                             if (event.kind().asStd()?.equals(KindStandard.GIFT_WRAP) == true) {
                                 try {
                                     val rumor = extractRumor(event)
-                                    // TODO: Handle rumor
+
+                                    // Logic to notify UI after processing
+                                    // Cancel previous tracker if it exists
+                                    eoseTrackerJob?.cancel()
+                                    // Start a new tracker
+                                    eoseTrackerJob = launch {
+                                        delay(10000) // Wait for 10 seconds
+                                        onEose()
+                                    }
+
+                                    // Handle new message
+                                    rumor?.createdAt()?.asSecs()?.let {
+                                        if (it >= now.asSecs()) {
+                                            // TODO: only send unsigned event
+                                            onNewMessage(rumor.signWithKeys(Keys.generate()))
+                                        }
+                                    }
                                 } catch (e: Exception) {
                                     println("Failed to extract rumor: $e")
                                 }
@@ -218,7 +251,10 @@ class Nostr {
 
                         is RelayMessageEnum.EndOfStoredEvents -> {
                             val subscriptionId = message.subscriptionId
-                            // TODO: Handle end of stored events
+
+                            if (subscriptionId == "messages") {
+                                onEose()
+                            }
                         }
 
                         else -> {
@@ -238,6 +274,11 @@ class Nostr {
         }
     }
 
+    private fun setMsgRelay(pubkey: PublicKey, event: Event) {
+        val relays = nip17ExtractRelayList(event)
+        msgRelayList = msgRelayList + (pubkey to relays)
+    }
+
     private suspend fun getCachedRumor(giftId: EventId): UnsignedEvent? {
         try {
             val filter = Filter().identifier(giftId.toBech32())
@@ -245,16 +286,18 @@ class Nostr {
 
             return event?.content()?.let { UnsignedEvent.fromJson(it) }
         } catch (e: Exception) {
-            println("Failed to get cached rumor: ${e.message}")
-            return null
+            throw IllegalStateException("Failed to get cached rumor: ${e.message}", e)
         }
     }
 
     private suspend fun setCachedRumor(giftId: EventId, rumor: UnsignedEvent) {
-        if (rumor.id() == null) return
-
         try {
             val rngKeys = Keys.generate()
+
+            // Ensure the rumor ID is set
+            val rumor = rumor.ensureId()
+
+            // Construct a reference event
             val kind = Kind.fromStd(KindStandard.APPLICATION_SPECIFIC_DATA);
             val tags = listOf(Tag.identifier(giftId.toBech32()), Tag.event(rumor.id()!!))
             val event = EventBuilder(kind, rumor.asJson()).tags(tags).signWithKeys(rngKeys)
@@ -444,7 +487,10 @@ class Nostr {
                     val room = Room.new(rumor = event, userPubkey = userPubkey)
 
                     // Check if the room already exists
-                    if (rooms.contains(room)) return@forEach
+                    if (rooms.contains(room)) {
+                        room.setCreatedAt(room.createdAt)
+                        room.setLastMessage(room.lastMessage)
+                    }
 
                     val filter =
                         Filter().kind(kind).author(userPubkey).pubkeys(room.members.toList());
@@ -473,18 +519,95 @@ class Nostr {
     suspend fun getChatRoomMessages(members: List<PublicKey>): List<Event> {
         try {
             val userPubkey = signer.currentUser ?: throw IllegalStateException("User not signed in")
-
             val kind = Kind.fromStd(KindStandard.PRIVATE_DIRECT_MESSAGE)
-            val sendFilter = Filter().kind(kind).author(userPubkey).pubkeys(members)
-            val recvFilter = Filter().kind(kind).pubkey(userPubkey).authors(members)
 
+            val sendFilter = Filter().kind(kind).author(userPubkey).pubkeys(members)
             val sendEvents = client?.database()?.query(sendFilter)
+
+            val recvFilter = Filter().kind(kind).authors(members).pubkey(userPubkey)
             val recvEvents = client?.database()?.query(recvFilter)
-            val events = sendEvents?.merge(recvEvents!!)?.toVec()
+
+            // Merge the events
+            val events = sendEvents
+                ?.merge(recvEvents!!)
+                ?.toVec()
+                ?.sortedByDescending { it.createdAt().asSecs() }
 
             return events ?: emptyList()
         } catch (e: Exception) {
             throw IllegalStateException("Failed to get chat room messages: ${e.message}", e)
         }
     }
+
+    suspend fun chatRoomConnect(members: List<PublicKey>) {
+        try {
+            members.forEach { member ->
+                val kind = Kind.fromStd(KindStandard.INBOX_RELAYS)
+                val filter = Filter().kind(kind).author(member).limit(1u)
+                val opts = SubscribeAutoCloseOptions().exitPolicy(ReqExitPolicy.ExitOnEose)
+
+                client?.subscribe(
+                    target = ReqTarget.auto(listOf(filter)),
+                    closeOn = opts
+                )
+            }
+        } catch (e: Exception) {
+            throw IllegalStateException("Failed to connect to chat room: ${e.message}", e)
+        }
+    }
+
+    suspend fun sendMessage(
+        to: List<PublicKey>,
+        content: String,
+        subject: String? = null,
+        replies: List<EventId> = emptyList()
+    ) {
+        try {
+            val currentUser =
+                signer.currentUser ?: throw IllegalStateException("User not signed in")
+
+            val tags = mutableListOf<Tag>()
+
+            // Add a subject tag if provided
+            if (subject != null) {
+                tags.add(Tag.custom(TagKind.Subject, listOf(subject)))
+            }
+
+            // Add event tags for replies
+            if (replies.isNotEmpty()) {
+                replies.forEach { replyId ->
+                    tags.add(Tag.event(replyId))
+                }
+            }
+
+            // Add public key tags for each recipient
+            to.forEach { pubkey ->
+                if (pubkey != currentUser) {
+                    tags.add(Tag.publicKey(pubkey))
+                }
+            }
+
+            for (receiver in to.plus(currentUser)) {
+                // Construct the gift wrap event
+                val event = makePrivateMsgAsync(
+                    signer = signer,
+                    receiver = receiver,
+                    message = content,
+                    rumorExtraTags = tags
+                )
+
+                println("Sending message to: ${receiver.toBech32()}")
+
+                // Send the event to receiver's NIP-17 relays
+                client?.sendEvent(
+                    event = event,
+                    target = SendEventTarget.toNip17(),
+                    ackPolicy = AckPolicy.none(),
+                    authenticationTimeout = Duration.parse("2s")
+                )
+            }
+        } catch (e: Exception) {
+            throw IllegalStateException("Failed to send message: ${e.message}", e)
+        }
+    }
 }

shared/src/commonMain/kotlin/su/reya/coop/NostrViewModel.kt

@@ -7,8 +7,10 @@ import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.serialization.kotlinx.json.json
 import kotlinx.coroutines.NonCancellable
 import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.launch
@@ -16,6 +18,7 @@ import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeoutOrNull
 import kotlinx.serialization.json.Json
 import rust.nostr.sdk.Event
+import rust.nostr.sdk.EventId
 import rust.nostr.sdk.Keys
 import rust.nostr.sdk.Metadata
 import rust.nostr.sdk.NostrConnect
@@ -39,6 +42,9 @@ class NostrViewModel(
     private val _chatRooms = MutableStateFlow<Set<Room>>(emptySet())
     val chatRooms = _chatRooms.asStateFlow()
 
+    private val _newEvents = MutableSharedFlow<Event>(extraBufferCapacity = 100)
+    val newEvents = _newEvents.asSharedFlow()
+
     private val _errorEvents = Channel<String>(Channel.BUFFERED)
     val errorEvents = _errorEvents.receiveAsFlow()
 
@@ -123,9 +129,19 @@ class NostrViewModel(
 
     fun startNotificationHandler() {
         viewModelScope.launch {
-            nostr.handleNotifications { pubkey, metadata ->
-                updateMetadata(pubkey, metadata)
-            }
+            nostr.handleNotifications(
+                onMetadataUpdate = { pubkey, metadata ->
+                    updateMetadata(pubkey, metadata)
+                },
+                onEose = {
+                    getChatRooms()
+                },
+                onNewMessage = { event ->
+                    viewModelScope.launch {
+                        _newEvents.emit(event)
+                    }
+                },
+            )
         }
     }
 
@@ -299,6 +315,35 @@ class NostrViewModel(
         return emptyList()
     }
 
+    fun chatRoomConnect(roomId: Long) {
+        viewModelScope.launch {
+            try {
+                val room = getChatRoom(roomId)
+                val members = room.members
+
+                nostr.chatRoomConnect(members.toList())
+            } catch (e: Exception) {
+                showError("Error: ${e.message}")
+            }
+        }
+    }
+
+    fun sendMessage(roomId: Long, message: String, replies: List<EventId> = emptyList()) {
+        viewModelScope.launch {
+            try {
+                val room = getChatRoom(roomId)
+                nostr.sendMessage(
+                    to = room.members.toList(),
+                    content = message,
+                    subject = room.subject,
+                    replies = replies
+                )
+            } catch (e: Exception) {
+                showError("Error: ${e.message}")
+            }
+        }
+    }
+
     override fun onCleared() {
         super.onCleared()
         // Ensure all relays are disconnect

shared/src/commonMain/kotlin/su/reya/coop/Room.kt

@@ -77,6 +77,10 @@ data class Room(
         return this.copy(subject = subject)
     }
 
+    fun setLastMessage(message: String?): Room {
+        return this.copy(lastMessage = message)
+    }
+
     fun isGroup(): Boolean {
         return members.size > 1
     }