feat: add support for reply message (#44)

Reviewed-on: https://git.reya.su/reya/coop-mobile/pulls/44

shared/src/commonMain/kotlin/su/reya/coop/viewmodel/ChatScreenViewModel.kt

@@ -9,6 +9,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
+import rust.nostr.sdk.EventId
 import rust.nostr.sdk.UnsignedEvent
 import su.reya.coop.Profile
 import su.reya.coop.Room
@@ -39,7 +40,7 @@ class ChatScreenViewModel(
     private fun loadMessages() {
         chatRepository.loadChatRoomMessages(id) { initialMessages ->
             messages.clear()
-            messages.addAll(initialMessages)
+            messages.addAll(initialMessages.distinctBy { it.id() })
             loading = false
         }
     }
@@ -52,7 +53,7 @@ class ChatScreenViewModel(
         viewModelScope.launch {
             chatRepository.newEvents.collect { event ->
                 if (event.roomId() == id) {
-                    if (event.id() !in messages.map { it.id() }) {
+                    if (messages.none { it.id() == event.id() }) {
                         messages.add(0, event)
                     }
                 } else {
@@ -62,8 +63,9 @@ class ChatScreenViewModel(
         }
     }
 
-    fun sendMessage(text: String) {
-        chatRepository.sendMessage(id, text)
+    fun sendMessage(text: String, replyTo: EventId? = null) {
+        val replyToList = if (replyTo != null) listOf(replyTo) else emptyList()
+        chatRepository.sendMessage(id, text, replyToList)
     }
 
     fun sendFileMessage(file: ByteArray?, type: String?) {