[Chat][Feature] participant system messages (#525)

azure-communication-ui/chat/src/main/java/com/azure/android/communication/ui/chat/models/MessageInfoModel.kt

@@ -15,6 +15,7 @@ internal data class MessageInfoModel(
     val internalId: String? = null,
     val messageType: ChatMessageType?,
     val content: String?,
+    val participants: List<String> = emptyList(),
     val version: String? = null,
     val senderDisplayName: String? = null,
     val createdOn: OffsetDateTime? = null,
@@ -29,6 +30,7 @@ internal fun com.azure.android.communication.chat.models.ChatMessage.into(): Mes
         id = this.id,
         messageType = this.type.into(),
         content = this.content.message,
+        participants = this.content.participants?.map { it.displayName }?.toList() ?: emptyList(),
         internalId = null,
         version = this.version,
         senderDisplayName = this.senderDisplayName,
@@ -46,6 +48,7 @@ internal fun com.azure.android.communication.chat.models.ChatMessageReceivedEven
         messageType = this.type.into(),
         version = this.version,
         content = this.content,
+        participants = emptyList(),
         senderCommunicationIdentifier = this.sender.into(),
         senderDisplayName = this.senderDisplayName,
         createdOn = this.createdOn,
@@ -61,6 +64,7 @@ internal fun com.azure.android.communication.chat.models.ChatMessageEditedEvent.
         messageType = null,
         version = this.version,
         content = this.content,
+        participants = emptyList(),
         senderCommunicationIdentifier = this.sender.into(),
         senderDisplayName = this.senderDisplayName,
         createdOn = this.createdOn,
@@ -76,6 +80,7 @@ internal fun com.azure.android.communication.chat.models.ChatMessageDeletedEvent
         messageType = null,
         version = this.version,
         content = null,
+        participants = emptyList(),
         senderCommunicationIdentifier = this.sender.into(),
         senderDisplayName = this.senderDisplayName,
         createdOn = this.createdOn,
@@ -88,6 +93,7 @@ internal val EMPTY_MESSAGE_INFO_MODEL = MessageInfoModel(
     id = "",
     messageType = null,
     content = "",
+    participants = emptyList(),
     internalId = "",
     version = "",
     senderDisplayName = "",

azure-communication-ui/chat/src/main/java/com/azure/android/communication/ui/chat/presentation/ui/chat/components/MessageView.kt

@@ -47,18 +47,32 @@ internal fun MessageView(viewModel: MessageViewModel) {
 
 @Composable
 private fun UserJoinedMessage(viewModel: MessageViewModel) {
-    BasicText(
-        "${viewModel.message.senderDisplayName} joined the chat",
-        style = ChatCompositeTheme.typography.systemMessage
-    )
+    if (viewModel.message.participants.size <= 1) {
+        BasicText(
+            "${viewModel.message.participants.firstOrNull() ?: "Unknown"} joined the chat",
+            style = ChatCompositeTheme.typography.systemMessage
+        )
+    } else {
+        BasicText(
+            "${viewModel.message.participants.joinToString(", ")} joined the chat",
+            style = ChatCompositeTheme.typography.systemMessage
+        )
+    }
 }
 
 @Composable
 private fun UserLeftMessage(viewModel: MessageViewModel) {
-    BasicText(
-        "${viewModel.message.senderDisplayName} left the chat",
-        style = ChatCompositeTheme.typography.systemMessage
-    )
+    if (viewModel.message.participants.size <= 1) {
+        BasicText(
+            "${viewModel.message.participants.firstOrNull() ?: "Unknown"} left the chat",
+            style = ChatCompositeTheme.typography.systemMessage
+        )
+    } else {
+        BasicText(
+            "${viewModel.message.participants.joinToString(", ")} left the chat",
+            style = ChatCompositeTheme.typography.systemMessage
+        )
+    }
 }
 
 @Composable

azure-communication-ui/chat/src/main/java/com/azure/android/communication/ui/chat/preview/PreviewData.kt

@@ -44,7 +44,8 @@ internal val MOCK_MESSAGES get(): List<MessageInfoModel> {
             content = null,
             messageType = ChatMessageType.PARTICIPANT_ADDED,
             senderCommunicationIdentifier = userC_ID,
-            senderDisplayName = userC_Display,
+            participants = listOf(userC_Display, userA_Display),
+            senderDisplayName = null,
             id = null,
             internalId = null
         ),
@@ -61,7 +62,8 @@ internal val MOCK_MESSAGES get(): List<MessageInfoModel> {
             content = null,
             messageType = ChatMessageType.PARTICIPANT_REMOVED,
             senderCommunicationIdentifier = userD_ID,
-            senderDisplayName = userD_Display,
+            senderDisplayName = null,
+            participants = listOf(userD_Display),
             id = null,
             internalId = null
         ),