ConnectionService: optimize logic to load conversation profile

GitLab: #1689
Change-Id: I7b466f479451554c1449eaeaa4728a452f69dae9

jami-android/app/src/main/java/cx/ring/service/ConnectionService.kt

@@ -56,7 +56,7 @@ class ConnectionService : ConnectionService() {
             val contactId = request.extras.getString(ConversationPath.KEY_CONVERSATION_URI)
             if (account != null && contactId != null) {
                 try {
-                    val profile = conversationFacade.observeConversation(account, Uri.fromString(contactId), false).blockingFirst()
+                    val profile = conversationFacade.getConversationProfile(account, Uri.fromString(contactId)).blockingGet()
                     Log.w(TAG, "Set connection metadata ${profile.title} ${android.net.Uri.parse(profile.uriTitle)}")
                     setCallerDisplayName(profile.title, TelecomManager.PRESENTATION_ALLOWED)
                     setAddress(android.net.Uri.parse(profile.uriTitle), TelecomManager.PRESENTATION_UNKNOWN)

jami-android/libjamiclient/src/main/kotlin/net/jami/services/ConversationFacade.kt

@@ -262,6 +262,18 @@ class ConversationFacade(
         }
     }
 
+    fun getConversationProfile(accountId: String, conversationUri: Uri): Single<ConversationItemViewModel> =
+        startConversation(accountId, conversationUri)
+            .flatMap { getConversationProfile(it) }
+
+    private fun getConversationProfile(conversation: Conversation): Single<ConversationItemViewModel> =
+        Observable.combineLatest(
+            conversation.profile,
+            conversation.contactUpdates.switchMap { c -> mContactService.observeContact(conversation.accountId, c, false) }
+        )
+        { profile, contacts -> ConversationItemViewModel(conversation, profile, contacts, false) }
+            .firstOrError()
+
     fun observeConversation(accountId: String, conversationUri: Uri, hasPresence: Boolean): Observable<ConversationItemViewModel> =
         startConversation(accountId, conversationUri)
             .flatMapObservable { conversation -> observeConversation(conversation, hasPresence) }