Add support for server conversation message

lib/helpers/conversations_helper.dart

@@ -101,7 +101,7 @@ class ConversationsHelper {
   Future<Conversation> _downloadSingle(int id) async {
     try {
       final response = await APIRequest(
-          uri: "conversations/getInfoOne",
+          uri: "conversations/get_single",
           needLogin: true,
           args: {"conversationID": id.toString()}).execWithThrow();
 
@@ -417,8 +417,32 @@ class ConversationsHelper {
     var serverMessage;
     if (map["server_message"] != null) {
       final srvMessageMap = map["server_message"];
+
+      var messageType;
+      switch (srvMessageMap["type"]) {
+        case "user_created_conv":
+          messageType = ConversationServerMessageType.USER_CREATED_CONVERSATION;
+          break;
+
+        case "user_added_another":
+          messageType = ConversationServerMessageType.USER_ADDED_ANOTHER_USER;
+          break;
+
+        case "user_left":
+          messageType = ConversationServerMessageType.USER_LEFT_CONV;
+          break;
+
+        case "user_removed_another":
+          messageType = ConversationServerMessageType.USER_REMOVED_ANOTHER_USER;
+          break;
+
+        default:
+          throw Exception(
+              "${srvMessageMap["type"]} is an unknown server message type!");
+      }
+
       serverMessage = ConversationServerMessage(
-        type: srvMessageMap["type"],
+        type: messageType,
         userID: srvMessageMap["user_id"],
         userWhoAdded: srvMessageMap["user_who_added"],
         userAdded: srvMessageMap["user_added"],

lib/helpers/serialization/conversation_message_serialization_helper.dart

@@ -8,8 +8,7 @@ import 'package:comunic/models/conversation_message.dart';
 ///
 /// @author Pierre Hubert
 
-final HashMap<int, ConversationsMessagesSerializationHelper> _instances =
-    HashSet() as HashMap<int, ConversationsMessagesSerializationHelper>;
+HashMap<int, ConversationsMessagesSerializationHelper> _instances;
 
 class ConversationsMessagesSerializationHelper
     extends BaseSerializationHelper<ConversationMessage> {
@@ -20,6 +19,8 @@ class ConversationsMessagesSerializationHelper
         assert(convID != null);
 
   factory ConversationsMessagesSerializationHelper(int convID) {
+    if (_instances == null) _instances = HashMap();
+
     if (!_instances.containsKey(convID))
       _instances[convID] = ConversationsMessagesSerializationHelper._(convID);
 

lib/lists/conversation_messages_list.dart

@@ -24,11 +24,10 @@ class ConversationMessagesList extends ListBase<ConversationMessage> {
   }
 
   /// Get the list of the users ID who own a message in this list
-  List<int> getUsersID() {
-    final List<int> users = List();
+  Set<int> getUsersID() {
+    final Set<int> users = Set();
 
-    for (ConversationMessage message in this)
-      if (!users.contains(message.userID)) users.add(message.userID);
+    for (ConversationMessage message in this) users.addAll(message.usersID);
 
     return users;
   }

lib/models/conversation_message.dart

@@ -1,6 +1,8 @@
 import 'package:comunic/helpers/serialization/base_serialization_helper.dart';
+import 'package:comunic/lists/users_list.dart';
 import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/utils/account_utils.dart' as account;
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:meta/meta.dart';
 
 /// Single conversation message
@@ -88,6 +90,33 @@ class ConversationServerMessage {
     throw Exception("Unsupported server message type!");
   }
 
+  String getText(UsersList list) {
+    switch (type) {
+      case ConversationServerMessageType.USER_CREATED_CONVERSATION:
+        return tr("%1% created the conversation",
+            args: {"1": list.getUser(userID).fullName});
+
+      case ConversationServerMessageType.USER_ADDED_ANOTHER_USER:
+        return tr("%1% added %2% to the conversation", args: {
+          "1": list.getUser(userWhoAdded).fullName,
+          "2": list.getUser(userAdded).fullName,
+        });
+
+      case ConversationServerMessageType.USER_LEFT_CONV:
+        return tr("%1% left the conversation", args: {
+          "1": list.getUser(userID).fullName,
+        });
+
+      case ConversationServerMessageType.USER_REMOVED_ANOTHER_USER:
+        return tr("%1% removed %2% from the conversation", args: {
+          "1": list.getUser(userWhoRemoved).fullName,
+          "2": list.getUser(userRemoved).fullName,
+        });
+    }
+
+    throw Exception("Unsupported message type!");
+  }
+
   Map<String, dynamic> toJson() => {
         "type": type.toString(),
         "userID": userID,
@@ -126,7 +155,7 @@ class ConversationMessage extends SerializableElement<ConversationMessage> {
     @required this.serverMessage,
   })  : assert(id != null),
         assert(convID != null),
-        assert(userID != null),
+        assert(userID != null || serverMessage != null),
         assert(timeSent != null),
         assert(message != null || file != null || serverMessage != null);
 
@@ -142,6 +171,8 @@ class ConversationMessage extends SerializableElement<ConversationMessage> {
 
   bool get isOwner => account.userID() == userID;
 
+  bool get isServerMessage => serverMessage != null;
+
   /// Get the list of the ID of the users implied in this message
   Set<int> get usersID {
     if (userID != null) return Set()..add(userID);
@@ -160,7 +191,7 @@ class ConversationMessage extends SerializableElement<ConversationMessage> {
       "convID": convID,
       "userID": userID,
       "timeSent": timeSent,
-      "message": message,
+      "message": message.content,
       "file": file?.toJson(),
       "serverMessage": serverMessage?.toJson(),
     };

lib/ui/screens/conversation_screen.dart

@@ -8,6 +8,7 @@ import 'package:comunic/lists/users_list.dart';
 import 'package:comunic/models/conversation_message.dart';
 import 'package:comunic/models/new_conversation_message.dart';
 import 'package:comunic/ui/tiles/conversation_message_tile.dart';
+import 'package:comunic/ui/tiles/server_conversation_message_tile.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
 import 'package:comunic/ui/widgets/scroll_watcher.dart';
 import 'package:comunic/utils/files_utils.dart';
@@ -134,7 +135,7 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
 
       await _applyNewMessages(messages);
     } catch (e, s) {
-      print("Failed to load messages! $e => $s");
+      debugPrint("Failed to load messages! $e => $s", wrapWidth: 4096);
       _errorLoading();
     }
   }
@@ -178,7 +179,7 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
 
     //Then get information about users
     final usersToGet =
-        findMissingFromList(_usersInfo.usersID, messages.getUsersID()).toSet();
+        findMissingFromSet(_usersInfo.usersID.toSet(), messages.getUsersID());
 
     final users = await _usersHelper.getList(usersToGet);
 
@@ -314,7 +315,12 @@ class _ConversationScreenState extends SafeState<ConversationScreen> {
           reverse: true,
           itemCount: _messages.length,
           itemBuilder: (c, i) {
-            return ConversationMessageTile(
+            return _messages[i].isServerMessage
+                ? ServerConversationMessageTile(
+                    message: _messages[i].serverMessage,
+                    users: _usersInfo,
+                  )
+                : ConversationMessageTile(
                     message: _messages.elementAt(i),
                     userInfo: _usersInfo.getUser(_messages[i].userID),
                     isLastMessage: _isLastMessage(i),

lib/ui/tiles/server_conversation_message_tile.dart

@@ -0,0 +1,33 @@
+import 'package:comunic/lists/users_list.dart';
+import 'package:comunic/models/conversation_message.dart';
+import 'package:flutter/material.dart';
+
+/// Server conversation message list
+///
+/// @author Pierre hubert
+
+class ServerConversationMessageTile extends StatelessWidget {
+  final ConversationServerMessage message;
+  final UsersList users;
+
+  const ServerConversationMessageTile({
+    Key key,
+    @required this.message,
+    @required this.users,
+  })  : assert(message != null),
+        assert(users != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Text(
+        message.getText(users),
+        style: TextStyle(
+          fontStyle: FontStyle.italic,
+          fontSize: 12,
+        ),
+      ),
+    );
+  }
+}

lib/utils/list_utils.dart

@@ -3,10 +3,10 @@
 /// @author Pierre HUBERT
 
 /// Transform a list of dynamic thins into something a list of ints
-List<int> listToIntList(List<dynamic> srcList){
+List<int> listToIntList(List<dynamic> srcList) {
   List<int> list = List();
 
-  srcList.forEach((e){
+  srcList.forEach((e) {
     list.add(int.parse(e));
   });
 
@@ -14,13 +14,22 @@ List<int> listToIntList(List<dynamic> srcList){
 }
 
 /// Find the list of missing elements of a [testList] from a [srcList]
-List<T> findMissingFromList<T>(List<T> srcList, List<T>testList) {
-
+List<T> findMissingFromList<T>(List<T> srcList, List<T> testList) {
   List<T> dest = List();
 
-  testList.forEach((f){
-    if(!srcList.contains(f) && !dest.contains(f))
-      dest.add(f);
+  testList.forEach((f) {
+    if (!srcList.contains(f) && !dest.contains(f)) dest.add(f);
+  });
+
+  return dest;
+}
+
+/// Find the list of missing elements of a [testList] from a [srcList]
+Set<T> findMissingFromSet<T>(Set<T> srcList, Set<T> testList) {
+  Set<T> dest = Set();
+
+  testList.forEach((f) {
+    if (!srcList.contains(f)) dest.add(f);
   });
 
   return dest;