processRoomDocument function

Future<Room> processRoomDocument(DocumentSnapshot<Map<String, dynamic>> doc, User firebaseUser, FirebaseFirestore instance, String usersCollectionName,)

Returns a types.Room created from Firebase document.

Implementation

Future<types.Room> processRoomDocument(
  DocumentSnapshot<Map<String, dynamic>> doc,
  User firebaseUser,
  FirebaseFirestore instance,
  String usersCollectionName,
) async {
  final data = doc.data()!;

  data['createdAt'] = data['createdAt']?.millisecondsSinceEpoch;
  data['id'] = doc.id;
  data['updatedAt'] = data['updatedAt']?.millisecondsSinceEpoch;

  var imageUrl = data['imageUrl'] as String?;
  var name = data['name'] as String?;
  final type = data['type'] as String;
  final userIds = data['userIds'] as List<dynamic>;
  final userRoles = data['userRoles'] as Map<String, dynamic>?;

  final users = await Future.wait(
    userIds.map(
      (userId) => fetchUser(
        instance,
        userId as String,
        usersCollectionName,
        role: userRoles?[userId] as String?,
      ),
    ),
  );

  if (type == types.RoomType.direct.toShortString()) {
    try {
      final otherUser = users.firstWhere(
        (u) => u['id'] != firebaseUser.uid,
      );

      imageUrl = otherUser['imageUrl'] as String?;
      name = '${otherUser['firstName'] ?? ''} ${otherUser['lastName'] ?? ''}'
          .trim();
    } catch (e) {
      // Do nothing if other user is not found, because he should be found.
      // Consider falling back to some default values.
    }
  }

  data['imageUrl'] = imageUrl;
  data['name'] = name;
  data['users'] = users;

  if (data['lastMessages'] != null) {
    final lastMessages = data['lastMessages'].map((lm) {
      final author = users.firstWhere(
        (u) => u['id'] == lm['authorId'],
        orElse: () => {'id': lm['authorId'] as String},
      );

      lm['author'] = author;
      lm['createdAt'] = lm['createdAt']?.millisecondsSinceEpoch;
      lm['id'] = lm['id'] ?? '';
      lm['updatedAt'] = lm['updatedAt']?.millisecondsSinceEpoch;

      return lm;
    }).toList();

    data['lastMessages'] = lastMessages;
  }

  return types.Room.fromJson(data);
}