comunicmobile/lib/models/conversation_message.dart

import 'package:comunic/helpers/serialization/base_serialization_helper.dart';
import 'package:comunic/models/displayed_content.dart';
import 'package:comunic/utils/account_utils.dart' as account;
import 'package:meta/meta.dart';

/// Single conversation message
///
/// @author Pierre HUBERT

class ConversationMessageFile {
  final String url;
  final int size;
  final String name;
  final String thumbnail;
  final String type;

  const ConversationMessageFile({
    @required this.url,
    @required this.size,
    @required this.name,
    @required this.thumbnail,
    @required this.type,
  })  : assert(url != null),
        assert(size != null),
        assert(name != null),
        assert(type != null);

  Map<String, dynamic> toJson() => {
        "url": url,
        "size": size,
        "name": name,
        "thumbnail": thumbnail,
        "type": type
      };

  ConversationMessageFile.fromJson(Map<String, dynamic> json)
      : url = json["url"],
        size = json["size"],
        name = json["name"],
        thumbnail = json["thumbnail"],
        type = json["type"];
}

enum ConversationServerMessageType {
  USER_CREATED_CONVERSATION,
  USER_ADDED_ANOTHER_USER,
  USER_LEFT_CONV,
  USER_REMOVED_ANOTHER_USER
}

class ConversationServerMessage {
  final ConversationServerMessageType type;
  final int userID;
  final int userWhoAdded;
  final int userAdded;
  final int userWhoRemoved;
  final int userRemoved;

  const ConversationServerMessage({
    @required this.type,
    @required this.userID,
    @required this.userWhoAdded,
    @required this.userAdded,
    @required this.userWhoRemoved,
    @required this.userRemoved,
  })  : assert(type != null),
        assert(userID != null ||
            (type != ConversationServerMessageType.USER_CREATED_CONVERSATION &&
                type != ConversationServerMessageType.USER_LEFT_CONV)),
        assert((userWhoAdded != null && userAdded != null) ||
            type != ConversationServerMessageType.USER_ADDED_ANOTHER_USER),
        assert((userWhoRemoved != null && userRemoved != null) ||
            type != ConversationServerMessageType.USER_REMOVED_ANOTHER_USER);

  Set<int> get usersID {
    switch (type) {
      case ConversationServerMessageType.USER_CREATED_CONVERSATION:
      case ConversationServerMessageType.USER_LEFT_CONV:
        return Set()..add(userID);

      case ConversationServerMessageType.USER_ADDED_ANOTHER_USER:
        return Set()..add(userWhoAdded)..add(userAdded);

      case ConversationServerMessageType.USER_REMOVED_ANOTHER_USER:
        return Set()..add(userWhoRemoved)..add(userRemoved);
    }

    throw Exception("Unsupported server message type!");
  }

  Map<String, dynamic> toJson() => {
        "type": type.toString(),
        "userID": userID,
        "userWhoAdded": userWhoAdded,
        "userAdded": userAdded,
        "userWhoRemoved": userWhoRemoved,
        "userRemoved": userRemoved,
      };

  ConversationServerMessage.fromJson(Map<String, dynamic> json)
      : type = ConversationServerMessageType.values
            .firstWhere((el) => el.toString() == json["type"]),
        userID = json["userID"],
        userWhoAdded = json["userWhoAdded"],
        userAdded = json["userAdded"],
        userWhoRemoved = json["userWhoRemoved"],
        userRemoved = json["userRemoved"];
}

class ConversationMessage extends SerializableElement<ConversationMessage> {
  final int id;
  final int convID;
  final int userID;
  final int timeSent;
  final DisplayedString message;
  final ConversationMessageFile file;
  final ConversationServerMessage serverMessage;

  ConversationMessage({
    @required this.id,
    @required this.convID,
    @required this.userID,
    @required this.timeSent,
    @required this.message,
    @required this.file,
    @required this.serverMessage,
  })  : assert(id != null),
        assert(convID != null),
        assert(userID != null),
        assert(timeSent != null),
        assert(message != null || file != null || serverMessage != null);

  DateTime get date => DateTime.fromMillisecondsSinceEpoch(timeSent * 1000);

  bool get hasMessage => !message.isNull && message.length > 0;

  bool get hasFile => file != null;

  bool get hasThumbnail => hasFile && file.thumbnail != null;

  bool get hasImage => hasFile && file.type.startsWith("image/");

  bool get isOwner => account.userID() == userID;

  /// Get the list of the ID of the users implied in this message
  Set<int> get usersID {
    if (userID != null) return Set()..add(userID);

    return serverMessage.usersID;
  }

  @override
  int compareTo(ConversationMessage other) {
    return id.compareTo(other.id);
  }

  Map<String, dynamic> toJson() {
    return {
      "id": id,
      "convID": convID,
      "userID": userID,
      "timeSent": timeSent,
      "message": message,
      "file": file?.toJson(),
      "serverMessage": serverMessage?.toJson(),
    };
  }

  ConversationMessage.fromJson(Map<String, dynamic> map)
      : id = map["id"],
        convID = map["convID"],
        userID = map["userID"],
        timeSent = map["timeSent"],
        message = DisplayedString(map["message"]),
        file = map["file"],
        serverMessage = map["serverMessage"];
}