import '../../../utils/ObjectConvertors.dart';
import 'GroupGoal.dart';
import 'GroupMember.dart';

/// People keeping each other honest: members, the goals they share, and the
/// chat they talk in.
class Group {
  String id;

  String name;

  String description;

  String colourHex;

  /// Six characters a friend types to join.
  String inviteCode;

  List<GroupMember> members;

  List<GroupGoal> goals;

  /// Messages the signed-in user has not seen yet.
  int unread;

  String lastMessage;

  String lastAuthor;

  DateTime? lastMessageAt;

  Group({
    this.id = "",
    this.name = "",
    this.description = "",
    this.colourHex = "",
    this.inviteCode = "",
    List<GroupMember>? members,
    List<GroupGoal>? goals,
    this.unread = 0,
    this.lastMessage = "",
    this.lastAuthor = "",
    this.lastMessageAt,
  })  : members = members ?? <GroupMember>[],
        goals = goals ?? <GroupGoal>[];

  /// Average progress across the shared goals.
  double get progress {
    if (goals.isEmpty) {
      return 0;
    }
    double total = 0;
    for (GroupGoal goal in goals) {
      total = total + goal.progress;
    }
    return total / goals.length;
  }

  bool get iOwn => members.any((member) => member.me && member.owner);

  factory Group.fromJson(Map<String, dynamic> json) {
    return Group(
      id: json['id'] ?? "",
      name: json['name'] ?? "",
      description: json['description'] ?? "",
      colourHex: json['colourHex'] ?? "",
      inviteCode: json['inviteCode'] ?? "",
      members: getGroupMemberList(json['members']),
      goals: getGroupGoalList(json['goals']),
      unread: json['unread'] ?? 0,
      lastMessage: json['lastMessage'] ?? "",
      lastAuthor: json['lastAuthor'] ?? "",
      lastMessageAt: json['lastMessageAt'] == null
          ? null
          : DateTime.tryParse(json['lastMessageAt']),
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['name'] = name;
    data['description'] = description;
    data['colourHex'] = colourHex;
    data['inviteCode'] = inviteCode;
    data['members'] = members.map((item) => item.toJson()).toList();
    data['goals'] = goals.map((item) => item.toJson()).toList();
    data['unread'] = unread;
    data['lastMessage'] = lastMessage;
    data['lastAuthor'] = lastAuthor;
    data['lastMessageAt'] = lastMessageAt?.toIso8601String();
    return data;
  }
}