import '../../../utils/ObjectConvertors.dart';
import 'GroupObjective.dart';

/// A goal the whole group shares, broken into objectives everyone logs
/// against. Like a personal goal it carries no debt of its own.
class GroupGoal {
  String id;

  String title;

  String description;

  DateTime? targetDate;

  String colourHex;

  List<GroupObjective> objectives;

  GroupGoal({
    this.id = "",
    this.title = "",
    this.description = "",
    this.targetDate,
    this.colourHex = "",
    List<GroupObjective>? objectives,
  }) : objectives = objectives ?? <GroupObjective>[];

  /// The average of the objectives, so one runaway objective cannot carry
  /// the rest.
  double get progress {
    if (objectives.isEmpty) {
      return 0;
    }
    double total = 0;
    for (GroupObjective objective in objectives) {
      total = total + objective.progress;
    }
    return total / objectives.length;
  }

  int get completeObjectives =>
      objectives.where((objective) => objective.complete).length;

  factory GroupGoal.fromJson(Map<String, dynamic> json) {
    return GroupGoal(
      id: json['id'] ?? "",
      title: json['title'] ?? "",
      description: json['description'] ?? "",
      targetDate: json['targetDate'] == null || json['targetDate'] == ""
          ? null
          : DateTime.tryParse(json['targetDate']),
      colourHex: json['colourHex'] ?? "",
      objectives: getGroupObjectiveList(json['objectives']),
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['title'] = title;
    data['description'] = description;
    data['targetDate'] = targetDate?.toIso8601String();
    data['colourHex'] = colourHex;
    data['objectives'] = objectives.map((item) => item.toJson()).toList();
    return data;
  }
}