/// One measurable part of a shared goal — "Run 100 km", "20 sessions" — that
/// every member logs toward.
class GroupObjective {
  String id;

  String title;

  /// km, sessions, pages, hours…
  String unit;

  double target;

  /// The group's total so far.
  double current;

  /// What the signed-in user has put in.
  double mine;

  GroupObjective({
    this.id = "",
    this.title = "",
    this.unit = "",
    this.target = 0,
    this.current = 0,
    this.mine = 0,
  });

  double get progress {
    if (target <= 0) {
      return 0;
    }
    return (current / target).clamp(0.0, 1.0);
  }

  bool get complete => target > 0 && current >= target;

  factory GroupObjective.fromJson(Map<String, dynamic> json) {
    return GroupObjective(
      id: json['id'] ?? "",
      title: json['title'] ?? "",
      unit: json['unit'] ?? "",
      target: (json['target'] ?? 0).toDouble(),
      current: (json['current'] ?? 0).toDouble(),
      mine: (json['mine'] ?? 0).toDouble(),
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['title'] = title;
    data['unit'] = unit;
    data['target'] = target;
    data['current'] = current;
    data['mine'] = mine;
    return data;
  }
}