/// A recurring excuse plus the pattern the app confronts you with, e.g.
/// "Too tired has appeared 14 times this month, 11 of them on gym days,
/// 9 of them after 7pm. Consider moving gym to morning."
class ExcuseCluster {
  String? id;

  String label;

  int occurrences;

  /// Weekday histogram (1 = Monday) — where this excuse concentrates.
  Map<int, int> byWeekday;

  /// Hour-of-day histogram — when it concentrates.
  Map<int, int> byHour;

  /// The category this excuse most often attaches to.
  String dominantCategory;

  /// The confrontation copy rendered to the user.
  String insight;

  ExcuseCluster({
    this.id,
    this.label = "",
    this.occurrences = 0,
    Map<int, int>? byWeekday,
    Map<int, int>? byHour,
    this.dominantCategory = "",
    this.insight = "",
  })  : byWeekday = byWeekday ?? <int, int>{},
        byHour = byHour ?? <int, int>{};

  factory ExcuseCluster.fromJson(Map<String, dynamic> json) {
    final Map<int, int> weekdays = <int, int>{};
    if (json['byWeekday'] != null) {
      (json['byWeekday'] as Map<String, dynamic>).forEach((key, value) {
        weekdays[int.tryParse(key) ?? 1] = value ?? 0;
      });
    }

    final Map<int, int> hours = <int, int>{};
    if (json['byHour'] != null) {
      (json['byHour'] as Map<String, dynamic>).forEach((key, value) {
        hours[int.tryParse(key) ?? 0] = value ?? 0;
      });
    }

    return ExcuseCluster(
      id: json['id'],
      label: json['label'] ?? "",
      occurrences: json['occurrences'] ?? 0,
      byWeekday: weekdays,
      byHour: hours,
      dominantCategory: json['dominantCategory'] ?? "",
      insight: json['insight'] ?? "",
    );
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = <String, dynamic>{};
    data['id'] = id;
    data['label'] = label;
    data['occurrences'] = occurrences;
    data['byWeekday'] =
        byWeekday.map((key, value) => MapEntry(key.toString(), value));
    data['byHour'] = byHour.map((key, value) => MapEntry(key.toString(), value));
    data['dominantCategory'] = dominantCategory;
    data['insight'] = insight;
    return data;
  }
}