class TrainingPlan {
  const TrainingPlan({
    required this.uuid,
    required this.slug,
    required this.title,
    required this.summary,
    required this.goal,
    required this.level,
    required this.weeksDuration,
    required this.safetyNotes,
    required this.sessions,
  });

  final String uuid;
  final String slug;
  final String title;
  final String summary;
  final String goal;
  final String level;
  final int weeksDuration;
  final List<String> safetyNotes;
  final List<TrainingSession> sessions;

  factory TrainingPlan.fromJson(Map<String, dynamic> json) => TrainingPlan(
        uuid: json['plan_uuid'] as String? ?? '',
        slug: json['slug'] as String? ?? '',
        title: json['title_ar'] as String? ?? 'خطة تدريب',
        summary: json['summary_ar'] as String? ?? '',
        goal: json['goal'] as String? ?? '',
        level: json['level'] as String? ?? 'beginner',
        weeksDuration: _asInt(json['weeks_duration']),
        safetyNotes: _stringList(json['safety_notes_ar']),
        sessions: _mapList(json['sessions'])
            .map(TrainingSession.fromJson)
            .toList(growable: false),
      );
}

class TrainingSession {
  const TrainingSession({
    required this.week,
    required this.day,
    required this.title,
    required this.type,
    required this.durationMinutes,
    required this.intensity,
    required this.notes,
    required this.exercises,
  });

  final int week;
  final int day;
  final String title;
  final String type;
  final int durationMinutes;
  final String intensity;
  final String? notes;
  final List<TrainingExercise> exercises;

  factory TrainingSession.fromJson(Map<String, dynamic> json) =>
      TrainingSession(
        week: _asInt(json['week']),
        day: _asInt(json['day']),
        title: json['title_ar'] as String? ?? 'جلسة تدريب',
        type: json['type'] as String? ?? 'rest',
        durationMinutes: _asInt(json['duration_minutes']),
        intensity: json['intensity'] as String? ?? 'easy',
        notes: json['notes_ar'] as String?,
        exercises: _mapList(json['exercises'])
            .map(TrainingExercise.fromJson)
            .toList(growable: false),
      );
}

class TrainingExercise {
  const TrainingExercise({
    required this.uuid,
    required this.slug,
    required this.title,
    required this.instructions,
    required this.targetMuscles,
    required this.equipment,
    required this.gifUrl,
    required this.posterUrl,
    required this.durationSeconds,
    required this.repetitions,
    required this.safetyNotes,
    required this.alternativeUuid,
    required this.prescription,
  });

  final String uuid;
  final String slug;
  final String title;
  final List<String> instructions;
  final List<String> targetMuscles;
  final List<String> equipment;
  final String? gifUrl;
  final String? posterUrl;
  final int? durationSeconds;
  final String? repetitions;
  final List<String> safetyNotes;
  final String? alternativeUuid;
  final ExercisePrescription prescription;

  factory TrainingExercise.fromJson(Map<String, dynamic> json) {
    final prescription = json['prescription'];
    final prescriptionMap = prescription is Map<String, dynamic>
        ? prescription
        : const <String, dynamic>{};
    return TrainingExercise(
      uuid: json['exercise_uuid'] as String? ?? '',
      slug: json['slug'] as String? ?? '',
      title: json['title_ar'] as String? ?? 'تمرين',
      instructions: _stringList(json['instructions_ar']),
      targetMuscles: _stringList(json['target_muscles']),
      equipment: _stringList(json['equipment']),
      gifUrl: json['gif_url'] as String?,
      posterUrl: json['gif_poster_url'] as String?,
      durationSeconds: _nullableInt(json['duration_seconds']),
      repetitions: json['repetitions'] as String?,
      safetyNotes: _stringList(json['safety_notes_ar']),
      alternativeUuid: json['alternative_exercise_uuid'] as String?,
      prescription: ExercisePrescription.fromJson(prescriptionMap),
    );
  }
}

class ExercisePrescription {
  const ExercisePrescription({
    this.sets,
    this.reps,
    this.durationSeconds,
    this.restSeconds = 0,
  });

  final int? sets;
  final String? reps;
  final int? durationSeconds;
  final int restSeconds;

  factory ExercisePrescription.fromJson(Map<String, dynamic> json) =>
      ExercisePrescription(
        sets: _nullableInt(json['sets']),
        reps: json['reps'] as String?,
        durationSeconds: _nullableInt(json['duration_seconds']),
        restSeconds: _asInt(json['rest_seconds']),
      );
}

class TrainingCatalogResult {
  const TrainingCatalogResult({
    required this.plans,
    required this.fromCache,
    this.message,
  });

  final List<TrainingPlan> plans;
  final bool fromCache;
  final String? message;
}

List<Map<String, dynamic>> _mapList(dynamic value) {
  if (value is! List) return const [];
  return value.whereType<Map<String, dynamic>>().toList(growable: false);
}

List<String> _stringList(dynamic value) {
  if (value is! List) return const [];
  return value.whereType<String>().toList(growable: false);
}

int _asInt(dynamic value) => value is num ? value.toInt() : 0;

int? _nullableInt(dynamic value) => value is num ? value.toInt() : null;