saqel/apps/student_app/lib/data/models/lesson_model.dart

/// Real Lesson Model from /api/student/lessons
class LessonModel {
  final int id;
  final int courseId;
  final String title;
  final int sequenceOrder;
  final String storageType;
  final String? videoUuid;
  final String? hlsUrl;
  final String? thumbnailUrl;
  final String? aiVideoUrl;
  final int durationSeconds;
  final bool isFreePreview;
  final String courseTitle;
  final bool isAiVersion;
  final int? checkpointCount;

  LessonModel({
    required this.id,
    required this.courseId,
    required this.title,
    required this.sequenceOrder,
    required this.storageType,
    this.videoUuid,
    this.hlsUrl,
    this.thumbnailUrl,
    this.aiVideoUrl,
    required this.durationSeconds,
    required this.isFreePreview,
    required this.courseTitle,
    required this.isAiVersion,
    this.checkpointCount,
  });

  factory LessonModel.fromJson(Map<String, dynamic> json) {
    return LessonModel(
      id: json['id'] is int ? json['id'] : int.tryParse(json['id']?.toString() ?? '0') ?? 0,
      courseId: json['course_id'] is int ? json['course_id'] : int.tryParse(json['course_id']?.toString() ?? '0') ?? 0,
      title: json['title']?.toString() ?? 'درس تفاعلي',
      sequenceOrder: json['sequence_order'] is int ? json['sequence_order'] : int.tryParse(json['sequence_order']?.toString() ?? '1') ?? 1,
      storageType: json['storage_type']?.toString() ?? 'local',
      videoUuid: json['video_uuid']?.toString(),
      hlsUrl: json['hls_url']?.toString(),
      thumbnailUrl: json['thumbnail_url']?.toString(),
      aiVideoUrl: json['ai_video_url']?.toString(),
      durationSeconds: json['duration_seconds'] is int ? json['duration_seconds'] : int.tryParse(json['duration_seconds']?.toString() ?? '0') ?? 0,
      isFreePreview: json['is_free_preview'] == 1 || json['is_free_preview'] == true,
      courseTitle: json['course_title']?.toString() ?? 'المنهاج المعتمد',
      isAiVersion: json['is_ai_version'] == 1 || json['is_ai_version'] == true,
      checkpointCount: json['checkpoint_count'] is int ? json['checkpoint_count'] : int.tryParse(json['checkpoint_count']?.toString() ?? '0'),
    );
  }

  String get formattedDuration {
    if (durationSeconds <= 0) return 'درس تفاعلي';
    final minutes = durationSeconds ~/ 60;
    final seconds = durationSeconds % 60;
    return '$minutes دقيقة ${seconds > 0 ? '$seconds ثانية' : ''}';
  }
}

/// Real Child Profile & Academic Progress Model for Guardian
class GuardianChildModel {
  final int id;
  final String uuid;
  final String name;
  final String? nationalId;
  final String? gradeLevel;
  final String? stream;
  final String? schoolName;
  final double readinessScore;
  final int examsPassed;
  final int examsTotal;
  final int errorTotalCount;
  final int errorMasteredCount;
  final int errorPendingCount;
  final double errorMasteryRate;

  GuardianChildModel({
    required this.id,
    required this.uuid,
    required this.name,
    this.nationalId,
    this.gradeLevel,
    this.stream,
    this.schoolName,
    this.readinessScore = 0.0,
    this.examsPassed = 0,
    this.examsTotal = 0,
    this.errorTotalCount = 0,
    this.errorMasteredCount = 0,
    this.errorPendingCount = 0,
    this.errorMasteryRate = 100.0,
  });

  factory GuardianChildModel.fromJson(Map<String, dynamic> json) {
    final student = json['student'] is Map
        ? Map<String, dynamic>.from(json['student'])
        : <String, dynamic>{};
    final metrics = json['metrics'] is Map
        ? Map<String, dynamic>.from(json['metrics'])
        : <String, dynamic>{};
    final source = <String, dynamic>{...student, ...metrics, ...json};

    final errorNotebook = metrics['error_notebook'] is Map
        ? Map<String, dynamic>.from(metrics['error_notebook'])
        : <String, dynamic>{};
    final errTotal = errorNotebook['total_errors'] is int
        ? errorNotebook['total_errors'] as int
        : (source['errors_total'] is int
            ? source['errors_total'] as int
            : int.tryParse(errorNotebook['total_errors']?.toString() ?? source['errors_total']?.toString() ?? '0') ?? 0);
    final errMastered = errorNotebook['mastered_count'] is int
        ? errorNotebook['mastered_count'] as int
        : (source['errors_mastered'] is int
            ? source['errors_mastered'] as int
            : int.tryParse(errorNotebook['mastered_count']?.toString() ?? source['errors_mastered']?.toString() ?? '0') ?? 0);
    final errPending = errorNotebook['pending_count'] is int
        ? errorNotebook['pending_count'] as int
        : (source['errors_pending'] is int
            ? source['errors_pending'] as int
            : int.tryParse(errorNotebook['pending_count']?.toString() ?? source['errors_pending']?.toString() ?? '0') ?? 0);
    final errRate = errorNotebook['mastery_percentage'] != null
        ? double.tryParse(errorNotebook['mastery_percentage'].toString()) ?? 100.0
        : (source['errors_mastery_rate'] != null
            ? double.tryParse(source['errors_mastery_rate'].toString()) ?? 100.0
            : (errTotal > 0 ? (errMastered / errTotal) * 100 : 100.0));

    return GuardianChildModel(
      id: source['id'] is int ? source['id'] : int.tryParse(source['id']?.toString() ?? '0') ?? 0,
      uuid: source['uuid']?.toString() ?? '',
      name: source['full_name']?.toString() ?? source['name']?.toString() ?? 'الطالب',
      nationalId: source['national_id']?.toString(),
      gradeLevel: source['grade_level']?.toString(),
      stream: source['stream']?.toString(),
      schoolName: source['school_name']?.toString() ?? 'مدرسة معتمدة',
      readinessScore: source['readiness_score'] != null
          ? double.tryParse(source['readiness_score'].toString()) ?? 0.0
          : (source['tawjihi_readiness_score'] != null ? double.tryParse(source['tawjihi_readiness_score'].toString()) ?? 0.0 : 0.0),
      examsPassed: source['exams_passed_count'] is int ? source['exams_passed_count'] : int.tryParse(source['exams_passed_count']?.toString() ?? '0') ?? 0,
      examsTotal: source['exams_total_count'] is int ? source['exams_total_count'] : int.tryParse(source['exams_total_count']?.toString() ?? '0') ?? 0,
      errorTotalCount: errTotal,
      errorMasteredCount: errMastered,
      errorPendingCount: errPending,
      errorMasteryRate: errRate,
    );
  }
}