import 'package:flutter_bloc/flutter_bloc.dart';
import 'dart:typed_data';
import '../../data/models/teacher_models.dart';
import '../../data/repositories/teacher_repository.dart';

/**
 * ==============================================================================
 * SAQEL TEACHER STUDIO - STUDIO UPLOAD CUBIT
 * ==============================================================================
 * 
 * إدارة حالة استوديو رفع الحصص وفحص الجودة الإدراكي:
 * - التحقق من معيار معهد ماساتشوستس (20 - 25 دقيقة)
 * - استدعاء التدقيق الآلي للدرس ومخرجات المنهاج الوزاري.
 */

class TeacherStudioState {
  final String lessonTitle;
  final double durationMinutes;
  final String gradeLevel;
  final String? selectedFileName;
  final double? selectedFileSizeMb;
  final String? selectedFilePath;
  final Uint8List? selectedFileBytes;
  final bool isAuditing;
  final TeacherLessonAuditModel? auditResult;
  final bool isUploading;
  final bool isUploaded;
  final String? uploadSuccessMessage;

  const TeacherStudioState({
    required this.lessonTitle,
    required this.durationMinutes,
    this.gradeLevel = 'الصف العاشر الأساسي',
    this.selectedFileName,
    this.selectedFileSizeMb,
    this.selectedFilePath,
    this.selectedFileBytes,
    required this.isAuditing,
    this.auditResult,
    this.isUploading = false,
    this.isUploaded = false,
    this.uploadSuccessMessage,
  });

  TeacherStudioState copyWith({
    String? lessonTitle,
    double? durationMinutes,
    String? gradeLevel,
    String? selectedFileName,
    double? selectedFileSizeMb,
    String? selectedFilePath,
    Uint8List? selectedFileBytes,
    bool? isAuditing,
    TeacherLessonAuditModel? auditResult,
    bool? isUploading,
    bool? isUploaded,
    String? uploadSuccessMessage,
  }) {
    return TeacherStudioState(
      lessonTitle: lessonTitle ?? this.lessonTitle,
      durationMinutes: durationMinutes ?? this.durationMinutes,
      gradeLevel: gradeLevel ?? this.gradeLevel,
      selectedFileName: selectedFileName ?? this.selectedFileName,
      selectedFileSizeMb: selectedFileSizeMb ?? this.selectedFileSizeMb,
      selectedFilePath: selectedFilePath ?? this.selectedFilePath,
      selectedFileBytes: selectedFileBytes ?? this.selectedFileBytes,
      isAuditing: isAuditing ?? this.isAuditing,
      auditResult: auditResult ?? this.auditResult,
      isUploading: isUploading ?? this.isUploading,
      isUploaded: isUploaded ?? this.isUploaded,
      uploadSuccessMessage: uploadSuccessMessage ?? this.uploadSuccessMessage,
    );
  }
}

class TeacherStudioCubit extends Cubit<TeacherStudioState> {
  final TeacherRepository repository;

  TeacherStudioCubit({required this.repository})
      : super(const TeacherStudioState(
          lessonTitle: 'شرح قاعدة لنتز والحث الكهرومغناطيسي — فيزياء 2008',
          durationMinutes: 13.0,
          isAuditing: false,
          auditResult: null,
        ));

  void updateLessonTitle(String title) {
    emit(state.copyWith(lessonTitle: title));
  }

  void updateDuration(double duration) {
    emit(state.copyWith(durationMinutes: duration));
  }

  void updateGradeLevel(String grade) {
    emit(state.copyWith(gradeLevel: grade));
  }

  void selectVideoFile(
    String fileName,
    double sizeMb,
    double durationMinutes, {
    String? path,
    Uint8List? bytes,
  }) {
    emit(state.copyWith(
      selectedFileName: fileName,
      selectedFileSizeMb: sizeMb,
      selectedFilePath: path,
      selectedFileBytes: bytes,
      durationMinutes: durationMinutes,
      isUploaded: false,
      uploadSuccessMessage: null,
    ));
  }

  Future<void> runQualityGate() async {
    emit(state.copyWith(isAuditing: true));
    try {
      final result = await repository.auditStudioVideo(
        title: state.lessonTitle,
        durationMinutes: state.durationMinutes,
        subject: 'الفيزياء',
      );
      emit(state.copyWith(
        isAuditing: false,
        auditResult: result,
      ));
    } catch (_) {
      emit(state.copyWith(isAuditing: false));
    }
  }

  Future<bool> uploadAndPublishLesson() async {
    if (state.selectedFileName == null ||
        (state.selectedFilePath == null && state.selectedFileBytes == null)) {
      return false;
    }
    emit(state.copyWith(isUploading: true));
    try {
      final res = await repository.uploadLesson(
        title: state.lessonTitle,
        durationMinutes: state.durationMinutes,
        gradeLevel: state.gradeLevel,
        subject: 'الفيزياء والعلوم التطبيقية',
        fileName: state.selectedFileName ?? 'lentz_law_physics_2008.mp4',
        fileSizeMb: state.selectedFileSizeMb ?? 48.2,
        filePath: state.selectedFilePath,
        fileBytes: state.selectedFileBytes,
      );

      final msg = res['message']?.toString() ?? 'تم رفع ونشر الحصة بنجاح في المنهاج الوزاري وسوق صَقِل! 🚀';
      emit(state.copyWith(
        isUploading: false,
        isUploaded: true,
        uploadSuccessMessage: msg,
      ));
      return true;
    } catch (e) {
      emit(state.copyWith(isUploading: false));
      return false;
    }
  }
}