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

/**
 * ==============================================================================
 * SAQEL TEACHER STUDIO - ASSIGNMENTS, Q&A & WEBSOCKET BROADCAST CUBIT
 * ==============================================================================
 * 
 * إدارة الواجبات المدرسية وغرفة استفسارات الطلبة والبث الفوري عبر الويب سوكت:
 * - محادثات حية ومباشرة مع الطلبة المسجلين
 * - تسجيل وإرسال الردود الصوتية السقراطية (Socratic Voice Replies 🎙️)
 * - بث مقاطع صوتية توجيهية لكافة طلبة الشعبة عبر الويب سوكت (0ms Broadcast).
 */

class TeacherQnAState {
  final List<TeacherHomeworkModel> homeworks;
  final List<StudentDoubtModel> doubts;
  final List<ChatConversationModel> conversations;
  final bool isLoading;
  final bool isBroadcasting;

  const TeacherQnAState({
    required this.homeworks,
    required this.doubts,
    required this.conversations,
    required this.isLoading,
    this.isBroadcasting = false,
  });

  TeacherQnAState copyWith({
    List<TeacherHomeworkModel>? homeworks,
    List<StudentDoubtModel>? doubts,
    List<ChatConversationModel>? conversations,
    bool? isLoading,
    bool? isBroadcasting,
  }) {
    return TeacherQnAState(
      homeworks: homeworks ?? this.homeworks,
      doubts: doubts ?? this.doubts,
      conversations: conversations ?? this.conversations,
      isLoading: isLoading ?? this.isLoading,
      isBroadcasting: isBroadcasting ?? this.isBroadcasting,
    );
  }
}

class TeacherQnACubit extends Cubit<TeacherQnAState> {
  final TeacherRepository repository;

  TeacherQnACubit({required this.repository})
      : super(const TeacherQnAState(
          homeworks: [],
          doubts: [],
          conversations: [],
          isLoading: false,
        ));

  Future<void> loadQnA() async {
    emit(state.copyWith(isLoading: true));
    try {
      final results = await Future.wait([
        repository.getHomeworks(),
        repository.getStudentDoubts(),
        repository.getConversations(),
      ]);
      emit(state.copyWith(
        homeworks: results[0] as List<TeacherHomeworkModel>,
        doubts: results[1] as List<StudentDoubtModel>,
        conversations: results[2] as List<ChatConversationModel>,
        isLoading: false,
      ));
    } catch (_) {
      emit(state.copyWith(isLoading: false));
    }
  }

  void dispatchNewHomework({
    required String title,
    required String className,
    required String dueDate,
  }) {
    throw StateError('إنشاء الواجبات ينتظر واجهة حفظ حقيقية على الخادم.');
  }

  Future<void> sendVoiceReply(String doubtId, {String? voiceText}) async {
    final targetIndex = state.doubts.indexWhere((doubt) => doubt.id == doubtId);
    if (targetIndex < 0 || state.doubts[targetIndex].studentId <= 0) {
      throw StateError('لا يوجد طالب حقيقي مرتبط بهذا الاستفسار.');
    }
    final target = state.doubts[targetIndex];
    final replyText = voiceText?.trim() ?? '';
    if (replyText.isEmpty) {
      throw StateError(
          'لا يمكن تسجيل رد صوتي دون ملف صوت حقيقي؛ أرسل رداً نصياً حالياً.');
    }
    await repository.sendMessage(
      receiverId: target.studentId,
      message: replyText,
      messageType: 'text',
    );
    final updated = state.doubts
        .map((doubt) => doubt.id == doubtId
            ? doubt.copyWith(replied: true, voiceReply: false)
            : doubt)
        .toList();
    emit(state.copyWith(doubts: updated));
  }

  Future<bool> broadcastAudioAnnouncement({
    required String title,
    required String explanationText,
    required String gradeLevel,
  }) async {
    emit(state.copyWith(isBroadcasting: true));
    final success = await repository.broadcastAnnouncement(
      title: title,
      message: explanationText,
      messageType: 'text',
      mediaUrl: null,
      gradeLevel: gradeLevel,
    );
    emit(state.copyWith(isBroadcasting: false));
    return success;
  }
}