import 'dart:async';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../domain/entities/setup_models.dart';
import '../../domain/repositories/setup_repository.dart';
import 'auth_provider.dart';

final setupRepositoryProvider = Provider<SetupRepository>((ref) {
  return SetupRepository();
});

final academicYearsListProvider = FutureProvider<List<AcademicYearModel>>((
  ref,
) async {
  final repo = ref.read(setupRepositoryProvider);
  return repo.getAcademicYears();
});

final sectionsListProvider = FutureProvider<List<SectionModel>>((ref) async {
  final repo = ref.read(setupRepositoryProvider);
  final user = ref.watch(authProvider).value;

  if (user?.role == 'teacher') {
    return repo.getTeacherSections(user!.id);
  }

  return repo.getAllSections();
});

final gradeLevelsListProvider = FutureProvider<List<GradeLevelModel>>((
  ref,
) async {
  final repo = ref.read(setupRepositoryProvider);
  return repo.getGradeLevels();
});

final teacherSectionsProvider = FutureProvider.family<List<SectionModel>, int>((
  ref,
  teacherId,
) async {
  final repo = ref.read(setupRepositoryProvider);
  return repo.getTeacherSections(teacherId);
});

// Setup mutation notifier for CRUD setup actions
final setupMutationProvider =
    AsyncNotifierProvider<SetupMutationNotifier, void>(
      SetupMutationNotifier.new,
    );

class SetupMutationNotifier extends AsyncNotifier<void> {
  @override
  FutureOr<void> build() {}

  // Academic Years
  Future<void> createAcademicYear({
    required String yearRange,
    required String status,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.createAcademicYear(yearRange: yearRange, status: status);
      state = const AsyncData(null);
      ref.invalidate(academicYearsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> updateAcademicYear({
    required int id,
    required String yearRange,
    required String status,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.updateAcademicYear(
        id: id,
        yearRange: yearRange,
        status: status,
      );
      state = const AsyncData(null);
      ref.invalidate(academicYearsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> deleteAcademicYear(int id) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.deleteAcademicYear(id);
      state = const AsyncData(null);
      ref.invalidate(academicYearsListProvider);
      // Cascades delete sections
      ref.invalidate(sectionsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  // Sections
  Future<void> createSection({
    required String name,
    required int gradeLevel,
    required int academicYearId,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.createSection(
        name: name,
        gradeLevel: gradeLevel,
        academicYearId: academicYearId,
      );
      state = const AsyncData(null);
      ref.invalidate(sectionsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> updateSection({
    required int id,
    required String name,
    required int gradeLevel,
    required int academicYearId,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.updateSection(
        id: id,
        name: name,
        gradeLevel: gradeLevel,
        academicYearId: academicYearId,
      );
      state = const AsyncData(null);
      ref.invalidate(sectionsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> deleteSection(int id) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.deleteSection(id);
      state = const AsyncData(null);
      ref.invalidate(sectionsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  // Grade Levels
  Future<void> createGradeLevel({
    required int level,
    required String name,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.createGradeLevel(level: level, name: name);
      state = const AsyncData(null);
      ref.invalidate(gradeLevelsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> updateGradeLevel({
    required int id,
    required int level,
    required String name,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.updateGradeLevel(id: id, level: level, name: name);
      state = const AsyncData(null);
      ref.invalidate(gradeLevelsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  Future<void> deleteGradeLevel(int id) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.deleteGradeLevel(id);
      state = const AsyncData(null);
      ref.invalidate(gradeLevelsListProvider);
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }

  // Teacher Sections Assignment
  Future<void> updateTeacherSections({
    required int teacherId,
    required List<int> sectionIds,
  }) async {
    state = const AsyncLoading();
    try {
      final repo = ref.read(setupRepositoryProvider);
      await repo.updateTeacherSections(
        teacherId: teacherId,
        sectionIds: sectionIds,
      );
      state = const AsyncData(null);
      ref.invalidate(teacherSectionsProvider(teacherId));
    } catch (e, st) {
      state = AsyncError(e, st);
      rethrow;
    }
  }
}