todo_app/lib/features/todo/presentation/providers/todo_providers.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../data/repositories/in_memory_todo_repository.dart';
import '../../domain/entities/todo.dart';
import '../../domain/entities/create_todo_params.dart';
import '../../domain/entities/update_todo_params.dart';
import '../../domain/repositories/todo_repository.dart';

final todoRepositoryProvider = Provider<TodoRepository>((ref) {
  return InMemoryTodoRepository();
});

final todoListProvider =
    AsyncNotifierProvider<TodoListNotifier, List<Todo>>(
  TodoListNotifier.new,
);

final todoDetailProvider =
    FutureProvider.family<Todo, String>((ref, id) {
  return ref.watch(todoRepositoryProvider).getTodo(id);
});

final todoFilterProvider = StateProvider<TodoFilter>((ref) {
  return const TodoFilter();
});

class TodoFilter {
  final String? priority;
  final bool? completed;

  const TodoFilter({this.priority, this.completed});

  TodoFilter copyWith({String? priority, bool? completed, bool clearPriority = false, bool clearCompleted = false}) {
    return TodoFilter(
      priority: clearPriority ? null : (priority ?? this.priority),
      completed: clearCompleted ? null : (completed ?? this.completed),
    );
  }
}

class TodoListNotifier extends AsyncNotifier<List<Todo>> {
  @override
  Future<List<Todo>> build() async {
    final repository = ref.watch(todoRepositoryProvider);
    final filter = ref.watch(todoFilterProvider);
    return repository.getTodos(
      priorityFilter: filter.priority,
      completedFilter: filter.completed,
    );
  }

  Future<void> createTodo(CreateTodoParams params) async {
    final repository = ref.read(todoRepositoryProvider);
    await repository.createTodo(params);
    ref.invalidateSelf();
  }

  Future<void> updateTodo(String id, UpdateTodoParams params) async {
    final repository = ref.read(todoRepositoryProvider);
    await repository.updateTodo(id, params);
    ref.invalidateSelf();
  }

  Future<void> deleteTodo(String id) async {
    final repository = ref.read(todoRepositoryProvider);
    await repository.deleteTodo(id);
    ref.invalidateSelf();
  }

  Future<void> toggleTodo(String id) async {
    final repository = ref.read(todoRepositoryProvider);
    await repository.toggleTodo(id);
    ref.invalidateSelf();
  }

  Future<void> reorderTodos(int oldIndex, int newIndex) async {
    final repository = ref.read(todoRepositoryProvider);
    await repository.reorderTodos(oldIndex, newIndex);
    ref.invalidateSelf();
  }

  void setFilter(TodoFilter filter) {
    ref.read(todoFilterProvider.notifier).state = filter;
    ref.invalidateSelf();
  }
}