import 'package:flutter/foundation.dart';
import '../models/todo.dart';
import '../storage/todo_storage.dart';

class ToDoProvider with ChangeNotifier {
  List<ToDo> _todos = [];
  final ToDoStorage storage;

  ToDoProvider(this.storage) {
    loadTasks();
  }

  List<ToDo> get todos => _todos;

  void addTask(ToDo todo) {
    _todos.add(todo);
    storage.addTask(todo);
    notifyListeners();
  }

  void removeTask(int index) {
    storage.removeTask(index);
    _todos.removeAt(index);
    notifyListeners();
  }

  void toggleCompletion(int index) {
    _todos[index].isCompleted = !_todos[index].isCompleted;
    storage.updateTask(index, _todos[index]);
    notifyListeners();
  }

  Future<void> loadTasks() async {
    _todos = await storage.fetchTasks();
    notifyListeners();
  }

  void sortByDeadline() {
    _todos.sort((a, b) => a.deadline.compareTo(b.deadline));
    notifyListeners();
  }

  void sortByPriority() {
    Map<String, int> priorityMap = {'High': 1, 'Medium': 2, 'Low': 3};
    _todos.sort((a, b) => priorityMap[a.priority]!.compareTo(priorityMap[b.priority]!));
    notifyListeners();
  }

  void sortByStatus() {
    _todos.sort((a, b) => a.isCompleted ? 1 : -1);
    notifyListeners();
  }
}