import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:convert';
import 'ToDoItem.dart';

class ToDoProvider with ChangeNotifier {
  List<ToDoItem> _toDoList = [];

  List<ToDoItem> get toDoList => _toDoList;

  ToDoProvider() {
    _loadFromPrefs();
  }

  void addToDo(ToDoItem item) {
    _toDoList.add(item);
    _saveToPrefs();
    notifyListeners();
  }

  void updateStatus(int index, String status) {
    _toDoList[index].status = status;
    _saveToPrefs();
    notifyListeners();
  }

  // Save To-Do list to shared preferences as JSON
  Future<void> _saveToPrefs() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<Map<String, dynamic>> jsonData = _toDoList.map((item) => item.toJson()).toList();
    await prefs.setString('toDoList', json.encode(jsonData));
  }

// Load To-Do list from shared preferences as JSON
  Future<void> _loadFromPrefs() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String? toDoData = prefs.getString('toDoList');
    if (toDoData != null) {
      List<dynamic> jsonData = json.decode(toDoData);
      _toDoList = jsonData.map((item) => ToDoItem.fromJson(item)).toList();
    }
    notifyListeners();
  }
  void sortByName() {
    _toDoList.sort((a, b) => a.name.compareTo(b.name));
    notifyListeners();
  }

  void sortByDueDate() {
    _toDoList.sort((a, b) => a.dueDate.compareTo(b.dueDate));
    notifyListeners();
  }

  void sortByStatus() {
    _toDoList.sort((a, b) => a.status.compareTo(b.status));
    notifyListeners();
  }

}