import 'dart:convert';
import 'dart:io';

import 'package:path_provider/path_provider.dart';
import 'package:todo/buisness/ToDoItem.dart';
import 'package:todo/database/DatabaseInterface.dart';

class PathProvider implements DatabaseInterface {
  Future<String> get _localPath async {
    final directory = await getApplicationDocumentsDirectory();
    return directory.path;
  }
  Future<File> get _localFile async {
    final path = await _localPath;
    File file = File('$path/dataSeq.txt');
    if (!file.existsSync()) {
      file = await file.create();
      await file.writeAsString('[]');
    }
    return file;
  }

  @override
  Future<List<ToDoItem>> getToDoItems() async {
      final file = await _localFile;
      final contents = await file.readAsString();
      List<dynamic> contentJson = jsonDecode(contents);

      List<ToDoItem> toDoList = contentJson.map((item) => ToDoItem.fromMap(item)).toList();
      return toDoList;
  }

  @override
  Future<File> insertToDoItem(ToDoItem item) async {
    item.id = DateTime.now().millisecondsSinceEpoch;
    List<ToDoItem> l = await getToDoItems();
    l.add(item);
    final file = await _localFile;
    return file.writeAsString(jsonEncode(l.map((item) => item.toMap()).toList()));
  }

  @override
  Future<File> updateToDoItem(ToDoItem item) async {
    final file = await _localFile;
    return file.writeAsString(item.toMap() as String);
  }

  @override
  Future<File> deleteToDoItem(int id) async {
    final file = await _localFile;
    List<ToDoItem> l = await getToDoItems();
    l.remove(l.where((item) => item.id == id).first);
    return file.writeAsString(jsonEncode(l.map((item) => item.toMap()).toList()));
  }

}