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

import '../gradeAverages/gradeAveragesSettings.dart';
import '../talk/talkSettings.dart';
import '../timetable/timetableSettings.dart';
import 'settings.dart';

class SettingsProvider extends ChangeNotifier {
  static const String _fieldName = "settings";

  late SharedPreferences _storage;
  late Settings _settings = _defaults();

  Settings val({bool write = false}) {
    if(write) {
      notifyListeners();
      Future.delayed(const Duration(milliseconds: 300)).then((_) => update());
    }
    return _settings;
  }

  SettingsProvider() {
    init();
  }

  void init({bool resetConfig = false}) async {
    _storage = await SharedPreferences.getInstance();

    if(resetConfig) _storage.remove(_fieldName);

    try {
      _settings = Settings.fromJson(jsonDecode(_storage.getString(_fieldName)!));
    } catch(e) {
      log("Settings are defective, using defaults: ${e.toString()}");
      _settings = _defaults();
    }

    notifyListeners();
  }

  void update() async {
    await _storage.setString(_fieldName, jsonEncode(_settings.toJson()));
  }

  Settings _defaults() {
    return Settings(
      appTheme: ThemeMode.system,
      devToolsEnabled: false,
      gradeAveragesSettings: GradeAveragesSettings(
        useGradeSystem: true,
        inputs: []
      ),
      timetableSettings: TimetableSettings(
        zoom: 40,
      ),
      talkSettings: TalkSettings(
        sortFavoritesToTop: true,
        sortUnreadToTop: false,
      ),
    );
  }
}