AppFlowy/frontend/app_flowy/lib/workspace/application/appearance.dart

import 'dart:async';

import 'package:app_flowy/user/application/user_settings_service.dart';
import 'package:equatable/equatable.dart';
import 'package:flowy_infra/theme.dart';
import 'package:flowy_sdk/log.dart';
import 'package:flowy_sdk/protobuf/flowy-user/user_setting.pb.dart';
import 'package:flutter/material.dart';
import 'package:easy_localization/easy_localization.dart';

class AppearanceSettingModel extends ChangeNotifier with EquatableMixin {
  AppearanceSettingsPB setting;
  AppTheme _theme;
  Locale _locale;
  Timer? _saveOperation;

  AppearanceSettingModel(this.setting)
      : _theme = AppTheme.fromName(name: setting.theme),
        _locale =
            Locale(setting.locale.languageCode, setting.locale.countryCode);

  AppTheme get theme => _theme;
  Locale get locale => _locale;

  Future<void> save() async {
    _saveOperation?.cancel();
    _saveOperation = Timer(const Duration(seconds: 2), () async {
      await UserSettingsService().setAppearanceSettings(setting);
    });
  }

  @override
  List<Object> get props {
    return [setting.hashCode];
  }

  void swapTheme() {
    final themeType =
        (_theme.ty == ThemeType.light ? ThemeType.dark : ThemeType.light);

    if (_theme.ty != themeType) {
      _theme = AppTheme.fromType(themeType);
      setting.theme = themeTypeToString(themeType);
      notifyListeners();
      save();
    }
  }

  void setLocale(BuildContext context, Locale newLocale) {
    if (!context.supportedLocales.contains(newLocale)) {
      Log.warn("Unsupported locale: $newLocale");
      newLocale = const Locale('en');
      Log.debug("Fallback to locale: $newLocale");
    }

    context.setLocale(newLocale);

    if (_locale != newLocale) {
      _locale = newLocale;
      setting.locale.languageCode = _locale.languageCode;
      setting.locale.countryCode = _locale.countryCode ?? "";
      notifyListeners();
      save();
    }
  }

  void readLocaleWhenAppLaunch(BuildContext context) {
    if (setting.resetAsDefault) {
      setting.resetAsDefault = false;
      save();

      setLocale(context, context.deviceLocale);
      return;
    }

    // when opening app the first time
    setLocale(context, _locale);
  }
}