import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:shared_preferences/shared_preferences.dart';

class LocaleNotifier extends StateNotifier<Locale> {
  LocaleNotifier() : super(const Locale('en')) {
    _loadSavedLocale();
  }

  static const _storageKey = 'preferred_language';

  Future<void> _loadSavedLocale() async {
    final prefs = await SharedPreferences.getInstance();
    final code = prefs.getString(_storageKey);
    if (code == 'ar' || code == 'en') {
      state = Locale(code!);
    }
  }

  Future<void> _persistLocale(String languageCode) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_storageKey, languageCode);
  }

  Future<void> toggle() async {
    final nextCode = state.languageCode == 'en' ? 'ar' : 'en';
    state = Locale(nextCode);
    await _persistLocale(nextCode);
  }

  Future<void> toggleLocale() => toggle();

  Future<void> setLocale(Locale locale) async {
    state = locale;
    await _persistLocale(locale.languageCode);
  }
}

final localeProvider = StateNotifierProvider<LocaleNotifier, Locale>(
  (ref) => LocaleNotifier(),
);