import { create } from 'zustand';
import AsyncStorage from '@react-native-async-storage/async-storage';
import i18n from '../lib/i18n';

export type AppLanguage = 'de' | 'en';

const STORAGE_KEY = '@rebreak/language';

type LanguageState = {
  language: AppLanguage;
  setLanguage: (lang: AppLanguage) => Promise<void>;
  init: () => Promise<void>;
};

export const useLanguageStore = create<LanguageState>((set) => ({
  language: 'en',

  init: async () => {
    const stored = await AsyncStorage.getItem(STORAGE_KEY);
    const lang: AppLanguage = stored === 'de' || stored === 'en' ? stored : 'en';
    await i18n.changeLanguage(lang);
    set({ language: lang });
  },

  setLanguage: async (lang) => {
    await AsyncStorage.setItem(STORAGE_KEY, lang);
    await i18n.changeLanguage(lang);
    set({ language: lang });
  },
}));