/*
 This file is part of GNU Taler
 (C) 2021 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 *
 * @author Sebastian Javier Marchano (sebasjm)
 */

import { createContext, h, VNode } from 'preact';
import { useContext, useEffect } from 'preact/hooks';
import { useLang } from '../hooks';
import * as jedLib from 'jed';
import { strings } from '../i18n/strings';

interface Type {
  lang: string;
  handler: any;
  changeLanguage: (l: string) => void;
}
const initial = {
  lang: 'en',
  handler: null,
  changeLanguage: () => {
    /**
     * This function will be replaced by one with
     * the same signature _but_ coming from the state.
     * FIXME: clarify this design.
     */
  },
};
const Context = createContext<Type>(initial);

interface Props {
  initial?: string;
  children: any;
  forceLang?: string;
}

// Outmost UI wrapper.
export const TranslationProvider = ({
  initial,
  children,
  forceLang,
}: Props): VNode => {

  const [lang, changeLanguage] = useLang(initial);
  useEffect(() => {
    if (forceLang) 
      changeLanguage(forceLang);
    
  });
  console.log('lang store', strings);
  const handler = new jedLib.Jed(strings[lang] || strings['en']);
  return h(Context.Provider, {
    value: { lang, handler, changeLanguage },
    children,
  });
};

export const useTranslationContext = (): Type => useContext(Context);