import { observable, action } from 'mobx';

import en from './en.json'
import ru from './ru.json'

class Localize {
  @observable lang;

  constructor(catalogs) {
    const lang = localStorage.getItem('lang');

    this.lang = Object.keys(catalogs).indexOf(lang) === -1 ? Object.keys(catalogs)[0] : lang;
    this.catalogs = catalogs;

    return new Proxy(this, {
      get(target, property) {
        if(target.catalogs[target.lang][property]) {
          return target.catalogs[target.lang][property];
        }

        return target[property];
      }
    });
  }

  @action changeLanguage(lang) {
    if(this.lang !== lang && Object.keys(this.catalogs).indexOf(lang) !== -1){
      localStorage.setItem('lang', lang);
      this.lang = lang;
    }
  }

  toggleLanguage = () => {
    const keys = Object.keys(this.catalogs);
    const index = keys.indexOf(this.lang);

    this.changeLanguage(keys.length - 1 === index ? keys[0] : keys[index + 1]);
  }
}

export default new Localize({ en, ru });