const tripleStache = /\{\{\{\s*(.*?)\s*\}\}\}/g;
const doubleStache = /\{\{\s*(.*?)\s*\}\}/g;

let localizationHandlebarsExtension = (hbs: any, opts: any) => {
  hbs.registerHelper('t', (key: string, hash = {} as any) => {
    const locale = opts.locale;
    let result = opts.texts[key] || key;
    result = (typeof result === 'object') ? result[locale] : result;
    if (!result) return 'Missing translation for ' + key;
    const data = hash.data.root;
    return result.replace(doubleStache, (i: any, match: any) => {
      return data[match] ? data[match] : ('{{' + match + '}}');
    }).replace(tripleStache, (i: any, match: any) => {
      // TODO: escaping
      return data[match] ? data[match] : ('{{{' + match + '}}}');
    });
  });
};

module.exports = localizationHandlebarsExtension;