const { TRANSLATE_LANGUAGES, TRANSLATE_LANGUAGE_MAPPINGS, TRANSLATE_LANGUAGE_ALIASES, DICTIONARY_LANGUAGES } = require("../constants");

function getCode(desiredLang) {
  if (!desiredLang) {
      return false;
  }
  desiredLang = desiredLang.toLowerCase();

  if (TRANSLATE_LANGUAGES[desiredLang]) {
      return desiredLang;
  }

  var keys = Object.keys(TRANSLATE_LANGUAGES).filter(function (key) {
    if (typeof TRANSLATE_LANGUAGES[key] !== 'string') {
        return false;
    }

    if(TRANSLATE_LANGUAGES[key].toLowerCase() === desiredLang) return true;
    if(TRANSLATE_LANGUAGES[key].toLowerCase().startsWith(desiredLang)) return true;
    return false;
  });

  keys.push(Object.keys(TRANSLATE_LANGUAGE_MAPPINGS).filter(function (key) {
    if (typeof TRANSLATE_LANGUAGE_MAPPINGS[key] !== 'string') {
        return false;
    }

    if(TRANSLATE_LANGUAGE_MAPPINGS[key].toLowerCase() === desiredLang) return true;
    if(TRANSLATE_LANGUAGE_MAPPINGS[key].toLowerCase().startsWith(desiredLang)) return true;
    return false;
  }));

  return keys[0] || false;
}

module.exports.getCodeFromAny = function (prompt) {
  if(TRANSLATE_LANGUAGE_ALIASES[prompt.toLowerCase()]) prompt = TRANSLATE_LANGUAGE_ALIASES[prompt.toLowerCase()]
  if(TRANSLATE_LANGUAGES[prompt.toLowerCase()]) return prompt.toLowerCase()
  let languages = [];
  for(const i of Object.keys(TRANSLATE_LANGUAGES)) if(!languages.includes(i) && (TRANSLATE_LANGUAGES[i].toLowerCase() == prompt.toLowerCase() || TRANSLATE_LANGUAGES[i].toLowerCase().startsWith(prompt.toLowerCase()))) languages.push(i)
  for(const i of Object.keys(TRANSLATE_LANGUAGE_MAPPINGS)) if(!languages.includes(i) && TRANSLATE_LANGUAGE_MAPPINGS[i].toLowerCase() == prompt.toLowerCase()) languages.push(i)
  return languages[0];
};


module.exports.dictionaryGetCodeFromAny = function (prompt) {
  if(DICTIONARY_LANGUAGES[prompt.toLowerCase()]) return prompt.toLowerCase()
  let languages = [];
  for(const i of Object.keys(DICTIONARY_LANGUAGES)) if(!languages.includes(i) && DICTIONARY_LANGUAGES[i].toLowerCase() == prompt.toLowerCase()) languages.push(i)
  return languages[0];
};


module.exports.isSupported = function (desiredLang) {
  return Boolean(getCode(desiredLang));
}