"use strict";

//使用自执行函数，避免污染同名变量
(function () {
  var languageList = ['zh-CN'];
  var LOCAL_LANGUAGE = navigator.language;

  var getLanguage = function getLanguage() {
    var language = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : localStorage.handPyLanguage || LOCAL_LANGUAGE;
    if (!languageList.includes(language) || !languageList.includes(language.split("-")[0])) language = 'zh-CN';
    var val = location.search.match(new RegExp('[?&]lang=([^&]+)'));
    language = val ? decodeURIComponent(val[1].replace(/\+/g, '%20')) : '';

    if (['en', 'zh-hant', 'zh-hans'].indexOf(language) < 0) {
      language = 'zh-hant';
    }

    localStorage.handPyLanguage = language;
    document.write('<script src="/blockly/msg/' + language + '/blockly_messages.js"><\/script>');
    document.write('<script src="/blockly/msg/' + language + '/blocks_messages.js"><\/script>');
    document.write('<script src="/blockly/msg/' + language + '/microbit_messages.js"><\/script>');
    document.write('<script src="/blockly/msg/' + language + '/other_messages.js"><\/script>');
    document.write('<script src="/blockly/msg/js/' + language + '.js"><\/script>');
  };

  getLanguage();
})();