(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.i18nextBrowserLanguageDetector = factory());
}(this, function () { 'use strict';

  function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  }

  function _defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  var arr = [];
  var each = arr.forEach;
  var slice = arr.slice;
  function defaults(obj) {
    each.call(slice.call(arguments, 1), function (source) {
      if (source) {
        for (var prop in source) {
          if (obj[prop] === undefined) obj[prop] = source[prop];
        }
      }
    });
    return obj;
  }

  var cookie = {
    create: function create(name, value, minutes, domain) {
      var expires;

      if (minutes) {
        var date = new Date();
        date.setTime(date.getTime() + minutes * 60 * 1000);
        expires = '; expires=' + date.toGMTString();
      } else expires = '';

      domain = domain ? 'domain=' + domain + ';' : '';
      document.cookie = name + '=' + value + expires + ';' + domain + 'path=/';
    },
    read: function read(name) {
      var nameEQ = name + '=';
      var ca = document.cookie.split(';');

      for (var i = 0; i < ca.length; i++) {
        var c = ca[i];

        while (c.charAt(0) === ' ') {
          c = c.substring(1, c.length);
        }

        if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
      }

      return null;
    },
    remove: function remove(name) {
      this.create(name, '', -1);
    }
  };
  var cookie$1 = {
    name: 'cookie',
    lookup: function lookup(options) {
      var found;

      if (options.lookupCookie && typeof document !== 'undefined') {
        var c = cookie.read(options.lookupCookie);
        if (c) found = c;
      }

      return found;
    },
    cacheUserLanguage: function cacheUserLanguage(lng, options) {
      if (options.lookupCookie && typeof document !== 'undefined') {
        cookie.create(options.lookupCookie, lng, options.cookieMinutes, options.cookieDomain);
      }
    }
  };

  var querystring = {
    name: 'querystring',
    lookup: function lookup(options) {
      var found;

      if (typeof window !== 'undefined') {
        var query = window.location.search.substring(1);
        var params = query.split('&');

        for (var i = 0; i < params.length; i++) {
          var pos = params[i].indexOf('=');

          if (pos > 0) {
            var key = params[i].substring(0, pos);

            if (key === options.lookupQuerystring) {
              found = params[i].substring(pos + 1);
            }
          }
        }
      }

      return found;
    }
  };

  var hasLocalStorageSupport;

  try {
    hasLocalStorageSupport = window !== 'undefined' && window.localStorage !== null;
    var testKey = 'i18next.translate.boo';
    window.localStorage.setItem(testKey, 'foo');
    window.localStorage.removeItem(testKey);
  } catch (e) {
    hasLocalStorageSupport = false;
  }

  var localStorage = {
    name: 'localStorage',
    lookup: function lookup(options) {
      var found;

      if (options.lookupLocalStorage && hasLocalStorageSupport) {
        var lng = window.localStorage.getItem(options.lookupLocalStorage);
        if (lng) found = lng;
      }

      return found;
    },
    cacheUserLanguage: function cacheUserLanguage(lng, options) {
      if (options.lookupLocalStorage && hasLocalStorageSupport) {
        window.localStorage.setItem(options.lookupLocalStorage, lng);
      }
    }
  };

  var navigator$1 = {
    name: 'navigator',
    lookup: function lookup(options) {
      var found = [];

      if (typeof navigator !== 'undefined') {
        if (navigator.languages) {
          // chrome only; not an array, so can't use .push.apply instead of iterating
          for (var i = 0; i < navigator.languages.length; i++) {
            found.push(navigator.languages[i]);
          }
        }

        if (navigator.userLanguage) {
          found.push(navigator.userLanguage);
        }

        if (navigator.language) {
          found.push(navigator.language);
        }
      }

      return found.length > 0 ? found : undefined;
    }
  };

  var htmlTag = {
    name: 'htmlTag',
    lookup: function lookup(options) {
      var found;
      var htmlTag = options.htmlTag || (typeof document !== 'undefined' ? document.documentElement : null);

      if (htmlTag && typeof htmlTag.getAttribute === 'function') {
        found = htmlTag.getAttribute('lang');
      }

      return found;
    }
  };

  var path = {
    name: 'path',
    lookup: function lookup(options) {
      var found;

      if (typeof window !== 'undefined') {
        var language = window.location.pathname.match(/\/([a-zA-Z-]*)/g);

        if (language instanceof Array) {
          if (typeof options.lookupFromPathIndex === 'number') {
            if (typeof language[options.lookupFromPathIndex] !== 'string') {
              return undefined;
            }

            found = language[options.lookupFromPathIndex].replace('/', '');
          } else {
            found = language[0].replace('/', '');
          }
        }
      }

      return found;
    }
  };

  var subdomain = {
    name: 'subdomain',
    lookup: function lookup(options) {
      var found;

      if (typeof window !== 'undefined') {
        var language = window.location.href.match(/(?:http[s]*\:\/\/)*(.*?)\.(?=[^\/]*\..{2,5})/gi);

        if (language instanceof Array) {
          if (typeof options.lookupFromSubdomainIndex === 'number') {
            found = language[options.lookupFromSubdomainIndex].replace('http://', '').replace('https://', '').replace('.', '');
          } else {
            found = language[0].replace('http://', '').replace('https://', '').replace('.', '');
          }
        }
      }

      return found;
    }
  };

  function getDefaults() {
    return {
      order: ['querystring', 'cookie', 'localStorage', 'navigator', 'htmlTag'],
      lookupQuerystring: 'lng',
      lookupCookie: 'i18next',
      lookupLocalStorage: 'i18nextLng',
      // cache user language
      caches: ['localStorage'],
      excludeCacheFor: ['cimode'],
      //cookieMinutes: 10,
      //cookieDomain: 'myDomain'
      checkWhitelist: true
    };
  }

  var Browser =
  /*#__PURE__*/
  function () {
    function Browser(services) {
      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

      _classCallCheck(this, Browser);

      this.type = 'languageDetector';
      this.detectors = {};
      this.init(services, options);
    }

    _createClass(Browser, [{
      key: "init",
      value: function init(services) {
        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
        var i18nOptions = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
        this.services = services;
        this.options = defaults(options, this.options || {}, getDefaults()); // backwards compatibility

        if (this.options.lookupFromUrlIndex) this.options.lookupFromPathIndex = this.options.lookupFromUrlIndex;
        this.i18nOptions = i18nOptions;
        this.addDetector(cookie$1);
        this.addDetector(querystring);
        this.addDetector(localStorage);
        this.addDetector(navigator$1);
        this.addDetector(htmlTag);
        this.addDetector(path);
        this.addDetector(subdomain);
      }
    }, {
      key: "addDetector",
      value: function addDetector(detector) {
        this.detectors[detector.name] = detector;
      }
    }, {
      key: "detect",
      value: function detect(detectionOrder) {
        var _this = this;

        if (!detectionOrder) detectionOrder = this.options.order;
        var detected = [];
        detectionOrder.forEach(function (detectorName) {
          if (_this.detectors[detectorName]) {
            var lookup = _this.detectors[detectorName].lookup(_this.options);

            if (lookup && typeof lookup === 'string') lookup = [lookup];
            if (lookup) detected = detected.concat(lookup);
          }
        });
        var found;
        detected.forEach(function (lng) {
          if (found) return;

          var cleanedLng = _this.services.languageUtils.formatLanguageCode(lng);

          if (!_this.options.checkWhitelist || _this.services.languageUtils.isWhitelisted(cleanedLng)) found = cleanedLng;
        });

        if (!found) {
          var fallbacks = this.i18nOptions.fallbackLng;
          if (typeof fallbacks === 'string') fallbacks = [fallbacks];
          if (!fallbacks) fallbacks = [];

          if (Object.prototype.toString.apply(fallbacks) === '[object Array]') {
            found = fallbacks[0];
          } else {
            found = fallbacks[0] || fallbacks["default"] && fallbacks["default"][0];
          }
        }

        return found;
      }
    }, {
      key: "cacheUserLanguage",
      value: function cacheUserLanguage(lng, caches) {
        var _this2 = this;

        if (!caches) caches = this.options.caches;
        if (!caches) return;
        if (this.options.excludeCacheFor && this.options.excludeCacheFor.indexOf(lng) > -1) return;
        caches.forEach(function (cacheName) {
          if (_this2.detectors[cacheName]) _this2.detectors[cacheName].cacheUserLanguage(lng, _this2.options);
        });
      }
    }]);

    return Browser;
  }();

  Browser.type = 'languageDetector';

  return Browser;

}));
