if (typeof window.ASC === 'undefined') {
  window.ASC = {};
}
if (typeof window.ASC.Controls === 'undefined') {
  window.ASC.Controls = {};
}

if (typeof window.ASC.Controls.AnchorController === 'undefined') {
  window.ASC.Controls.AnchorController = (function () {
    var
      isInit = false,
      domIsReady = false,
      checkInterval = 200,
      firstAnchor = '',
      lastAnchor = '#',
      currentAnchor = '#',
      cmdSeparator = '/',
      markCollection = [],
      customEvents = {},
      supportedCustomEvents = {
        // update location.hash
        'onupdate' : true,
        'ondomready' : true
      },
      browser = (function () {
        var
          ua = navigator.userAgent,
          version = (ua.match(/.+(?:rv|it|ra|ie|ox|me|on)[\/:\s]([\d.]+)/i)||[0,'0'])[1];
        return {
          version : isFinite(+version) ? +version : version,
          // popular browsers
          msie : '\v' == 'v' || /msie/i.test(ua),
          opera : window.opera ? true : false,
          chrome : window.chrome ? true : false,
          safari : /safari/i.test(ua) && !window.chrome,
          firefox : /firefox/i.test(ua),
          mozilla : /mozilla/i.test(ua) && !/(compatible|webkit)/.test(ua),
          // engine
          gecko  : /gecko/i.test(ua),
          webkit  : /webkit/i.test(ua)
        };
      })(),
      ieHelper = null,
      needHelper = browser.msie && (browser.version < 8 || document.documentMode < 8);

    var getRandomId = function (prefix) {
      return (typeof prefix !== 'undefined' ? prefix + '-' : '') + Math.floor(Math.random() * 1000000);
    };

    var getUniqueId = function (o, prefix) {
      var
        iterCount = 0,
        maxIterations = 1000,
        uniqueId = getRandomId(prefix);

      while (o.hasOwnProperty(uniqueId) && iterCount++ < maxIterations) {
        uniqueId = getRandomId(prefix);
      }
      return uniqueId;
    };

    var customEventIsSupported = function (eventType) {
      if (supportedCustomEvents.hasOwnProperty(eventType = eventType.toLowerCase())) {
        return supportedCustomEvents[eventType];
      }
      return false;
    };

    var execCustomEvent = function (eventType, thisArg, argsArray) {
      eventType = eventType.toLowerCase();
      thisArg = thisArg || window;
      argsArray = argsArray || [];

      if (!customEvents.hasOwnProperty(eventType)) {
        return undefined;
      }
      var customEvent = customEvents[eventType];

      for (var eventId in customEvent) {
        if (customEvent.hasOwnProperty(eventId)) {
          customEvent[eventId].handler.apply(thisArg, argsArray);
          if (customEvent[eventId].type & 1) {
            delete customEvent[eventId];
          }
        }
      }
    };

    var addCustomEvent = function (eventType, handler, params) {
      if (typeof eventType !== 'string' || typeof handler !== 'function') {
        return undefined;
      }

      eventType = eventType.toLowerCase();
      if (!customEventIsSupported(eventType)) {
        return undefined;
      }

      params = params || {};
      var isOnceExec = params.hasOwnProperty('once') ? params.once : false;

      var handlerType = 0;
      handlerType |= +isOnceExec * 1;  

      if (!customEvents.hasOwnProperty(eventType)) {
        customEvents[eventType] = {};
      }

      var eventId = getUniqueId(customEvents[eventType]);
      customEvents[eventType][eventId] = {handler : handler, type : handlerType};
      return eventId;
    };

    var removeCustomEvent = function (eventType, eventId) {
      if (typeof eventType !== 'string' || !customEventIsSupported(eventType = eventType.toLowerCase()) || typeof eventId === 'undefined') {
        return false;
      }

      if (customEvents(eventType) && customEvents[eventType].hasOwnProperty(eventId)) {
        delete userEventHandlers[eventType][eventId];
      }
      return true;
    };

    var domReady = function () {
      // Mozilla, Opera and webkit nightlies currently support this event
      if (document.addEventListener) {
        document.addEventListener('DOMContentLoaded', function () {
          document.removeEventListener('DOMContentLoaded', arguments.callee, false);
          setTimeout(ASC.Controls.AnchorController.ready, 0);
        }, false);

        // If IE event model is used
      } else if (document.attachEvent) {
        // ensure firing before onload,
        // maybe late but safe also for iframes
        document.attachEvent('onreadystatechange', function () {
          if (document.readyState === 'complete') {
            document.detachEvent('onreadystatechange', arguments.callee);
            setTimeout(ASC.Controls.AnchorController.ready, 0);
          }
        });

        // If IE and not an iframe
        // continually check to see if the document is ready
        if (document.documentElement.doScroll && window == window.top) {
          (function () {
            try {
              // If IE is used, use the trick by Diego Perini
              // http://javascript.nwbox.com/IEContentLoaded/
              document.documentElement.doScroll('left');
            } catch (error) {
              setTimeout(arguments.callee, 0);
              return undefined;
            }
            // and execute any waiting functions
            setTimeout(ASC.Controls.AnchorController.ready, 1000);
          })();
        }
      }

      // A fallback to window.onload, that will always work
      if (window.addEventListener) {
        window.addEventListener('load', function () {window.removeEventListener('load', arguments.callee, false); setTimeout(ASC.Controls.AnchorController.ready, 0);}, false);
      } else if (window.attachEvent) {
        window.attachEvent('load', function () {load.detachEvent('load', arguments.callee); setTimeout(ASC.Controls.AnchorController.ready, 0);});
      }
    };

    var historyCheck = (function () {
      if (needHelper) {
        return function () {
          var anchor = ieHelper.contentWindow.document.location.hash;
          if (anchor.length === 0) {
            anchor = '#';
          }
          if (anchor !== currentAnchor) {
            currentAnchor = anchor;
            var label = currentAnchor.substring(1);
            location.hash = label;
            execCustomEvent('onupdate', window, [label]);
          }
          anchor = location.hash;
          if (anchor.length === 0) {
            anchor = '#';
          }
          if (anchor !== currentAnchor) {
            var iframe = ieHelper.contentWindow.document;
            iframe.open();
            iframe.close();
            iframe.location.hash = anchor;
            currentAnchor = anchor;
            var label = currentAnchor.substring(1);
            execCustomEvent('onupdate', window, [label]);
          }
        };
      }
      return function () {
        var anchor = location.hash;
        if (anchor.length === 0) {
          anchor = '#';
        }
        if (anchor !== currentAnchor) {
          currentAnchor = anchor;
          var label = currentAnchor.substring(1);
          execCustomEvent('onupdate', window, [label]);
        }
      };
    })();

    var update = (function () {
      if (needHelper) {
        return function (anchor, safe) {
          if (ieHelper === null) {
            var anchor = location.hash;
            if (anchor.length === 0) {
              anchor = '#';
            }
            ieHelper = document.createElement('iframe');
            ieHelper.style.width = '1px';
            ieHelper.style.height = '1px';
            ieHelper.style.lineHeight = '1px';
            ieHelper.style.position = 'absolute';
            ieHelper.style.left = '0';
            ieHelper.style.top = '0';
            ieHelper.style.zIndex = '-1';
            ieHelper.style.visibility = 'hidden';
            document.body.appendChild(ieHelper);
            ieHelper.setAttribute('src', 'javascript:false;');
            var iframe = ieHelper.contentWindow.document;
            iframe.open();
            iframe.close();
            iframe.location.hash = anchor;
            lastAnchor = currentAnchor;
            currentAnchor = anchor;
            var label = currentAnchor.substring(1);
            if (safe !== true) {
              execCustomEvent('onupdate', window, [label]);
            }
          }
          if (typeof anchor === 'string' && anchor.charAt(0) !== '#') {
            anchor = '#' + anchor;
          }
          if (typeof anchor !== 'string' || anchor.length === 0) {
            anchor = '#';
          }
          if (currentAnchor === anchor) {
            var label = currentAnchor.substring(1);
            if (safe !== true) {
              execCustomEvent('onupdate', window, [label]);
            }
            return undefined;
          }
          lastAnchor = currentAnchor;
          currentAnchor = anchor;
          var iframe = ieHelper.contentWindow.document;
          iframe.open();
          iframe.close();
          iframe.location.hash = currentAnchor;
          var label = currentAnchor.substring(1);
          location.hash = label;
          if (safe !== true) {
            execCustomEvent('onupdate', window, [label]);
          }
        };
      }
      return function (anchor, safe) {
        if (typeof anchor === 'string' && anchor.charAt(0) !== '#') {
          anchor = '#' + anchor;
        }
        if (typeof anchor !== 'string' || anchor.length === 0) {
          anchor = '#';
        }
        if (currentAnchor === anchor) {
          var label = currentAnchor.substring(1);
          if (safe !== true) {
            execCustomEvent('onupdate', window, [label]);
          }
          return undefined;
        }
        lastAnchor = currentAnchor;
        currentAnchor = anchor;
        var label = currentAnchor.substring(1);
        location.hash = label;
        if (safe !== true) {
          execCustomEvent('onupdate', window, [label]);
        }
      };
    })();

    var onUpdateAnchor = function (anchor) {
      for (var i = 0, n = markCollection.length; i < n; i++) {
        var params = [];
        if (markCollection[i].regexp === null) {
          if (anchor.length === 0) {
            markCollection[i].handler.apply(window, params);
          }
        } else {
          if ((params = markCollection[i].regexp.exec(anchor)) !== null) {
            // TODO: place for do somthing with parameters string 
            if (params.length > 1) {
              params = params.slice(1);
            } else {
              params = [];
            }
            markCollection[i].handler.apply(window, params);
          }
        }
      }
    };

    var init = function () {
      if (isInit === false) {
        isInit = true;
        if (needHelper === true && ieHelper === null) {
          var anchor = location.hash;
          if (anchor.length === 0) {
            anchor = '#';
          }
          ieHelper = document.createElement('iframe');
          ieHelper.style.width = '1px';
          ieHelper.style.height = '1px';
          ieHelper.style.lineHeight = '1px';
          ieHelper.style.position = 'absolute';
          ieHelper.style.left = '0';
          ieHelper.style.top = '0';
          ieHelper.style.zIndex = '-1';
          ieHelper.style.visibility = 'hidden';
          document.body.appendChild(ieHelper);
          ieHelper.setAttribute('src', 'javascript:false;');
          var iframe = ieHelper.contentWindow.document;
          iframe.open();
          iframe.close();
          iframe.location.hash = anchor;
          currentAnchor = anchor;
          var label = currentAnchor.substring(1);
          execCustomEvent('onupdate', window, [label]);
        } else {
          var anchor = location.hash;
          if (anchor.length === 0) {
            anchor = '#';
          }
          currentAnchor = anchor;
          var label = currentAnchor.substring(1);
          execCustomEvent('onupdate', window, [label]);
        }
        setInterval(historyCheck, checkInterval);
      }
    };

    var move = function () {
      var  hash = '';
      if (arguments.length === 0) {
        update('');
        return undefined;
      }
      for (i = 0, n = arguments.length - 1; i < n; i++) {
        hash += arguments[i] + cmdSeparator;
      }
      update(hash + arguments[i]);
    };

    var safemove = function () {
      var  hash = '';
      if (arguments.length === 0) {
        update('', true);
        return undefined;
      }
      for (i = 0, n = arguments.length - 1; i < n; i++) {
        hash += arguments[i] + cmdSeparator;
      }
      update(hash + arguments[i], true);
    };

    var ready = function () {
      if (domIsReady === false) {
        domIsReady = true;
        execCustomEvent('ondomready', window, []);
      }
    };

    var bind = function (value, handler, params) {
      if (arguments.length === 0) {
        return false;
      }
      if (arguments.length === 1 && typeof value === 'function') {
        return addCustomEvent('onupdate', value);
      }
      if (typeof value === 'string' && typeof handler === 'function') {
        return addCustomEvent(value, handler, params);
      }
      if (typeof value !== 'undefined' && typeof handler === 'function') {
        return markCollection.push({regexp  : value, handler : handler}) - 1;
      }
      return undefined;
    };

    var unbind = function (value, handlerId) {
      if (arguments.length === 0) {
        return false;
      }
      if (arguments.length === 1) {
        if (value >= 0 && value < markCollection.length) {
          markCollection.splice(value, 1);
        }
        return removeCustomEvent('onupdate', value);
      }
      return removeCustomEvent(value, handlerId);
    };

    var getAnchor = function () {
      if (isInit === true) {
        return currentAnchor.substring(1);
      } else {
        return firstAnchor.substring(1);
      }
    };

    var getLastAnchor = function () {
      return isInit === true ? lastAnchor.substring(1) : firstAnchor.substring(1);
    };

    firstAnchor = location.hash;
    firstAnchor = firstAnchor.charAt(0) === '#' ? firstAnchor : '#' + firstAnchor;
    addCustomEvent('onupdate', onUpdateAnchor);
    addCustomEvent('ondomready', init);
    domReady();

    return {
      init          : init,
      ready         : ready,
      move          : move,
      safemove      : safemove,
      bind          : bind,
      unbind        : unbind,
      getAnchor     : getAnchor,
      getLastAnchor : getLastAnchor
    };
  })();
}