if (typeof(Alchemy) === 'undefined') {
  var Alchemy = {};
}

(function ($) {

  $.extend(Alchemy, {

    ElementDirtyObserver:function (selector) {
      var $elements = $(selector);
      $elements.find('textarea.tinymce').map(function () {
        var $this = $(this);
        var ed = tinymce.get(this.id);
        ed.onChange.add(function (ed, l) {
          Alchemy.setElementDirty($this.parents('.element_editor'));
        });
      });
      $elements.find('input[type="text"]').bind('change', function () {
        $(this).addClass('dirty');
        Alchemy.setElementDirty($(this).parents('.element_editor'));
      });
      $elements.find('.element_foot input[type="checkbox"]').bind('click', function () {
        $(this).addClass('dirty');
        Alchemy.setElementDirty($(this).parents('.element_editor'));
      });
      $elements.find('select').bind('change', function () {
        $(this).addClass('dirty');
        Alchemy.setElementDirty($(this).parents('.element_editor'));
      });
    },

    setElementDirty:function (element) {
      var $element = $(element);
      $element.addClass('dirty');
      $element.find('.element_head .icon').addClass('element_dirty');
    },

    setElementClean:function (element) {
      var $element = $(element);
      $element.removeClass('dirty');
      $element.find('.element_foot input[type="checkbox"]').removeClass('dirty');
      $element.find('input[type="text"]').removeClass('dirty');
      $element.find('select').removeClass('dirty');
      $element.find('.element_head .icon').removeClass('element_dirty');
    },

    isPageDirty:function () {
      return $('#element_area').find('.element_editor.dirty').size() > 0;
    },

    checkPageDirtyness:function (element, text) {
      var okcallback;
      if ($(element).is('form')) {
        okcallback = function () {
          var $form = $('<form action="' + element.action + '" method="POST" style="display: none"></form>');
          $form.append($(element).find('input'));
          $form.appendTo('body');
          Alchemy.pleaseWaitOverlay();
          $form.submit();
        };
      } else if ($(element).is('a')) {
        okcallback = function () {
          Alchemy.pleaseWaitOverlay();
          document.location = element.pathname;
        };
      }
      if (Alchemy.isPageDirty()) {
        Alchemy.openConfirmWindow({
          title:text.title,
          message:text.message,
          okLabel:text.okLabel,
          cancelLabel:text.cancelLabel,
          okCallback:okcallback
        });
        return false;
      } else {
        return true;
      }
    },

    PageLeaveObserver:function (texts) {
      $('#main_navi a').click(function (event) {
        if (!Alchemy.checkPageDirtyness(event.currentTarget, texts)) {
          event.preventDefault();
        }
      });
    }

  });

})(jQuery);