/*Copyright 2014 Anthony Garand http://garand.me

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.*/

// Sticky Plugin v1.0.0 for jQuery
// =============
// Author: Anthony Garand
// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
// Improvements by Leonardo C. Daronco (daronco)
// Created: 2/14/2011
// Date: 2/12/2012
// Website: http://labs.anthonygarand.com/sticky
// Description: Makes an element on the page stick on the screen as you scroll
//       It will only set the 'top' and 'position' of your element, you
//       might need to adjust the width in some cases.

(function($) {
  var defaults = {
      topSpacing: 0,
      bottomSpacing: 0,
      className: 'is-sticky',
      wrapperClassName: 'sticky-wrapper',
      center: false,
      getWidthFrom: ''
    },
    $window = $(window),
    $document = $(document),
    sticked = [],
    windowHeight = $window.height(),
    scroller = function() {
      var scrollTop = $window.scrollTop(),
        documentHeight = $document.height(),
        dwh = documentHeight - windowHeight,
        extra = (scrollTop > dwh) ? dwh - scrollTop : 0;

      for (var i = 0; i < sticked.length; i++) {
        var s = sticked[i],
          elementTop = s.stickyWrapper.offset().top,
          etse = elementTop - s.topSpacing - extra;

        if (scrollTop <= etse) {
          if (s.currentTop !== null) {
            s.stickyElement
              .css('position', '')
              .css('top', '');
            s.stickyElement.parent().removeClass(s.className);
            s.currentTop = null;
          }
        }
        else {
          var newTop = documentHeight - s.stickyElement.outerHeight()
            - s.topSpacing - s.bottomSpacing - scrollTop - extra;
          if (newTop < 0) {
            newTop = newTop + s.topSpacing;
          } else {
            newTop = s.topSpacing;
          }
          if (s.currentTop != newTop) {
            s.stickyElement
              .css('position', 'fixed')
              .css('top', newTop);

            if (typeof s.getWidthFrom !== 'undefined') {
              s.stickyElement.css('width', $(s.getWidthFrom).width());
            }

            s.stickyElement.parent().addClass(s.className);
            s.currentTop = newTop;
          }
        }
      }
    },
    resizer = function() {
      windowHeight = $window.height();
    },
    methods = {
      init: function(options) {
        var o = $.extend({}, defaults, options);
        return this.each(function() {
          var stickyElement = $(this);

          var stickyId = stickyElement.attr('id');
          var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName 
          var wrapper = $('<div></div>')
            .attr('id', stickyId + '-sticky-wrapper')
            .addClass(o.wrapperClassName);
          stickyElement.wrapAll(wrapper);

          if (o.center) {
            stickyElement.parent().css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});
          }

          if (stickyElement.css("float") == "right") {
            stickyElement.css({"float":"none"}).parent().css({"float":"right"});
          }

          var stickyWrapper = stickyElement.parent();
          stickyWrapper.css('height', stickyElement.outerHeight());
          sticked.push({
            topSpacing: o.topSpacing,
            bottomSpacing: o.bottomSpacing,
            stickyElement: stickyElement,
            currentTop: null,
            stickyWrapper: stickyWrapper,
            className: o.className,
            getWidthFrom: o.getWidthFrom
          });
        });
      },
      update: scroller,
      unstick: function(options) {
        return this.each(function() {
          var unstickyElement = $(this);

          var removeIdx = -1;
          for (var i = 0; i < sticked.length; i++) 
          {
            if (sticked[i].stickyElement.get(0) == unstickyElement.get(0))
            {
                removeIdx = i;
            }
          }
          if(removeIdx != -1)
          {
            sticked.splice(removeIdx,1);
            unstickyElement.unwrap();
            unstickyElement.removeAttr('style');
          }
        });
      }
    };

  // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
  if (window.addEventListener) {
    window.addEventListener('scroll', scroller, false);
    window.addEventListener('resize', resizer, false);
  } else if (window.attachEvent) {
    window.attachEvent('onscroll', scroller);
    window.attachEvent('onresize', resizer);
  }

  $.fn.sticky = function(method) {
    if (methods[method]) {
      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
    } else if (typeof method === 'object' || !method ) {
      return methods.init.apply( this, arguments );
    } else {
      $.error('Method ' + method + ' does not exist on jQuery.sticky');
    }
  };

  $.fn.unstick = function(method) {
    if (methods[method]) {
      return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
    } else if (typeof method === 'object' || !method ) {
      return methods.unstick.apply( this, arguments );
    } else {
      $.error('Method ' + method + ' does not exist on jQuery.sticky');
    }

  };
  $(function() {
    setTimeout(scroller, 0);
  });
})(jQuery);