// JavaScript Document

function makeScrollable(wrapper, scrollable){
  // Get jQuery elements
  var wrapper = $(wrapper), scrollable = $(scrollable);

  // Hide images until they are not loaded
  scrollable.hide();
  var loading = $('<div class="loading">Loading...</div>').appendTo(wrapper);

  // Set function that will check if all images are loaded
  var interval = setInterval(function(){
    var images = scrollable.find('img');
    var completed = 0;

    // Counts number of images that are succesfully loaded
    images.each(function(){
      if (this.complete) completed++;
    });

    if (completed == images.length){
      clearInterval(interval);
      // Timeout added to fix problem with Chrome
      setTimeout(function(){

        loading.hide();
        // Remove scrollbars
        wrapper.css({overflow: 'hidden'});                                              

        scrollable.slideDown('slow', function(){
          enable();
        });
      }, 1000);
    }
  }, 100);

  function enable(){
  }
}

function enable(){
  // height of area at the top at bottom, that don't respond to mousemove
  var inactiveMargin = 100;
  // Cache for performance
  var wrapperWidth = wrapper.width();
  var wrapperHeight = wrapper.height();
  // Using outer height to include padding too
  var scrollableHeight = scrollable.outerHeight() + 2*inactiveMargin;
  // Do not cache wrapperOffset, because it can change when user resizes window
  // We could use onresize event, but it's just not worth doing that
  // var wrapperOffset = wrapper.offset();

  // Create a invisible tooltip
  var tooltip = $('<div class="sc_menu_tooltip"></div>')
    .css('opacity', 0)
    .appendTo(wrapper);

  // Save menu titles
  scrollable.find('a').each(function(){
    // The "data" function attaches custom data to an element
    $(this).data('tooltipText', this.title);
  });

  // Remove default tooltip
  scrollable.find('a').removeAttr('title');
  // Remove default tooltip in IE
  scrollable.find('img').removeAttr('alt');     

  var lastTarget;
  //When user move mouse over menu
  wrapper.mousemove(function(e){
    // Save target
    lastTarget = e.target;

    var wrapperOffset = wrapper.offset();

    var tooltipLeft = e.pageX - wrapperOffset.left;
    // Do not let tooltip to move out of menu.
    // Because overflow is set to hidden, we will not be able too see it
    tooltipLeft = Math.min(tooltipLeft, wrapperWidth - 75); //tooltip.outerWidth());

    var tooltipTop = e.pageY - wrapperOffset.top   wrapper.scrollTop() - 40;
    // Move tooltip under the mouse when we are in the higher part of the menu
    if (e.pageY - wrapperOffset.top < wrapperHeight/2){
      tooltipTop  = 80;
    }
    tooltip.css({top: tooltipTop, left: tooltipLeft});                          

    // Scroll menu
    var top = (e.pageY -  wrapperOffset.top) * (scrollableHeight - wrapperHeight) / wrapperHeight  - inactiveMargin;

    if (top < 0){
      top = 0;
    }
    wrapper.scrollTop(top);
  });

  // Setting interval helps solving perfomance problems in IE
  var interval = setInterval(function(){
    if (!lastTarget) return;    

    var currentText = tooltip.text();

    if (lastTarget.nodeName == 'IMG'){
      // We've attached data to a link, not image
      var newText = $(lastTarget).parent().data('tooltipText');

      // Show tooltip with the new text
      if (currentText != newText) {
        tooltip
          .stop(true)
          .css('opacity', 0)
          .text(newText)
          .animate({opacity: 1}, 1000);
      }
    }
  }, 200);

  // Hide tooltip when leaving menu
  wrapper.mouseleave(function(){
    lastTarget = false;
    tooltip.stop(true).css('opacity', 0).text('');
  });
}