$(document).ready(main);

var referrerList = [
  {url: '.+tanukisoftware\.com\/.+'},
  {url: '.+tanukisoftware\.org\/.+'},
  {url: '.+tsl\.local\/.+'}
];

/* This function is called when the document is ready */
function main() {
  if($("#sidebar").length && $("#content").length) {
    floatDiv($("#sidebar"), $("#content").outerHeight(true));
  }

  // only collapse if the user is browsing the site
  if(matchReferrer(referrerList) == true) {
    $("div[class$='collapse']").toggle(); 
    $("span[class$='details']").toggleClass('details-flip');
  }

}

function matchReferrer(referrerList) {
  
  var referrer = document.referrer.toLowerCase();
  
  for(var i=0; i < referrerList.length; i++) {
    if(referrer.match(referrerList[i].url) != null ) {
      return true;
    }
  }
  return false;
}

function floatDiv(fltdiv, max_height) {
  
  // Animation flickers in Mozilla, so we disable it :(
  // If workaround is used (queue animation), the performance
  // is pretty bad, eat 100% CPU
  //
  // IE6+ looks good but a bit of flicker
  // TODO: implement animation (smooth) for this with jquery animate

  if ($.browser.mozilla || $.browser.msie) {
    // no animation
    return true;
  }

  step = 10;
  fltdiv_top = fltdiv.offset().top;
  fltdiv_height = fltdiv.height();

  $(window).scroll(function () { 
    if($(this).scrollTop() > fltdiv_top) {
      
      delta = $(this).scrollTop() - fltdiv_top;
      
      if( delta+step+fltdiv_height >= max_height ) {
        top_value = max_height - fltdiv_height;
      } else {
        top_value = delta + step;
      }

      fltdiv.css("top", top_value);

    } else {

      fltdiv.css("top", 0);

    }
  });

}

function setEqualHeight(columns) {

    var tallest_column = 0;
    columns.each(
        function() {
            current_height = $(this).height();
            if(current_height > tallest_column)
            {
                tallest_column  = current_height;
            }
        }
    );
    columns.height(tallest_column);
}