// Sliding drawers on the sidebar

// our global vars
// the delay between the slide in/out, and a little inertia

var sliders_initted = false;
      
var initSliders = function()
{
  sliders_initted = true;
  if ( KILL_SWITCH )
    return false;
    // detect whether the user has ie or not, how we get the height is different 
    var useragent = navigator.userAgent.toLowerCase();
    var ie = ((useragent.indexOf('msie') != -1) && (useragent.indexOf('opera') == -1) && (useragent.indexOf('webtv') == -1));
    
    if(ie)
      return;
    
    var divs = getElementsByClassName(document, "div", "slideblock");
    
    for(var i=0; i<divs.length; i++)
    {
        // set a unique id for this slider
        divs[i].metaid = i;
        
        // get the original height
        var baseheight = (ie) ? divs[i].offsetHeight + "px" : document.defaultView.getComputedStyle(divs[i], null).getPropertyValue('height', null);

        // use cookies to toggle whether to display it or not
        var id = ( divs[i].parentNode.firstChild.nextSibling ) ? divs[i].parentNode.firstChild.nextSibling.firstChild : divs[i].parentNode.parentNode.firstChild.nextSibling.firstChild;
        
        if ( !id.nextSibling )
          return;
        
        if(id.innerHTML || id.nextSibling.length < 1) id = id.innerHTML;
        else id = id.nextSibling.innerHTML; // Gecko fix
        
        var cookieName = 'mdgSliderState_'+i; // id.replace(' ', '_');
        //alert(cookieName + ': ' + readCookie(cookieName));
        if(readCookie(cookieName)=='closed')
        {
          divs[i].style.display = "none";
        }
        else
        {
          divs[i].style.display = "block";
        }

        // "save" our div height, because once it's display is set to none we can't get the original height again
        var d = new div();
        d.el = divs[i];
        d.ht = baseheight.substring(0, baseheight.indexOf("p"));

        // store our saved version
        divheights[i] = d;        
    }
}

addOnloadHook(initSliders);

// this is one of our divs, it just has a DOM reference to the element and the original height
function div(_el, _ht)
{
    this.el = _el;
    this.ht = _ht;
}

function toggle(t)
{
  if(IE)
    return false;
  if ( KILL_SWITCH )
    return false;
  if ( !sliders_initted )
    initSliders();
    // reset our inertia base and interval
    inertiabase = inertiabaseoriginal;
    clearInterval(slideinterval);

    // get our block
    block = t.parentNode.nextSibling;

    // for mozilla, it doesn't like whitespace between elements
    if(block.className == undefined)
        block = t.parentNode.nextSibling.nextSibling;
      
    if(block.style.display == "none")
    {
        block.style.display = "block";
        block.style.height = "1px";

        // our goal and current height
        targetheight = divheight(block);
        heightnow = 1;
        
        // remember toggled state
        cookieName = 'mdgSliderState_'+block.metaid; // t.innerHTML.replace(' ', '_');
        createCookie(cookieName, 'open', 3650);

        // our interval
        slideinterval = setInterval(slideout, slideintervalinc);
    }
    else
    {
        // our goal and current height
        targetheight = 1;
        heightnow = divheight(block);
        
        // remember toggled state
        cookieName = 'mdgSliderState_'+block.metaid; // t.innerHTML.replace(' ', '_');
        createCookie(cookieName, 'closed', 3650);

        // our interval
        slideinterval = setInterval(slidein, slideintervalinc);
    }
}

// this is our slidein function the interval uses, it keeps subtracting
// from the height till it's 1px then it hides it
function slidein()
{
    if(heightnow > targetheight)
    {
        // reduce the height by intertiabase * inertiainc
        heightnow -= inertiabase;

        // increase the intertiabase by the amount to keep it changing
        inertiabase += inertiainc;

        // it's possible to exceed the height we want so we use a ternary - (condition) ? when true : when false;
        block.style.height = (heightnow > 1) ? heightnow + "px" : targetheight + "px";
    }
    else
    {
        // finished, so hide the div properly and kill the interval
        clearInterval(slideinterval);
        block.style.display = "none";
    }
}

// this is the function our slideout interval uses, it keeps adding
// to the height till it's fully displayed
function slideout()
{
    block.style.display = 'block';
    if(heightnow < targetheight)
    {
        // increases the height by the inertia stuff
        heightnow += inertiabase;

        // increase the inertia stuff
        inertiabase += inertiainc;

        // it's possible to exceed the height we want so we use a ternary - (condition) ? when true : when false;
        block.style.height = (heightnow < targetheight) ? heightnow + "px" : targetheight + "px";
        
    }
    else
    {
        // finished, so make sure the height is what it's meant to be (inertia can make it off a little)
        // then kill the interval
        clearInterval(slideinterval);
        block.style.height = targetheight + "px";
    }
}

// returns the height of the div from our array of such things
function divheight(d)
{
    for(var i=0; i<divheights.length; i++)
    {
        if(divheights[i].el == d)
        {
            return divheights[i].ht;
        }
    }
}