var DDSPEED = 5;
var DDTIMER = 15;

var setting_to_post = 'Any Setting';
var genre_to_post = 'Any Genre';
var platform_to_post = 'Any Platform';
var dist_to_post = 'Any Way';
var sortby = '';
var order = 'ASC';
var pagenum = 1;
var maxpages = 1;

// function to save selected values
function submit_filters() 
{

    var form = document.createElement("form");
    form.setAttribute("method", "post");
    form.setAttribute("action", "index.php#gamelistanchor");

	
		var hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'setting');
    hiddenField.setAttribute("value", setting_to_post);
    form.appendChild(hiddenField);		

		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'genre');
    hiddenField.setAttribute("value", genre_to_post);
    form.appendChild(hiddenField);

		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'platform');
    hiddenField.setAttribute("value", platform_to_post);
    form.appendChild(hiddenField);

		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'distribution');
    hiddenField.setAttribute("value", dist_to_post);
    form.appendChild(hiddenField);
	
		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'sortby');
    hiddenField.setAttribute("value", sortby);
    form.appendChild(hiddenField);
	
		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'order');
    hiddenField.setAttribute("value", order);
    form.appendChild(hiddenField);
	
		hiddenField = document.createElement("input");
    hiddenField.setAttribute("type", "hidden");
    hiddenField.setAttribute("name", 'pagenum');
    hiddenField.setAttribute("value", pagenum );
    form.appendChild(hiddenField);	


    document.body.appendChild(form);    // Not entirely sure if this is necessary

    form.submit();
}


function select_sortby( field, lastOrder )
{
	sortby = field;
	
	//Toggle search results display order
	if( lastOrder == 'ASC' )
	{
		order = 'DESC';
	}
	else if( lastOrder == 'DESC' )
	{
		order = 'ASC';
	}
	else
	{
		alert('invalid order!');	
	}
	submit_filters();
}

function select_order( upordown )
{
	order = upordown;	
}

function select_setting(filter)
{
	setting_to_post = filter;
	document.getElementById('one-ddheader').innerHTML = filter;
	
}

function select_genre(filter)
{
	genre_to_post = filter;
	document.getElementById('two-ddheader').innerHTML = filter;
}

function select_platform(filter)
{
	platform_to_post = filter;
	document.getElementById('three-ddheader').innerHTML = filter;
}

function select_distribution(filter)
{
	dist_to_post = filter;
	document.getElementById('three-ddheader').innerHTML = filter;
}
function highlight_menuitem(id)
{
	document.getElementByID(id).className = 'input.btn_hover';
}

function unhighlight_menuitem(id)
{
	document.getElementByID(id).className = 'input.btn';
}


function prevpage()
{
	if( pagenum > 1 )
	{
		pagenum--;
		submit_filters();
	}
}

function nextpage()
{
	if( pagenum < maxpages )
	{
		pagenum++;
		submit_filters();
	}
}

function setpagenum( initpage )
{
	pagenum = initpage;
}

function setmaxpages( newmax )
{
	maxpages = newmax;
}

// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }

}

// collapse the menu //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}