var content;
var scrollIndexItem = 1;
var scrollIndexDirection = 1;
var scrollIndexFreeze = 0;
var scrollFooterItem = 0;
var footerIndexFreeze = 0;

	function setContentSize() 
	{
		var ch = content.offsetHeight;
		var tch = window.innerHeight;
		if (!tch) tch = document.documentElement.offsetHeight;
		tch -= 312; // 110 + 162
		if (ch<tch) content.style.height = tch + "px";
	}


	function scrollIndexLeft()
	{		
		if (scrollIndexItem<=1) return false;
		scrollIndexItem--;
		scrollToItem(scrollIndexItem);
		return true;
		
	}
	
	function scrollIndexRight()
	{
		if (scrollIndexItem>=3) return false;
		scrollIndexItem++;
		scrollToItem(scrollIndexItem);
		return true;
	}
	
	function scrollToItem(item)
	{
		scrollIndexItem = item;
		
		$('#content_index_scroll').animate({left: (item-1)*-580}, 'slow');
		
		for (var i=1; i<4; i++) document.getElementById('content_index_item_'+i).src="images/content_index_presto_b"+i+".png";
		
		document.getElementById('content_index_item_'+item).src="images/content_index_presto_c"+item+".png";
	}
	
	function autoIndexScroll()
	{	
		if (scrollIndexFreeze) 
		{
			scrollIndexFreeze--; 
			return;
		}
		
		if (scrollIndexDirection==1)
			if (!scrollIndexRight()) 
			{
				scrollIndexDirection*=-1;
			}

		if (scrollIndexDirection==-1)
			if (!scrollIndexLeft()) 
			{
				scrollIndexDirection*=-1;
			}
	}
	
	function freezeIndexScroll()
	{
		scrollIndexFreeze = 3;
	}
	
	function fadeInItemLogo(item)
	{
		//console.log($('#content_index_item_'+item), $('#content_index_item_logo_'+item));
		$('#content_index_item_'+item).fadeTo('slow',0);
		$('#content_index_item_logo_'+item).fadeTo('slow',1);
	}
	
	function fadeOutItemLogo(item)
	{
		$('#content_index_item_'+item).fadeTo('slow',1);
		$('#content_index_item_logo_'+item).fadeTo('slow',0);
	}
	
	function footerLogoScroll()
	{
		if (footerIndexFreeze>0)
		{	
			footerIndexFreeze--;
			return;
		}
		
		scrollFooterItem++;
		$('#footer_scroll').animate({left: -scrollFooterItem*125}, 'slow');		
		if (scrollFooterItem>6) scrollFooterItem=0;
	}
	
	function footerLogoScrollLeft()
	{
		if (scrollFooterItem<=0) return;
		scrollFooterItem--;
		$('#footer_scroll').animate({left: -scrollFooterItem*125}, 'slow');
		footerIndexFreeze = 3;
	}
	
	function footerLogoScrollRight()
	{
		if (scrollFooterItem>6) return;
		scrollFooterItem++;
		$('#footer_scroll').animate({left: -scrollFooterItem*125}, 'slow');
		footerIndexFreeze = 3;
	}	
	
	function footerLogoColor(logo)
	{
		var i = logo.id.split('_')[2];
		logo.src = "images/logo/"+i+"a.png";
	}

	function footerLogoGray(logo)
	{
		var i = logo.id.split('_')[2];
		logo.src = "images/logo/"+i+".png";
	}	
	
	function contentUp()
	{
		scrollTo(0,0);
	}

	function swapNodes(a, b) {
		var aparent= a.parentNode;
		var asibling= a.nextSibling===b? a : a.nextSibling;
		b.parentNode.insertBefore(a, b);
		aparent.insertBefore(b, asibling);
	}

	function footerLogoRandomize()
	{
		var fs = document.getElementById('footer_scroll');
		var imgs = fs.getElementsByTagName('img');
		
		var l = imgs.length;
		
		var ic=10;
		var i1, i2;
		
		while (ic)
		{
			imgs = fs.getElementsByTagName('img');
			i1 = Math.floor(Math.random()*l);
			i2 = Math.floor(Math.random()*l);
			if (i1==i2) continue;
			ic--;
			swapNodes(imgs[i1], imgs[i2]);
		}
		
		fs.style.visibility = 'visible';
	}
	
	// po załadowaniu htmla, uruchamiamy sprawdzanie rozmiaru dokumentu, następnie włączamy dostępne scrolle
	$(document).ready(function(){
		content = document.getElementById("content");
		setContentSize(); 
		setInterval(setContentSize, 1000);
		
		if (document.getElementById("content_index_scroll"))
		{
			setInterval("autoIndexScroll()", 5000);
		}
		
		footerLogoRandomize();
		setInterval("footerLogoScroll()", 4000);
		
		
		// i ukrywamy loga w index.html
		$('#content_index_item_logo_1').fadeTo(0,0);
		$('#content_index_item_logo_2').fadeTo(0,0);
		$('#content_index_item_logo_3').fadeTo(0,0);
		//$('#content_index_item_logo_4').fadeTo(0,0);
		
		var ciil = document.getElementById('content_index_items_logos');
		if (ciil)  ciil.style.visibility = "visible";
	});
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