var aitpagecache_Loader = Class.create({
	isDataLoaded: false,	
	data: null,
	config : {
		blockClass: 'aitoc-aitpagecache-loadable-block',
		loadingEffectClass: 'aitoc-aitpagecache-loading-effect',
		disabledCacheBlocks: [],
		noCacheFlag: 'noMagentoBoosterCache'
	},
	initialize: function(config) {
		Object.extend(this.config, config);
		document.observe('dom:loaded', this.onDomLoaded.bind(this));	
	},
	onDomLoaded: function() {		
		this.process();
	},
	process: function() {
	
		if (!$$('.' + this.config.blockClass).size()) {
			return;
		}
		
		this.config.disabledCacheBlocks.each(function (blockId) {
			this.addLoadingEffect(this.getPageCacheBlockId(blockId))
		}, this);
			
		new Ajax.Request(this.getNoCacheUrl(this.config.url, this.config.noCacheFlag), {
			method: 'GET',
			onSuccess: function(transport) {
				
				var cntr = new Element('div');
				Element.extend(cntr);				
				cntr.update(transport.responseText);											
				
				this.config.disabledCacheBlocks.each(function (blockId) {					
					var block = $(this.getPageCacheBlockId(blockId));				
					
					if (block)
					{						
						block.replace(cntr.down('#' + block.id).innerHTML);						
						this.removeLoadingEffect(block.id);						
					}					
				}, this);
			}.bind(this),
			onComplete: function(transport) {
				this.config.disabledCacheBlocks.each(function (blockId) {
				this.removeLoadingEffect(this.getPageCacheBlockId(blockId));
				}, this);				
			}
		});		
	},
	addLoadingEffect: function(id)
	{
		var cntr = $(id);	

		if (!cntr)
		{			
			return;
		}
		
		var loadingEffect = new Element('div', {
			'class': this.config.loadingEffectClass,
			'id': this.getLoadingEffectBlockId(id)
		}).setStyle({
			'width': cntr.getWidth() + 'px',
            'height': cntr.getHeight() + 'px',
            'left': this.getLeftPos(cntr) + 'px',
            'top': this.getTopPos(cntr) + 'px'
		});

		$$('body').first().appendChild(loadingEffect);
	},
	removeLoadingEffect: function(id)
	{
		var loadingEffect = $(this.getLoadingEffectBlockId(id));
		
		if (!loadingEffect)
		{
			return;
		}
		
		loadingEffect.remove();
	},
	getLoadingEffectBlockId: function(id)
	{		
		return this.config.loadingEffectClass + '-' + id;
	},
	getPageCacheBlockId: function(id)
	{
		return this.config.blockClass + '-' + id;
	},
	getLeftPos: function(element)
	{
		var valueL = 0;
		try
		{
			do
			{
				valueL += element.offsetLeft || 0;
				element = element.offsetParent;
			} while (element);
		}
		catch( ex ) {			
	}
	return valueL;
	},	
	getTopPos: function(element)
	{
		var valueT = 0;
		try
		{
			do
			{
				valueT += element.offsetTop || 0;
				element = element.offsetParent;
			} while (element);
		}
		catch( ex ) {
	}
	return valueT;
	},
	getNoCacheUrl: function(url, flag)
	{
		var sign = '?';
		if ((url.indexOf('?') > -1) && (url.indexOf('&') > -1))
		{
			sign = '&';
		}
		
		return url + sign + flag;
	}
});