// JavaScript Document

var jsEffects = {

	queue : {},
	originalParams : {},
	
	// Nastaveni stylu
	setStyle : function(elm, key, value) { elm.style[key] = value; },
	
	// nastavi prulednost
	setOpacity : function (elm, op)
	{
	   elm.style.opacity = op;
	   elm.style.MozOpacity = op;
	   elm.style.filter = 'Alpha(opacity='+(op * 100)+')';
	},

	// zmeni pruhlednost
	changeOpacity : function (elm, inc)
	{
	   var newOp = U.getFloat(elm.style.opacity) + inc;

	   elm.style.opacity = newOp;
	   elm.style.MozOpacity = newOp;
	   elm.style.filter = 'Alpha(opacity='+(newOp * 100)+')';
	},
	
	// zmeni rozmer
	changeSize : function (elm, dimension, inc, metric)
	{
	   metric = !metric ? 'px' : metric;
		elm.style[dimension] = (U.getInt(elm.style[dimension]) + inc) + metric;
	},

	// zmeni pozici
	changeOffset : function (elm, side, inc, metric)
	{
	   metric = !metric ? 'px' : metric;
	   elm.style[side] = (U.getInt(elm.style[side]) + inc) + metric;
	},

	// testuje, je-li efekt ve fronte
	inQueue : function (elmUniqueId, effectName)
	{
	   if(typeof(this.queue[elmUniqueId]) != 'undefined')
	   {
	      return this.queue[elmUniqueId].effect == effectName;
	   }
	   else
	   {
			return false;
	   }
	},
	
	// zrusi efekt
	cancleEffect : function(uId, callback, effect)
	{
	   try {
			Interval.remove(uId + effect);
			delete this.queue[uId];
			if(callback)
				eval(callback);
		} catch(e) {}
	},
	
	
	// opona
	Curtain : {

		curtainIds : new Array(),
	   
	   create : function(color, parent, settings)
	   {
			var elm = document.createElement('DIV');

			var inc = 0;
			if(!parent) parent = document.body;
		
			parent.appendChild(elm);
			
			if(!color) color = 'black';

			if(settings == null) settings = {};
			if(typeof(settings['left']) == 'undefined') settings['left'] = 0;
			if(typeof(settings['top']) == 'undefined') settings['top'] = 0;
			if(typeof(settings['alpha']) == 'undefined') settings['alpha'] = 0.95;

			elm.id = uId(elm);
			jsEffects.Curtain.curtainIds.unshift(uId(elm));
			elm.style.position = parent == document.body ? 'fixed' : 'absolute';
			elm.style.left = settings.left + 'px';
			elm.style.top = settings.top + 'px';
			elm.style.backgroundColor = color;
			elm.style.zIndex = 1000;

			width = $(parent).width();
			height = $(parent).height();
			
			if(parent == document.body)
			{
			   width = width < $(window).width() ? $(window).width() : width;
				height = height < $(window).height() ? $(window).height() : height;
   		}
   	
			elm.style.width = width + 'px';
			elm.style.height = height + 'px';
			
			jsEffects.setOpacity(elm, 0);
			jsEffects.fadeIn(elm.id, {speed: 5, inc: 0.3, target: settings['alpha'] });
	   },

		destroy : function()
		{
		   if(jsEffects.Curtain.curtainIds.length)
			{
				var tmpId = jsEffects.Curtain.curtainIds.shift();
				var cl = '$$(\''+tmpId+'\').parentNode.removeChild($$(\''+tmpId+'\'));';

				jsEffects.fadeOut(tmpId, {speed: 5, inc: 0.3, callback: cl });
			   return true;
			}
			
			return null;
		},
		
		getId : function()
		{
		   return jsEffects.Curtain.curtainIds[0];
		},
		
		updateSize : function(parent, modW, modH)
		{
		   var tmpId = this.getId();
		   modW = modW ? modW : 0;
		   modH = modH ? modH : 0;
					   
			width = $(parent).width() + modW;
			height = $(parent).height() + modH;
				
			$$(tmpId).style.width = width + 'px';
			$$(tmpId).style.height = height + 'px';
		}
	},
	
	// necha objevit element
	fadeIn : function (elmId, settings, inProcess)
	{
		var elm = $$(elmId);
		
		var inc = typeof settings.inc != 'undefined' ? settings.inc : 0.01;
		var speed = typeof settings.speed != 'undefined' ? settings.speed : 5;
		var target = typeof settings.target != 'undefined' ? settings.target : 1;
		var callback = typeof settings.callback != 'undefined' ? settings.callback : null;

		if(!inProcess)
		{
			if(this.inQueue(uId(elm), 'fadeOut')) this.cancleEffect(uId(elm), null, 'FadeOut');

			if(!this.inQueue(uId(elm), 'fadeIn'))
			{
			   this.queue[uId(elm)] = {
			      effect : 'fadeIn',
					interval : null
			   };

				var sett = '{ inc : '+inc+', speed : '+speed+', callback : "'+callback+'", target : '+target+' }';
			   //this.queue[uId(elm)].interval = window.setInterval('jsEffects.fadeIn("'+elmId+'", '+sett+', true)', speed);
			   Interval.add(uId(elm)+'FadeIn', 'jsEffects.fadeIn("'+elmId+'", '+sett+', true)', 1);
			}
			else
			{
			   return;
			}
		}
		else
		{
		   try
			{
			   if(U.getFloat(elm.style.opacity) + inc >= target)
			   {
					this.setOpacity(elm, target);
					this.cancleEffect(uId(elm), callback, 'FadeIn');
				}
				else
				{
				  	this.changeOpacity(elm, inc);
				}
			} catch(e){	}
		}
	},
	
	// necha zmizet element
	fadeOut : function (elmId, settings, inProcess)
	{
		var elm = $$(elmId);

  		var inc = typeof settings.inc != 'undefined' ? settings.inc : 0.01;
		var speed = typeof settings.speed != 'undefined' ? settings.speed : 5;
		var target = typeof settings.target != 'undefined' ? settings.target : 0;
		var callback = typeof settings.callback != 'undefined' ? settings.callback : null;

		if(!inProcess)
		{
			if(this.inQueue(uId(elm), 'fadeIn')) this.cancleEffect(uId(elm), null, 'FadeIn');

			if(!this.inQueue(uId(elm), 'fadeOut'))
			{
			   this.queue[uId(elm)] = {
			      effect : 'fadeOut',
					interval : null
			   };

			   var op = parseFloat(elm.style.opacity);
			   op = isNaN(op) ? 1 : op;
		      this.setOpacity(elm, op);

				var sett = '{ inc : '+inc+', speed : '+speed+', callback : "'+callback+'", target : '+target+' }';
			   Interval.add(uId(elm)+'FadeOut', 'jsEffects.fadeOut("'+elmId+'", '+sett+', true)', 1);
			}
			else
			{
			   return;
			}
		}
		else
		{
		   if(U.getFloat(elm.style.opacity) - inc <= target)
		   {
				this.setOpacity(elm, target);
				this.cancleEffect(uId(elm), callback, 'FadeOut');
			}
			else
			{
			  	this.changeOpacity(elm, -inc);
			}
		}
	},
	
	end : null
}