/*
 * CrossSlide jQuery plugin v0.6
 *
 * Copyright 2007-2010 by Tobia Conforto <tobia.conforto@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
(function() {
	var d=jQuery,
		a=(d.fn.startAnimation?"startAnimation":"animate"),
		c="pause plugin missing.";
	
	function e(h){
		for(var g=1;g<arguments.length;g++){
			h=h.replace(new RegExp("\\{"+(g-1)+"}","g"),arguments[g])
		}
		return h
	}
	
	function f(){
		arguments[0]="CrossSlide: "+arguments[0];
		throw new Error(e.apply(null,arguments))
	}
	
	function b(i){
		var g=1;
		var h=i.replace(/^\s*|\s*$/g,"").split(/\s+/);
		if(h.length>3){
			throw new Error()
		}
		
		if(h[0]=="center"){
			if(h.length==1){
				h=["center","center"]
			} else {
				if(h.length==2&&h[1].match(/^[\d.]+x$/i)){
					h=["center","center",h[1]]
				}
			}
		}
		
		if(h.length==3){
			g=parseFloat(h[2].match(/^([\d.]+)x$/i)[1])
		}
		
		var j=h[0]+" "+h[1];
		
		if(j=="left top"||j=="top left"){	return{xrel:0,yrel:0,zoom:g}	}
		
		if(j=="left center"||j=="center left"){	return{xrel:0,yrel:0.5,zoom:g}	}
		
		if(j=="left bottom"||j=="bottom left"){	return{xrel:0,yrel:1,zoom:g}	}
		
		if(j=="center top"||j=="top center"){	return{xrel:0.5,yrel:0,zoom:g}	}
		
		if(j=="center center"){	return{xrel:0.5,yrel:0.5,zoom:g}	}
		
		if(j=="center bottom"||j=="bottom center"){	return{xrel:0.5,yrel:1,zoom:g}	}
		
		if(j=="right top"||j=="top right"){	return{xrel:1,yrel:0,zoom:g}	}
		
		if(j=="right center"||j=="center right"){	return{xrel:1,yrel:0.5,zoom:g}	}
		
		if(j=="right bottom"||j=="bottom right"){	return{xrel:1,yrel:1,zoom:g}	}
		
		return{xrel:parseInt(h[0].match(/^(\d+)%$/)[1])/100,yrel:parseInt(h[1].match(/^(\d+)%$/)[1])/100,zoom:g}
	}
	
	d.fn.crossSlide=function(i,k,l){
		var g=this,
			j=this.width(),
			h=this.height();
		
		if(g.length!=1){
			f("crossSlide() must be called on exactly 1 element")
		}
		
		g.get(0).crossSlideArgs=[i,k,l];
		k=d.map(k,function(m){
			return d.extend({},m)
		});
		
		if(!i.easing){
			i.easing=i.variant?"swing":"linear"
		}
		
		if(!l){
			l=function(){}
		}(function(o){
			var m=0;
			function n(q,p){
				p.onload=function(r){
					m++;
					k[q].width=p.width;
					k[q].height=p.height;
					if(m==k.length){	o()	}
				};
				p.src=k[q].src;
				
				if(q+1<k.length){
					n(q+1,new Image())
				}
			}
			
			n(0,new Image())
		})(function(){
			if(!i.fade){
				f("missing fade parameter.")
			}
			
			if(i.speed&&i.sleep){
				f("you cannot set both speed and sleep at the same time.")
			}
			
			var A=Math.round(i.fade*1000);
			if(i.sleep){
				var z=Math.round(i.sleep*1000)
			}
			
			if(i.speed){
				var o=i.speed/1000,v=Math.round(A*o)
			}
			
			g.empty().css({overflow:"hidden",padding:0});
			
			if(!/^(absolute|relative|fixed)$/.test(g.css("position"))){
				g.css({position:"relative"})
			}
			
			if(!g.width()||!g.height()){
				f("container element does not have its own width and height")
			}
			
			if(i.shuffle){
				k.sort(function(){
					return Math.random()-0.5
				})
			}
			
			for(var t=0;t<k.length;++t){
				var m=k[t];
				if(!m.src){
					f("missing src parameter in picture {0}.",t+1)
				}
				
				if(o){
					switch(m.dir){
						case"up":	m.from={xrel:0.5,yrel:0,zoom:1};
									m.to={xrel:0.5,yrel:1,zoom:1};
									var x=m.height-h-2*v;	break;
						case"down":	m.from={xrel:0.5,yrel:1,zoom:1};
									m.to={xrel:0.5,yrel:0,zoom:1};
									var x=m.height-h-2*v;	break;
						case"left":	m.from={xrel:0,yrel:0.5,zoom:1};
									m.to={xrel:1,yrel:0.5,zoom:1};
									var x=m.width-j-2*v;	break;
						case"right":m.from={xrel:1,yrel:0.5,zoom:1};
									m.to={xrel:0,yrel:0.5,zoom:1};
									var x=m.width-j-2*v;	break;
						default:	f("missing or malformed dir parameter in picture {0}.",t+1)
					}
					
					if(x<=0){
						f("impossible animation: either picture {0} is too small or div is too large or fade duration too long.",t+1)
					}
					
					m.time_ms=Math.round(x/o)
				}else{
					if(!z){
						if(!m.from||!m.to||!m.time){
							f("missing either speed/sleep option, or from/to/time params in picture {0}.",t+1)
						}
						
						try{	m.from=b(m.from)	}
						catch(w){	f('malformed "from" parameter in picture {0}.',t+1)	}
						try{	m.to=b(m.to)	}
						catch(w){	f('malformed "to" parameter in picture {0}.',t+1)	}
						
						if(!m.time){
							f('missing "time" parameter in picture {0}.',t+1)
						}
						
						m.time_ms=Math.round(m.time*1000)
					}
				}
				
				if(m.from){
					d.each([m.from,m.to],function(p,C){
						C.width=Math.round(m.width*C.zoom);
						C.height=Math.round(m.height*C.zoom);
						C.left=Math.round((j-C.width)*C.xrel);
						C.top=Math.round((h-C.height)*C.yrel)
					})
				}
				
				var s,y;
				y=s=d(e('<img src="{0}"/>',m.src));
				
				if(m.href){
					y=d(e('<a href="{0}"></a>',m.href)).append(s)
				}
				
				if(m.onclick){
					y.click(m.onclick)
				}
				
				if(m.alt){
					s.attr("alt",m.alt)
				}
				
				if(m.href&&m.target){
					y.attr("target",m.target)
				}
				
				y.appendTo(g)
			}
			
			delete o;
			
			function n(D,C){
				var E=[0,A/(D.time_ms+2*A),1-A/(D.time_ms+2*A),1][C];
				return{	
					left:	Math.round(D.from.left+E*(D.to.left-D.from.left)),
					top:	Math.round(D.from.top+E*(D.to.top-D.from.top)),
					width:	Math.round(D.from.width+E*(D.to.width-D.from.width)),
					height:	Math.round(D.from.height+E*(D.to.height-D.from.height))
				}
			}
			
			var u=g.find("img").css({position:"absolute",visibility:"hidden",top:0,left:0,border:0});
			u.eq(0).css({visibility:"visible"});
			
			if(!z){
				u.eq(0).css(n(k[0],i.variant?0:1))
			}
			
			var B=i.loop;
			
			function q(O,p){
				if(O%2==0){
					if(z){
						var E=O/2,
							S=(E-1+k.length)%k.length,
							P=u.eq(E),
							M=u.eq(S);
						var L=function(){
							l(E,P.get(0));
							M.css("visibility","hidden");
							setTimeout(p,z)
						}
					}else{
						var H=O/2,
							S=(H-1+k.length)%k.length,
							R=u.eq(H),
							M=u.eq(S),
							F=k[H].time_ms,
							N=n(k[H],i.variant?3:2);
						var L=function(){
							l(H,R.get(0));
							M.css("visibility","hidden");
							R[a](N,F,i.easing,p)
						}
					}
				}else{
					var D=Math.floor(O/2),
						G=Math.ceil(O/2)%k.length,
						Q=u.eq(D),
						C=u.eq(G),
						T={},
						K={visibility:"visible"},
						J={};
					if(G>D){
						K.opacity=0;
						J.opacity=1;
						if(i.doubleFade){
							T.opacity=0
						}
					}else{
						T.opacity=0;
						if(i.doubleFade){
							K.opacity=0;
							J.opacity=1
						}
					}
					
					if(!z){
						d.extend(K,n(k[G],0));
						if(!i.variant){
							d.extend(T,n(k[D],3));
							d.extend(J,n(k[G],1))
						}
					}
					
					if(d.isEmptyObject(J)){
						var L=function(){
							l(G,C.get(0),D,Q.get(0));
							C.css(K);
							Q[a](T,A,"linear",p)
						}
					}else{
						if(d.isEmptyObject(T)){
							var L=function(){
								l(G,C.get(0),D,Q.get(0));
								C.css(K);
								C[a](J,A,"linear",p)
							}
						}else{
							var L=function(){
								l(G,C.get(0),D,Q.get(0));
								C.css(K);
								C[a](J,A,"linear");
								Q[a](T,A,"linear",p)
							}
						}
					}
				}
				
				if(i.loop&&O==k.length*2-2){
					var I=L;L=function(){
						if(--B){	I()		}
					}
				}
				
				if(O>0){	return q(O-1,L)	}
				else{	return L	}
			}
			
			var r=q(k.length*2-1,function(){
				return r()
			});
			
			r()
		});
		
		return g
	};
	
	d.fn.crossSlideFreeze=function(){
		this.find("img").stop()
	};
	
	d.fn.crossSlideStop=function(){
		this.find("img").stop().remove()
	};
	
	d.fn.crossSlideRestart=function(){
		this.find("img").stop().remove();
		d.fn.crossSlide.apply(this,this.get(0).crossSlideArgs)
	};
	
	d.fn.crossSlidePause=function(){
		if(!d.fn.pause){	f(c)	}
		this.find("img").pause()
	};
	
	d.fn.crossSlideResume=function(){
		if(!d.fn.pause){	f(c)	}
		this.find("img").resume()
	}
})();