/* Nifty Corners Cube - rounded corners with CSS and Javascript Copyright 2006 Alessandro Fulciniti (a.fulciniti@html.it)

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 St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/* 	Note: Modified for jQuery; removed same-height functionality 
	IE8 fix (http://jhop.me/browsers/ie8/haslayout-true)

	Adds find() method to String.prototype

OPTIONS: 
tl					top left corner
tr					top right corner
bl					bottom left corner
br					bottom right corner
top					upper corners
bottom				lower corners
left					left corners
right				right corners
all (default)		all the four corners
small				small corners (2px)
normal (default)		normal size corners (5px)
big					big size corners (10px)
transparent			inner transparent, alias corners will be obtained. This option activates automatically if the element to round does not have a background-color specified.
*/

// create closure
(function($) {
	$.fn.niftycube = function(options) {	
	
		var CSSpath = '/css/niftyCorners.css'; // path of stylesheet for niftycorners
		
		var CSScheck = $('head link[href$="'+CSSpath+'"]');
		if(CSScheck.length == 0) 
			$('head').append('<link rel="stylesheet" href="'+CSSpath+'" type="text/css" />');
	
		var niftyOk = (document.getElementById && document.createElement && Array.prototype.push);
		
		String.prototype.find=function(what)
		{
			return(this.indexOf(what)>=0 ? true : false);
		};
	
		// round corners on each element using private functions (below) & return elem
		return this.each(function()
		{
			if(niftyOk == false) return;
			if(!options || options == 'undefined' || options == null) options="";
			Rounded(this,options);
		});
	};


// private functions
	function Rounded(e,options)
	{
		var i,top="",bottom="",v=new Array();
		if(options!=""){
			options=options.replace("left","tl bl");
			options=options.replace("right","tr br");
			options=options.replace("top","tr tl");
			options=options.replace("bottom","br bl");
			options=options.replace("transparent","alias");
			if(options.find("tl")){
				top="both";
				if(!options.find("tr")) top="left";
				}
			else if(options.find("tr")) top="right";
			if(options.find("bl")){
				bottom="both";
				if(!options.find("br")) bottom="left";
				}
			else if(options.find("br")) bottom="right";
			}
		if(top=="" && bottom==""){top="both";bottom="both";}
		FixIE(e);
		if(top!="") AddTop(e,top,options);
		if(bottom!="") AddBottom(e,bottom,options);
	};
	
	function AddTop(el,side,options)
	{
		var d=CreateEl("strong"),lim=4,border="",p,i,btype="r",bk,color;
		d.style.marginLeft="-"+getPadding(el,"Left")+"px";
		d.style.marginRight="-"+getPadding(el,"Right")+"px";
		if(options.find("alias") || (color=getBk(el))=="transparent")
			{
				color="transparent";bk="transparent"; border=getParentBk(el);btype="t";
			}
		else
			{
				bk=getParentBk(el); border=Mix(color,bk);
			}
		d.style.background=bk;
		d.className="niftycorners";
		p=getPadding(el,"Top");
		if(options.find("small"))
			{
				d.style.marginBottom=(p-2)+"px";
				btype+="s"; lim=2;
			}
		else if(options.find("big"))
			{
				d.style.marginBottom=(p-10)+"px";
				btype+="strong"; lim=8;
			}
		else d.style.marginBottom=(p-5)+"px";
		for(i=1;i<=lim;i++)
			d.appendChild(CreateStrip(i,side,color,border,btype));
		el.style.paddingTop="0";
		el.insertBefore(d,el.firstChild);
	};
	
	function AddBottom(el,side,options){
		var d=CreateEl("strong"),lim=4,border="",p,i,btype="r",bk,color;
		d.style.marginLeft="-"+getPadding(el,"Left")+"px";
		d.style.marginRight="-"+getPadding(el,"Right")+"px";
		if(options.find("alias") || (color=getBk(el))=="transparent"){
			color="transparent";bk="transparent"; border=getParentBk(el);btype="t";
			}
		else{
			bk=getParentBk(el); border=Mix(color,bk);
			}
		d.style.background=bk;
		d.className="niftycorners";
		p=getPadding(el,"Bottom");
		if(options.find("small")){
			d.style.marginTop=(p-2)+"px";
			btype+="s"; lim=2;
			}
		else if(options.find("big")){
			d.style.marginTop=(p-10)+"px";
			btype+="strong"; lim=8;
			}
		else d.style.marginTop=(p-5)+"px";
		for(i=lim;i>0;i--)
			d.appendChild(CreateStrip(i,side,color,border,btype));
		el.style.paddingBottom=0;
		el.appendChild(d);
		};
		
		function CreateStrip(index,side,color,border,btype){
		var x=CreateEl("strong");
		x.className=btype+index;
		x.style.backgroundColor=color;
		x.style.borderColor=border;
		if(side=="left"){
			x.style.borderRightWidth="0";
			x.style.marginRight="0";
			}
		else if(side=="right"){
			x.style.borderLeftWidth="0";
			x.style.marginLeft="0";
			}
		return(x);
	};
	
	function CreateEl(x){
		return(document.createElement(x));
	};
	
	function FixIE(el){
		if(el.currentStyle!=null && el.currentStyle.hasLayout!=null && el.currentStyle.hasLayout==false)
		//	el.style.display="inline-block";
			el.style.overflow="hidden"; // IE8 fix, layout trigger that doesn't affect initial width computation
	};

	
	function getParentBk(x){
		var el=x.parentNode,c;
		while(el.tagName.toUpperCase()!="HTML" && (c=getBk(el))=="transparent")
			el=el.parentNode;
		if(c=="transparent") c="#FFFFFF";
		return(c);
	};
	
	function getBk(x){
		var c=getStyleProp(x,"backgroundColor");
		if(c==null || c=="transparent" || c.find("rgba(0, 0, 0, 0)"))
			return("transparent");
		if(c.find("rgb")) c=rgb2hex(c);
		return(c);
	};
	
	function getPadding(x,side){
		var p=getStyleProp(x,"padding"+side);
		if(p==null || !p.find("px")) return(0);
		return(parseInt(p));
	};
	
	function getStyleProp(x,prop){
		if(x.currentStyle)
			return(x.currentStyle[prop]);
		if(document.defaultView.getComputedStyle)
			return(document.defaultView.getComputedStyle(x,'')[prop]);
		return(null);
	};
	
	function rgb2hex(value){
		var hex="",v,h,i;
		var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
		var h=regexp.exec(value);
		for(i=1;i<4;i++){
			v=parseInt(h[i]).toString(16);
			if(v.length==1) hex+="0"+v;
			else hex+=v;
			}
		return("#"+hex);
	};
	
	function Mix(c1,c2){
		var i,step1,step2,x,y,r=new Array(3);
		if(c1.length==4)step1=1;
		else step1=2;
		if(c2.length==4) step2=1;
		else step2=2;
		for(i=0;i<3;i++){
			x=parseInt(c1.substr(1+step1*i,step1),16);
			if(step1==1) x=16*x+x;
			y=parseInt(c2.substr(1+step2*i,step2),16);
			if(step2==1) y=16*y+y;
			r[i]=Math.floor((x*50+y*50)/100);
			r[i]=r[i].toString(16);
			if(r[i].length==1) r[i]="0"+r[i];
			}
		return("#"+r[0]+r[1]+r[2]);
	};

})($); // end of closure