/*!
 * jQuery corner plugin: simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 * version 2.11 (15-JUN-2010)
 * Requires jQuery v1.3.2 or later
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 * Authors: Dave Methvin and Mike Alsup
 */

/**
 *  corner() takes a single string argument:  $('#myDiv').corner("effect corners width")
 *
 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 
 *  corners: one or more of: top, bottom, tr, tl, br, or bl.  (default is all corners)
 *  width:   width of the effect; in the case of rounded corners this is the radius. 
 *           specify this value using the px suffix such as 10px (yes, it must be pixels).
 */
;(function($) { 

var style = document.createElement('div').style,
	moz = style['MozBorderRadius'] !== undefined,
	webkit = style['WebkitBorderRadius'] !== undefined,
	radius = style['borderRadius'] !== undefined || style['BorderRadius'] !== undefined,
	mode = document.documentMode || 0,
	noBottomFold = $.browser.msie && (($.browser.version < 8 && !mode) || mode < 8),

	expr = $.browser.msie && (function() {
		var div = document.createElement('div');
		try { div.style.setExpression('width','0+0'); div.style.removeExpression('width'); }
		catch(e) { return false; }
		return true;
	})();

$.support = $.support || {};
$.support.borderRadius = moz || webkit || radius; // so you can do:  if (!$.support.borderRadius) $('#myDiv').corner();

function sz(el, p) { 
	return parseInt($.css(el,p))||0; 
};
function hex2(s) {
	var s = parseInt(s).toString(16);
	return ( s.length < 2 ) ? '0'+s : s;
};
function gpc(node) {
	while(node) {
		var v = $.css(node,'backgroundColor'), rgb;
		if (v && v != 'transparent' && v != 'rgba(0, 0, 0, 0)') {
			if (v.indexOf('rgb') >= 0) { 
				rgb = v.match(/\d+/g); 
				return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
			}
			return v;
		}
		if (node.nodeName.toLowerCase() == 'html')
			break;
		node = node.parentNode; // keep walking if transparent
	}
	return '#ffffff';
};

function getWidth(fx, i, width) {
	switch(fx) {
	case 'round':  return Math.round(width*(1-Math.cos(Math.asin(i/width))));
	case 'cool':   return Math.round(width*(1+Math.cos(Math.asin(i/width))));
	case 'sharp':  return Math.round(width*(1-Math.cos(Math.acos(i/width))));
	case 'bite':   return Math.round(width*(Math.cos(Math.asin((width-i-1)/width))));
	case 'slide':  return Math.round(width*(Math.atan2(i,width/i)));
	case 'jut':    return Math.round(width*(Math.atan2(width,(width-i-1))));
	case 'curl':   return Math.round(width*(Math.atan(i)));
	case 'tear':   return Math.round(width*(Math.cos(i)));
	case 'wicked': return Math.round(width*(Math.tan(i)));
	case 'long':   return Math.round(width*(Math.sqrt(i)));
	case 'sculpt': return Math.round(width*(Math.log((width-i-1),width)));
	case 'dogfold':
	case 'dog':    return (i&1) ? (i+1) : width;
	case 'dog2':   return (i&2) ? (i+1) : width;
	case 'dog3':   return (i&3) ? (i+1) : width;
	case 'fray':   return (i%2)*width;
	case 'notch':  return width; 
	case 'bevelfold':
	case 'bevel':  return i+1;
	}
};

$.fn.corner = function(options) {
	// in 1.3+ we can fix mistakes with the ready state
	if (this.length == 0) {
		if (!$.isReady && this.selector) {
			var s = this.selector, c = this.context;
			$(function() {
				$(s,c).corner(options);
			});
		}
		return this;
	}

	return this.each(function(index){
		var $this = $(this),
			// meta values override options
			o = [$this.attr($.fn.corner.defaults.metaAttr) || '', options || ''].join(' ').toLowerCase(),
			keep = /keep/.test(o),                       // keep borders?
			cc = ((o.match(/cc:(#[0-9a-f]+)/)||[])[1]),  // corner color
			sc = ((o.match(/sc:(#[0-9a-f]+)/)||[])[1]),  // strip color
			width = parseInt((o.match(/(\d+)px/)||[])[1]) || 10, // corner width
			re = /round|bevelfold|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dogfold|dog/,
			fx = ((o.match(re)||['round'])[0]),
			fold = /dogfold|bevelfold/.test(o),
			edges = { T:0, B:1 },
			opts = {
				TL:  /top|tl|left/.test(o),       TR:  /top|tr|right/.test(o),
				BL:  /bottom|bl|left/.test(o),    BR:  /bottom|br|right/.test(o)
			},
			// vars used in func later
			strip, pad, cssHeight, j, bot, d, ds, bw, i, w, e, c, common, $horz;

		if ( !opts.TL && !opts.TR && !opts.BL && !opts.BR )
			opts = { TL:1, TR:1, BL:1, BR:1 };

		// support native rounding
		if ($.fn.corner.defaults.useNative && fx == 'round' && (radius || moz || webkit) && !cc && !sc) {
			if (opts.TL)
				$this.css(radius ? 'border-top-left-radius' : moz ? '-moz-border-radius-topleft' : '-webkit-border-top-left-radius', width + 'px');
			if (opts.TR)
				$this.css(radius ? 'border-top-right-radius' : moz ? '-moz-border-radius-topright' : '-webkit-border-top-right-radius', width + 'px');
			if (opts.BL)
				$this.css(radius ? 'border-bottom-left-radius' : moz ? '-moz-border-radius-bottomleft' : '-webkit-border-bottom-left-radius', width + 'px');
			if (opts.BR)
				$this.css(radius ? 'border-bottom-right-radius' : moz ? '-moz-border-radius-bottomright' : '-webkit-border-bottom-right-radius', width + 'px');
			return;
		}

		strip = document.createElement('div');
		$(strip).css({
			overflow: 'hidden',
			height: '1px',
			minHeight: '1px',
			fontSize: '1px',
			backgroundColor: sc || 'transparent',
			borderStyle: 'solid'
		});

		pad = {
			T: parseInt($.css(this,'paddingTop'))||0,     R: parseInt($.css(this,'paddingRight'))||0,
			B: parseInt($.css(this,'paddingBottom'))||0,  L: parseInt($.css(this,'paddingLeft'))||0
		};

		if (typeof this.style.zoom != undefined) this.style.zoom = 1; // force 'hasLayout' in IE
		if (!keep) this.style.border = 'none';
		strip.style.borderColor = cc || gpc(this.parentNode);
		cssHeight = $(this).outerHeight();

		for (j in edges) {
			bot = edges[j];
			// only add stips if needed
			if ((bot && (opts.BL || opts.BR)) || (!bot && (opts.TL || opts.TR))) {
				strip.style.borderStyle = 'none '+(opts[j+'R']?'solid':'none')+' none '+(opts[j+'L']?'solid':'none');
				d = document.createElement('div');
				$(d).addClass('jquery-corner');
				ds = d.style;

				bot ? this.appendChild(d) : this.insertBefore(d, this.firstChild);

				if (bot && cssHeight != 'auto') {
					if ($.css(this,'position') == 'static')
						this.style.position = 'relative';
					ds.position = 'absolute';
					ds.bottom = ds.left = ds.padding = ds.margin = '0';
					if (expr)
						ds.setExpression('width', 'this.parentNode.offsetWidth');
					else
						ds.width = '100%';
				}
				else if (!bot && $.browser.msie) {
					if ($.css(this,'position') == 'static')
						this.style.position = 'relative';
					ds.position = 'absolute';
					ds.top = ds.left = ds.right = ds.padding = ds.margin = '0';

					// fix ie6 problem when blocked element has a border width
					if (expr) {
						bw = sz(this,'borderLeftWidth') + sz(this,'borderRightWidth');
						ds.setExpression('width', 'this.parentNode.offsetWidth - '+bw+'+ "px"');
					}
					else
						ds.width = '100%';
				}
				else {
					ds.position = 'relative';
					ds.margin = !bot ? '-'+pad.T+'px -'+pad.R+'px '+(pad.T-width)+'px -'+pad.L+'px' : 
										(pad.B-width)+'px -'+pad.R+'px -'+pad.B+'px -'+pad.L+'px';                
				}

				for (i=0; i < width; i++) {
					w = Math.max(0,getWidth(fx,i, width));
					e = strip.cloneNode(false);
					e.style.borderWidth = '0 '+(opts[j+'R']?w:0)+'px 0 '+(opts[j+'L']?w:0)+'px';
					bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
				}

				if (fold && $.support.boxModel) {
					if (bot && noBottomFold) continue;
					for (c in opts) {
						if (!opts[c]) continue;
						if (bot && (c == 'TL' || c == 'TR')) continue;
						if (!bot && (c == 'BL' || c == 'BR')) continue;

						common = { position: 'absolute', border: 'none', margin: 0, padding: 0, overflow: 'hidden', backgroundColor: strip.style.borderColor };
						$horz = $('<div/>').css(common).css({ width: width + 'px', height: '1px' });
						switch(c) {
						case 'TL': $horz.css({ bottom: 0, left: 0 }); break;
						case 'TR': $horz.css({ bottom: 0, right: 0 }); break;
						case 'BL': $horz.css({ top: 0, left: 0 }); break;
						case 'BR': $horz.css({ top: 0, right: 0 }); break;
						}
						d.appendChild($horz[0]);

						var $vert = $('<div/>').css(common).css({ top: 0, bottom: 0, width: '1px', height: width + 'px' });
						switch(c) {
						case 'TL': $vert.css({ left: width }); break;
						case 'TR': $vert.css({ right: width }); break;
						case 'BL': $vert.css({ left: width }); break;
						case 'BR': $vert.css({ right: width }); break;
						}
						d.appendChild($vert[0]);
					}
				}
			}
		}
	});
};

$.fn.uncorner = function() { 
	if (radius || moz || webkit)
		this.css(radius ? 'border-radius' : moz ? '-moz-border-radius' : '-webkit-border-radius', 0);
	$('div.jquery-corner', this).remove();
	return this;
};

// expose options
$.fn.corner.defaults = {
	useNative: true, // true if plugin should attempt to use native browser support for border radius rounding
	metaAttr:  'data-corner' // name of meta attribute to use for options
};

})(jQuery);