/*!
* jQuery corner plugin: simple corner rounding
* Examples and documentation at: http://jquery.malsup.com/corner/
* version 2.12 (23-MAY-2011)
* 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) {
		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 width-i;
			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;
			case 'steep':
				return i/2 + 1;
			case 'invsteep':
				return (width-i)/2+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|invsteep|steep/,
			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);