/*
* jQuery corner plugin
*
* version 1.92 (12/18/2007)
*
* Dual licensed under the MIT and GPL licenses:
*   http://www.opensource.org/licenses/mit-license.php
*   http://www.gnu.org/licenses/gpl.html
*/

/**
* The corner() method provides a simple way of styling DOM elements.  
*
* corner() takes a single string argument:  $().corner("effect corners width")
*
*   effect:  The name of the effect to apply, such as round or bevel. 
*            If you don't specify an effect, rounding is used.
*
*   corners: The corners can be one or more of top, bottom, tr, tl, br, or bl. 
*            By default, all four corners are adorned. 
*
*   width:   The width specifies the width of the effect; in the case of rounded corners this 
*            will be the radius of the width. 
*            Specify this value using the px suffix such as 10px, and yes it must be pixels.
*
* For more details see: http://methvin.com/jquery/jq-corner.html
* For a full demo see:  http://malsup.com/jquery/corner/
*
*
* @example $('.adorn').corner();
* @desc Create round, 10px corners 
*
* @example $('.adorn').corner("25px");
* @desc Create round, 25px corners 
*
* @example $('.adorn').corner("notch bottom");
* @desc Create notched, 10px corners on bottom only
*
* @example $('.adorn').corner("tr dog 25px");
* @desc Create dogeared, 25px corner on the top-right corner only
*
* @example $('.adorn').corner("round 8px").parent().css('padding', '4px').corner("round 10px");
* @desc Create a rounded border effect by styling both the element and its parent
* 
* @name corner
* @type jQuery
* @param String options Options which control the corner style
* @cat Plugins/Corner
* @return jQuery
* @author Dave Methvin (dave.methvin@gmail.com)
* @author Mike Alsup (malsup@gmail.com)
*/
(function($) {

	$.fn.corner = function(o) {
		var ie6 = $.browser.msie && /MSIE 6.0/.test(navigator.userAgent);
		function sz(el, p) { return parseInt($.css(el, p)) || 0; };
		function hex2(s) {
			var s = parseInt(s).toString(16);
			return (s.length < 2) ? '0' + s : s;
		};
		function gpc(node) {
			for (; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode) {
				var v = $.css(node, 'backgroundColor');
				if (v.indexOf('rgb') >= 0) {
					if ($.browser.safari && v == 'rgba(0, 0, 0, 0)')
						continue;
					var rgb = v.match(/\d+/g);
					return '#' + hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
				}
				if (v && v != 'transparent')
					return v;
			}
			return '#ffffff';
		};
		function getW(i) {
			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 '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 'bevel': return i + 1;
			}
		};
		o = (o || "").toLowerCase();
		var keep = /keep/.test(o);                       // keep borders?
		var cc = ((o.match(/cc:(#[0-9a-f]+)/) || [])[1]);  // corner color
		var sc = ((o.match(/sc:(#[0-9a-f]+)/) || [])[1]);  // strip color
		var width = parseInt((o.match(/(\d+)px/) || [])[1]) || 10; // corner width
		var re = /round|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dog/;
		var fx = ((o.match(re) || ['round'])[0]);
		var edges = { T: 0, B: 1 };
		var opts = {
			TL: /top|tl/.test(o), TR: /top|tr/.test(o),
			BL: /bottom|bl/.test(o), BR: /bottom|br/.test(o)
		};
		if (!opts.TL && !opts.TR && !opts.BL && !opts.BR)
			opts = { TL: 1, TR: 1, BL: 1, BR: 1 };
		var strip = document.createElement('div');
		strip.style.overflow = 'hidden';
		strip.style.height = '1px';
		strip.style.backgroundColor = sc || 'transparent';
		strip.style.borderStyle = 'solid';
		return this.each(function(index) {
			var 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 ($.browser.msie) this.style.zoom = 1; // force 'hasLayout' in IE
			if (!keep) this.style.border = 'none';
			strip.style.borderColor = cc || gpc(this.parentNode);
			var cssHeight = $.curCSS(this, 'height');

			for (var j in edges) {
				var 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');
					var d = document.createElement('div');
					$(d).addClass('jquery-corner');
					var ds = d.style;

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

					if (bot && cssHeight != 'auto') {
						if ($.css(this, 'position') == 'static')
							this.style.position = 'relative';
						ds.position = 'absolute';
						ds.bottom = ds.left = ds.padding = ds.margin = '0';
						if ($.browser.msie)
							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
						var bw = 0;
						if (ie6 || !$.boxModel)
							bw = sz(this, 'borderLeftWidth') + sz(this, 'borderRightWidth');
						ie6 ? ds.setExpression('width', 'this.parentNode.offsetWidth - ' + bw + '+ "px"') : ds.width = '100%';
					}
					else {
						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 (var i = 0; i < width; i++) {
						var w = Math.max(0, getW(i));
						var 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);
					}
				}
			}
		});
	};

	$.fn.uncorner = function(o) { return $('.jquery-corner', this).remove(); };

})(jQuery);