/*
 * Prototype/Scriptaculous corner plugin version 0.1 (6/29/2007)
 *
 * Based on the jQuery corner plugin version 1.7 (1/26/2007)
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

/**
 * The Effect.Corner class provides a simple way of styling DOM elements.  
 *
 * Effect.Corner constructor takes two arguments:  new Effect.Corner(element, "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 new Effect.Corner(element);
 * @desc Create round, 10px corners 
 *
 * @example new Effect.Corner(element, "25px");
 * @desc Create round, 25px corners 
 *
 * @name corner
 * @type scriptaculous
 * @author Ilia Lobsanov (first name @ last name dot com)
 */

Effect.Corner = Class.create();

Object.extend(Object.extend(Effect.Corner.prototype, Effect.Base.prototype), {

	hex2: function (s) {
		var s = parseInt(s).toString(16);
		return ( s.length < 2 ) ? '0' + s : s;
	},

	gpc: function (node) {
		for ( ; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode  ) {
			var v = Element.getStyle(node, 'backgroundColor');
			if ( v.indexOf('rgb') >= 0 ) {
				rgb = v.match(/\d+/g);
				return '#' + this.hex2(rgb[0]) + this.hex2(rgb[1]) + this.hex2(rgb[2]);
			}
			if ( v && v != 'transparent' ) return v;
		}
		return '#ffffff';
	},


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

	initialize: function(element, o) {
		
		element = $(element);
		
		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
		
		this.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/;
		
		this.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';
		
		var pad = {
			T: parseInt(Element.getStyle(element,'paddingTop'))||0,     R: parseInt(Element.getStyle(element,'paddingRight'))||0,
			B: parseInt(Element.getStyle(element,'paddingBottom'))||0,  L: parseInt(Element.getStyle(element,'paddingLeft'))||0
		};
		
		if ( /MSIE/.test(navigator.userAgent) )
			element.style.zoom = 1; // force 'hasLayout' in IE
		
		if (!keep)
			element.style.border = 'none';
		
		strip.style.borderColor = cc || this.gpc(element.parentNode);
		
		var cssHeight = Element.getHeight(element);

		for (var j in edges) {
		
			var bot = edges[j];

			strip.style.borderStyle = 'none '+ (opts[j+'R'] ? 'solid':'none') + ' none ' + (opts[j+'L'] ? 'solid':'none');
		
			var d = document.createElement('div');
			var ds = d.style;
		
			bot ? element.appendChild(d) : element.insertBefore(d, element.firstChild);
		
			if (bot && cssHeight != 'auto') {
		
				if (Element.getStyle(element, 'position') == 'static')
					element.style.position = 'relative';

				ds.position = 'absolute';
				ds.bottom = ds.left = ds.padding = ds.margin = '0';
	
				if (/MSIE/.test(navigator.userAgent) && !/8.0/.test(navigator.userAgent)) ds.setExpression('width', 'this.parentNode.offsetWidth');
				else ds.width = '100%';
	
			} else {

				ds.margin = !bot ? 
								'-' + pad.T + 'px -' + pad.R + 'px ' + (pad.T - this.width) + 'px -' + pad.L + 'px' : 
								(pad.B - this.width) + 'px -' + pad.R + 'px -' + pad.B + 'px -' + pad.L + 'px';
			}

			for (var i = 0; i < this.width; i++) {
				var w = Math.max(0, this.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);
			}
		}
	}
});