/*
 * Prototype/Scriptaculous corner plugin version 2.0 (24/04/2008)
 *
 * Based on the jQuery corner plugin version 1.7 (1/26/2007)
 *
 * Copyright (C) 2008  Laurent Dinclaux (laurent_at_gecka dot com)
 * 
 * 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

/**
 * 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 Laurent Dinclaux (laurent_at_gecka dot com)
 */
 
 
if (Object.isUndefined(Gaiak)) { var Gaiak = { } }
 
Gaiak.Corner = Class.create( {

    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) {
    	
    	this.ie = Prototype.Browser.IE;
    	this.ie6 = typeof document.body.style.maxHeight == "undefined";

    	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 = new Element('div');
        
        strip.setStyle( {overflow : 'hidden', 
        				 height : '1px', 
        				 backgroundColor : element.getStyle('background-color') || 'transparent',
        				 backgroundImage: element.getStyle('background-image') || 'None'} );
        				 
         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
        };
		
		/* manage border */
		if(keep) {
			
			strip.style.borderLeft = element.getStyle('border-left-width') + ' ' + element.getStyle('border-left-style') + ' ' + element.getStyle('border-left-color');
			strip.style.borderRight = element.getStyle('border-right-width') + ' ' + element.getStyle('border-right-style') + ' ' + element.getStyle('border-right-color');
			
			if( opts.TL || opts.TR ) element.setStyle( {'borderTop': 'none'});
			if( opts.BL || opts.BR ) element.setStyle( {'borderBottom': 'none'});
        }
		var bp = element.getStyle('backgroundPosition') ? element.getStyle('backgroundPosition').split(' ') : new Array(0,0);
       
       
        if (!keep) element.setStyle( {'border': 'none', 'backgroundPosition': bp[0] + ' ' +(-this.width)+'px'});
		
        
        if ( this.ie6 ) element.style.zoom = 1; // force 'hasLayout' in IE
        
        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 = new Element('div');
            var ds = d.style;
			
			ds.position = 'absolute'   

			if ( element.getStyle('position') == 'static' ) element.style.position = 'relative';
               
			bot ? element.appendChild(d) : element.insertBefore(d, element.firstChild);

            //if (bot && cssHeight != 'auto') {
            if (bot) {
            	
            	ds.bottom = ds.left = ds.padding = ds.margin = '0';
               
               	pb = ( (parseInt(element.getStyle('padding-bottom')) || 0) - this.width );
               	mb = ( (parseInt(element.getStyle('margin-bottom')) || 0) + this.width*2 );
               
                element.setStyle( { paddingBottom :  (pb > 0 ? pb : 0)  + 'px',  marginBottom : mb + 'px' } );
               
                ds.bottom = '-'+this.width+'px';
            }
            else {
            	
                ds.margin = !bot ? '0'+'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'; 
                           
                ds.top = '-'+this.width+'px';              
                
                pt = ( (parseInt(element.getStyle('padding-top')) || 0) - this.width );
                
				mt = ( (parseInt(element.getStyle('margin-top')) || 0) +  this.width);
            	//mt = ( (parseInt(element.getStyle('margin-top')) || 0) + (this.ie6 ? 0 : this.width) );
            	
            	element.setStyle( { paddingTop: (pt>0 ? pt : 0) +'px', marginTop : mt+'px'});
            	
            }
            
            if (this.ie6)
                    ds.setExpression('width', 'this.parentNode.offsetWidth');
                else
                    ds.width = '100%';   
            
            for (var i=0; i < this.width; i++) {
                
                var w = Math.max(0,this.getW(i));
                var e = strip.cloneNode(false);
                
                $(e).setStyle( {'margin': '0 '+(opts[j+'R']?w:0)+'px 0 '+(opts[j+'L']?w:0)+'px',
                				'backgroundPosition':  (opts[j+'L']?-w:0) + 'px ' + (bot ? -(element.getHeight()+i)-this.width : -this.width +i+1) +'px ' });
                
                bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
            }
        }
    }
});