/*!
 * jQuery corner plugin: simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 * version 2.09 (11-MAR-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:  $('#myDiv').corner("effect corners width")
 *
 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 
 *  corners: one or more of: top, bottom, tr, tl, br, or bl.  (default is all corners)
 *  width:   width of the effect; in the case of rounded corners this is the radius. 
 *           specify this value using the px suffix such as 10px (yes, it must be pixels).
 */
;
(function($) 
{ 
    //create new div, and get its style
    var style = document.createElement('div').style;
    
    //get browser type
    var moz = style['MozBorderRadius'] !== undefined;
    var webkit = style['WebkitBorderRadius'] !== undefined;
    var radius = style['borderRadius'] !== undefined || style['BorderRadius'] !== undefined;
    
    //find out the document mode (or set to 0 if not available)
    var mode = document.documentMode || 0;
    
    //if browser is ie, is it less than IE8.
    var noBottomFold = $.browser.msie && (($.browser.version < 8 && !mode) || mode < 8);

    //if browser is ie, can it handle expressions
    var 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;
    })();
    
    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');
            if (v && v != 'transparent' && v != 'rgba(0, 0, 0, 0)') 
            {
	            if (v.indexOf('rgb') >= 0) 
	            { 
	                var rgb = v.match(/\d+/g); 
	                return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
	            }
                return v;
		    }
		    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 = $(this);
		    // meta values override options
		    var o = [$this.attr($.fn.corner.defaults.metaAttr) || '', options || ''].join(' ').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|bevelfold|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dogfold|dog/;
		    var fx = ((o.match(re)||['round'])[0]);
		    var fold = /dogfold|bevelfold/.test(o);
		    var edges = { T:0, B:1 };
		    var 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)
		    };
		    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;
		    }
    			
		    var strip = document.createElement('div');
		    $(strip).css(
		    {
			    overflow: 'hidden',
			    height: '1px',
			    minHeight: '1px',
			    fontSize: '1px',
			    backgroundColor: sc || 'transparent',
			    borderStyle: 'solid'
		    });
    	
            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 (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);
            var cssHeight = $(this).outerHeight();

            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 (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) 
                        {
                            var 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 (var i=0; i < width; i++) 
                    {
                        var w = Math.max(0,getWidth(fx,i, width));
                        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);
                    }
    				
				    if (fold && $.support.boxModel) 
				    {
					    if (bot && noBottomFold) continue;
					    for (var c in opts) 
					    {
						    if (!opts[c]) continue;
						    if (bot && (c == 'TL' || c == 'TR')) continue;
						    if (!bot && (c == 'BL' || c == 'BR')) continue;
    						
						    var common = { position: 'absolute', border: 'none', margin: 0, padding: 0, overflow: 'hidden', backgroundColor: strip.style.borderColor };
						    var $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);