/*!
 * jQuery corner plugin: simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 * version 2.01 (08-SEP-2009)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 */

/**
 *  corner() takes a single string argument:  $('#myDiv').corner("effect corners width")
 *
 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 
 *  corners: one or more of: top, bottom, tr, tl, br, or bl. 
 *           by default, all four corners are adorned. 
 *  width:   width of the effect; in the case of rounded corners this is the radius. 
 *           specify this value using the px suffix such as 10px (and yes, it must be pixels).
 *
 * @author Dave Methvin (http://methvin.com/jquery/jq-corner.html)
 * @author Mike Alsup   (http://jquery.malsup.com/corner/)
 */
;(function($) { 

    var moz = $.browser.mozilla && /gecko/i.test(navigator.userAgent);
    var webkit = $.browser.safari && $.browser.version >= 3;

    var expr = $.browser.msie && (function() {
        var div = document.createElement('div');
        try {
            div.style.setExpression('width','0+0');
        }
        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) {
        for ( ; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode ) {
            var v = $.css(node,'backgroundColor');
            if (v == 'rgba(0, 0, 0, 0)')
                continue; // webkit
            if (v.indexOf('rgb') >= 0) {
                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 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 '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;
        }
    };

    $.fn.corner = function(options) {
        // in 1.3+ we can fix mistakes with the ready state
        if (this.length == 0) {
            if (!$.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);
            var o = (options || $this.attr($.fn.corner.defaults.metaAttr) || '').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|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' && (moz || webkit) && !cc && !sc) {
                if (opts.TL)
                    $this.css(moz ? '-moz-border-radius-topleft' : '-webkit-border-top-left-radius', width + 'px');
                if (opts.TR)
                    $this.css(moz ? '-moz-border-radius-topright' : '-webkit-border-top-right-radius', width + 'px');
                if (opts.BL)
                    $this.css(moz ? '-moz-border-radius-bottomleft' : '-webkit-border-bottom-left-radius', width + 'px');
                if (opts.BR)
                    $this.css(moz ? '-moz-border-radius-bottomright' : '-webkit-border-bottom-right-radius', width + 'px');
                return;
            }
			
            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($.css(this,'paddingTop'))||0,
                R: parseInt($.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 = $.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 (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);
                    }
                }
            }
        });
    };

    $.fn.uncorner = function() {
        if (moz || webkit)
            this.css(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);