/*!
 * jQuery corner plugin: simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 * version 2.12 (23-MAY-2011)
 * 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:  $('#myDiv').corner("effect corners width")
 *
 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round).
 *  corners: one or more of: top, bottom, tr, tl, br, or bl.  (default is all corners)
 *  width:   width of the effect; in the case of rounded corners this is the radius.
 *           specify this value using the px suffix such as 10px (yes, it must be pixels).
 */
;(function($) {

    var style = document.createElement('div').style,
        moz = style['MozBorderRadius'] !== undefined,
        webkit = style['WebkitBorderRadius'] !== undefined,
        radius = style['borderRadius'] !== undefined || style['BorderRadius'] !== undefined,
        mode = document.documentMode || 0,
        noBottomFold = $.browser.msie && (($.browser.version < 8 && !mode) || mode < 8),

        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;
        })();

    $.support = $.support || {};
    $.support.borderRadius = moz || webkit || radius; // so you can do:  if (!$.support.borderRadius) $('#myDiv').corner();

    function sz(el, p) {
        return parseInt($.css(el,p))||0;
    };
    function hex2(s) {
        s = parseInt(s).toString(16);
        return ( s.length < 2 ) ? '0'+s : s;
    };
    function gpc(node) {
        while(node) {
            var v = $.css(node,'backgroundColor'), rgb;
            if (v && v != 'transparent' && v != 'rgba(0, 0, 0, 0)') {
                if (v.indexOf('rgb') >= 0) {
                    rgb = v.match(/\d+/g);
                    return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
                }
                return v;
            }
            if (node.nodeName.toLowerCase() == 'html')
                break;
            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 width-i;
            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;
            case 'steep':  return i/2 + 1;
            case 'invsteep':return (width-i)/2+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 = $(this),
                // meta values override options
                o = [$this.attr($.fn.corner.defaults.metaAttr) || '', options || ''].join(' ').toLowerCase(),
                keep = /keep/.test(o),                       // keep borders?
                cc = ((o.match(/cc:(#[0-9a-f]+)/)||[])[1]),  // corner color
                sc = ((o.match(/sc:(#[0-9a-f]+)/)||[])[1]),  // strip color
                width = parseInt((o.match(/(\d+)px/)||[])[1]) || 10, // corner width
                re = /round|bevelfold|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dogfold|dog|invsteep|steep/,
                fx = ((o.match(re)||['round'])[0]),
                fold = /dogfold|bevelfold/.test(o),
                edges = { T:0, B:1 },
                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)
                },
                // vars used in func later
                strip, pad, cssHeight, j, bot, d, ds, bw, i, w, e, c, common, $horz;

            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;
            }

            strip = document.createElement('div');
            $(strip).css({
                overflow: 'hidden',
                height: '1px',
                minHeight: '1px',
                fontSize: '1px',
                backgroundColor: sc || 'transparent',
                borderStyle: 'solid'
            });

            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);
            cssHeight = $(this).outerHeight();

            for (j in edges) {
                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');
                    d = document.createElement('div');
                    $(d).addClass('jquery-corner');
                    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) {
                            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 (i=0; i < width; i++) {
                        w = Math.max(0,getWidth(fx,i, width));
                        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 (c in opts) {
                            if (!opts[c]) continue;
                            if (bot && (c == 'TL' || c == 'TR')) continue;
                            if (!bot && (c == 'BL' || c == 'BR')) continue;

                            common = { position: 'absolute', border: 'none', margin: 0, padding: 0, overflow: 'hidden', backgroundColor: strip.style.borderColor };
                            $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);