/*!
 * jQuery Corners 0.3
 * Copyright (c) 2008 David Turnbull, Steven Wittens
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */

jQuery.fn.corners = function(options) {
  var doneClass = 'rounded_by_jQuery_corners'; /* To prevent double rounding */
  var settings = parseOptions(options);
  var webkitAvailable = false;
  try {
    webkitAvailable = (document.body.style.WebkitBorderRadius !== undefined);
    /* Google Chrome corners look awful */
    var versionIndex = navigator.userAgent.indexOf('Chrome');
    if (versionIndex >= 0) webkitAvailable = false;
  } catch(err) {}
  var mozillaAvailable = false;
  try {
    mozillaAvailable = (document.body.style.MozBorderRadius !== undefined);
    /* Firefox 2 corners look worse */
    var versionIndex = navigator.userAgent.indexOf('Firefox');
    if (versionIndex >= 0 && parseInt(navigator.userAgent.substring(versionIndex+8)) < 3) mozillaAvailable = false;
  } catch(err) {}
  return this.each(function(i,e){
    $e = jQuery(e);
    if ($e.hasClass(doneClass)) return;
    $e.addClass(doneClass);
    var classScan = /{(.*)}/.exec(e.className);
    var s = classScan ? parseOptions(classScan[1], settings) : settings;
    var nodeName = e.nodeName.toLowerCase();
    if (nodeName=='input') e = changeInput(e);
    if (webkitAvailable && s.webkit) roundWebkit(e, s);
    else if(mozillaAvailable && s.mozilla && (s.sizex == s.sizey)) roundMozilla(e, s);
    else {
      var bgColor = backgroundColor(e.parentNode);
      var fgColor = backgroundColor(e);
      switch (nodeName) {
        case 'a':
        case 'input':
          roundLink(e, s, bgColor, fgColor);
          break;
        default:
          roundDiv(e, s, bgColor, fgColor);
          break;
      }
    }
  });
  
  function roundWebkit(e, s) {
    var radius = '' + s.sizex + 'px ' + s.sizey + 'px';
    var $e = jQuery(e);
    if (s.tl) $e.css('WebkitBorderTopLeftRadius', radius);
    if (s.tr) $e.css('WebkitBorderTopRightRadius', radius);
    if (s.bl) $e.css('WebkitBorderBottomLeftRadius', radius);
    if (s.br) $e.css('WebkitBorderBottomRightRadius', radius);
  }
  
  function roundMozilla(e, s)
  {  
    var radius = '' + s.sizex + 'px';
    var $e = jQuery(e);
    if (s.tl) $e.css('-moz-border-radius-topleft', radius);
    if (s.tr) $e.css('-moz-border-radius-topright', radius);
    if (s.bl) $e.css('-moz-border-radius-bottomleft', radius);
    if (s.br) $e.css('-moz-border-radius-bottomright', radius);  
  }
  
  function roundLink(e, s, bgColor, fgColor) {
    var table = tableElement("table");
    var tbody = tableElement("tbody");
    table.appendChild(tbody);
    var tr1 = tableElement("tr");
    var td1 = tableElement("td", "top");
    tr1.appendChild(td1);
    var tr2 = tableElement("tr");
    var td2 = relocateContent(e, s, tableElement("td"));
    tr2.appendChild(td2);
    var tr3 = tableElement("tr");
    var td3 = tableElement("td", "bottom");
    tr3.appendChild(td3);
    if (s.tl||s.tr) {
      tbody.appendChild(tr1);
      addCorners(td1, s, bgColor, fgColor, true);
    }
    tbody.appendChild(tr2);
    if (s.bl||s.br) {
      tbody.appendChild(tr3);
      addCorners(td3, s, bgColor, fgColor, false);
    }
    e.appendChild(table);
    /* Clicking on $('a>table') in IE will trigger onclick but not the href  */
    if (jQuery.browser.msie) table.onclick = ieLinkBypass;
    /* Firefox 2 will render garbage unless we hide the overflow here */
    e.style.overflow = 'hidden';
  }
  
  function ieLinkBypass() {
    if (!this.parentNode.onclick) this.parentNode.click();
  }
  
  function changeInput(e) {
    var a1 = document.createElement("a");
    a1.id = e.id;
    a1.className = e.className;
    if (e.onclick) {
      a1.href = 'javascript:'
      a1.onclick = e.onclick;
    } else {
      jQuery(e).parent('form').each(function() {a1.href = this.action;});
      a1.onclick = submitForm;
    }
    var a2 = document.createTextNode(e.value);
    a1.appendChild(a2);
    e.parentNode.replaceChild(a1, e);
    return a1;
  }

  function submitForm() {
    jQuery(this).parent('form').each(function() {this.submit()});
    return false;
  }

  function roundDiv(e, s, bgColor, fgColor) {
    var div = relocateContent(e, s, document.createElement('div'));
    e.appendChild(div);
    if (s.tl||s.tr) addCorners(e, s, bgColor, fgColor, true);
    if (s.bl||s.br) addCorners(e, s, bgColor, fgColor, false);
  }
  
  function relocateContent(e, s, d) {
    var $e = jQuery(e);
    var c;
    while(c=e.firstChild) d.appendChild(c);
    if (e.style.height) {
      var h = parseInt($e.css('height'));
      d.style.height = h + 'px';
      h += parseInt($e.css('padding-top')) + parseInt($e.css('padding-bottom'));
      e.style.height = h + 'px';
    }
    if (e.style.width) {
      var w = parseInt($e.css('width'));
      d.style.width = w + 'px';
      w += parseInt($e.css('padding-left')) + parseInt($e.css('padding-right'));
      e.style.width = w + 'px';
    }
    d.style.paddingLeft = $e.css('padding-left');
    d.style.paddingRight = $e.css('padding-right');
    if (s.tl||s.tr) {
      d.style.paddingTop = adjustedPadding(e, s, $e.css('padding-top'), true);
    } else {
      d.style.paddingTop = $e.css('padding-top');
    }
    if (s.bl||s.br) {
      d.style.paddingBottom = adjustedPadding(e, s, $e.css('padding-bottom'), false);
    } else {
      d.style.paddingBottom = $e.css('padding-bottom');
    }
    e.style.padding = 0;
    return d;
  }
  
  function adjustedPadding(e, s, pad, top) {
    if (pad.indexOf("px") < 0) {
      try {
        //TODO Make this check work otherwise remove it
        console.error('%s padding not in pixels', (top ? 'top' : 'bottom'), e);
      }
      catch(err) {}
      pad = s.sizey + 'px';
    }
    pad = parseInt(pad);
    if (pad - s.sizey < 0) {
      try {
        console.error('%s padding is %ipx for %ipx corner:', (top ? 'top' : 'bottom'), pad, s.sizey, e);
      }
      catch(err) {}
      pad = s.sizey;
    }
    return pad - s.sizey + 'px';
  }

  function tableElement(kind, valign) {
    var e = document.createElement(kind)
    e.style.border = 'none';
    e.style.borderCollapse = 'collapse';
    e.style.borderSpacing = 0;
    e.style.padding = 0;
    e.style.margin = 0;
    if (valign) e.style.verticalAlign = valign;
    return e;
  }
  
  function backgroundColor(e) {
    try {
      var c = jQuery.css(e, "background-color");
      if ( c.match(/^(transparent|rgba\(0,\s*0,\s*0,\s*0\))$/i) && e.parentNode )
         return backgroundColor(e.parentNode);
      if (c==null)
        return "#ffffff";
      if (c.indexOf("rgb") > -1)
    	  c = rgb2hex(c);
      if (c.length == 4)
  	    c = hexShort2hex(c);
      return c;
    } catch(err) {
      return "#ffffff";
    }
  }
  
  function hexShort2hex(c) {
    return '#' +
    c.substring(1,2) +
    c.substring(1,2) +
    c.substring(2,3) +
    c.substring(2,3) +
    c.substring(3,4) +
    c.substring(3,4);
  }

  function rgb2hex(c) {
  	var x = 255;
  	var hex = '';
  	var i;
  	var regexp=/([0-9]+)[, ]+([0-9]+)[, ]+([0-9]+)/;
  	var array=regexp.exec(c);
  	for(i=1;i<4;i++) hex += ('0'+parseInt(array[i]).toString(16)).slice(-2);
  	return '#'+hex;
  }
  
  function parseOptions(options, settings) {
    var options = options || '';
    var s = {sizex:5, sizey:5, tl: false, tr: false, bl: false, br: false, webkit:true, mozilla: true, transparent:false};
    if (settings) {
      s.sizex = settings.sizex;
      s.sizey = settings.sizey;
      s.webkit = settings.webkit;
      s.transparent = settings.transparent;
      s.mozilla = settings.mozilla;
    }
    var sizex_set = false;
    var corner_set = false;
    jQuery.each(options.split(' '), function(idx, option) {
      option = option.toLowerCase();
      var i = parseInt(option);
      if (i > 0 && option == i + 'px') {
        s.sizey = i;
        if (!sizex_set) s.sizex = i;
        sizex_set = true;
      } else switch (option) {
        case 'no-native': s.webkit = s.mozilla = false; break;
        case 'webkit': s.webkit = true; break;
        case 'no-webkit': s.webkit = false; break;
        case 'mozilla': s.mozilla = true; break;
        case 'no-mozilla': s.mozilla = false; break;
        case 'anti-alias': s.transparent = false; break;
        case 'transparent': s.transparent = true; break;
        case 'top': corner_set = s.tl = s.tr = true; break;
        case 'right': corner_set = s.tr = s.br = true; break;
        case 'bottom': corner_set = s.bl = s.br = true; break;
        case 'left': corner_set = s.tl = s.bl = true; break;
        case 'top-left': corner_set = s.tl = true; break;
        case 'top-right': corner_set = s.tr = true; break;
        case 'bottom-left': corner_set = s.bl = true; break;
        case 'bottom-right': corner_set = s.br = true; break;
      }
    });
    if (!corner_set) {
      if (!settings) {
        s.tl = s.tr = s.bl = s.br = true;
      } else {
        s.tl = settings.tl;
        s.tr = settings.tr;
        s.bl = settings.bl;
        s.br = settings.br;
      }
    }
    return s;
  }
  
  function alphaBlend(a, b, alpha) {
    var ca = Array(
      parseInt('0x' + a.substring(1, 3)),
      parseInt('0x' + a.substring(3, 5)),
      parseInt('0x' + a.substring(5, 7))
    );
    var cb = Array(
      parseInt('0x' + b.substring(1, 3)),
      parseInt('0x' + b.substring(3, 5)),
      parseInt('0x' + b.substring(5, 7))
    );
    r = '0' + Math.round(ca[0] + (cb[0] - ca[0])*alpha).toString(16);
    g = '0' + Math.round(ca[1] + (cb[1] - ca[1])*alpha).toString(16);
    b = '0' + Math.round(ca[2] + (cb[2] - ca[2])*alpha).toString(16);
    return '#'
      + r.substring(r.length - 2)
      + g.substring(g.length - 2)
      + b.substring(b.length - 2);
  }

  function addCorners(e, s, bgColor, fgColor, top) {
    if (s.transparent) addTransparentCorners(e, s, bgColor, top);
    else addAntiAliasedCorners(e, s, bgColor, fgColor, top);
  }
  
  function addAntiAliasedCorners(e, s, bgColor, fgColor, top) {
    var i, j;
    var d = document.createElement("div");
    d.style.fontSize = '1px';
    d.style.backgroundColor = bgColor;
    var lastarc = 0;
    for (i = 1; i <= s.sizey; i++) {
      var coverage, arc2, arc3;
      // Find intersection of arc with bottom of pixel row
      arc = Math.sqrt(1.0 - Math.pow(1.0 - i / s.sizey, 2)) * s.sizex;
      // Calculate how many pixels are bg, fg and blended.
      var n_bg = s.sizex - Math.ceil(arc);
      var n_fg = Math.floor(lastarc);
      var n_aa = s.sizex - n_bg - n_fg;
      // Create pixel row wrapper
      var x = document.createElement("div");
      var y = d;
      x.style.margin = "0px " + n_bg + "px";
      x.style.height = '1px';
      x.style.overflow = 'hidden';
      // Create the pixel divs for a row (at least one)
      for (j = 1; j <= n_aa; j++) {
        // Calculate coverage per pixel (approximates arc within the pixel)
        if (j == 1) {
          if (j == n_aa) {
            // Single pixel
            coverage = ((arc + lastarc) * .5) - n_fg;
          }
          else {
            // First in a run
            arc2 = Math.sqrt(1.0 - Math.pow(1.0 - (n_bg + 1) / s.sizex, 2)) * s.sizey;
            coverage = (arc2 - (s.sizey - i)) * (arc - n_fg - n_aa + 1) * .5;
          }
        }
        else if (j == n_aa) {
          // Last in a run
          arc2 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j + 1) / s.sizex, 2)) * s.sizey;
          coverage = 1.0 - (1.0 - (arc2 - (s.sizey - i))) * (1.0 - (lastarc - n_fg)) * .5;
        }
        else {
          // Middle of a run
          arc3 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j) / s.sizex, 2)) * s.sizey;
          arc2 = Math.sqrt(1.0 - Math.pow((s.sizex - n_bg - j + 1) / s.sizex, 2)) * s.sizey;
          coverage = ((arc2 + arc3) * .5) - (s.sizey - i);
        }
        
        addCornerDiv(s, x, y, top, alphaBlend(bgColor, fgColor, coverage));
        y = x;
        var x = y.cloneNode(false);
        x.style.margin = "0px 1px";
      }
      addCornerDiv(s, x, y, top, fgColor);
      lastarc = arc;
    }
    if (top)
      e.insertBefore(d, e.firstChild);
    else
      e.appendChild(d);
  }
  
  function addCornerDiv(s, x, y, top, color) {
    if (top && !s.tl) x.style.marginLeft = 0;
    if (top && !s.tr) x.style.marginRight = 0;
    if (!top && !s.bl) x.style.marginLeft = 0;
    if (!top && !s.br) x.style.marginRight = 0;
    x.style.backgroundColor = color;
    if (top)
      y.appendChild(x);
    else
      y.insertBefore(x, y.firstChild);
  }
       /*
Fixed.
Now actually sets transparent corners and uses the bgColor as the filled colour.
Unfortunately the fixes get called twice if top AND bottom corners are used.
No way around this unless re-writing more of the script.
  */
  function addTransparentCorners(e, s, bgColor, top) {
//Use jquery instead of dom methods for managing elements
var fillColor = $(e).css('background-color');
//set bgcolor to transparent
$(e).css({backgroundColor: 'transparent'});

//set all child backgroundColors unless otherwise set
$(e).children().each(function(i){
var bg = $(this).css('background-color');
if (bg != 'rgb(0, 0, 0, 0)' && bg != 'transparent');
$(this).css({backgroundColor: fillColor});
});

    var d = $('<div />').css({fontSize: '1px'});
    var strip = $('<div />')
.css({
overflow: 'hidden',
height: '1px',
backgroundColor: fillColor,
border: 'none'
});
    var sizex = s.sizex;
    var sizey = s.sizey;
    if (!sizey) sizey = 1; /* hint for 1x1 */
    for (var i=0; i < s.sizey; i++) {
      var w = sizex - Math.floor(Math.sqrt(1.0 - Math.pow(1.0 - i / sizey, 2)) * sizex);
      if (i==2 && s.sizex==6 && s.sizey==6) w = 2; /* hint for 6x6 */
      var x = strip.clone().css({
margin: '0 '+ w +'px'
      });
      if (top) x.css({margin: '0 '+(s.tr?w:0)+'px 0 '+(s.tl?w:0)+'px'});
      else x.css({margin: '0 '+(s.br?w:0)+'px 0 '+(s.bl?w:0)+'px'});
      top ? d.append(x) : d.prepend(x);
    }
    if (top)
      $(e).prepend(d);
    else
      $(e).append(d);
  }


}