/*

 * jQuery Beauty Tips plugin

 * Version 0.7  (10/20/2008)

 * @requires jQuery v1.2+ (not fully tested on versions prior to 1.2.6)

 *

 * Dual licensed under the MIT and GPL licenses:

 * http://www.opensource.org/licenses/mit-license.php

 * http://www.gnu.org/licenses/gpl.html

 *

 * No guarantees, warranties, or promises of any kind

 *

 */

/**

 * @name Beauty Tips

 * @type jQuery

 * @cat Plugins/bt

 * @return jQuery

 * @author Jeff Robbins - Lullabot - http://www.lullabot.com

 *

 * @credit Inspired by Karl Swedberg's ClueTip

 *    (http://plugins.learningjquery.com/cluetip/), which in turn was inspired

 *    by Cody Lindley's jTip (http://www.codylindley.com)

 *

 * @fileoverview

 * Beauty Tips is a jQuery tooltips plugin which uses the canvas drawing element

 * in the HTML5 spec in order to dynamically draw tooltip "talk bubbles" around

 * the descriptive help text associated with an item. This is in many ways

 * similar to Google Maps which both provides similar talk-bubbles and uses the

 * canvas element to draw them.

 *

 * The canvas element is supported in modern versions of FireFox, Safari, and

 * Opera. However, Internet Explorer needs a separate library called ExplorerCanvas

 * included on the page in order to support canvas drawing functions. ExplorerCanvas

 * was created by Google for use with their web apps and you can find it here:

 * http://excanvas.sourceforge.net/

 *

 * Beauty Tips was written to be simple to use and pretty. All of its options

 * are documented at the bottom of this file and defaults can be overwritten

 * globally for the entire page, or individually on each call.

 *

 * By default each tooltip will be positioned on the side of the target element

 * which has the most free space. This is affected by the scroll position and

 * size of the current window, so each Beauty Tip is redrawn each time it is

 * displayed. It may appear above an element at the bottom of the page, but when

 * the page is scrolled down (and the element is at the top of the page) it will

 * then appear below it. Additionally, positions can be forced or a preferred

 * order can be defined. See examples below.

 *

 * Usage

 * The function can be called in a number of ways.

 * $(selector).bt();

 * $(selector).bt('Content text');

 * $(selector).bt('Content text', {option1: value, option2: value});

 * $(selector).bt({option1: value, option2: value});

 *

 * Some examples:

 *

 * @example

 * $('[title]').bt();

 * This is probably the simplest example. It will go through the page finding

 * every element which has a title attribute and give it a Beauty Tips popup

 * which gets fired on hover.

 *

 * @example

 * $('h2').bt('I am an H2 element!', {trigger: 'click', positions: 'top'});

 * When any H2 element on the page is clicked on, a tip will appear above it.

 *

 * @example

 * $('a[href]').bt({

 *  titleSelector: "attr('href')",

 *  fill: 'red',

 *  cssStyles: {color: 'white', fontWeight: 'bold', width: 'auto'},

 *  width: 400,

 *  padding: 10,

 *  cornerRadius: 10,

 *  animate: true,

 *  spikeLength: 15,

 *  spikeGirth: 5,

 *  positions: ['left', 'right', 'bottom'],

 *  });

 * This will find all <a> tags and display a red baloon with bold white text

 * containing the href link. The box will be a variable width up to 400px with

 * rounded corners and will fade in and animate position toward the target

 * object when appearing. The script will try to position the box to the left,

 * then to the right, and finally it will place it on the bottom if it does not

 * fit elsewhere.

 *

 * @example

 * $('#my-table td[title]').bt({

 *  preShow: function() {

 *    $(this).data('origBG', $(this).css('background-color'));

 *    $(this).css('background-color', 'yellow');

 *  },

 *  postHide: function() {

 *    $(this).css('background-color', $(this).data('origBG'));

 *  }

 * });

 * Find every table cell within #mytable with a title attribute. Hilight the cell

 * yellow before displaying the BeautyTip. Restore it to its original background

 * when hiding/removing the BeautyTip.

 *

 * @example

 * $().bt.defaults.fill = 'rgba(102, 102, 255. .8)';

 * $(selector).bt();

 * All bubbles will be filled with a semi-transparent light-blue background

 * unless otherwise specified.

 *

 */

jQuery.fn.bt = function(content, options) {

  if (typeof content != 'string') {

    var contentSelect = true;

    options = content;

    content = false;

  }

  else {

    var contentSelect = false;

  }

  return this.each(function(index) {

    var opts = jQuery.extend(false, jQuery.fn.bt.defaults, options);

    // clean up the options

    opts.spikeLength = numb(opts.spikeLength);

    opts.spikeGirth = numb(opts.spikeGirth);

    opts.overlap = numb(opts.overlap);

    var turnOn = function () {

      if (typeof $(this).data('bt-box') == 'object') {

        // if there's already a popup, remove it before creating a new one.

        turnOff.apply(this);

      }

      // trigger preShow function

      opts.preShow.apply(this);

      if (contentSelect) {

        // bizarre, I know

        if (opts.killTitle) {

          // if we've killed the title attribute, it's been stored in 'bt-xTitle' so get it..

          $(this).attr('title', $(this).attr('bt-xTitle'));

        }

        // then evaluate the selector... title is now in place

        content = eval('$(this).' + opts.titleSelector);

        if (opts.killTitle) {

          // now remove the title again, so we don't get double tips

          $(this).removeAttr('title');

        }

      }

      var offsetParent = $(this).offsetParent();

      var pos = $(this).btPosition();

      var top = numb(pos.top) + numb($(this).css('margin-top')); // IE can return 'auto' for margins

      var left = numb(pos.left) + numb($(this).css('margin-left'));

      var width = $(this).outerWidth();

      var height = $(this).outerHeight();

      // get the dimensions of the text box

      var $text = $('<div class="bt-content"></div>').append(content).css({padding: opts.padding + 'px', position: 'absolute', width: opts.width + 'px', zIndex: opts.textzIndex}).css(opts.cssStyles);

      var $box = $('<div class="bt-wrapper"></div>').append($text).addClass(opts.cssClass).css({position: 'absolute', width: opts.width + 'px'}).appendTo(offsetParent);

      $(this).data('bt-box', $box);

      // see if the text box will fit in the various positions

      var scrollTop = numb($(document).scrollTop());

      var scrollLeft = numb($(document).scrollLeft());

      var docWidth = numb($(window).width());

      var docHeight = numb($(window).height());

      var winRight = scrollLeft + docWidth;

      var winBottom = scrollTop + docHeight;

      var space = new Object();

      space.top = $(this).offset().top - scrollTop;

      space.bottom = docHeight - (($(this).offset().top + height) - scrollTop);

      space.left = $(this).offset().left - scrollLeft;

      space.right = docWidth - (($(this).offset().left + width) - scrollLeft);

      var textOutHeight = numb($text.outerHeight());

      var textOutWidth = numb($text.outerWidth());

      if (opts.positions.constructor == String) {

        opts.positions = opts.positions.replace(/ /, '').split(',');

      }

      if (opts.positions[0] == 'most') {

        // figure out which is the largest

        var position = 'top'; // prime the pump

        for (var pig in space) { // pigs in space!

          position = space[pig] > space[position] ? pig : position;

        }

      }

      else {

        for (var x in opts.positions) {

          var position = opts.positions[x];

          if ((position == 'left' || position == 'right') && space[position] > textOutWidth + opts.spikeLength) {

            break;

          }

          else if ((position == 'top' || position == 'bottom') && space[position] > textOutHeight + opts.spikeLength) {

            break;

          }

        }

      }

      var horiz = left + ((width - textOutWidth)/2);

      var vert = top + ((height - textOutHeight)/2);

      var animDist = opts.animate ? numb(opts.distance) : 0;

      var points = new Array();

      var textTop, textLeft, textRight, textBottom, textTopSpace, textBottomSpace, textLeftSpace, textRightSpace, crossPoint, textCenter;

      // Yes, yes, this next bit really could use to be condensed

      // each switch case is basically doing the same thing in slightly different ways

      switch(position) {

        case 'top':

          // spike on bottom

          $text.css('margin-bottom', opts.spikeLength + 'px');

          $box.css({top: (top - $text.outerHeight(true) - animDist) + opts.overlap, left: horiz});

          // move text left/right if extends out of window

          textRightSpace = (winRight - opts.windowMargin) - ($text.offset().left + $text.outerWidth(true));

          var xShift = 0;

          if (textRightSpace < 0) {

            // shift it left

            $box.css('left', (numb($box.css('left')) + textRightSpace) + 'px');

            xShift -= textRightSpace;

          }

          // we test left space second to ensure that left of box is visible

          textLeftSpace = ($text.offset().left + numb($text.css('margin-left'))) - (scrollLeft + opts.windowMargin);

          if (textLeftSpace < 0) {

            // shift it right

            $box.css('left', (numb($box.css('left')) - textLeftSpace) + 'px');

            xShift += textLeftSpace;

          }

          textTop = $text.btPosition().top + numb($text.css('margin-top'));

          textLeft = $text.btPosition().left + numb($text.css('margin-left'));

          textRight = textLeft + $text.outerWidth();

          textBottom = textTop + $text.outerHeight();

          textCenter = {x: textLeft + ($text.outerWidth()/2), y: textTop + ($text.outerHeight()/2)};

          // points[points.length] = {x: x, y: y};

          points[points.length] = spikePoint = {y: textBottom + opts.spikeLength, x: ((textRight-textLeft)/2) + xShift, type: 'spike'};

          crossPoint = findIntersectX(spikePoint.x, spikePoint.y, textCenter.x, textCenter.y, textBottom);

          // make sure that the crossPoint is not outside of text box boundaries

          crossPoint.x = crossPoint.x < textLeft + opts.spikeGirth/2 + opts.cornerRadius ? textLeft + opts.spikeGirth/2 + opts.cornerRadius : crossPoint.x;

          crossPoint.x =  crossPoint.x > (textRight - opts.spikeGirth/2) - opts.cornerRadius ? (textRight - opts.spikeGirth/2) - opts.CornerRadius : crossPoint.x;

          points[points.length] = {x: crossPoint.x - (opts.spikeGirth/2), y: textBottom, type: 'join'};

          points[points.length] = {x: textLeft, y: textBottom, type: 'corner'};  // left bottom corner

          points[points.length] = {x: textLeft, y: textTop, type: 'corner'};     // left top corner

          points[points.length] = {x: textRight, y: textTop, type: 'corner'};    // right top corner

          points[points.length] = {x: textRight, y: textBottom, type: 'corner'}; // right bottom corner

          points[points.length] = {x: crossPoint.x + (opts.spikeGirth/2), y: textBottom, type: 'join'};

          points[points.length] = spikePoint;

          break;

        case 'left':

          // spike on right

          $text.css('margin-right', opts.spikeLength + 'px');

          $box.css({top: vert + 'px', left: ((left - $text.outerWidth(true) - animDist) + opts.overlap) + 'px'});

          // move text up/down if extends out of window

          textBottomSpace = (winBottom - opts.windowMargin) - ($text.offset().top + $text.outerHeight(true));

          var yShift = 0;

          if (textBottomSpace < 0) {

            // shift it up

            $box.css('top', (numb($box.css('top')) + textBottomSpace) + 'px');

            yShift -= textBottomSpace;

          }

          // we ensure top space second to ensure that top of box is visible

          textTopSpace = ($text.offset().top + numb($text.css('margin-top'))) - (scrollTop + opts.windowMargin);

          if (textTopSpace < 0) {

            // shift it down

            $box.css('top', (numb($box.css('top')) - textTopSpace) + 'px');

            yShift += textTopSpace;

          }

          textTop = $text.btPosition().top + numb($text.css('margin-top'));

          textLeft = $text.btPosition().left + numb($text.css('margin-left'));

          textRight = textLeft + $text.outerWidth();

          textBottom = textTop + $text.outerHeight();

          textCenter = {x: textLeft + ($text.outerWidth()/2), y: textTop + ($text.outerHeight()/2)};

          points[points.length] = spikePoint = {x: textRight + opts.spikeLength, y: ((textBottom-textTop)/2) + yShift, type: 'spike'};

          crossPoint = findIntersectY(spikePoint.x, spikePoint.y, textCenter.x, textCenter.y, textRight);

          // make sure that the crossPoint is not outside of text box boundaries

          crossPoint.y = crossPoint.y < textTop + opts.spikeGirth/2 + opts.cornerRadius ? textTop + opts.spikeGirth/2 + opts.cornerRadius : crossPoint.y;

          crossPoint.y =  crossPoint.y > (textBottom - opts.spikeGirth/2) - opts.cornerRadius ? (textBottom - opts.spikeGirth/2) - opts.cornerRadius : crossPoint.y;

          points[points.length] = {x: textRight, y: crossPoint.y + opts.spikeGirth/2, type: 'join'};

          points[points.length] = {x: textRight, y: textBottom, type: 'corner'}; // right bottom corner

          points[points.length] = {x: textLeft, y: textBottom, type: 'corner'};  // left bottom corner

          points[points.length] = {x: textLeft, y: textTop, type: 'corner'};     // left top corner

          points[points.length] = {x: textRight, y: textTop, type: 'corner'};    // right top corner

          points[points.length] = {x: textRight, y: crossPoint.y - opts.spikeGirth/2, type: 'join'};

          points[points.length] = spikePoint;

          break;

        case 'bottom':

          // spike on top

          $text.css('margin-top', opts.spikeLength + 'px');

          $box.css({top: (top + height + animDist) - opts.overlap, left: horiz});

          // move text up/down if extends out of window

          textRightSpace = (winRight - opts.windowMargin) - ($text.offset().left + $text.outerWidth(true));

          var xShift = 0;

          if (textRightSpace < 0) {

            // shift it left

            $box.css('left', (numb($box.css('left')) + textRightSpace) + 'px');

            xShift -= textRightSpace;

          }

          // we ensure left space second to ensure that left of box is visible

          textLeftSpace = ($text.offset().left + numb($text.css('margin-left')))  - (scrollLeft + opts.windowMargin);

          if (textLeftSpace < 0) {

            // shift it right

            $box.css('left', (numb($box.css('left')) - textLeftSpace) + 'px');

            xShift += textLeftSpace;

          }

          textTop = $text.btPosition().top + numb($text.css('margin-top'));

          textLeft = $text.btPosition().left + numb($text.css('margin-left'));

          textRight = textLeft + $text.outerWidth();

          textBottom = textTop + $text.outerHeight();

          textCenter = {x: textLeft + ($text.outerWidth()/2), y: textTop + ($text.outerHeight()/2)};

          points[points.length] = spikePoint = {x: ((textRight-textLeft)/2) + xShift, y: 0, type: 'spike'};

          crossPoint = findIntersectX(spikePoint.x, spikePoint.y, textCenter.x, textCenter.y, textTop);

          // make sure that the crossPoint is not outside of text box boundaries

          crossPoint.x = crossPoint.x < textLeft + opts.spikeGirth/2 + opts.cornerRadius ? textLeft + opts.spikeGirth/2 + opts.cornerRadius : crossPoint.x;

          crossPoint.x =  crossPoint.x > (textRight - opts.spikeGirth/2) - opts.cornerRadius ? (textRight - opts.spikeGirth/2) - opts.cornerRadius : crossPoint.x;

          points[points.length] = {x: crossPoint.x + opts.spikeGirth/2, y: textTop, type: 'join'};

          points[points.length] = {x: textRight, y: textTop, type: 'corner'};    // right top corner

          points[points.length] = {x: textRight, y: textBottom, type: 'corner'}; // right bottom corner

          points[points.length] = {x: textLeft, y: textBottom, type: 'corner'};  // left bottom corner

          points[points.length] = {x: textLeft, y: textTop, type: 'corner'};     // left top corner

          points[points.length] = {x: crossPoint.x - (opts.spikeGirth/2), y: textTop, type: 'join'};

          points[points.length] = spikePoint;

          break;

        case 'right':

          // spike on left

          $text.css('margin-left', (opts.spikeLength + 'px'));

          $box.css({top: vert + 'px', left: ((left + width + animDist) - opts.overlap) + 'px'});

          // move text up/down if extends out of window

          textBottomSpace = (winBottom - opts.windowMargin) - ($text.offset().top + $text.outerHeight(true));

          var yShift = 0;

          if (textBottomSpace < 0) {

            // shift it up

            $box.css('top', (numb($box.css('top')) + textBottomSpace) + 'px');

            yShift -= textBottomSpace;

          }

          // we ensure top space second to ensure that top of box is visible

          textTopSpace = ($text.offset().top + numb($text.css('margin-top'))) - (scrollTop + opts.windowMargin);

          if (textTopSpace < 0) {

            // shift it down

            $box.css('top', (numb($box.css('top')) - textTopSpace) + 'px');

            yShift += textTopSpace;

          }

          textTop = $text.btPosition().top + numb($text.css('margin-top'));

          textLeft = $text.btPosition().left + numb($text.css('margin-left'));

          textRight = textLeft + $text.outerWidth();

          textBottom = textTop + $text.outerHeight();

          textCenter = {x: textLeft + ($text.outerWidth()/2), y: textTop + ($text.outerHeight()/2)};

          points[points.length] = spikePoint = {x: 0, y: ((textBottom-textTop)/2) + yShift, type: 'spike'};

          crossPoint = findIntersectY(spikePoint.x, spikePoint.y, textCenter.x, textCenter.y, textLeft);

          // make sure that the crossPoint is not outside of text box boundaries

          crossPoint.y = crossPoint.y < textTop + opts.spikeGirth/2 + opts.cornerRadius ? textTop + opts.spikeGirth/2 + opts.cornerRadius : crossPoint.y;

          crossPoint.y =  crossPoint.y > (textBottom - opts.spikeGirth/2) - opts.cornerRadius ? (textBottom - opts.spikeGirth/2) - opts.cornerRadius : crossPoint.y;

          points[points.length] = {x: textLeft, y: crossPoint.y - opts.spikeGirth/2, type: 'join'};

          points[points.length] = {x: textLeft, y: textTop, type: 'corner'};     // left top corner

          points[points.length] = {x: textRight, y: textTop, type: 'corner'};    // right top corner

          points[points.length] = {x: textRight, y: textBottom, type: 'corner'}; // right bottom corner

          points[points.length] = {x: textLeft, y: textBottom, type: 'corner'};  // left bottom corner

          points[points.length] = {x: textLeft, y: crossPoint.y + opts.spikeGirth/2, type: 'join'};

          points[points.length] = spikePoint;

          break;

      } // </ switch >

      var canvas = $('<canvas width="'+ (numb($text.outerWidth(true)) + opts.strokeWidth*2) +'" height="'+ (numb($text.outerHeight(true)) + opts.strokeWidth*2) +'"></canvas>').appendTo($box).css({position: 'absolute', top: $text.btPosition().top, left: $text.btPosition().left, zIndex: opts.boxzIndex}).get(0);

      // if excanvas is set up, we need to initialize the new canvas element

      if (typeof G_vmlCanvasManager != 'undefined') {

        canvas = G_vmlCanvasManager.initElement(canvas);

      }

      if (opts.cornerRadius > 0) {

        // round the corners!

        var newPoints = new Array();

        var newPoint;

        for (var i=0; i<points.length; i++) {

          if (points[i].type == 'corner') {

            // create two new arc points

            // find point between this and previous (using modulo in case of ending)

            newPoint = betweenPoint(points[i], points[(i-1)%points.length], opts.cornerRadius);

            newPoint.type = 'arcStart';

            newPoints[newPoints.length] = newPoint;

            // the original corner point

            newPoints[newPoints.length] = points[i];

            // find point between this and next

            newPoint = betweenPoint(points[i], points[(i+1)%points.length], opts.cornerRadius);

            newPoint.type = 'arcEnd';

            newPoints[newPoints.length] = newPoint;

          }

          else {

            newPoints[newPoints.length] = points[i];

          }

        }

        // overwrite points with new version

        points = newPoints;

      }

      var ctx = canvas.getContext("2d");

      drawIt.apply(ctx, [points]);

      ctx.fillStyle = opts.fill;

      if (opts.shadow) {

        ctx.shadowOffsetX = 2;

        ctx.shadowOffsetY = 2;

        ctx.shadowBlur = 5;

        ctx.shadowColor =  opts.shadowColor;

      }

      ctx.closePath();

      ctx.fill();

      if (opts.strokeWidth > 0) {

        ctx.lineWidth = opts.strokeWidth;

        ctx.strokeStyle = opts.strokeStyle;

        ctx.beginPath();

        drawIt.apply(ctx, [points]);

        ctx.closePath();

        ctx.stroke();

      }

      if (opts.animate) {

        $box.css({opacity: 0.1});

      }

      $box.css({visibility: 'visible'});

      if (opts.overlay) {

        var overlay = $('<div class="bt-overlay"></div>').css({

            position: 'absolute',

            backgroundColor: 'blue',

            top: top,

            left: left,

            width: width,

            height: height,

            opacity: '.2'

          }).appendTo(offsetParent);

        $(this).data('overlay', overlay);

      }

      var animParams = {opacity: 1};

      if (opts.animate) {

        switch (position) {

          case 'top':

            animParams.top = $box.btPosition().top + opts.distance;

            break;

          case 'left':

            animParams.left = $box.btPosition().left + opts.distance;

            break;

          case 'bottom':

            animParams.top = $box.btPosition().top - opts.distance;

            break;

          case 'right':

            animParams.left = $box.btPosition().left - opts.distance;

            break;

        }

        $box.animate(animParams, {duration: opts.speed, easing: opts.easing});

      }

      // trigger postShow function

      opts.postShow.apply(this);

    } // </ turnOn() >

    var turnOff = function() {

      // trigger preHide function

      opts.preHide.apply(this);

      var box = $(this).data('bt-box');

      var overlay = $(this).data('bt-overlay');

      if (typeof box == 'object') {

        $(box).remove();

        $(this).removeData('bt-box');

      }

      if (typeof overlay == 'object') {

        $(overlay).remove();

        $(this).removeData('bt-overlay');

      }

      // trigger postHide function

      opts.postHide.apply(this);

    } // </ turnOff() >

    var refresh = function() {

      turnOff.apply(this);

      turnOn.apply(this);

    }

    /**

     * This is sort of the "starting spot" for the this.each()

     * These are sort of the init functions to handle the call

     */

    if (opts.killTitle) {

      $(this).find('[title]').andSelf().each(function() {

        $(this).attr('bt-xTitle', $(this).attr('title')).removeAttr('title');

      });

    }

    if (typeof opts.trigger == 'string') {

      opts.trigger = [opts.trigger];

    }

    if (opts.trigger[0] == 'hover') {

      $(this).hover(

        function() {

          turnOn.apply(this);

        },

        function() {

          turnOff.apply(this);

        }

      );

    }

    else if (opts.trigger[0] == 'now') {

      var box = $(this).data('bt-box');

      if (typeof box == 'object') {

        turnOff.apply(this);

      }

      else {

        turnOn.apply(this);

      }

    }

    else if (opts.trigger.length > 1 && opts.trigger[0] != opts.trigger[1]) {

      $(this)

        .bind(opts.trigger[0], function() {

          turnOn.apply(this);

        })

        .bind(opts.trigger[1], function() {

          turnOff.apply(this);

        });

    }

    else {