/*
* jQuery Expander plugin
* Version 0.5 (October 7, 2009)
* @requires jQuery v1.1.1+
* @author Karl Swedberg
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
*/


(function($) {

  $.fn.expander = function(options) {

    var opts = $.extend({}, $.fn.expander.defaults, options);
    var delayedCollapse;

    return this.each(function() {
      var thisEl = this, $this = $(this);
      var o = $.meta ? $.extend({}, opts, $this.data()) : opts;
      var cleanedTag, startTags, endTags;
      var allText = $this.html();
      var startText = allText.slice(0, o.slicePoint).replace(/\w+$/,'');
      startTags = startText.match(/<\w[^>]*>/g);
    if (startTags) {startText = allText.slice(0,o.slicePoint + startTags.join('').length).replace(/\w+$/,'');}

      if (startText.lastIndexOf('<') > startText.lastIndexOf('>') ) {
      startText = startText.slice(0,startText.lastIndexOf('<'));
      }

      var defined = {};
      $.each(['onSlice','beforeExpand', 'afterExpand', 'onCollapse'], function(index, val) {
      defined[val] = $.isFunction(o[val]);
      });

      var endText = allText.slice(startText.length);
      // create necessary expand/collapse elements if they don't already exist
    if (!$('span.details', this).length) {
        // end script if text length isn't long enough.
        if ( endText.replace(/\s+$/,'').split(' ').length < o.widow ) { return; }
        // otherwise, continue...
        if (defined.onSlice) { o.onSlice.call(thisEl); }
        if (endText.indexOf('</') > -1) {
          endTags = endText.match(/<(\/)?[^>]*>/g);
          for (var i=0; i < endTags.length; i++) {

            if (endTags[i].indexOf('</') > -1) {
              var startTag, startTagExists = false;
              for (var j=0; j < i; j++) {
                startTag = endTags[j].slice(0, endTags[j].indexOf(' ')).replace(/(\w)$/,'$1>');
                if (startTag == rSlash(endTags[i])) {
                  startTagExists = true;
                }
              }
              if (!startTagExists) {
                startText = startText + endTags[i];
                var matched = false;
                for (var s=startTags.length - 1; s >= 0; s--) {
                  if (startTags[s].slice(0, startTags[s].indexOf(' ')).replace(/(\w)$/,'$1>') == rSlash(endTags[i])
                  && matched == false) {
                    cleanedTag = cleanedTag ? startTags[s] + cleanedTag : startTags[s];
                    matched = true;
                  }
                };
              }
            }
          }

          endText = cleanedTag && cleanedTag + endText || endText;
        }
      $this.html([
      startText,
      '<span class="read-more">',
      o.expandPrefix,
        '<a href="#">',
        o.expandText,
        '</a>',
        '</span>',
      '<span class="details">',
      endText,
      '</span>'
      ].join('')
      );
      }

      var $thisDetails = $('span.details', this),
          $readMore = $('span.read-more', this);

    $thisDetails.hide();
  $readMore.find('a').click(function() {
  $readMore.hide();

  if (o.expandEffect === 'show' && !o.expandSpeed) {
          if (defined.beforeExpand) {o.beforeExpand.call(thisEl);}
  $thisDetails.show();
          if (defined.afterExpand) {o.afterExpand.call(thisEl);}
          delayCollapse(o, $thisDetails, thisEl);
  } else {
          if (defined.beforeExpand) {o.beforeExpand.call(thisEl);}
  $thisDetails[o.expandEffect](o.expandSpeed, function() {
            $thisDetails.css({zoom: ''});
            if (defined.beforeExpand) {o.afterExpand.call(thisEl);}
            delayCollapse(o, $thisDetails, thisEl);
  });
  }
        return false;
  });
      if (o.userCollapse) {
        $this
        .find('span.details').append('<span class="re-collapse">' + o.userCollapsePrefix + '<a href="#">' + o.userCollapseText + '</a></span>');
        $this.find('span.re-collapse a').click(function() {

          clearTimeout(delayedCollapse);
          var $detailsCollapsed = $(this).parents('span.details');
          reCollapse($detailsCollapsed);
          if (defined.onCollapse) {o.onCollapse.call(thisEl, true);}
          return false;
        });
      }
    });

    function reCollapse(el) {
       el.hide()
        .prev('span.read-more').show();
    }
    function delayCollapse(option, $collapseEl, thisEl) {
      if (option.collapseTimer) {
        delayedCollapse = setTimeout(function() {
          reCollapse($collapseEl);
          if ($.isFunction(option.onCollapse)) {option.onCollapse.call(thisEl, false);}
          }, option.collapseTimer
        );
      }
    }
    function rSlash(rString) {
      return rString.replace(/\//,'');
    }
  };
    // plugin defaults
  $.fn.expander.defaults = {
    slicePoint: 100, // the number of characters at which the contents will be sliced into two parts.
                            // Note: any tag names in the HTML that appear inside the sliced element before
                            // the slicePoint will be counted along with the text characters.
    widow: 4, // a threshold of sorts for whether to initially hide/collapse part of the element's contents.
                          // If after slicing the contents in two there are fewer words in the second part than
                          // the value set by widow, we won't bother hiding/collapsing anything.
    expandText: 'read more', // text displayed in a link instead of the hidden part of the element.
                                      // clicking this will expand/show the hidden/collapsed text
    expandPrefix: '&hellip; ',
    collapseTimer: 0, // number of milliseconds after text has been expanded at which to collapse the text again
    expandEffect: 'fadeIn',
    expandSpeed: '', // speed in milliseconds of the animation effect for expanding the text
    userCollapse: true, // allow the user to re-collapse the expanded text.
    userCollapseText: '[collapse expanded text]', // text to use for the link to re-collapse the text
    userCollapsePrefix: ' ',

    /* CALLBACK FUNCTIONS
** all functions have the this keyword mapped to the element that called .expander()
*/
    onSlice: null, // function() {}
    beforeExpand: null, // function() {},
    afterExpand: null, // function() {},
    onCollapse: null // function(byUser) {}
  };
})(jQuery);