/**
* jCarousel - Riding carousels with jQuery
*   http://sorgalla.com/jcarousel/
*
* Copyright (c) 2006 Jan Sorgalla (http://sorgalla.com)
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* Built on top of the jQuery library
*   http://jquery.com
*
* Inspired by the "Carousel Component" by Bill Scott
*   http://billwscott.com/carousel/
*/


/**
* Creates a carousel for all matched elements.
*
* @example $("#mycarousel").jcarousel();
* @before <ul id="mycarousel" class="jcarousel-skin-name"><li>First item</li><li>Second item</li></ul>
* @result
*
* <div class="jcarousel-skin-name">
*   <div class="jcarousel-container">
*     <div disabled="disabled" class="jcarousel-prev jcarousel-prev-disabled"></div>
*     <div class="jcarousel-next"></div>
*     <div class="jcarousel-clip">
*       <ul class="jcarousel-list">
*         <li class="jcarousel-item-1">First item</li>
*         <li class="jcarousel-item-2">Second item</li>
*       </ul>
*     </div>
*   </div>
* </div>
*
* @name jcarousel
* @type jQuery
* @param Hash o A set of key/value pairs to set as configuration properties.
* @cat Plugins/jCarousel
*/
$.fn.jcarousel = function(o) {
  return this.each(function() {
      new $jc(this, o);
  });;
};

// Default configuration properties.
var defaults = {
  vertical: false,
  start: 1,
  offset: 1,
  size: null,
  scroll: 3,
  visible: null,
  animation: 'normal',
  easing: 'swing',
  auto: 0,
  wrap: null,
  initCallback: null,
  reloadCallback: null,
  itemLoadCallback: null,
  itemFirstInCallback: null,
  itemFirstOutCallback: null,
  itemLastInCallback: null,
  itemLastOutCallback: null,
  itemVisibleInCallback: null,
  itemVisibleOutCallback: null,
  buttonNextHTML: '<div></div>',
  buttonPrevHTML: '<div></div>',
  buttonNextEvent: 'click',
  buttonPrevEvent: 'click',
  buttonNextCallback: null,
  buttonPrevCallback: null
};



/**
* The jCarousel object.
*
* @constructor
* @name $.jcarousel
* @param Object e The element to create the carousel for.
* @param Hash o A set of key/value pairs to set as configuration properties.
* @cat Plugins/jCarousel
*/
$.jcarousel = function(e, o) {
  
  this.options    = $.extend({}, defaults, o || {});

  this.locked     = false;

  this.container  = null;
  this.clip       = null;
  this.list       = null;
  this.buttonNext = null;
  this.buttonPrev = null;

  this.wh = !this.options.vertical ? 'width' : 'height';
  this.lt = !this.options.vertical ? 'left' : 'top';

  // Extract skin class
  var skin = '', split = e.className.split(' ');

  for (var i = 0; i < split.length; i++) {
      if (split[i].indexOf('jcarousel-skin') != -1) {
          $(e).removeClass(split[i]);
          var skin = split[i];
          break;
      }
  }

  if (e.nodeName == 'UL' || e.nodeName == 'OL') {
      this.list = $(e);
      this.container = this.list.parent();

      if (this.container.hasClass('jcarousel-clip')) {
          if (!this.container.parent().hasClass('jcarousel-container'))
              this.container = this.container.wrap('<div></div>');

          this.container = this.container.parent();
      } else if (!this.container.hasClass('jcarousel-container'))
          this.container = this.list.wrap('<div></div>').parent();
  } else {
      this.container = $(e);
      this.list = $(e).find('>ul,>ol,div>ul,div>ol');
  }

  if (skin != '' && this.container.parent()[0].className.indexOf('jcarousel-skin') == -1)
  	this.container.wrap('<div class=" '+ skin + '"></div>');

  this.clip = this.list.parent();

  if (!this.clip.length || !this.clip.hasClass('jcarousel-clip'))
      this.clip = this.list.wrap('<div></div>').parent();

  this.buttonPrev = $('.jcarousel-prev', this.container);

  if (this.buttonPrev.size() == 0 && this.options.buttonPrevHTML != null)
      this.buttonPrev = this.clip.before(this.options.buttonPrevHTML).prev();

  this.buttonPrev.addClass(this.className('jcarousel-prev'));

  this.buttonNext = $('.jcarousel-next', this.container);

  if (this.buttonNext.size() == 0 && this.options.buttonNextHTML != null)
      this.buttonNext = this.clip.before(this.options.buttonNextHTML).prev();

  this.buttonNext.addClass(this.className('jcarousel-next'));

  this.clip.addClass(this.className('jcarousel-clip'));
  this.list.addClass(this.className('jcarousel-list'));
  this.container.addClass(this.className('jcarousel-container'));

  var di = this.options.visible != null ? Math.ceil(this.clipping() / this.options.visible) : null;
  var li = this.list.children('li');

  var self = this;

  if (li.size() > 0) {
      var wh = 0, i = this.options.offset;
      li.each(function() {
          self.format(this, i++);
          wh += self.dimension(this, di);
      });

      this.list.css(this.wh, wh + 'px');

      // Only set if not explicitly passed as option
      if (!o || o.size === undefined)
          this.options.size = li.size();
  }

  // For whatever reason, .show() does not work in Safari...
  this.container.css('display', 'block');
  this.buttonNext.css('display', 'block');
  this.buttonPrev.css('display', 'block');

  this.funcNext   = function() { self.next(); };
  this.funcPrev   = function() { self.prev(); };
  this.funcResize = function() { self.reload(); };

  if (this.options.initCallback != null)
      this.options.initCallback(this, 'init');

  if ($.browser.safari) {
      this.buttons(false, false);
      $(window).bind('load', function() { self.setup(); });
  } else
      this.setup();
};

// Create shortcut for internal use
var $jc = $.jcarousel;

$jc.fn = $jc.prototype = {
  jcarousel: '0.2.3'
};

$jc.fn.extend = $jc.extend = $.extend;

$jc.fn.extend({
  /**
   * Setups the carousel.
   *
   * @name setup
   * @type undefined
   * @cat Plugins/jCarousel
   */
  setup: function() {
      this.first     = null;
      this.last      = null;
      this.prevFirst = null;
      this.prevLast  = null;
      this.animating = false;
      this.timer     = null;
      this.tail      = null;
      this.inTail    = false;

      if (this.locked) return;

      this.list.css(this.lt, this.pos(this.options.offset) + 'px');
      var p = this.pos(this.options.start);
      this.prevFirst = this.prevLast = null;
      this.animate(p, false);

      $(window).unbind('resize', this.funcResize).bind('resize', this.funcResize);
  },

  /**
   * Clears the list and resets the carousel.
   *
   * @name reset
   * @type undefined
   * @cat Plugins/jCarousel
   */
  reset: function() {
      this.list.empty();

      this.list.css(this.lt, '0px');
      this.list.css(this.wh, '10px');

      if (this.options.initCallback != null)
          this.options.initCallback(this, 'reset');

      this.setup();
  },

  /**
   * Reloads the carousel and adjusts positions.
   *
   * @name reload
   * @type undefined
   * @cat Plugins/jCarousel
   */
  reload: function() {
      if (this.tail != null && this.inTail)
          this.list.css(this.lt, $jc.intval(this.list.css(this.lt)) + this.tail);

      this.tail   = null;
      this.inTail = false;

      if (this.options.reloadCallback != null)
          this.options.reloadCallback(this);

      if (this.options.visible != null) {
          var self = this;
          var di = Math.ceil(this.clipping() / this.options.visible), wh = 0, lt = 0;
          $('li', this.list).each(function(i) {
              wh += self.dimension(this, di);
              if (i + 1 < self.first)
                  lt = wh;
          });

          this.list.css(this.wh, wh + 'px');
          this.list.css(this.lt, -lt + 'px');
      }

      this.scroll(this.first, false);
  },

  /**
   * Locks the carousel.
   *
   * @name lock
   * @type undefined
   * @cat Plugins/jCarousel
   */
  lock: function() {
      this.locked = true;
      this.buttons();
  },

  /**
   * Unlocks the carousel.
   *
   * @name unlock
   * @type undefined
   * @cat Plugins/jCarousel
   */
  unlock: function() {
      this.locked = false;
      this.buttons();
  },

  /**
   * Sets the size of the carousel.
   *
   * @name size
   * @type undefined
   * @param Number s The size of the carousel.
   * @cat Plugins/jCarousel
   */
  size: function(s) {
      if (s != undefined) {
          this.options.size = s;
          if (!this.locked)
              this.buttons();
      }

      return this.options.size;
  },

  /**
   * Checks whether a list element exists for the given index (or index range).
   *
   * @name get
   * @type bool
   * @param Number i The index of the (first) element.
   * @param Number i2 The index of the last element.
   * @cat Plugins/jCarousel
   */
  has: function(i, i2) {
      if (i2 == undefined || !i2)
          i2 = i;

      if (this.options.size !== null && i2 > this.options.size)
      	i2 = this.options.size;

      for (var j = i; j <= i2; j++) {
          var e = this.get(j);
          if (!e.length || e.hasClass('jcarousel-item-placeholder')) return false;
      }

      return true;
  },

  /**
   * Returns a jQuery object with list element for the given index.
   *
   * @name get
   * @type jQuery
   * @param Number i The index of the element.
   * @cat Plugins/jCarousel
   */
  get: function(i) {
      return $('.jcarousel-item-' + i, this.list);
  },

  /**
   * Adds an element for the given index to the list.
   * If the element already exists, it updates the inner html.
   * Returns the created element as jQuery object.
   *
   * @name add
   * @type jQuery
   * @param Number i The index of the element.
   * @param String s The innerHTML of the element.
   * @cat Plugins/jCarousel
   */
  add: function(i, s) {
      var e = this.get(i), old = 0, add = 0;

      if (e.length == 0) {
          var c, e = this.create(i), j = $jc.intval(i);
          while (c = this.get(--j)) {
              if (j <= 0 || c.length) {
                  j <= 0 ? this.list.prepend(e) : c.after(e);
                  break;
              }
          }
      } else
          old = this.dimension(e);

      e.removeClass(this.className('jcarousel-item-placeholder'));
      typeof s == 'string' ? e.html(s) : e.empty().append(s);

      var di = this.options.visible != null ? Math.ceil(this.clipping() / this.options.visible) : null;
      var wh = this.dimension(e, di) - old;

      if (i > 0 && i < this.first)
          this.list.css(this.lt, $jc.intval(this.list.css(this.lt)) - wh + 'px');

      this.list.css(this.wh, $jc.intval(this.list.css(this.wh)) + wh + 'px');

      return e;
  },

  /**
   * Removes an element for the given index from the list.
   *
   * @name remove
   * @type undefined
   * @param Number i The index of the element.
   * @cat Plugins/jCarousel
   */
  remove: function(i) {
      var e = this.get(i);

      // Check if item exists and is not currently visible
      if (!e.length || (i >= this.first && i <= this.last))
          return;

      var d = this.dimension(e);

      if (i < this.first)
          this.list.css(this.lt, $jc.intval(this.list.css(this.lt)) + d + 'px');

      e.remove();

      this.list.css(this.wh, $jc.intval(this.list.css(this.wh)) - d + 'px');
  },

  /**
   * Moves the carousel forwards.
   *
   * @name next
   * @type undefined
   * @cat Plugins/jCarousel
   */
  next: function() {
      this.stopAuto();

      if (this.tail != null && !this.inTail)
          this.scrollTail(false);
      else
          this.scroll(((this.options.wrap == 'both' || this.options.wrap == 'last') && this.options.size != null && this.last == this.options.size) ? 1 : this.first + this.options.scroll);
  },

  /**
   * Moves the carousel backwards.
   *
   * @name prev
   * @type undefined
   * @cat Plugins/jCarousel
   */
  prev: function() {
      this.stopAuto();

      if (this.tail != null && this.inTail)
          this.scrollTail(true);
      else
          this.scroll(((this.options.wrap == 'both' || this.options.wrap == 'first') && this.options.size != null && this.first == 1) ? this.options.size : this.first - this.options.scroll);
  },

  /**
   * Scrolls the tail of the carousel.
   *
   * @name scrollTail
   * @type undefined
   * @param Bool b Whether scroll the tail back or forward.
   * @cat Plugins/jCarousel
   */
  scrollTail: function(b) {
      if (this.locked || this.animating || !this.tail) return;
      var pos  = $jc.intval(this.list.css(this.lt));
      

      !b ? pos -= this.tail : pos += this.tail;
      this.inTail = !b;

      // Save for callbacks
      this.prevFirst = this.first;
      this.prevLast  = this.last;

      this.animate(pos);
  },

  /**
   * Scrolls the carousel to a certain position.
   *
   * @name scroll
   * @type undefined
   * @param Number i The index of the element to scoll to.
   * @param Bool a Flag indicating whether to perform animation.
   * @cat Plugins/jCarousel
   */
  scroll: function(i, a) {
      if (this.locked || this.animating) return;

      this.animate(this.pos(i), a);
  },

  /**
   * Prepares the carousel and return the position for a certian index.
   *
   * @name pos
   * @type Number
   * @param Number i The index of the element to scoll to.
   * @cat Plugins/jCarousel
   */
  pos: function(i) {
      if (this.locked || this.animating) return;

      if (this.options.wrap != 'circular') i = i < 1 ? 1 : (this.options.size && i > this.options.size ? this.options.size : i);

      var back = this.first > i;
      var pos  = $jc.intval(this.list.css(this.lt));

      // Create placeholders, new list width/height
      // and new list position
      var f = this.options.wrap != 'circular' && this.first <= 1 ? 1 : this.first;
      var c = back ? this.get(f) : this.get(this.last);
      var j = back ? f : f - 1;
      var e = null, l = 0, p = false, d = 0;

      while (back ? --j >= i : ++j < i) {
          e = this.get(j);
          p = !e.length;
          if (e.length == 0) {
              e = this.create(j).addClass(this.className('jcarousel-item-placeholder'));
              c[back ? 'before' : 'after' ](e);
          }

          c = e;
          d = this.dimension(e);

          if (p)
              l += d;

          if (this.first != null && (this.options.wrap == 'circular' || (j >= 1 && (this.options.size == null || j <= this.options.size))))
              pos = back ? pos + d : pos - d;
      }

      // Calculate visible items
      var clipping = this.clipping();
      var cache = [];
      var visible = 0, j = i, v = 0;
      var c = this.get(i - 1);

      while (++visible) {
          e = this.get(j);
          p = !e.length;
          if (e.length == 0) {
              e = this.create(j).addClass(this.className('jcarousel-item-placeholder'));
              // This should only happen on a next scroll
              c.length == 0 ? this.list.prepend(e) : c[back ? 'before' : 'after' ](e);
          }

          c = e;
          var d = this.dimension(e);
          if (d == 0) {
              alert('jCarousel: No width/height set for items. This will cause an infinite loop. Aborting...');
              return 0;
          }

          if (this.options.wrap != 'circular' && this.options.size !== null && j > this.options.size)
              cache.push(e);
          else if (p)
              l += d;

          v += d;

          if (v >= clipping)
              break;

          j++;
      }

       // Remove out-of-range placeholders
      for (var x = 0; x < cache.length; x++) cache[x].remove();

      // Resize list
      if (l > 0) {
          this.list.css(this.wh, this.dimension(this.list) + l + 'px');

          if (back) {
              pos -= l;
              this.list.css(this.lt, $jc.intval(this.list.css(this.lt)) - l + 'px');
          }
      }

      // Calculate first and last item
      var last = i + visible - 1;
      if (this.options.wrap != 'circular' && this.options.size && last > this.options.size) last = this.options.size;

      if (j > last) {
          visible = 0, j = last, v = 0;
          while (++visible) {
              var e = this.get(j--);
              if (!e.length)
                  break;
              v += this.dimension(e);
              if (v >= clipping)
                  break;
          }
      }

      var first = last - visible + 1;
      if (this.options.wrap != 'circular' && first < 1) first = 1;

      if (this.inTail && back) {
          pos += this.tail;
          this.inTail = false;
      }

      this.tail = null;
      
      if (this.options.wrap != 'circular' && last == this.options.size && (last - visible + 1) >= 1) {
          var m = $jc.margin(this.get(last), !this.options.vertical ? 'marginRight' : 'marginBottom');
          if ((v - m) > clipping)
              this.tail = v - clipping - m;
      }

      // Adjust position
      while (i-- > first) pos += this.dimension(this.get(i));

      // Save visible item range
      this.prevFirst = this.first;
      this.prevLast  = this.last;
      this.first     = first;
      this.last      = last;

      return pos;
  },

  /**
   * Animates the carousel to a certain position.
   *
   * @name animate
   * @type undefined
   * @param mixed p Position to scroll to.
   * @param Bool a Flag indicating whether to perform animation.
   * @cat Plugins/jCarousel
   */
  animate: function(p, a) {
      if (this.locked || this.animating)  return;

      this.animating = true;

      var self = this;
      var scrolled = function() {
          self.animating = false;

          if (p == 0)
              self.list.css(self.lt,  0);

          if (self.options.wrap == 'both' || self.options.wrap == 'last' || self.options.size == null || self.last < self.options.size)
              self.startAuto();

          self.buttons();
          self.notify('onAfterAnimation');
      };

      this.notify('onBeforeAnimation');

      // Animate
      if (!this.options.animation || a == false) {
          this.list.css(this.lt, p + 'px');
          scrolled();
      } 
      else {
          var o = !this.options.vertical ? {'left': p} : {'top': p};
          this.list.animate(o, this.options.animation, this.options.easing, scrolled);
      }
  },

  /**
   * Starts autoscrolling.
   *
   * @name auto
   * @type undefined
   * @param Number s Seconds to periodically autoscroll the content.
   * @cat Plugins/jCarousel
   */
  startAuto: function(s) {
      if (s != undefined)
          this.options.auto = s;

      if (this.options.auto == 0)
          return this.stopAuto();

      if (this.timer != null)
          return;

      var self = this;
      this.timer = setTimeout(function() { self.next(); }, this.options.auto * 1000);
  },

  /**
   * Stops autoscrolling.
   *
   * @name stopAuto
   * @type undefined
   * @cat Plugins/jCarousel
   */
  stopAuto: function() {
      if (this.timer == null)
          return;

      clearTimeout(this.timer);
      this.timer = null;
  },

  /**
   * Sets the states of the prev/next buttons.
   *
   * @name buttons
   * @type undefined
   * @cat Plugins/jCarousel
   */
  buttons: function(n, p) {
      if (n == undefined || n == null) {
          var n = !this.locked && this.options.size !== 0 && ((this.options.wrap && this.options.wrap != 'first') || this.options.size == null || this.last < this.options.size);
          if (!this.locked && (!this.options.wrap || this.options.wrap == 'first') && this.options.size != null && this.last >= this.options.size)
              n = this.tail != null && !this.inTail;
      }

      if (p == undefined || p == null) {
          var p = !this.locked && this.options.size !== 0 && ((this.options.wrap && this.options.wrap != 'last') || this.first > 1);
          if (!this.locked && (!this.options.wrap || this.options.wrap == 'last') && this.options.size != null && this.first == 1)
              p = this.tail != null && this.inTail;
      }

      var self = this;

      this.buttonNext[n ? 'bind' : 'unbind'](this.options.buttonNextEvent, this.funcNext)[n ? 'removeClass' : 'addClass'](this.className('jcarousel-next-disabled')).attr('disabled', n ? false : true);
      this.buttonPrev[p ? 'bind' : 'unbind'](this.options.buttonPrevEvent, this.funcPrev)[p ? 'removeClass' : 'addClass'](this.className('jcarousel-prev-disabled')).attr('disabled', p ? false : true);

      if (this.buttonNext.length > 0 && (this.buttonNext[0].jcarouselstate == undefined || this.buttonNext[0].jcarouselstate != n) && this.options.buttonNextCallback != null) {
          this.buttonNext.each(function() { self.options.buttonNextCallback(self, this, n); });
          this.buttonNext[0].jcarouselstate = n;
      }

      if (this.buttonPrev.length > 0 && (this.buttonPrev[0].jcarouselstate == undefined || this.buttonPrev[0].jcarouselstate != p) && this.options.buttonPrevCallback != null) {
          this.buttonPrev.each(function() { self.options.buttonPrevCallback(self, this, p); });
          this.buttonPrev[0].jcarouselstate = p;
      }
  },

  notify: function(evt) {
      var state = this.prevFirst == null ? 'init' : (this.prevFirst < this.first ? 'next' : 'prev');

      // Load items
      this.callback('itemLoadCallback', evt, state);

      if (this.prevFirst !== this.first) {
          this.callback('itemFirstInCallback', evt, state, this.first);
          this.callback('itemFirstOutCallback', evt, state, this.prevFirst);
      }

      if (this.prevLast !== this.last) {
          this.callback('itemLastInCallback', evt, state, this.last);
          this.callback('itemLastOutCallback', evt, state, this.prevLast);
      }

      this.callback('itemVisibleInCallback', evt, state, this.first, this.last, this.prevFirst, this.prevLast);
      this.callback('itemVisibleOutCallback', evt, state, this.prevFirst, this.prevLast, this.first, this.last);
  },

  callback: function(cb, evt, state, i1, i2, i3, i4) {
      if (this.options[cb] == undefined || (typeof this.options[cb] != 'object' && evt != 'onAfterAnimation'))
          return;

      var callback = typeof this.options[cb] == 'object' ? this.options[cb][evt] : this.options[cb];

      if (!$.isFunction(callback))
          return;

      var self = this;

      if (i1 === undefined)
          callback(self, state, evt);
      else if (i2 === undefined)
          this.get(i1).each(function() { callback(self, this, i1, state, evt); });
      else {
          for (var i = i1; i <= i2; i++)
              if (i !== null && !(i >= i3 && i <= i4))
                  this.get(i).each(function() { callback(self, this, i, state, evt); });
      }
  },

  create: function(i) {
      return this.format('<li></li>', i);
  },

  format: function(e, i) {
      var $e = $(e).addClass(this.className('jcarousel-item')).addClass(this.className('jcarousel-item-' + i));
      $e.attr('jcarouselindex', i);
      return $e;
  },

  className: function(c) {
      return c + ' ' + c + (!this.options.vertical ? '-horizontal' : '-vertical');
  },

  dimension: function(e, d) {
      var el = e.jquery != undefined ? e[0] : e;

      var old = !this.options.vertical ?
          el.offsetWidth + $jc.margin(el, 'marginLeft') + $jc.margin(el, 'marginRight') :
          el.offsetHeight + $jc.margin(el, 'marginTop') + $jc.margin(el, 'marginBottom');

      if (d == undefined || old == d)
          return old;

      var w = !this.options.vertical ?
          d - $jc.margin(el, 'marginLeft') - $jc.margin(el, 'marginRight') :
          d - $jc.margin(el, 'marginTop') - $jc.margin(el, 'marginBottom');

      $(el).css(this.wh, w + 'px');

      return this.dimension(el);
  },

  clipping: function() {
      return !this.options.vertical ?
          this.clip[0].offsetWidth - $jc.intval(this.clip.css('borderLeftWidth')) - $jc.intval(this.clip.css('borderRightWidth')) :
          this.clip[0].offsetHeight - $jc.intval(this.clip.css('borderTopWidth')) - $jc.intval(this.clip.css('borderBottomWidth'));
  },

  index: function(i, s) {
      if (s == undefined)
          s = this.options.size;

      return Math.round((((i-1) / s) - Math.floor((i-1) / s)) * s) + 1;
  }
});

$jc.extend({
  /**
   * Gets/Sets the global default configuration properties.
   *
   * @name defaults
   * @descr Gets/Sets the global default configuration properties.
   * @type Hash
   * @param Hash d A set of key/value pairs to set as configuration properties.
   * @cat Plugins/jCarousel
   */
  defaults: function(d) {
      return $.extend(defaults, d || {});
  },

  margin: function(e, p) {
      if (!e)
          return 0;

      var el = e.jquery != undefined ? e[0] : e;

      if (p == 'marginRight' && $.browser.safari) {
          var old = {'display': 'block', 'float': 'none', 'width': 'auto'}, oWidth, oWidth2;

          $.swap(el, old, function() { oWidth = el.offsetWidth; });

          old['marginRight'] = 0;
          $.swap(el, old, function() { oWidth2 = el.offsetWidth; });

          return oWidth2 - oWidth;
      }

      return $jc.intval($.css(el, p));
  },

  intval: function(v) {
      v = parseInt(v);
      return isNaN(v) ? 0 : v;
  }
});