/*!
 * thumbnail helper for fancybox
 * version: 1.0.7 (mon, 01 oct 2012)
 * @requires fancybox v2.0 or later
 *
 * usage:
 *     $(".fancybox").fancybox({
 *         helpers : {
 *             thumbs: {
 *                 width  : 50,
 *                 height : 50
 *             }
 *         }
 *     });
 *
 */
(function ($) {
	//shortcut for fancybox object
	var f = $.fancybox;

	//add helper object
	f.helpers.thumbs = {
		defaults : {
			width    : 50,       // thumbnail width
			height   : 50,       // thumbnail height
			position : 'bottom', // 'top' or 'bottom'
			source   : function ( item ) {  // function to obtain the url of the thumbnail image
				var href;

				if (item.element) {
					href = $(item.element).find('img').attr('src');
				}

				if (!href && item.type === 'image' && item.href) {
					href = item.href;
				}

				return href;
			}
		},

		wrap  : null,
		list  : null,
		width : 0,

		init: function (opts, obj) {
			var that = this,
				list,
				thumbwidth  = opts.width,
				thumbheight = opts.height,
				thumbsource = opts.source;

			//build list structure
			list = '';

			for (var n = 0; n < obj.group.length; n++) {
				list += '<li><a style="width:' + thumbwidth + 'px;height:' + thumbheight + 'px;" href="javascript:jquery.fancybox.jumpto(' + n + ');"></a></li>';
			}

			this.wrap = $('<div id="fancybox-thumbs"></div>').addclass(opts.position).appendto('body');
			this.list = $('<ul>' + list + '</ul>').appendto(this.wrap);

			//load each thumbnail
			$.each(obj.group, function (i) {
				var href = thumbsource( obj.group[ i ] );

				if (!href) {
					return;
				}

				$("<img />").load(function () {
					var width  = this.width,
						height = this.height,
						widthratio, heightratio, parent;

					if (!that.list || !width || !height) {
						return;
					}

					//calculate thumbnail width/height and center it
					widthratio  = width / thumbwidth;
					heightratio = height / thumbheight;

					parent = that.list.children().eq(i).find('a');

					if (widthratio >= 1 && heightratio >= 1) {
						if (widthratio > heightratio) {
							width  = math.floor(width / heightratio);
							height = thumbheight;

						} else {
							width  = thumbwidth;
							height = math.floor(height / widthratio);
						}
					}

					$(this).css({
						width  : width,
						height : height,
						top    : math.floor(thumbheight / 2 - height / 2),
						left   : math.floor(thumbwidth / 2 - width / 2)
					});

					parent.width(thumbwidth).height(thumbheight);

					$(this).hide().appendto(parent).fadein(300);

				}).attr('src', href);
			});

			//set initial width
			this.width = this.list.children().eq(0).outerwidth(true);

			this.list.width(this.width * (obj.group.length + 1)).css('left', math.floor($(window).width() * 0.5 - (obj.index * this.width + this.width * 0.5)));
		},

		beforeload: function (opts, obj) {
			//remove self if gallery do not have at least two items
			if (obj.group.length < 2) {
				obj.helpers.thumbs = false;

				return;
			}

			//increase bottom margin to give space for thumbs
			obj.margin[ opts.position === 'top' ? 0 : 2 ] += ((opts.height) + 15);
		},

		aftershow: function (opts, obj) {
			//check if exists and create or update list
			if (this.list) {
				this.onupdate(opts, obj);

			} else {
				this.init(opts, obj);
			}

			//set active element
			this.list.children().removeclass('active').eq(obj.index).addclass('active');
		},

		//center list
		onupdate: function (opts, obj) {
			if (this.list) {
				this.list.stop(true).animate({
					'left': math.floor($(window).width() * 0.5 - (obj.index * this.width + this.width * 0.5))
				}, 150);
			}
		},

		beforeclose: function () {
			if (this.wrap) {
				this.wrap.remove();
			}

			this.wrap  = null;
			this.list  = null;
			this.width = 0;
		}
	}

}(jquery));