/**
 * jquery.scrollable 1.0.5 - Scroll your HTML with eye candy.
 * 
 * Copyright (c) 2009 Tero Piirainen
 * http://flowplayer.org/tools/scrollable.html
 *
 * Dual licensed under MIT and GPL 2+ licenses
 * http://www.opensource.org/licenses
 *
 * Launch  : March 2008
 * Date: 2009-06-12 11:02:45 +0000 (Fri, 12 Jun 2009)
 * Revision: 1911 
 */

var thisCarousel = "";

(function($) {
	// static constructs
	$.tools = $.tools || {version: {}};

	$.tools.version.scrollable = '1.0.5';

	var current = null;

	// constructor
	function Scrollable(root, conf) {
		// current instance
		var self = this;
		if (!current) { current = self; }

		// generic binding function
		function bind(name, fn) {
			$(self).bind(name, function(e, args) {
				if (fn && fn.call(this, args.index) === false && args) {
					args.proceed = false;
				}
			});

			return self;
		}

		// bind all callbacks from configuration
		$.each(conf, function(name, fn) {
			if($.isFunction(fn)) { bind(name, fn); }
		});

		// horizontal flag
		var horizontal = !conf.vertical;				

		// wrap (root elements for items)
		var wrap = $(conf.items, root);

		// current index
		var index = 0;

		function find(query, ctx) {
			return query.indexOf("#") != -1 ? $(query).eq(0) : ctx.siblings(query).eq(0);	
		}

		// get handle to navigational elements
		var navi     = find(conf.navi, root);
		var prev     = find(conf.prev, root);
		var next     = find(conf.next, root);
		var prevPage = find(conf.prevPage, root);
		var nextPage = find(conf.nextPage, root);

		// methods
		$.extend(self, {
			getIndex: function() {
				return index;	
			},

			getConf: function() {
				return conf;	
			},

			getSize: function() {
				return self.getItems().size();	
			},

			getPageAmount: function() {
				return Math.ceil(this.getSize() / conf.size); 	
			},

			getPageIndex: function() {
				return Math.ceil(index / conf.size);	
			},

			getRoot: function() {
				return root;	
			},

			getItemWrap: function() {
				return wrap;
			},

			getItems: function() {
				return wrap.children();
			},

			getVisibleItems: function() {
				return self.getItems().slice(index, index + conf.size);
			},

			// ADDED 2009-08-06
			selectedValue: function() {
				var item = self.getItems().eq(index);
				return item.attr("data-value");
			},

			// ADDED 2010-01-08
			selectedItem: function() {
				return self.getItems().eq(index);
			},

			/* all seeking functions depend on this */
			// MODIFIED 2009-09-23
			seekTo: function(i, time, fn) {
				// Do Not Move If Invisible
				if(self.getRoot().is(":visible") == false) {
					return false;
				}

				var klass      = conf.activeClass;
				var fire_event = true;

				if(arguments.length > 3) {
					fire_event = arguments[3];
				}

				// remove active class
				self.getItems().removeClass(klass);

				// default speed
				if(time === undefined) { time = conf.speed; }

				// function given as second argument
				if($.isFunction(time)) {
					fn = time;
					time = conf.speed;
				}

				if(i < 0) { i = 0; }
				if(i > self.getSize() - conf.size) { return self; }

				var item = self.getItems().eq(i);
				if(!item.length) { return self; }

				// onBeforeSeek
				var p = {index: i, proceed: true};
				$(self).trigger("onBeforeSeek", p);
				if (!p.proceed) { return self; }

				if(horizontal) {
 					var left = -item.position().left;
					wrap.animate({left: left}, time, conf.easing, fn ? function() { fn.call(self); } : null);
				} else {
					var top = -item.position().top;
					wrap.animate({top: top}, time, conf.easing, fn ? function() { fn.call(self); } : null);
				}

				item.addClass(klass);

				// navi status update
				if(navi.length) {
					var page = Math.ceil(i / conf.size);
					page = Math.min(page, navi.children().length - 1);
					navi.children().removeClass(klass).eq(page).addClass(klass);
				}

				// prev buttons disabled flag
				prev.add(prevPage).removeClass(conf.disabledClass);

				if(i === 0) {
					prev.add(prevPage).addClass(conf.disabledClass);
				}

				// next buttons disabled flag
				next.add(nextPage).removeClass(conf.disabledClass);

				if(i >= self.getSize() - conf.size) {
					next.add(nextPage).addClass(conf.disabledClass);
				}

				current = self;
				index = i;

				// onSeek after index being updated
				if(fire_event == true) {
					$(self).trigger("onSeek",{index: i});
				}

				return self; 
			},

			move: function(offset, time, fn) {
				var to = index + offset;

				if(conf.loop) {
					if(to > (self.getSize() - conf.size)) {
						to = 0;
					} else {
						if(to < 0) {
							to = (self.getSize() - conf.size);
						}
					}
				}

				return this.seekTo(to, time, fn);
			},

			next: function(time, fn) {
				return this.move(1, time, fn);
			},

			prev: function(time, fn) {
				return this.move(-1, time, fn);
			},

			movePage: function(offset, time, fn) {
				return this.move(conf.size * offset, time, fn);
			},

			setPage: function(page, time, fn) {
				var size = conf.size;
				var index = size * page;
				var lastPage = index + size >= this.getSize();
				if(lastPage) {
					index = this.getSize() - conf.size;
				}
				return this.seekTo(index, time, fn);
			},

			prevPage: function(time, fn) {
				return this.setPage(this.getPageIndex() - 1, time, fn);
			},

			nextPage: function(time, fn) {
				return this.setPage(this.getPageIndex() + 1, time, fn);
			},

			// ADDED 2009-09-23
			constrainWidth: function() {
				var numSlides = self.getSize();
				var widthPerSlide = Math.ceil(self.getRoot().width() / conf.size);
	
				// Reposition and Show the Slides
				var thisXPos = 0;
	
				for(i = 0; i < numSlides; i++) {
					thisSlide = self.getItems().eq(i);
					thisXPos = (widthPerSlide) * (i);
					thisSlide.css("left", thisXPos);
				}
			},

			// ADDED 2009-09-23
			constrainHeight: function() {
				var numSlides = self.getSize();
				var heightPerSlide = Math.ceil(self.getRoot().height() / conf.size);
	
				// Reposition and Show the Slides
				var thisYPos = 0;
	
				for (i = 0; i < numSlides; i++) {
					thisSlide = self.getItems().eq(i);
					thisYPos = (heightPerSlide) * (i);
					thisSlide.css("top", thisYPos);
				}
			},

			// MODIFIED 2009-09-23
			begin: function(time, fn) {
				// Only Begin When Visible
				if(self.getRoot().is(":visible") == false) {
					setTimeout(function() {
						self.begin(time,fn);
					},1500);

					return false;
				}

				var startIndex = 0;
				var thisSlide  = "";
				var selected   = "";
				var numSlides  = self.getSize();

				if(conf.interval > 0) {
					setTimer();
				}

				if(horizontal == true) {
					self.constrainWidth();
				} else {
					self.constrainHeight();
				}

				self.getRoot().children(".loading").hide();
				self.getItemWrap().css("left",0).hide().show();

				for(var i = 0; i < numSlides; i++) {
					var thisSlide = self.getItems().eq(i);
					var selected  = jQuery(thisSlide).attr("data-selected");

					if(selected) {
						selected = selected.toLowerCase();

						if(selected == "true" || selected == "yes" || parseInt(selected) == 1) {
							startIndex = i;
							break;
						}
					}
				}

				$(self).trigger("onBegin",{index: startIndex});

				return this.seekTo(startIndex, time, fn, false);
			},

			end: function(time, fn) {
				return this.seekTo(this.getSize() - conf.size, time, fn);
			},

			reload: function() {
				return load();	
			},

			click: function(index, time, fn) {
				var item = self.getItems().eq(index);
				var klass = conf.activeClass;

				// check that index is sane
				if (index < 0 || index >= this.getSize()) { return self; }

				// special case with two items
				if(conf.size == 2) {
					if (index == self.getIndex()) { index--; }
					self.getItems().removeClass(klass);
					item.addClass(klass);
					return this.seekTo(index, time, fn);
				}

				if(!item.hasClass(klass)) {
					self.getItems().removeClass(klass);
					item.addClass(klass);
					var delta = Math.floor(conf.size / 2);
					var to = index - delta;

					// next to last item must work
					if (to > self.getSize() - conf.size) {
						to = self.getSize() - conf.size;
					}

					if (to !== index) {
						return this.seekTo(to, time, fn);
					}
				}

				return self;
			},

			// callback functions
			onBeforeSeek: function(fn) {
				return bind("onBeforeSeek", fn);
			},

			onSeek: function(fn) {
				return bind("onSeek", fn);
			},

			onBegin: function(fn) {
				return bind("onBegin", fn);
			}
		});

		// mousewheel
		if($.isFunction($.fn.mousewheel)) {
			root.bind("mousewheel.scrollable", function(e, delta) {
				// opera goes to opposite direction
				var step = $.browser.opera ? 1 : -1;

				self.move(delta > 0 ? step : -step, 50);
				return false;
			});
		}

		// prev button
		prev.addClass(conf.disabledClass).click(function() {
			self.prev();
		});

		// next button
		next.click(function() {
			self.next();
		});

		// prev page button
		nextPage.click(function() {
			self.nextPage();
		});

		// next page button
		prevPage.addClass(conf.disabledClass).click(function() { 
			self.prevPage(); 
		});

		// keyboard
		if(conf.keyboard) {
			// keyboard works on one instance at the time. thus we need to unbind first
			$(document).unbind("keydown.scrollable").bind("keydown.scrollable", function(evt) {
				var el = current;	

				if(!el || evt.altKey || evt.ctrlKey) { return; }

				if(horizontal && (evt.keyCode == 37 || evt.keyCode == 39)) {
					el.move(evt.keyCode == 37 ? -1 : 1);
					return evt.preventDefault();
				}

				if(!horizontal && (evt.keyCode == 38 || evt.keyCode == 40)) {
					el.move(evt.keyCode == 38 ? -1 : 1);
					return evt.preventDefault();
				}

				return true;
			});
		}

		// navi
		function load() {
			// generate new entries
			if(navi.is(":empty") || navi.data("me") == self) {
				navi.empty();
				navi.data("me", self);

				for(var i = 0; i < self.getPageAmount(); i++) {
					var item = $("<" + conf.naviItem + "/>").attr("href", i).click(function(e) {					
						var el = $(this);
						el.parent().children().removeClass(conf.activeClass);
						el.addClass(conf.activeClass);
						self.setPage(el.attr("href"));
						return e.preventDefault();
					});

					if (i === 0) { item.addClass(conf.activeClass); }
					navi.append(item);
				}
			// assign onClick events to existing entries
			} else {
				// find a entries first -> syntaxically correct
				var els = navi.children();

				els.each(function(i) {
					var item = $(this);
					item.attr("href", i);
					if (i === 0) { item.addClass(conf.activeClass); }

					item.click(function() {
						navi.find("." + conf.activeClass).removeClass(conf.activeClass);
						item.addClass(conf.activeClass);
						self.setPage(item.attr("href"));
					});
				});
			}

			// item.click()
			if(conf.clickable) {
				self.getItems().each(function(index, arg) {
					var el = $(this);
					if (!el.data("set")) {
						el.bind("click.scrollable", function() {
							self.click(index);
						});
						el.data("set", true);
					}
				});
			}

			// hover
			if(conf.hoverClass) {
				self.getItems().hover(function() {
					$(this).addClass(conf.hoverClass);
				}, function() {
					$(this).removeClass(conf.hoverClass);
				});
			}

			// prev buttons disabled flag
			prev.add(prevPage).removeClass(conf.disabledClass).addClass(conf.disabledClass);
			next.add(nextPage).removeClass(conf.disabledClass).addClass(conf.disabledClass);

			return self;
		}

		load();

		// interval stuff
		var timer = null;

		function setTimer() {
			// do not start additional timer if already exists
			if (timer) { return; }

			// construct new timer
			timer = setInterval(function() {
				// check if interval is being changed dynamically during runtime
				if(conf.interval === 0) {
					killTimer();
					return;
				}
				self.next();
			}, conf.interval);
		}

		function killTimer() {
			clearInterval(timer);
			timer = 0;
		}

		if(conf.interval > 0) {
			// when mouse enters, autoscroll stops
			root.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});

			navi.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});

			prev.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});

			next.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});

			prevPage.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});

			nextPage.hover(function() {
				killTimer();
			}, function() {
				setTimer();
			});
		}

		// ADDED 2009-07-07
		self.begin();
	}

	// jQuery plugin implementation
	$.fn.scrollable = function(conf) {
		// already constructed --> return API
		var el = this.eq(typeof conf == 'number' ? conf : 0).data("scrollable");
		if (el) { return el; }

		var opts = {
			// basics
			size: 5,
			vertical:false,
			clickable: true,
			loop: false,
			interval: 0,
			speed: 400,
			keyboard: true,

			// other
			activeClass:'active',
			disabledClass: 'disabled',
			hoverClass: null,
			easing: 'swing',

			// navigational elements
			items: '.items',
			prev: '.prev',
			next: '.next',
			prevPage: '.prevPage',
			nextPage: '.nextPage',
			navi: '.navi',
			naviItem: 'a',
			api:false,

			// callbacks
			onBeforeSeek: null,
			onSeek: null,
			onBegin: null
		};

		$.extend(opts, conf);

		if(typeof console != "undefined") {
			console.log(opts.size);
		}

		this.each(function() {
			el = new Scrollable($(this), opts);
			$(this).data("scrollable", el);
		});

		return opts.api ? el: this;
	};
})(jQuery);