/**
 * jquery.scrollable 1.0.2. Put your HTML scroll.
 * 
 * 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
 * Version : 1.0.2 - Tue Feb 24 2009 10:52:04 GMT-0000 (GMT+00:00)
 */
(function($){
    function fireEvent(opts,name,self,arg) {
        var fn=opts[name];
        if ($.isFunction(fn)) {
            try {
                return fn.call(self,arg);
            } catch (error) {
                if (opts.alert) {
                    alert("Error calling scrollable."+name+": "+error);
                } else {
                    throw error;
                }
                return false;
            }
        }
        return true;
    }
    
    var current=null;
    
    function Scrollable(root,conf) {
        var self=this;
        if (!current) {
            current=self;
        }
        
        var horizontal=!conf.vertical;
        var wrap=$(conf.items,root);
        var index=0;
        var navi=root.siblings(conf.navi).eq(0);
        var prev=root.siblings(conf.prev).eq(0);
        var next=root.siblings(conf.next).eq(0);
        var prevPage=root.siblings(conf.prevPage).eq(0);
        var nextPage=root.siblings(conf.nextPage).eq(0);
        $.extend(
            self,
            {
                getVersion:function(){return[1,0,1];},
                getIndex:function(){return index;},
                getConf:function(){return conf;},
                getSize:function(){return self.getItems().size();},
                getPageAmount:function(){return Math.ceil(this.getSize()/conf.size);},
                getPageIndex:function(){return Math.ceil(index/conf.size);},
                getRoot:function(){return root;},
                getItemWrap:function(){return wrap;},
                getItems:function(){return wrap.children();},
                seekTo:function(i,time,fn){
                    time=time||conf.speed;
                    if($.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;}
                    if(fireEvent(conf,"onBeforeSeek",self,i)===false){return self;}
                    if(horizontal){
                        var left=-(item.outerWidth(true)*i);
                        wrap.animate({left:left},time,conf.easing,fn?function(){fn.call(self);}:null);
                    } else {
                        var top=-(item.outerHeight(true)*i);
                        wrap.animate({top:top},time,conf.easing,fn?function(){fn.call(self);}:null);
                    }
                    if(navi.length){
                        var klass=conf.activeClass;
                        var page=Math.ceil(i/conf.size);
                        page=Math.min(page,navi.children().length-1);
                        navi.children().removeClass(klass).eq(page).addClass(klass);
                    }
                    if(i===0){
                        prev.add(prevPage).addClass(conf.disabledClass);
                    } else {
                        prev.add(prevPage).removeClass(conf.disabledClass);
                    }
                    if(i>=self.getSize()-conf.size){
                        next.add(nextPage).addClass(conf.disabledClass);
                    } else {
                        next.add(nextPage).removeClass(conf.disabledClass);
                    }
                    current=self;
                    index=i;
                    fireEvent(conf,"onSeek",self,i);
                    return self;
                },
                move:function(offset,time,fn){
                    var to=index+offset;
                    if(conf.loop&&to>(self.getSize()-conf.size)){to=0;}
                    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);},
                begin:function(time,fn){return this.seekTo(0,time,fn);},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;
                    if(!item.hasClass(klass)&&(index>=0||index<this.getSize())){
                        self.getItems().removeClass(klass);
                        item.addClass(klass);
                        var delta=Math.floor(conf.size/2);
                        var to=index-delta;
                        if(to>self.getSize()-conf.size){to--;}
                        if(to!==index){return this.seekTo(to,time,fn);}
                    }
                    return self;
                }
            }
        );
        if($.isFunction($.fn.mousewheel)){
            root.bind("mousewheel.scrollable",function(e,delta){var step=$.browser.opera?1:-1;self.move(delta>0?step:-step,50);return false;});
        }
        prev.addClass(conf.disabledClass).click(function(){self.prev();});
        next.click(function(){self.next();});
        nextPage.click(function(){self.nextPage();});
        prevPage.addClass(conf.disabledClass).click(function(){self.prevPage();});
        if(conf.keyboard){
            $(window).unbind("keypress.scrollable").bind("keypress.scrollable",function(evt){
                var el=current;
                if(!el){return;}
                if(horizontal&&(evt.keyCode==37||evt.keyCode==39)){el.move(evt.keyCode==37?-1:1);return evt.preventDefault();}
                if(!horizontal&&(evt.keyCode==38||evt.keyCode==40)){el.move(evt.keyCode==38?-1:1);return evt.preventDefault();}
                return true;
            });
        }
        function load(){
            navi.each(function(){
                var nav=$(this);
                if(nav.is(":empty")||nav.data("me")==self){
                    nav.empty();
                    nav.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);}
                        nav.append(item);
                    }
                } else {
                    var els=nav.children();
                    els.each(function(i){
                        var item=$(this);
                        item.attr("href",i);
                        if(i===0){item.addClass(conf.activeClass);}
                        item.click(function(){
                            nav.find("."+conf.activeClass).removeClass(conf.activeClass);
                            item.addClass(conf.activeClass);
                            self.setPage(item.attr("href"));
                        });
                    });
                }
            });
            if(conf.clickable){
                self.getItems().each(function(index,arg){
                    var el=$(this);
                    if(!el.data("set")){
                        el.bind("click.scrollable",function(){self.click(index);});
                        el.data("set",true);
                    }

                });
            }
            if(conf.hoverClass){
                self.getItems().hover(function(){$(this).addClass(conf.hoverClass);},function(){$(this).removeClass(conf.hoverClass);});
            }
            return self;
        }
        load();
        var timer=null;
        function setTimer(){
            timer=setInterval(function(){self.next();},conf.interval);
        }
        if(conf.interval>0){
            root.hover(function(){clearInterval(timer);},function(){setTimer();});
            setTimer();
        }
    }
    jQuery.prototype.scrollable=function(conf){
        var api=this.eq(typeof conf=='number'?conf:0).data("scrollable");
        if(api){return api;}
        var opts={
            size:5,
            vertical:false,
                clickable:true,
                loop:false,
                interval:0,
                speed:400,
                keyboard:true,
                activeClass:'active',
                disabledClass:'disabled',
                hoverClass:null,
                easing:'swing',
                items:'.items',
                prev:'.prev',
                next:'.next',
                prevPage:'.prevPage',
                nextPage:'.nextPage',
                navi:'.navi',
                naviItem:'a',
                onBeforeSeek:null,
                onSeek:null,
                alert:true
            };
            $.extend(opts,conf);
            this.each(function(){
                var el=new Scrollable($(this),opts);
                $(this).data("scrollable",el);
            });
        return this;
    };
})(jQuery);