var simpleGallery_navpanel={
	loadinggif: '/img/ajaxload.gif',
	panel: {height:'45px', opacity:0.5, paddingTop:'5px', fontStyle:'bold 11px Verdana'},
	images: [ '/img/left.gif', '/img/play2.gif', '/img/right.gif', '/img/pause.gif'],
	imageSpacing: {offsetTop:[-4, 0, -4], spacing:10},
	slideduration: 500
};

function simpleGallery(settingarg){
	this.setting=settingarg;
	settingarg=null;
	var setting=this.setting;
	setting.panelheight=(parseInt(setting.navpanelheight)>5)? parseInt(setting.navpanelheight) : parseInt(simpleGallery_navpanel.panel.height);
	setting.fadeduration=parseInt(setting.fadeduration);
	setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 0;
	setting.curimage=setting.curimage || 0;
	setting.preloadfirst=(!jQuery.Deferred)? false : (typeof setting.preloadfirst!="undefined")? setting.preloadfirst : true;
	setting.ispaused=!setting.autoplay[0];
	setting.currentstep=0;
	setting.totalsteps=setting.imagearray.length*setting.autoplay[2];
	setting.fglayer=0, setting.bglayer=1;
	setting.oninit=setting.oninit || function(){};
	setting.onslide=setting.onslide || function(){};
	var preloadimages=[], longestdesc=null, loadedimages=0;
	var dfd = (setting.preloadfirst)? jQuery.Deferred() : {resolve:function(){}, done:function(f){f()}};
	setting.longestdesc="";
	setting.$loadinggif=(function(){
		var loadgif=new Image();
		loadgif.src=simpleGallery_navpanel.loadinggif;
		return jQuery(loadgif).css({verticalAlign:'middle'}).wrap('<div style="position:absolute;text-align:center;width:100%;height:100%" />').parent();
	})();
	for (var i=0; i<setting.imagearray.length; i++){
		preloadimages[i]=new Image();
		preloadimages[i].src=setting.imagearray[i][0];
		if (setting.imagearray[i][3] && setting.imagearray[i][3].length>setting.longestdesc.length)
			setting.longestdesc=setting.imagearray[i][3];
		jQuery(preloadimages[i]).bind('load error', function(){
			loadedimages++;
			if (loadedimages==setting.imagearray.length){
				dfd.resolve();
			}
		});
	};
	var slideshow=this;
	jQuery(document).ready(function($){
		var setting=slideshow.setting;
		setting.$wrapperdiv=$('#'+setting.wrapperid).css({position:'relative', visibility:'visible', background:'black', overflow:'hidden', width:setting.dimensions[0], height:setting.dimensions[1]}).empty();//main gallery DIV
		if (setting.$wrapperdiv.length==0){
			alert("Error: DIV with ID \""+setting.wrapperid+"\" not found on page.");
			return;
		}
		setting.$gallerylayers=$('<div class="gallerylayer"></div><div class="gallerylayer"></div>')
			.css({position:'absolute', left:0, top:0})
			.appendTo(setting.$wrapperdiv);
		setting.$loadinggif.css({top:setting.dimensions[1]/2-30}).appendTo(setting.$wrapperdiv);;
		setting.gallerylayers=setting.$gallerylayers.get();
		setting.navbuttons=simpleGallery.routines.addnavpanel(setting);
		if (setting.longestdesc!="")
			setting.descdiv=simpleGallery.routines.adddescpanel(setting);
		$(setting.navbuttons).filter('img.navimages').css({opacity:0.8})
			.bind('mouseover mouseout', function(e){
				$(this).css({opacity:(e.type=="mouseover")? 1 : 0.8});
			})
			.bind('click', function(e){
				var keyword=e.target.title.toLowerCase();
				slideshow.navigate(keyword);
			});
		dfd.done(function(){
			setting.$loadinggif.remove();
			setting.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show')});
			setting.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide')});
			slideshow.showslide(setting.curimage);
			setting.oninit.call(slideshow) ;
			$(window).bind('unload', function(){
				$(slideshow.setting.navbuttons).unbind();
				if (slideshow.setting.persist)
					simpleGallery.routines.setCookie("gallery-"+setting.wrapperid, setting.curimage);
				jQuery.each(slideshow.setting, function(k){
					if (slideshow.setting[k] instanceof Array){
						for (var i=0; i<slideshow.setting[k].length; i++){
							if (slideshow.setting[k][i].tagName=="DIV")
								slideshow.setting[k][i].innerHTML=null;
							slideshow.setting[k][i]=null;
						}
					};
					if (slideshow.setting[k].innerHTML)
						slideshow.setting[k].innerHTML=null;
					slideshow.setting[k]=null;
				});
				slideshow=slideshow.setting=null;
			})
		})
	})
};

simpleGallery.prototype={

	navigate:function(keyword){
		clearTimeout(this.setting.playtimer);
		this.setting.totalsteps=100000;
		if (!isNaN(parseInt(keyword))){
			this.showslide(parseInt(keyword));
		}
		else if (/(prev)|(next)/i.test(keyword)){
			this.showslide(keyword.toLowerCase());
		}
		else{
			var slideshow=this;
			var $playbutton=$(this.setting.navbuttons).eq(1);
			if (!this.setting.ispaused){
				this.setting.autoplay[0]=false;
				$playbutton.attr({title:'Play', src:simpleGallery_navpanel.images[1]});
			}
			else if (this.setting.ispaused){
				this.setting.autoplay[0]=true;
				this.setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, this.setting.autoplay[1]);
				$playbutton.attr({title:'Pause', src:simpleGallery_navpanel.images[3]});
			};
			slideshow.setting.ispaused=!slideshow.setting.ispaused;
		}
	},

	showslide:function(keyword){
		var slideshow=this;
		var setting=slideshow.setting;
		var totalimages=setting.imagearray.length;
		var imgindex=(keyword=="next")? (setting.curimage<totalimages-1? setting.curimage+1 : 0)
			: (keyword=="prev")? (setting.curimage>0? setting.curimage-1 : totalimages-1)
			: Math.min(keyword, totalimages-1);
		setting.gallerylayers[setting.bglayer].innerHTML=simpleGallery.routines.getSlideHTML(setting.imagearray[imgindex]);
		setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0})
			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){
				clearTimeout(setting.playtimer);
				setting.gallerylayers[setting.bglayer].innerHTML=null;
				try{
					setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage);
				}catch(e){
					alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e);
				}
				setting.currentstep+=1;
				if (setting.autoplay[0]){
					if (setting.currentstep<=setting.totalsteps)
						setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1]);
					else
						slideshow.navigate("play/pause");
				}
			});
		setting.gallerylayers[setting.fglayer].style.zIndex=999;
		setting.fglayer=setting.bglayer;
		setting.bglayer=(setting.bglayer==0)? 1 : 0;
		setting.curimage=imgindex;
		setting.navbuttons[3].innerHTML=(setting.curimage+1) + '/' + setting.imagearray.length;
		if (setting.imagearray[imgindex][3]){
			setting.$descpanel.css({visibility:'visible'});
			setting.descdiv.innerHTML=setting.imagearray[imgindex][3];
		}
		else if (setting.longestdesc!=""){
			setting.descdiv.innerHTML=null;
			setting.$descpanel.css({visibility:'hidden'});

		}
	},

	showhidenavpanel:function(state){
		var setting=this.setting;
		var endpoint=(state=="show")? setting.dimensions[1]-setting.panelheight : this.setting.dimensions[1];
		setting.$navpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration);
		if (setting.longestdesc!="")
			this.showhidedescpanel(state);
	},

	showhidedescpanel:function(state){
		var setting=this.setting;
		var endpoint=(state=="show")? 0 : -setting.descpanelheight;
		setting.$descpanel.stop().animate({top:endpoint}, simpleGallery_navpanel.slideduration);
	}
};

simpleGallery.routines={

	getSlideHTML:function(imgelement){
		var layerHTML=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'">\n' : '';
		layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />';
		layerHTML+=(imgelement[1])? '</a>' : '';
		return layerHTML;
	},

	addnavpanel:function(setting){
		var interfaceHTML='';
		for (var i=0; i<3; i++){
			var imgstyle='position:relative; border:0; cursor:hand; cursor:pointer; top:'+simpleGallery_navpanel.imageSpacing.offsetTop[i]+'px; margin-right:'+(i!=2? simpleGallery_navpanel.imageSpacing.spacing+'px' : 0);
			var title=(i==0? 'Prev' : (i==1)? (setting.ispaused? 'Play' : 'Pause') : 'Next');
			var imagesrc=(i==1)? simpleGallery_navpanel.images[(setting.ispaused)? 1 : 3] : simpleGallery_navpanel.images[i];
			interfaceHTML+='<img class="navimages" title="' + title + '" src="'+ imagesrc +'" style="'+imgstyle+'" /> ';
		}
		interfaceHTML+='<div class="gallerystatus" style="margin-top:1px">' + (setting.curimage+1) + '/' + setting.imagearray.length + '</div>';
		setting.$navpanel=$('<div class="navpanellayer"></div>')
			.css({position:'absolute', width:'100%', height:setting.panelheight, left:0, top:setting.dimensions[1], font:simpleGallery_navpanel.panel.fontStyle, zIndex:'1001'})
			.appendTo(setting.$wrapperdiv);
		$('<div class="navpanelbg"></div><div class="navpanelfg"></div>')
			.css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})
			.eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end()
			.eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, textAlign:'center', color:'white'}).html(interfaceHTML).end()
			.appendTo(setting.$navpanel);
		return setting.$navpanel.find('img.navimages, div.gallerystatus').get();
	},

	adddescpanel:function(setting){
		setting.$descpanel=$('<div class="gallerydesc"><div class="gallerydescbg"></div><div class="gallerydescfg"><div class="gallerydesctext"></div></div></div>')
			.css({position:'absolute', width:'100%', left:0, top:-1000, zIndex:'1001'})
			.find('div').css({position:'absolute', left:0, top:0, width:'100%'})
			.eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end()
			.eq(1).css({color:'white'}).end()
			.eq(2).html(setting.longestdesc).end().end()
			.appendTo(setting.$wrapperdiv);
		var $gallerydesctext=setting.$descpanel.find('div.gallerydesctext');
		setting.descpanelheight=$gallerydesctext.outerHeight();
		setting.$descpanel.css({top:-setting.descpanelheight, height:setting.descpanelheight}).find('div').css({height:'100%'});
		return setting.$descpanel.find('div.gallerydesctext').get(0);
	},

	getCookie:function(Name){ 
		var re=new RegExp(Name+"=[^;]+", "i");
		if (document.cookie.match(re))
			return document.cookie.match(re)[0].split("=")[1];
		return null;
	},

	setCookie:function(name, value){
		document.cookie = name+"=" + value + ";path=/";
	}
}