//** Simple Controls Gallery- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)
//** February 6th, 09'- Updated to v 1.3:
	//1) Adds Description Panel to optionally show a textual description for each slide
	//2) In Auto Play mode, you can now set the number of cycles before gallery stops.
	//3) Inside oninit() and onslide(), keyword "this" now references the current gallery instance


var simpleGallery_navpanel={
	panel: {height:'75px', opacity:0.5}, //customize nav panel container
	images: ['media/actueletab.png', 'media/actueletab.png', 'media/actueletab.png', 'media/actueletab.png'], //nav panel images (in that order)
	imageSpacing: {offsetTop:[0, 0, 0], spacing:0}, //top offset of left, play, and right images, PLUS spacing between the 3 images
	slideduration: 500 //duration of slide up animation to reveal panel
}

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 //account for curimage being null if cookie is empty
	setting.ispaused=!setting.autoplay[0] //ispaused reflects current state of gallery, autoplay[0] indicates whether gallery is set to auto play
	setting.currentstep=0 //keep track of # of slides slideshow has gone through
	setting.totalsteps=setting.imagearray.length*setting.autoplay[2] //Total steps limit: # of images x # of user specified cycles
	setting.fglayer=0, setting.bglayer=1 //index of active and background layer (switches after each change of slide)
	setting.oninit=setting.oninit || function(){}
	setting.onslide=setting.onslide || function(){}
	var preloadimages=[], longestdesc=null //preload images
	setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""
	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]
	}
	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) { //if no wrapper DIV found
	        alert("Error: DIV with ID \"" + setting.wrapperid + "\" not found on page.")
	        return
	    }
	    setting.$gallerylayers = $('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 
			.css({ position: 'absolute', left: 0, top: 0 })
			.appendTo(setting.$wrapperdiv)
	    setting.gallerylayers = setting.$gallerylayers.get() //cache stacked DIVs as DOM objects
	    setting.navbuttons = simpleGallery.routines.addnavpanel(setting) //get 4 nav buttons DIVs as DOM objects
	    if (setting.longestdesc != "") //if at least one slide contains a description (feature is enabled)
	        setting.descdiv = simpleGallery.routines.adddescpanel(setting)
	    $(setting.navbuttons).filter('.navimages').css({ opacity: 0.8 })
			.bind('mouseover', function (e) {
			    $(this).css({ color: 'black', opacity: 0.8, backgroundPosition: '-170px 0px' });
			    slideshow.navigate($(this).attr("imgid"));
			    slideshow.navigate('playpause');
			})
            .bind('mouseout', function (e) {
                $(this).css({ color:'white', opacity: 0.8, backgroundPosition: '0px 0px' });
                slideshow.navigate('playpause');
            })
			.bind('click', function (e) {
			    var keyword = e.target.title.toLowerCase()
			    slideshow.navigate(keyword) //assign behavior to nav images
			})
	    setting.$wrapperdiv.bind('mouseenter', function () { slideshow.showhidenavpanel('show') })
	    setting.$wrapperdiv.bind('mouseleave', function () { slideshow.showhidenavpanel('hide') })
	    slideshow.showslide(setting.curimage) //show initial slide
	    setting.oninit.call(slideshow) //trigger oninit() event
	    $(window).bind('unload', function () { //clean up and persist
	        $(slideshow.setting.navbuttons).unbind()
	        if (slideshow.setting.persist) //remember last shown image's index
	            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") //catches 2 gallerylayer divs, gallerystatus div
	                        slideshow.setting[k][i].innerHTML = null
	                    slideshow.setting[k][i] = null
	                }
	            }
	            if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
	                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 any of the nav buttons are clicked on, set totalsteps limit to an "unreachable" number 
		if (!isNaN(parseInt(keyword))){
			this.showslide(parseInt(keyword))
		}
		else if (/(prev)|(next)/i.test(keyword)){
			this.showslide(keyword.toLowerCase())
		}
		else{ //if play|pause button
			var slideshow=this
			var $playbutton=$(this.setting.navbuttons).eq(1)
			if (!this.setting.ispaused){ //if pause Gallery
				this.setting.autoplay[0]=false
				$playbutton.attr({title:'Play', src:simpleGallery_navpanel.images[1]})
			}
			else if (this.setting.ispaused){ //if play Gallery
				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}) //background layer becomes foreground
			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:
				clearTimeout(setting.playtimer)
				setting.gallerylayers[setting.bglayer].innerHTML=null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
				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")
				}
			}) //end callback function
		setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background
		setting.fglayer=setting.bglayer
		setting.bglayer=(setting.bglayer==0)? 1 : 0
//		$(setting.navbuttons[setting.curimage]).css("background-position-x", "0px")
//		$(setting.navbuttons[imgindex]).css("background-position-x", "-170px")
		var navimages = $(setting.navbuttons).filter('.navimages')
        $(navimages[setting.curimage]).css({ color:'white', backgroundPosition: '0px 0px' })
		$(navimages[imgindex]).css({color:'black', backgroundPosition: '-170px 0px' })
		setting.curimage = imgindex
		//setting.navbuttons[3].innerHTML=(setting.curimage+1) + '/' + setting.imagearray.length
		if (setting.imagearray[imgindex][3]){ //if this slide contains a description
			setting.$descpanel.css({visibility:'visible'})
			setting.descdiv.innerHTML=setting.imagearray[imgindex][3]
		}
		else if (setting.longestdesc!=""){ //if at least one slide contains a description (feature is enabled)
			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!="") //if at least one slide contains a description (feature is enabled)
//			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' : '' //hyperlink slide?
		layerHTML+='<img src="'+imgelement[0]+'" style="border-width:0" />'
		layerHTML+=(imgelement[1])? '</a>' : ''
		return layerHTML //return HTML for this layer
	},

	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 += '<div imgid="' + i +'" class="navimages" style="' + imgstyle + '">' + setting.imagearray[i][3] + '</div> '
		}
		//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)
		$('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
			.css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})
			 //"navpanelbg" div
			.eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, color:'white'}).html(interfaceHTML).end() //"navpanelfg" div
			.appendTo(setting.$navpanel)
		return setting.$navpanel.find('.navimages, div.gallerystatus').get() //return 4 nav related images and DIVs as DOM objects
	},

	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() //"gallerydescbg" div
			.eq(1).css({color:'white'}).end() //"gallerydescfg" div
			.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 - setting.descpanelheight, height: setting.descpanelheight }).find('div').css({ height: '100%' })
		return setting.$descpanel.find('div.gallerydesctext').get(0) //return gallery description DIV as a DOM object
	},

	getCookie:function(Name){ 
		var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
		if (document.cookie.match(re)) //if cookie found
			return document.cookie.match(re)[0].split("=")[1] //return its value
		return null
	},

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