//** 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

/*Here's a tip- you can effectively hide the Navigational Panel altogether by setting panel.height to 0. If you do so, With the Panel hidden, you can still let users control the Gallery via custom controls that call galleryinstance.navigate(). See "Customizing: The navigate() method, oninit() and onslide event handlers" for more info.
*/
var simpleGallery_navpanel={
	panel: {height:'30px', opacity:0.5, paddingTop:'5px', fontStyle:'bold 10px Arial'}, //customize nav panel container
	images: [ 'imgs/clients_slideshow_controls/left.gif', 'imgs/clients_slideshow_controls/play.gif', 'imgs/clients_slideshow_controls/right.gif', 'imgs/clients_slideshow_controls/pause.gif'], //nav panel images (in that order)
	imageSpacing: {offsetTop:[-4, 0, -4], spacing:10}, //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('img.navimages').css({opacity:0.8})
			.bind('mouseover mouseout', function(e){
				$(this).css({opacity:(e.type=="mouseover")? 1 : 0.8})
			})
			.bind('click', function(e){
				var keyword=e.target.title.toLowerCase()
				slideshow.navigate(keyword) //assign behavior to nav images
			})
		setting.$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.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}) //background layer becomes foreground
			.stop().css({opacity:0}).animate({opacity:1}, setting.fadeduration, function(){ //Callback function after fade animation is complete:
				clearTimeout(setting.playtimer)
				setting.gallerylayers[setting.bglayer].innerHTML=null  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
				try{
					setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
				}catch(e){
					alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: "+e)
				}
				setting.currentstep+=1
				if (setting.autoplay[0]){
					if (setting.currentstep<=setting.totalsteps)
						setting.playtimer=setTimeout(function(){slideshow.showslide('next')}, setting.autoplay[1])
					else
						slideshow.navigate("play/pause")
				}
			}) //end callback function
		setting.gallerylayers[setting.fglayer].style.zIndex=999 //foreground layer becomes background
		setting.fglayer=setting.bglayer
		setting.bglayer=(setting.bglayer==0)? 1 : 0
		setting.curimage=imgindex
		setting.navbuttons[3].innerHTML=(setting.curimage+1) + '/' + setting.imagearray.length
		if (setting.imagearray[imgindex][3]){ //if this slide contains a description
			setting.$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+='<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)
		$('<div class="navpanelbg"></div><div class="navpanelfg"></div>') //create inner nav panel DIVs
			.css({position:'absolute', left:0, top:0, width:'100%', height:'100%'})
			.eq(0).css({background:'black', opacity:simpleGallery_navpanel.panel.opacity}).end() //"navpanelbg" div
			.eq(1).css({paddingTop:simpleGallery_navpanel.panel.paddingTop, textAlign:'center', color:'white'}).html(interfaceHTML).end() //"navpanelfg" div
			.appendTo(setting.$navpanel)
		return setting.$navpanel.find('img.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, 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=/"
	}
}