//** 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:'45px', opacity:0.5, paddingTop:'5px', fontStyle:'bold 11px Arial'}, //customize nav panel container
	images: ['Scripts/left.gif', 'Scripts/play.gif', 'Scripts/right.gif', 'Scripts/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.shownavpanel = parseInt(setting.shownavpanel)
	setting.horizontalalign = setting.horizontalalign
	setting.verticalalign = setting.verticalalign
	setting.random = setting.random
	setting.curimage=(setting.persist)? simpleGallery.routines.getCookie("gallery-"+setting.wrapperid) : 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
	if (setting.random == 0) {
	   setting.curimage = setting.curimage || 0	   
	}
	else {
	    setting.curimage = Math.floor(Math.random() * setting.imagearray.length)
	    setting.random = 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(){}
	setting.longestdesc="" //get longest description of all slides. If no desciptions defined, variable contains ""
	if (setting.shownavpanel == 1) {
	    for (var i = 0; i < setting.imagearray.length; i++) {
	        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 = $('#' + setting.wrapperid).css({ position: 'relative', visibility: 'visible', background: 'white', overflow: 'hidden', width: setting.dimensions[0], height: setting.dimensions[1] }).empty() //main gallery DIV
	    setting.$wrapperdiv.css("text-align", "center")
	    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
	    if (setting.shownavpanel == 1) {
	        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 = ''
	                    slideshow.setting[k][i] = null
	                }
	            }
	            if (slideshow.setting[k].innerHTML) //catch gallerydesctext div
	                slideshow.setting[k].innerHTML = ''
	            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.dimensions[0], setting.dimensions[1], setting.horizontalalign , setting.verticalalign)
        setting.$gallerylayers.eq(setting.bglayer).css({ zIndex: 1000, opacity: 0 }) //background layer becomes foreground
			.stop().css({ opacity: 0 }).animate({ opacity: 1 }, setting.fadeduration, function() { //Callback function after fade animation is complete:
			    clearTimeout(setting.playtimer)
			    setting.gallerylayers[setting.bglayer].innerHTML = ''  //empty bglayer (previously fglayer before setting.fglayer=setting.bglayer was set below)
			    try {
			        setting.onslide.call(slideshow, setting.gallerylayers[setting.fglayer], setting.curimage)
			    } catch (e) {
			        //alert("Simple Controls Gallery: An error has occured somwhere in your code attached to the \"onslide\" event: " + e)
			    }
			    setting.currentstep += 1
			    if (setting.autoplay[0]) {
			        if (setting.currentstep <= setting.totalsteps)
			            setting.playtimer = setTimeout(function() { slideshow.showslide('next') }, setting.autoplay[1])
			        else
			            slideshow.navigate("play/pause")
			    }
			}) //end callback function
        setting.gallerylayers[setting.fglayer].style.zIndex = 999 //foreground layer becomes background
        setting.fglayer = setting.bglayer
        setting.bglayer = (setting.bglayer == 0) ? 1 : 0
        setting.curimage = imgindex
        if (setting.shownavpanel == 1) {
            setting.navbuttons[3].innerHTML = (setting.curimage + 1) + '/' + setting.imagearray.length
            if (setting.imagearray[imgindex][3]) { //if this slide contains a description
                setting.$descpanel.css({ visibility: 'visible' })
                setting.descdiv.innerHTML = '<table width="100%" cellpadding="0" cellspacing="0" style="font:arial;"><tr><td>' + setting.imagearray[imgindex][3] + '</td></tr></table>'
            }
            else if (setting.longestdesc != "") { //if at least one slide contains a description (feature is enabled)
                setting.descdiv.innerHTML = '<div/>'
                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, width, height, horizontalalign, verticalalign) {
var setting = this.setting
var layerHTML = '<table width="' + width + '" cellpadding="0" cellspacing="0"><tr><td align="' + horizontalalign + '" valign="' + verticalalign + '" style="width:' + width + 'px;height:' + height + 'px;vertical-align:' + verticalalign + ';text-align:' + horizontalalign + ';">'
		layerHTML+=(imgelement[1])? '<a href="'+imgelement[1]+'" target="'+imgelement[2]+'" border="0">\n' : '' //hyperlink slide?
		layerHTML += '<img src="' + imgelement[0] + '"width="' + imgelement[4] + '" height="' + imgelement[5] + ' style="border-width:0;" border="0" />'
		layerHTML+=(imgelement[1])? '</a>' : ''
		layerHTML+='</td></tr></table>'
		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=/"
	}
}