//** DD Drop Down Panel- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Dec 7th, 08'- Script created (Requires jquery 1.2.x)

var simpleGallery_navpanel = {
	panel: { height: '0px', opacity: 0.5, paddingTop: '5px', fontStyle: 'bold 11px Verdana' }, //customize nav panel container
	images: ['left.gif', 'play.gif', 'right.gif', '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.pause = parseInt(setting.pause)
	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 //ispaused reflects current state of gallery, autoplay indicates whether gallery is set to auto play
	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 = [] //temp array to preload images
	for (var i = 0; i < setting.imagearray.length; i++) {
		preloadimages[i] = new Image()
		preloadimages[i].src = setting.imagearray[i][0]
	}
	var slideshow = this
	jQuery(document).ready(function($) {
		var setting = slideshow.setting
		setting.$wrapperdiv = $('#' + setting.wrapperid).css({ position: 'absolute', visibility: 'visible', background: 'white', overflow: 'hidden', width: setting.dimensions[0], height: setting.dimensions[1] }).empty() //main gallery DIV
		if (setting.$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
		$(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() //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")
							slideshow.setting[k][i].innerHTML = null
						slideshow.setting[k][i] = null
					}
				}
				slideshow.setting[k] = null
			})
			slideshow = slideshow.setting = null
		})
	})
}

simpleGallery.prototype = {

	navigate: function(keyword) {
		clearTimeout(this.setting.playtimer)
		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 = false
				$playbutton.attr({ title: 'Play', src: simpleGallery_navpanel.images[1] })
			}
			else if (this.setting.ispaused) { //if play Gallery
				this.setting.autoplay = true
				this.setting.playtimer = setTimeout(function() { slideshow.showslide('next') }, this.setting.pause)
				$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: 3, 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(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)
				}
				if (setting.autoplay) {
					setting.playtimer = setTimeout(function() { slideshow.showslide('next') }, setting.pause)
				}
			})
		setting.gallerylayers[setting.fglayer].style.zIndex = 2 //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
	},

	showhidenavpanel: function(state) {
		var setting = this.setting
		var endpoint = (state == "show") ? setting.dimensions[1] - parseInt(simpleGallery_navpanel.panel.height) : this.setting.dimensions[1]
		setting.$navpanel.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 = $('<div class="navpanellayer"></div>')
			.css({ position: 'absolute', width: '100%', height: simpleGallery_navpanel.panel.height, left: 0, top: setting.dimensions[1], font: simpleGallery_navpanel.panel.fontStyle, zIndex: '1001' })
			.appendTo(setting.$wrapperdiv)
		$('<div class="navpanellayerbg"></div><div class="navpanellayerfg"></div>')
			.css({ position: 'absolute', left: 0, top: 0, width: '100%', height: '100%' })
			.eq(0).css({ background: 'black', opacity: simpleGallery_navpanel.panel.opacity }) //"navpanellayerbg" div
			.end().eq(1).css({ paddingTop: simpleGallery_navpanel.panel.paddingTop, textAlign: 'center', color: 'white' }).html(interfaceHTML) //"navpanellayerfg" div
			.end().appendTo(setting.$navpanel)
		return setting.$navpanel.find('img.navimages, div.gallerystatus').get() ////return 4 nav buttons DIVs as DOM objects
	},

	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=/"
	}
}