//** 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:'32px', opacity:0.5, paddingTop:'5px', fontStyle:'bold 11px Verdana'}, //customize nav panel container
    images: [ '/images/gallery/left.gif', '/images/gallery/play.gif', '/images/gallery/right.gif', '/images/gallery/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(setting){
    this.setting=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=function() {
	return 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.showingAttribution = false;

    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];		
		if (setting.imagearray[i][4])
			setting.imagecaption=setting.imagearray[i][4];
    }
    var slideshow=this;
    
    var start = function($){
	var opts=slideshow.setting;
	opts.$wrapperdiv=$('#'+opts.wrapperid).css({position:'relative', visibility:'visible', background:'#fff', overflow:'hidden', width:opts.dimensions[0], height:opts.dimensions[1]}).empty(); //main gallery DIV
	if (opts.$wrapperdiv.length==0){ //if no wrapper DIV found
	    alert("Error: DIV with ID \""+opts.wrapperid+"\" not found on page.");
	    return;
	}
	opts.$gallerylayers=$('<div class="gallerylayer"></div><div class="gallerylayer"></div>') //two stacked DIVs to display the actual slide 
	    .css({position:'absolute', left:0, top:0})
	    .appendTo(opts.$wrapperdiv);
	opts.gallerylayers=opts.$gallerylayers.get(); //cache stacked DIVs as DOM objects
	opts.navbuttons=simpleGallery.routines.addnavpanel(opts); //get 4 nav buttons DIVs as DOM objects
	if (opts.longestdesc!="") //if at least one slide contains a description (feature is enabled)
	    opts.descdiv=simpleGallery.routines.adddescpanel(opts);
	if (opts.imagecaption!="")
		opts.captiondiv=simpleGallery.routines.addcaptionpanel(opts);
	$(opts.navbuttons).filter('img.navimages').css({opacity:0.8})
	    .bind('mouseover mouseout', function(e){
		      $(this).css({opacity:(e.type=="mouseover")? 1 : 0.8});
		  })
	    .bind('click', function(e){
		      var keyword=e.target.title.toLowerCase();
		      slideshow.navigate(keyword); //assign behavior to nav images
		  });
	opts.$wrapperdiv.bind('mouseenter', function(){slideshow.showhidenavpanel('show');});
	opts.$wrapperdiv.bind('mouseleave', function(){slideshow.showhidenavpanel('hide');});
	slideshow.showslide(opts.curimage); //show initial slide
	opts.oninit.call(slideshow); //trigger oninit() event
    };
    
    jQuery(document).ready(start);
}

simpleGallery.prototype={

    navigate:function(keyword){
	clearTimeout(this.setting.playtimer);
	this.currentstep = 0; // reset counter if navigation is used
	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.$gallerylayers.eq(setting.fglayer).stop().animate({opacity:0}, 300);
	var bgplayer = setting.$gallerylayers.eq(setting.bglayer).css({zIndex:1000, opacity:0}); //background layer becomes foreground
	var fadeIn = function() {
	    bgplayer.stop().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
	};
	setTimeout(fadeIn, 150); // delay fade in slightly
	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
	    if(setting.showingAttribution === false) {
		setting.descdiv.innerHTML= setting.imagearray[imgindex][3];
		setTimeout(function() {setting.$descpanel.animate({opacity:1}, setting.fadeduration);}, 150);
		setting.showingAttribution = true;
	    } else {
		setting.$descpanel.css({opacity:0});
		setTimeout(function() {setting.$descpanel.animate({opacity:1}, setting.fadeduration);}, 150);
		setting.descdiv.innerHTML= setting.imagearray[imgindex][3];
	    }
	} else { 
	    setting.$descpanel.animate({opacity:0}, 300, function() { setting.descdiv.innerHTML=null; });
	    setting.showingAttribution = false;
	}
	
	if (setting.imagearray[imgindex][4]) {
		setting.$captionpanel.css({ opacity: 0 });
		setting.captiondiv.innerHTML = setting.imagearray[imgindex][4];
		setTimeout(function() {setting.$captionpanel.animate({opacity:1}, setting.fadeduration);}, 150);
	} else {
		setting.captiondiv.innerHTML = null;
	}
    },

    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);
    }

};

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
	*/
    },

	addcaptionpanel: function(setting) {
		setting.$captionpanel = $('<div class="gallerycaption"></div>').appendTo(setting.$wrapperdiv.parent());
		return setting.$captionpanel.css({ opacity: 0 }).get(0);
	},

    adddescpanel:function(setting){
	setting.$descpanel=$('<div class="gallerydesc"><div class="gallerydesctext"></div></div>')
	    .appendTo(setting.$wrapperdiv.parent());
	return setting.$descpanel.css({opacity:0}).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=/";
    }
}