/*--------------------------------------------------------
 *  BEGIN FeatureViewer class
 *-------------------------------------------------------*/
 
var FeatureViewer = Class.create();
FeatureViewer.prototype.extend({

	initialize: function() {

		//get and cache dom references
		this.containerNode = document.getElementById("FVContainer");
		this.contentNode = document.getElementById("FVContent");
		this.navNode = document.getElementById("FVNav");
		//this.readBtn = document.getElementById("FVReadBtn");
		this.arrNavs = this.navNode.getElementsByTagName("a");
		
		//build shadow node
		this.shadowNode = this.contentNode.cloneNode(1);
		this.shadowNode.id = "FVContentShadow";
		this.containerNode.appendChild(this.shadowNode);

		this.arrContent = this.contentNode.childNodes;
		this.arrContentShadow = this.shadowNode.childNodes;

		//set input arrays
		//this.arrImages = new Array();
		this.arrLinks = new Array();
		
		//cache these values so we don't have to calculate later
		this.contentLength = 0;
		this.selectedItem = 0;

		//set timer durations		
		this.rotateDuration = 10000;
		this.idleDuration = 10000;
		this.navCloseDuration = 10000;
		
	},
	
	start: function() {

		this.contentLength = this.arrLinks.length;

		//preload images
		//for (var i=0;i<this.contentLength;i++) {
			//this.preload(this.arrImages[i]);
		//}
		
		this.swapItem(1);
		this.startIdle();

	},
	
	swapItem: function(item) {
	
	 	if (!item) {
	 		//this is an automated swap
	 		if (this.selectedItem == this.contentLength) {
	 			item = 1;
	 		} else {
	 			item = this.selectedItem+1;
	 		}
	 	} else {
	 		this.stopAllTimers();
	 	}
	 	
	 	this.selectedItem = item;
	 	var index = item-1;

	 	
	 	this.renderContent(index);
	 	this.highlightNav(index);
	 	
	},
	
	stopAllTimers: function() {
		this.stopDelayedNavClose();
		this.stopIdle();
		this.stopRotation();
	},
	
	startIdle: function() {
		this.stopDelayedNavClose();
		this.stopIdle();
		this.stopRotation();
		this.idleInterval = setInterval("fv.startRotation()",this.idleDuration);
	},
	
	stopIdle: function() {
		clearInterval(this.idleInterval);
	},
	
	startRotation: function() {
		this.stopIdle();
		this.startDelayedNavClose();
		this.rotateInterval = setInterval("fv.swapItem()",this.rotateDuration);
	},
	
	stopRotation: function() {
		clearInterval(this.rotateInterval);
	},
	
	startDelayedNavClose: function () {
		this.stopDelayedNavClose();
		this.navCloseInterval = setInterval("fv.closeNav()",this.navCloseDuration);
	},
	
	stopDelayedNavClose: function() {
		clearInterval(this.navCloseInterval);
	},

	openNav: function() {
		fv.navNode.style.width = "188px";

		//clear existing event if it exists
		if ( fv.navNode.detachEvent ) {
			fv.navNode.detachEvent( "onmouseover", fv.openNav );
		} else {
			fv.navNode.removeEventListener( "mouseover", fv.openNav, false );
		}

		//set an event to close nav onmouseout
		if ( fv.navNode.attachEvent ) {
			fv.navNode.attachEvent( "onmouseout", fv.closeNav );
		} else {
			fv.navNode.addEventListener( "mouseout", fv.closeNav, false );
		}

		//addEvent(fooNode,"mouseout",fv.closeNav);
		//fv.startDelayedNavClose();
	},

	closeNav: function() {

		fv.stopDelayedNavClose();
		fv.navNode.style.width = "33px";

		//clear existing event
		if ( fv.navNode.detachEvent ) {
			fv.navNode.detachEvent( "onmouseout", fv.closeNav );
		} else {
			fv.navNode.removeEventListener( "mouseout", fv.closeNav, false );
		}

		//set an event to open nav onmouseover
		if ( fv.navNode.attachEvent ) {
			fv.navNode.attachEvent( "onmouseover", fv.openNav );
		} else {
			fv.navNode.addEventListener( "mouseover", fv.openNav, false );
		}

		//this.resizeNav(160,18,10);
	},
	
	resizeNav: function(start,end,interval) {
		this.navNode.style.width = start + "px";
		var newStart = start - 20;
		if (newStart > end) {
			setTimeout("fv.resizeNav("+newStart+","+end+")",interval);
		}
	},
	
	contentLink: function() {
		document.location.href = fv.arrLinks[fv.selectedItem-1];
	},

	renderContent: function(index) {
		
		//clear content
	 	for (var i=0;i<this.contentLength;i++) {
	 		this.arrContent[i].style.display = "none";
	 		this.arrContentShadow[i].style.display = "none";
	 	}

		//show content
	 	this.arrContent[index].style.display = "block";
	 	this.arrContentShadow[index].style.display = "block";
	 	//this.containerNode.style.backgroundImage = "url("+this.arrImages[index]+")";

	 	//to be safe, remove old link event
		if ( fv.contentNode.detachEvent ) {
			fv.contentNode.detachEvent( "onclick", fv.contentLink );
		} else {
			fv.contentNode.removeEventListener( "click", fv.contentLink, false );
		}

	 	//add content hotspot
		if ( fv.contentNode.attachEvent ) {
			fv.contentNode.attachEvent( "onclick", fv.contentLink );
		} else {
			fv.contentNode.addEventListener( "click", fv.contentLink, false );
		}

	 	//this.readBtn.setAttribute("href",this.arrLinks[index]);

	},
	
	highlightNav: function(index) {
	 	for (var i=0;i<this.arrContent.length;i++) {
	 		//this.arrNavs[i].className = "";
			hilite('fbut'+(i+1),'fbut'+(i+1));
	 	}
	 	//this.arrNavs[index].className = "FVNavOn";
		hilite('fbut'+(index+1),'fbut'+(index+1)+'on');
	},
	
	preload: function(url) {
		var img = new Image;
		img.src = url;
		//this.arrImages.push(url);
	}

});

/*--------------------------------------------------------
 *  END FeatureViewer class
 *-------------------------------------------------------*/