package 
{

	import fl.transitions.Tween;
	import fl.transitions.easing.Strong;
	import fl.transitions.TweenEvent;
	
	import flash.display.Sprite;
	import flash.net.URLLoader;
	import flash.net.URLRequest;
	import flash.display.Loader;
	import flash.text.TextField;
	import flash.text.TextFormat;
	import flash.text.TextFieldAutoSize;
	import flash.text.AntiAliasType;
	import flash.utils.Timer;
	import flash.events.TimerEvent;
	import flash.events.Event;
	import flash.events.MouseEvent;

	public class imageGallery extends Sprite {
		
		private var xml:XML;
		private var urlLoader:URLLoader;
		private var imagesVector:Vector.<Loader> = new Vector.<Loader>();
		private var imagesCounter:int = 0;
		private var tween:Tween;
		private var lastTarget:*;
		private var tweening = false;
		private var infoCounter:int = 0;
		private var infoPanel:Sprite = new Sprite();
		private var titleField:TextField = new TextField();
		private var description:TextField = new TextField();
		private var titleFormat:TextFormat = new TextFormat();
		private var descriptionTF:TextFormat = new TextFormat();
		private var timer:Timer;
		private var preloader:Preloader = new Preloader();
		private var added:Boolean;

		private var titleFont:Helvetica = new Helvetica();
		private var bitmapFont:Harmony = new Harmony();
		
		public function imageGallery(xmlPath:String = "images.xml", interval:int = 2000):void {
			timer = new Timer(interval);
			
			titleFormat.bold = true;
			titleFormat.font = titleFont.fontName;
			titleFormat.color = 0xFFFFFF;
			titleFormat.size = 14;

			descriptionTF.font = bitmapFont.fontName;
			descriptionTF.color = 0xEEEEEE;
			descriptionTF.size = 8;

			titleField.defaultTextFormat = titleFormat;
			titleField.autoSize = TextFieldAutoSize.LEFT;
			titleField.embedFonts = true;
			titleField.antiAliasType = AntiAliasType.ADVANCED;

			description.defaultTextFormat = descriptionTF;
			description.autoSize = TextFieldAutoSize.LEFT;
			description.embedFonts = true;
			
			loadXML(xmlPath);
		}
		
		private function loadXML(file:String):void {
			urlLoader = new URLLoader(new URLRequest(file));
			urlLoader.addEventListener(Event.COMPLETE, parseXML);
		}

		private function parseXML(e:Event):void {
			xml = new XML(e.target.data);

			loadImages();
		}

		private function loadImages():void
		{
			for (var i:int = 0; i < xml.children().length(); i++)
			{
				var loader:Loader = new Loader();

				loader.load(new URLRequest(xml.children()[i].@src));

				imagesVector.push(loader);

				loader.contentLoaderInfo.addEventListener(Event.COMPLETE, sortImages);
			}
		}

		private function sortImages(e:Event):void
		{
			imagesCounter++;

			for (var i:int = 0; i < imagesVector.length; i++)
			{
				imagesVector.reverse();

				addChild(imagesVector[i]);
			}

			if (imagesCounter == imagesVector.length)
			{
				createInfoPanel();
				timer.addEventListener(TimerEvent.TIMER, autoChange);
				timer.start();
				addPreloader();
				addActions();
			}
		}

		private function addActions():void
		{
			for (var i:int = 0; i < imagesVector.length; i++)
			{
				imagesVector[i].addEventListener(MouseEvent.MOUSE_UP, changeImage);
			}
		}

		private function changeImage(e:MouseEvent):void
		{
			timer.stop();
			
			if(added)
			{
				removeChild(preloader);
				added = false;
			}

			if (! tweening)
			{
				lastTarget = e.target;
				tween = new Tween(e.target,"alpha",Strong.easeOut,1,0,1,true);
				tween.addEventListener(TweenEvent.MOTION_FINISH, changeDepth);
				tweening = true;

				infoCounter++;

				if (infoCounter >= xml.children().length())
				{
					infoCounter = 0;
					titleField.text = xml.children()[infoCounter]. @ title;
					description.text = xml.children()[infoCounter]. @ description;
				}
				else
				{
					titleField.text = xml.children()[infoCounter]. @ title;
					description.text = xml.children()[infoCounter]. @ description;
				}
			}
		}

		private function changeDepth(e:TweenEvent):void
		{
			setChildIndex(lastTarget, 0);
			lastTarget.alpha = 1;
			tweening = false;
		}

		private function createInfoPanel():void
		{
			infoPanel.graphics.beginFill(0x000000, 0.5);
			infoPanel.graphics.drawRect(0, 0, 600, 50);
			infoPanel.graphics.endFill();

			titleField.text = xml.children()[infoCounter]. @ title;
			titleField.x = 5;
			titleField.y = 5;

			description.text = xml.children()[infoCounter]. @ description;
			description.x = 7;
			description.y = 22;

			infoPanel.y = 250;

			infoPanel.addChild(titleField);
			infoPanel.addChild(description);

			addChild(infoPanel);
		}

		private function autoChange(e:TimerEvent):void
		{
			infoCounter++;

			lastTarget = imagesVector[xml.children().length() - infoCounter];
			tween = new Tween(imagesVector[xml.children().length() - infoCounter],"alpha",Strong.easeOut,1,0,1,true);
			tween.addEventListener(TweenEvent.MOTION_FINISH, changeDepth);
			tweening = true;

			if (infoCounter >= xml.children().length())
			{
				infoCounter = 0;
				titleField.text = xml.children()[infoCounter]. @ title;
				description.text = xml.children()[infoCounter]. @ description;
			}
			else
			{
				titleField.text = xml.children()[infoCounter]. @ title;
				description.text = xml.children()[infoCounter]. @ description;
			}
		}

		private function addPreloader():void
		{
			added = true;
			
			preloader.scaleX = 0.08;
			preloader.scaleY = 0.08;
		
			preloader.x = (600 - preloader.width/2) - 12;
			preloader.y = (300 - preloader.height/2) - 12;
		
			addChild(preloader);
		}
	}
}