package ca.esdot.lib.display
{
	import avmplus.getQualifiedClassName;

	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import flash.utils.Dictionary;

	public class BlitClip extends Bitmap
	{
		protected static var frameCacheByAsset:Object = {};
		protected var _currentStartFrame:int = 1;
		protected var _currentEndFrame:int = 20;
		protected var _currentFrame:int = 1;
		protected var frameCache:Object;

		public function BlitClip(bitmapAsset:Class, jsonAsset:Class){

			//Check cache, if we have a cache us it.
			if(frameCacheByAsset[getQualifiedClassName(bitmapAsset)])
			{
				frameCache = frameCacheByAsset[getQualifiedClassName(bitmapAsset)];
			}
			//If not cached, rip frames from bitmapData and grab json
			else {

				var data:Object = JSON.parse(new jsonAsset().toString());
				var bitmap:Bitmap = new bitmapAsset();
				var spriteSheet:BitmapData = bitmap.bitmapData;

				//todo: use JSON
				var frameWidth:int = 186;
				var frameHeight:int = 176;
				var cols:int = spriteSheet.width/frameWidth|0;
				var rows:int = spriteSheet.height/frameHeight|0;

				frameCache = [];

				for(var i:int = 0; i < 20; i++){
					var col:int = i%cols;
					var row:int = i/cols|0;
					var bmpData:BitmapData = new BitmapData(frameWidth, frameHeight, true, 0x0);
					bmpData.copyPixels(spriteSheet,  new Rectangle(frameWidth*col, frameHeight*row, frameWidth, frameHeight), new Point());
					frameCache[i] = bmpData;
				}
				//add data to static cache
				frameCacheByAsset[getQualifiedClassName(bitmapAsset)] = frameCache;
			}
			//Show frame 1
			this.bitmapData = frameCache[_currentStartFrame-1];
		}

		override public function set bitmapData(value:BitmapData):void {
			super.bitmapData = value;
			smoothing = true;
		}

		public function tick():void {
			if(_currentFrame > _currentEndFrame){
				_currentFrame = _currentStartFrame;
			}
			currentFrame = _currentFrame;
			_currentFrame++;
		}

		public function set currentFrame(value:int):void {
			_currentFrame = Math.max(0, Math.min(frameCache.length, value));
			this.bitmapData = frameCache[_currentFrame-1];
		}
	}
}