// Flash debugging widget
// Copyright 2007 Amit J Patel, amitp@cs.stanford.edu
// License: MIT (see LICENSE file)

package {
    // Used for debugging output
    
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.text.TextFormat;
    
    public class Debug extends Sprite {
        
        private var txt:TextField;
        private static var singleton:Debug;
        
        public function Debug(parent:Sprite) {
            // There can be only one!!
            if (singleton) {
                // TODO: how to throw an error?
            }
            singleton = this;

            cacheAsBitmap = true;
            txt = new TextField();
            txt.selectable = false;
            txt.height = 500; // TODO: parent.height;
            txt.width = 500; // TODO: parent.width;
            var format:TextFormat = txt.getTextFormat();
            format.color = 0x666666;
            format.font = "_typewriter";
            format.size = 9;
            txt.defaultTextFormat = format;
            addChild(txt);
        }
        
        public static function trace(...args):void {
            singleton.txt.appendText("\n" + args.join(" "));
            if (singleton.txt.text.length > 10000) {
                singleton.txt.text = singleton.txt.text.slice(-10000);
            }
            singleton.txt.scrollV = singleton.txt.maxScrollV;
        }
    }
}