package iceteroids
{
    import flash.display.DisplayObject;
    import flash.geom.Point;
    import flash.media.Sound;
    import flash.media.SoundChannel;



    public class BulletManager
    {
        private var allBullets:Array = new Array();
        private var activeBullets:Array = new Array();
        private var pooledBullets:Array = new Array();
        public function get ActiveBullets():Array { return activeBullets; }

        private var game:Game;
        private var speed:Number;
        private var lifespan:int;

        private var laserSound:Sound;
        private var laserChannel:SoundChannel;

        public function BulletManager(aGame:Game, aSize:int = 20, aSpeed:Number = 15, aLifetime:int = 60)
        {
            game = aGame;
            speed = aSpeed;
            lifespan = aLifetime;

            for ( var i:int = 0; i < aSize; i++ )
            {
                allBullets.push(new Bullet(game));
            }

            pooledBullets = allBullets.concat();

            laserSound = new LaserSound();
        }

        public function fireBullet(aPos:Point, aRot:Number, ivx:Number, ivy:Number):Boolean
        {
            // make sure we have bullets available in our pool
            if(pooledBullets.length > 0)
            {
                // if so, pop one off the end of the pool
                var b:Bullet = pooledBullets.pop();

                // calculate its movement values
                // which are compounded onto the passed in movement values
                var rotAsRad:Number = aRot*Math.PI/180;
                ivx += Math.cos(rotAsRad)*speed;
                ivy += Math.sin(rotAsRad)*speed;

                // tell the bullet to fire
                b.fire(aPos, aRot, ivx, ivy);

                // add the bullet to activeBullets, and the display list
                activeBullets.push(b);
                game.bLayer.addChild(b);


                laserChannel = laserSound.play();

                // we fired a bullet, so return true!
                return true;
            }
            // no bullets available, return false!
            return false;
        }

        public function update():void
        {
            // a temporary bullet holding var
            var b:Bullet;

            // iterate over activeBullets
            for (var i:int = 0; i < activeBullets.length; i++)
            {
                // cast activeBullets[i] as a Bullet and save it in b
                b = (activeBullets[i] as Bullet);

                // move the bullet
                b.move();

                // make the bullet older
                b.age++;

                // if the bullet is too old
                if(b.age > lifespan)
                {
                    // remove it from activeBullets
                    activeBullets.splice(i,1);
                    // add it to pooledBullets
                    pooledBullets.push(b);
                    // remove it from the display list
                    game.bLayer.removeChild(b);
                    // decrement i (so we don't skip the bullet that was next)
                    i--;
                }
            }
        }

        public function killBullet(b:Bullet, index:int):void
        {
            activeBullets.splice(index,1);
            pooledBullets.push(b);
            game.bLayer.removeChild(b);
        }
    }
}