using System;
using System.Diagnostics;


namespace SpaceInvaders
{
    public class RemoveMissileObserver : CollisionObserver
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        private GameObject pMissile;


        //-------------------------------------------------------------------
        //  CONSTRUCTION
        //-------------------------------------------------------------------

        public RemoveMissileObserver() : base()
        {
            this.pMissile = null;
        }

        public RemoveMissileObserver(RemoveMissileObserver m) : base()
        {
            Debug.Assert(m.pMissile != null);
            this.pMissile = m.pMissile;
        }


        //-------------------------------------------------------------------
        //  PUBLIC METHODS
        //-------------------------------------------------------------------

        public override void Notify()
        {
            //get missile
            if(this.pSubject.pObjA.GetType() == typeof(Missile))
            {
                this.pMissile = (Missile)this.pSubject.pObjA;
            }
            else
            {
                this.pMissile = (Missile)this.pSubject.pObjB;
            }
            
            //set as dead & remove
            if(pMissile.isDead == false)
            {
                pMissile.isDead = true;

                RemoveMissileObserver pObserver = new RemoveMissileObserver(this);
                DelayObjectMan.AttachDelay(pObserver);
            }
        }

        public override void Execute()
        {
            //game object deletes it
            this.pMissile.Remove();
        }


    } // end class

} // end namespace