using System;
using System.Diagnostics;


namespace SpaceInvaders
{
    public class ToggleObserver : InputObserver
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        SpriteBatch pBatch;


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

        public ToggleObserver() : base()
        {
            this.pBatch = SpriteBatchMan.FindBatch(SpriteBatch.BatchName.Boxes);
            Debug.Assert(this.pBatch != null);
        }

        public ToggleObserver(SpriteBatch batch) : base()
        {
            Debug.Assert(batch != null);
            this.pBatch = batch;
        }


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

        public override void Notify()
        {
            if(pBatch.GetToggle() == true)
            {
                pBatch.SetToggle(false);
            }
            else
            {
                pBatch.SetToggle(true);
            }
        }


    } // end class

} // end namespace