using System;
using System.Diagnostics;


namespace SpaceInvaders
{
    public class PlayAlienSounds : Command
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        private int sound;


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

        public PlayAlienSounds()
        {
            this.sound = 0;
        }


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

        public override void Execute(float deltaTime)
        {
            GameObject pGrid = ObjectNodeMan.FindObject(GameObject.ObjectName.AlienGrid);
           
            switch (sound)
            {
                case 0:
                    SoundManager.Play("fastinvader1.wav");
                    break;
                case 1:
                    SoundManager.Play("fastinvader2.wav");
                    break;
                case 2:
                    SoundManager.Play("fastinvader3.wav");
                    break;
                case 3:
                    SoundManager.Play("fastinvader4.wav");
                    break;
                default:
                    Debug.Assert(false);    //scream at me
                    break;
            }
            

            if(this.sound == 3)
            {
                this.sound = 0;
            }
            else
            {
                this.sound++;
            }


            if (ForwardIterator.GetChild(pGrid) != null)
            {
                float delta = ((State_Play)GameContext.GetCurrState()).GetCurrDelta();
                TimerEventMan.AddEvent(TimerEvent.EventName.PlayGridSound, this, delta);
            }            
        }


    } // end class

} // end namespace