using System;
using System.Diagnostics;

namespace SpaceInvaders
{
    public class SpriteBoxMan : Manager
    {
        //-------------------------------------------------------------------
        //  FIELDS
        //-------------------------------------------------------------------

        private SpriteBox poCompare;
        private static SpriteBoxMan poInstance = null;


        //-------------------------------------------------------------------
        //  PRIVATE CONSTRUCTION
        //-------------------------------------------------------------------

        private SpriteBoxMan(int initialReserve = 3, int growReserve = 1) 
            : base(new DLinkMan(), new DLinkMan(), initialReserve, growReserve)
        {
            //LTN: owned by Sprite Box Man
            this.poCompare = new SpriteBox();
            Debug.Assert(this.poCompare != null);
        }


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

        public static void Create(int initialReserve = 3, int growReserve = 2)
        {
            //LTN: owned by Sprite Box Man
            //Debug.Assert(pInstance == null);
            if(SpriteBoxMan.poInstance == null)
            {
                SpriteBoxMan.poInstance = new SpriteBoxMan(initialReserve, growReserve);
                Debug.Assert(SpriteBoxMan.poInstance != null);
            }

            SpriteBox pSpriteBox = SpriteBoxMan.AddBox(SpriteBox.SpriteBoxName.NullObject, 0.0f, 0.0f, 0.0f, 0.0f);
            Debug.Assert(pSpriteBox != null);
        }

        public static void Destroy()
        {

        }

        public static SpriteBox AddBox(SpriteBox.SpriteBoxName name, float x, float y, float sx, float sy, Azul.Color pColor = null)
        {
            SpriteBoxMan pManager = SpriteBoxMan.GetInstance();
            Debug.Assert(pManager != null);

            SpriteBox pBox = (SpriteBox)pManager.AddToFront();
            Debug.Assert(pBox != null);

            pBox.SetBox(name, x, y, sx, sy, pColor);

            return pBox;
        }

        public static SpriteBox FindBox(SpriteBox.SpriteBoxName name)
        {
            SpriteBoxMan pManager = SpriteBoxMan.GetInstance();
            Debug.Assert(pManager != null);

            pManager.poCompare.name = name;
            SpriteBox pBox = (SpriteBox)pManager.Find(pManager.poCompare);

            return pBox;
        }

        public static void RemoveBox(SpriteBox pBox)
        {
            Debug.Assert(pBox != null);

            SpriteBoxMan pManager = SpriteBoxMan.GetInstance();
            Debug.Assert(pManager != null);

            pManager.Remove(pBox);
        }

        public static void PrintBox()
        {
            SpriteBoxMan pManager = SpriteBoxMan.GetInstance();
            Debug.Assert(pManager != null);

            pManager.PrintStats();
        }


        //-------------------------------------------------------------------
        //  PROTECTED METHODS
        //-------------------------------------------------------------------

        protected override Node derivedCreate()
        {
            //LTN: owned by Sprite Node Man
            Node pNode = new SpriteBox();
            Debug.Assert(pNode != null);

            return pNode;
        }


        //-------------------------------------------------------------------
        //  PRIVATE METHODS
        //-------------------------------------------------------------------

        private static SpriteBoxMan GetInstance()
        {
            Debug.Assert(SpriteBoxMan.poInstance != null);
            return SpriteBoxMan.poInstance;
        }


    } //end class

} //end namespace