using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RhythmBullet.Zer01HD.Utilities.UI
{
    public enum ScreenState { EnterTransition, ExitTransition, Normal }

    public class Screen
    {
        public bool UseRenderTargetForExitTransition;
        private GraphicsDevice GraphicsDevice;
        public Screen(bool useEnterTransition = false)
        {
            State = useEnterTransition ? ScreenState.EnterTransition : ScreenState.Normal;
        }

        public void Initiate(Rectangle screenSize, GraphicsDevice graphicsDevice)
        {
            Initiated = true;
            this.ScreenSize = screenSize;
            this.GraphicsDevice = graphicsDevice;
            RenderTarget = new RenderTarget2D(graphicsDevice, ScreenSize.Width, ScreenSize.Height);
        }

        public virtual void Update(GameTime gameTime)
        {

        }

        public virtual void Draw(SpriteBatch spriteBatch)
        {

        }

        public virtual void EnteringTransition(double delta, bool assetsLoaded, ref Color backgroundColor, RenderTarget2D previousScreenExitFrame)
        {

        }

        public virtual bool ExitingTransition(double delta, bool assetsLoaded, ref Color backgroundColor)
        {
            return true;
        }

        public virtual void Show()
        {

        }

        public virtual void Hide()
        {

        }

        public virtual void AssetLoadStateChange(bool state)
        {

        }

        public ScreenState State { get; private set; }

        public void DoneEnterTransition()
        {
            State = ScreenState.Normal;
        }

        public void StartExitTransition(bool UseRenderTargetForExitTransition = false)
        {
            this.UseRenderTargetForExitTransition = UseRenderTargetForExitTransition;
            State = ScreenState.ExitTransition;
        }

        public Screen NextScreen
        {
            get; protected set;
        }

        public Rectangle ScreenSize
        {
            get;
            protected set;
            //Remember to init in init func
        }

        public RenderTarget2D RenderTarget
        {
            get;
            private set;
        }

        public bool Initiated
        {
            get;
            private set;
        }
    }
}