using System;
using System.IO;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace Foresight.Engine.Scenes
{
    public class LoadingScene : Scene
    {
        protected const string ContentPath = "resmenu\\loading";
        private static readonly Vector2 LoadingBarPosition = new Vector2(284, 580);
        private static readonly Vector2 MapLoadingBarPosition = new Vector2(450, 675);

        // Textures
        private readonly Texture2D _barTexture;
        private readonly Texture2D _mainTexture;

        public bool Is3D() => false;

        private readonly Game _game;
        private readonly bool _isMap;

        private Vector2 BarPosition => _isMap ? MapLoadingBarPosition : LoadingBarPosition;

        private int _progress;
        private Rectangle _barBoundingRectangle;

        public LoadingScene(Game game, string mapName = null)
        {
            _game = game;
            _isMap = mapName != null;

            var loadingTextureLocation = Path.Combine(ContentPath, _isMap ? mapName : "NowLoading");
            _mainTexture = game.Content.Load<Texture2D>(loadingTextureLocation);

            var barTextureLocation = Path.Combine(ContentPath, _isMap ? "NowLoadingTextColor" : "ProgressBar");

            if (_isMap)
            {
                var origBarTexture = game.Content.Load<Texture2D>(barTextureLocation);

                // crop out the texture to only the text
                var newBarRect = new Rectangle(450, 0, 550, 64);
                _barTexture = new Texture2D(origBarTexture.GraphicsDevice, 550, 64);

                var data = new Color[550 * 64];
                origBarTexture.GetData(0, newBarRect, data, 0, 550 * 64);

                _barTexture.SetData(data);
            }
            else if (!_isMap)
            {
                _barTexture = game.Content.Load<Texture2D>(barTextureLocation);
            }

            Update(0);
        }

        public void Update(double percent)
        {
            if (percent > 1) percent = 1;
            if (percent < 0) percent = 0;

            var percentF = decimal.ToDouble(decimal.Round((decimal) percent, 2, MidpointRounding.AwayFromZero));
            var barWidth = (int)((_isMap ? 550 : _barTexture.Width) * percentF);

            _barBoundingRectangle = new Rectangle(0, 0, barWidth, _barTexture.Height);
        }

        public override void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(_mainTexture, Vector2.Zero, Color.White);
            spriteBatch.Draw(_barTexture, BarPosition, _barBoundingRectangle, Color.White);
        }

        public override void Dispose()
        {
            _barTexture?.Dispose();
            _mainTexture?.Dispose();
        }
    }
}