using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using static UnityStudio.Studio;

namespace UnityStudio
{
    static class SpriteHelper
    {
        private static Dictionary<AssetPreloadData, Bitmap> spriteCache = new Dictionary<AssetPreloadData, Bitmap>();

        public static Bitmap GetImageFromSprite(AssetPreloadData asset)
        {
            if (spriteCache.TryGetValue(asset, out var bitmap))
                return (Bitmap)bitmap.Clone();
            var m_Sprite = new Sprite(asset, true);
            if (assetsfileList.TryGetPD(m_Sprite.m_SpriteAtlas, out var assetPreloadData))
            {
                var m_SpriteAtlas = new SpriteAtlas(assetPreloadData);
                var index = m_SpriteAtlas.guids.FindIndex(x => x == m_Sprite.first);
                if (index >= 0 && assetsfileList.TryGetPD(m_SpriteAtlas.textures[index], out assetPreloadData))
                {
                    return CutImage(asset, assetPreloadData, m_SpriteAtlas.textureRects[index], m_Sprite);
                }
            }
            else
            {
                if (assetsfileList.TryGetPD(m_Sprite.texture, out assetPreloadData))
                {
                    return CutImage(asset, assetPreloadData, m_Sprite.textureRect);
                }
            }

            return null;
        }

        private static Bitmap CutImage(AssetPreloadData asset, AssetPreloadData texture2DAsset, RectangleF textureRect)
        {
            var texture2D = new Texture2D(texture2DAsset, true);
            using (var originalImage = texture2D.ConvertToBitmap(false))
            {
                if (originalImage != null)
                {
                    var info = texture2DAsset.InfoText;
                    var start = info.IndexOf("Format");
                    info = info.Substring(start, info.Length - start);
                    asset.InfoText = $"Width: {textureRect.Width}\nHeight: {textureRect.Height}\n" + info;
                    var spriteImage = originalImage.Clone(textureRect, PixelFormat.Format32bppArgb);
                    spriteImage.RotateFlip(RotateFlipType.RotateNoneFlipY);
                    spriteCache.Add(asset, spriteImage);
                    return (Bitmap)spriteImage.Clone();
                }
            }

            return null;
        }

        private static Bitmap CutImage(AssetPreloadData asset, AssetPreloadData texture2DAsset, RectangleF textureRect, Sprite sprite)
        {
            var texture2D = new Texture2D(texture2DAsset, true);
            using (var originalImage = texture2D.ConvertToBitmap(false))
            {
                if (originalImage != null)
                {
                    var info = texture2DAsset.InfoText;
                    var start = info.IndexOf("Format");
                    info = info.Substring(start, info.Length - start);
                    asset.InfoText = $"Width: {textureRect.Width}\nHeight: {textureRect.Height}\n" + info;
                    var spriteImage = originalImage.Clone(textureRect, PixelFormat.Format32bppArgb);
                    using (var brush = new TextureBrush(spriteImage))
                    {
                        using (var path = new GraphicsPath())
                        {
                            foreach (var p in sprite.m_PhysicsShape)
                                path.AddPolygon(p);
                            using (var matr = new Matrix())
                            {
                                matr.Translate(sprite.m_Rect.Width * sprite.m_Pivot.X, sprite.m_Rect.Height * sprite.m_Pivot.Y);
                                matr.Scale(sprite.m_PixelsToUnits, sprite.m_PixelsToUnits);
                                path.Transform(matr);
                                var bitmap = new Bitmap((int)textureRect.Width, (int)textureRect.Height);
                                using (var graphic = Graphics.FromImage(bitmap))
                                {
                                    graphic.FillPath(brush, path);
                                    bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
                                    spriteCache.Add(asset, bitmap);
                                    return (Bitmap)bitmap.Clone();
                                }
                            }
                        }
                    }
                }
            }

            return null;
        }
    }
}