// Copyright (c) Six Labors and contributors.
// Licensed under the Apache License, Version 2.0.

using System.IO;

using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.Metadata;
using SixLabors.ImageSharp.PixelFormats;

namespace SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs
{
    public class SystemDrawingReferenceDecoder : IImageDecoder, IImageInfoDetector
    {
        public static SystemDrawingReferenceDecoder Instance { get; } = new SystemDrawingReferenceDecoder();

        public Image<TPixel> Decode<TPixel>(Configuration configuration, Stream stream)
            where TPixel : struct, IPixel<TPixel>
        {
            using var sourceBitmap = new System.Drawing.Bitmap(stream);
            if (sourceBitmap.PixelFormat == System.Drawing.Imaging.PixelFormat.Format32bppArgb)
            {
                return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(sourceBitmap);
            }

            using var convertedBitmap = new System.Drawing.Bitmap(
                sourceBitmap.Width,
                sourceBitmap.Height,
                System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            using var g = System.Drawing.Graphics.FromImage(convertedBitmap);
            g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;

            g.DrawImage(sourceBitmap, 0, 0, sourceBitmap.Width, sourceBitmap.Height);

            return SystemDrawingBridge.From32bppArgbSystemDrawingBitmap<TPixel>(convertedBitmap);
        }

        public IImageInfo Identify(Configuration configuration, Stream stream)
        {
            using var sourceBitmap = new System.Drawing.Bitmap(stream);
            var pixelType = new PixelTypeInfo(System.Drawing.Image.GetPixelFormatSize(sourceBitmap.PixelFormat));
            return new ImageInfo(pixelType, sourceBitmap.Width, sourceBitmap.Height, new ImageMetadata());
        }

        public Image Decode(Configuration configuration, Stream stream) => this.Decode<Rgba32>(configuration, stream);
    }
}