using System;
using System.IO;
using System.Linq;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Processing.Drawing;

namespace porter_duff_tests
{
    class Program
    {
        private static PixelBlenderMode[] CompositingOperators =
        {
            PixelBlenderMode.Src,
            PixelBlenderMode.Atop,
            PixelBlenderMode.Over,
            PixelBlenderMode.In,
            PixelBlenderMode.Out,
            PixelBlenderMode.Dest,
            PixelBlenderMode.DestAtop,
            PixelBlenderMode.DestOver,
            PixelBlenderMode.DestIn,
            PixelBlenderMode.DestOut,
            PixelBlenderMode.Clear,
            PixelBlenderMode.Xor
        };

        private static PixelBlenderMode[] SeparableBlendedModes =
        {
            PixelBlenderMode.Normal,
            PixelBlenderMode.Multiply,
            PixelBlenderMode.Add,
            PixelBlenderMode.Substract,
            PixelBlenderMode.Screen,
            PixelBlenderMode.Darken,
            PixelBlenderMode.Lighten,
            PixelBlenderMode.Overlay,
            PixelBlenderMode.HardLight
        };

        static void Main(string[] args)
        {
            Directory.CreateDirectory(FixPath("output"));
            Directory.CreateDirectory(FixPath("output/compositing/src-dest"));
            Directory.CreateDirectory(FixPath("output/compositing/dest-src"));
            Directory.CreateDirectory(FixPath("output/separable"));

            using (var src = Image.Load(FixPath("source.png")))
            using (var dest = Image.Load(FixPath("dest.png")))
            {
                foreach (var m in CompositingOperators)
                {
                    using (var res = dest.Clone(x => x.Blend(src, new GraphicsOptions() { BlenderMode = m })))
                    {
                        res.Save(FixPath($"output/compositing/src-dest/{m}.png"));
                    }
                    using (var res = src.Clone(x => x.Blend(dest, new GraphicsOptions() { BlenderMode = m })))
                    {
                        res.Save(FixPath($"output/compositing/dest-src/{m}.png"));
                    }
                }
            }

            using (var src = Image.Load(FixPath("ducky.png")))
            using (var dest = Image.Load(FixPath("background.png")))
            {
                foreach (var m in SeparableBlendedModes)
                {
                    using (var res = dest.Clone(x => x.Blend(src, new GraphicsOptions() { BlenderMode = m })))
                    {
                        res.Save(FixPath($"output/separable/{m}.png"));
                    }
                }
            }
        }


        private static string FixPath(string s)
        {
            return $"../../../{s}";
        }
    }
}