using o0.Geometry;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.UI;

namespace o0.Project
{
    public enum ColorChannel
    {
        Red,
        Green,
        Blue,
    }
    public static partial class Extension
    {
        static public Matrix Too0Mat(this WebCamTexture Tex, ColorChannel channel = ColorChannel.Red)
        {
            Matrix mat = new Matrix(new Geometry2D.Vector<int>(Tex.width, Tex.height));
            var length = Tex.width * Tex.height;
            UnityEngine.Color[] pixel = Tex.GetPixels();
            switch (channel)
            {
                default:
                case ColorChannel.Red:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].r);
                    break;
                case ColorChannel.Green:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].g);
                    break;
                case ColorChannel.Blue:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].b);
                    break;
            }
            return mat;
        }
        static public Matrix Too0Mat(this Texture2D Tex, ColorChannel channel = ColorChannel.Red)
        {
            Matrix mat = new Matrix(new Geometry2D.Vector<int>(Tex.width, Tex.height));
            var length = Tex.width * Tex.height;
            UnityEngine.Color[] pixel = Tex.GetPixels();
            switch (channel)
            {
                default:
                case ColorChannel.Red:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].r);
                    break;
                case ColorChannel.Green:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].g);
                    break;
                case ColorChannel.Blue:
                    Parallel.For(0, length, i => mat.Element[i] = pixel[i].b);
                    break;
            }
            return mat;
        }
        static public Texture2D ToTex(this Matrix mat, ColorChannel channel = ColorChannel.Red)
        {
            var length = mat.Size.x * mat.Size.y;
            var ele = mat.Element;
            UnityEngine.Color[] pixel = new UnityEngine.Color[length];
            switch (channel)
            {
                default:
                case ColorChannel.Red:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(ele[i], 0, 0));
                    break;
                case ColorChannel.Green:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(0, ele[i], 0));
                    break;
                case ColorChannel.Blue:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(0, 0, ele[i]));
                    break;
            }
            var tex = new Texture2D(mat.Size.x, mat.Size.y);
            tex.SetPixels(pixel);
            tex.Apply();
            return tex;
        }
        static public Texture2D ToTexRGBA(this Matrix mat, Func<float, UnityEngine.Color> ToColorFunc)
        {
            var length = mat.Size.x * mat.Size.y;
            var ele = mat.Element;
            UnityEngine.Color[] pixel = new UnityEngine.Color[length];
            Parallel.For(0, length, i => pixel[i] = ToColorFunc(ele[i]));
            var tex = new Texture2D(mat.Size.x, mat.Size.y);
            tex.SetPixels(pixel);
            tex.Apply();
            return tex;
        }

        static public Texture2D ToRGB(this Texture2D Tex, ColorChannel channel = ColorChannel.Red)
        {
            var length = Tex.width * Tex.height;
            UnityEngine.Color[] ele = Tex.GetPixels();
            UnityEngine.Color[] pixel = new UnityEngine.Color[length];
            switch (channel)
            {
                default:
                case ColorChannel.Red:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(ele[i].r, 0, 0));
                    break;
                case ColorChannel.Green:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(0, ele[i].g, 0));
                    break;
                case ColorChannel.Blue:
                    Parallel.For(0, length, i => pixel[i] = new UnityEngine.Color(0, 0, ele[i].b));
                    break;
            }
            var newTex = new Texture2D(Tex.width, Tex.height);
            newTex.SetPixels(pixel);
            newTex.Apply();
            return newTex;
        }

    }
}