using System.Drawing;
using System.Text;
using View_by_Distance.Shared.Models.Methods;

namespace View_by_Distance.BlurHash.Models;

public class BlurHasher : IBlurHasher
{

    string IBlurHasher.Encode(Image image) =>
#pragma warning disable CA1416
      image.Width < image.Height ? Encode(image, 4, 3) : Encode(image, 3, 4);
#pragma warning restore CA1416

    string IBlurHasher.EncodeAndSave(Image image, string directory) =>
#pragma warning disable CA1416
      image.Width < image.Height ? EncodeAndSave(image, 4, 3, 300, 190, directory) : EncodeAndSave(image, 3, 4, 300, 190, directory);
#pragma warning restore CA1416

    string IBlurHasher.Encode(Image image, int x, int y) =>
       Encode(image, x, y);

    string IBlurHasher.EncodeAndSave(Image image, int x, int y, string directory) =>
       EncodeAndSave(image, x, y, 300, 190, directory);

    internal static string Encode(Image image, int x, int y) =>
        System.Drawing.BlurHash.BlurHasher.Encode(image, x, y);

    public string EncodeAndSave(Image image, int x, int y, int width, int height, string directory)
    {
        string result;
        int actualByte;
        result = System.Drawing.BlurHash.BlurHasher.Encode(image, x, y);
        byte[] blurHashBytes = Encoding.UTF8.GetBytes(result);
        using Bitmap actualImage = (Bitmap)System.Drawing.BlurHash.BlurHasher.Decode(result, width, height);
        string joined = string.Join(string.Empty, blurHashBytes.Select(l => l.ToString("000")));
        string fileName = Path.Combine(directory, $"{x}x{y}-{width}x{height}-{joined}.png");
        if (!File.Exists(fileName))
        {
            using FileStream fileStream = new(fileName, FileMode.CreateNew);
#pragma warning disable CA1416
            actualImage.Save(fileStream, System.Drawing.Imaging.ImageFormat.Png);
#pragma warning restore CA1416
            _ = fileStream.Seek(0, SeekOrigin.Begin);
            actualByte = fileStream.ReadByte();
            while (actualByte > -1)
                actualByte = fileStream.ReadByte();
        }
        return result;
    }

}