using System.Security.Cryptography;

namespace Harmonia.Core.Imaging;

public class SongPictureInfo : IDisposable
{
    public required Stream Stream { get; init; }
    public string? ImageHash { get; init; }
    public required string ImageName { get; init; }
    public long Size { get; init; }

    private SongPictureInfo()
    {

    }

    public static SongPictureInfo FromStream(Stream stream)
    {
        string imageHash = ComputeImageHash(stream);

        return GetSongPictureInfo(stream, "Embedded", imageHash);
    }

    private static string ComputeImageHash(Stream stream)
    {
        using var md5 = MD5.Create();
        byte[] hash = md5.ComputeHash(stream);

        return Convert.ToHexStringLower(hash);
    }

    public static SongPictureInfo FromFile(string fileName)
    {
        using FileStream fileStream = File.OpenRead(fileName);

        return GetSongPictureInfo(fileStream, fileName);
    }

    private static SongPictureInfo GetSongPictureInfo(Stream stream, string imageName, string? imageHash = null)
    {
        stream.Seek(0, SeekOrigin.Begin);

        SongPictureInfo songPictureInfo = new()
        {
            Stream = stream,
            ImageHash = imageHash,
            ImageName = imageName,
            Size = stream.Length
        };

        return songPictureInfo;
    }

    public void Dispose()
    {
        Stream.Dispose();
        GC.SuppressFinalize(this);
    }
}