using System.Diagnostics;
using System.IO;

namespace ytLive.Services;

/// <summary>
/// The real <see cref="IDecodeProcess"/>: a <see cref="Process"/> with stdout
/// redirected as raw bytes for reading <c>rawvideo</c> frames. Constructed by
/// <see cref="MediaVideoSource"/> for the media-file decoder subprocess.
/// </summary>
public sealed class FfmpegDecodeProcess : IDecodeProcess
{
    private readonly Process _process;

    public FfmpegDecodeProcess() => _process = new Process { EnableRaisingEvents = true };

    public void Start(ProcessStartInfo startInfo)
    {
        _process.StartInfo = startInfo;
        _process.Start();
    }

    public Stream StandardOutput => _process.StandardOutput.BaseStream;

    public bool HasExited => _process.HasExited;
    public int ExitCode => _process.ExitCode;
    public void Kill()
    {
        if (!_process.HasExited) _process.Kill();
    }

    public Task WaitForExitAsync(CancellationToken cancellationToken = default)
        => _process.WaitForExitAsync(cancellationToken);

    public void Dispose() => _process.Dispose();
}