using System.Diagnostics;

namespace Encoder.Lib;

public class EncodeWorker
{
    private readonly ProcessStartInfo startInfo;

    public EncodeWorker(string workingDirectory, string inputFile, string outputFile, string encodeParam)
    {
        var arguments = $"-y -i \"{inputFile}\" {encodeParam} \"{outputFile}\"";
        this.startInfo = new ProcessStartInfo()
        {
            FileName = "ffmpeg",
            WorkingDirectory = workingDirectory,
            Arguments = arguments,
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            CreateNoWindow = true,
        };
    }

    public async ValueTask<int> Run()
    {
        try
        {
            Console.WriteLine($"{this.startInfo.FileName} {this.startInfo.Arguments}");
            using Process? process = Process.Start(this.startInfo);
            if (process is null)
            {
                throw new FileNotFoundException();
            }

            await process.StandardError.ReadToEndAsync().ConfigureAwait(false);
            await process.WaitForExitAsync().ConfigureAwait(false);
            return process.ExitCode;
        }
        catch
        {
            return -1;
        }
    }
}