using System;
using System.IO;
using NixWslWrapper.Core.Interfaces;

namespace NixWslWrapper.Infrastructure.IO
{
    public class ThreadedStreamCopier : IStreamCopier
    {
        private readonly int _bufferSize;

        public ThreadedStreamCopier(int bufferSize = 8192)
        {
            if (bufferSize <= 0)
                throw new ArgumentOutOfRangeException(nameof(bufferSize), "Buffer size must be positive.");
            _bufferSize = bufferSize;
        }

        public void Copy(Stream input, Stream output)
        {
            byte[] buffer = new byte[_bufferSize];
            int read;
            try
            {
                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
                {
                    output.Write(buffer, 0, read);
                    output.Flush();
                }
            }
            catch (IOException)
            {
                // Clean exit when stream is closed or process terminates
            }
            catch (ObjectDisposedException)
            {
                // Clean exit when streams are disposed
            }
            catch (Exception)
            {
                // General catch to ensure thread doesn't crash the host process
            }
        }
    }
}