using System;

namespace DotnetStreams
{
	public class BytesReadEventArgs
	{
		public byte[] Data { get; }
		public int Size { get; }
		public BytesReadEventArgs(byte[] data, int size)
		{
			this.Data = data;
			this.Size = size;
		}
	}

	public delegate void BytesReadEventHandler(object sender, BytesReadEventArgs e);

	public class BinaryStdinReader
	{
		protected readonly Action<byte[], int> dataReceiverProc;
		protected readonly Action<int> doneProc;
		public event BytesReadEventHandler OnBytesRead;
		public event EventHandler OnDone;
		public BinaryStdinReader(Action<byte[], int> dataReceiverProc, Action<int> doneProc)
		{
			this.dataReceiverProc = dataReceiverProc;
			this.doneProc = doneProc;
		}

		public BinaryStdinReader()
		{
		}

		public void ReadBytes(Action<byte[], int> receiverProc, Action<int> doneProc)
		{
			using System.IO.Stream stdinStream = System.Console.OpenStandardInput();

			int totalBytesRead = 0;
			int bufferSize = 2048;
			byte[] buffer = new byte[bufferSize];
			int bytesRead = stdinStream.Read(buffer, 0, bufferSize);
			while (bytesRead > 0)
			{
				OnBytesRead?.Invoke(this, new BytesReadEventArgs(buffer, bytesRead));
				receiverProc?.Invoke(buffer, bytesRead);

				if (bytesRead < bufferSize)
					break;

				bytesRead = stdinStream.Read(buffer, 0, bufferSize);
				totalBytesRead += bytesRead;
			}

			OnDone?.Invoke(this, new EventArgs());
			doneProc?.Invoke(totalBytesRead);
		}
	}
}