using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace Xtremegaida.DataStructures;

public class DataQueueStreamWriter : IDataQueueWriter, IDisposable, IAsyncDisposable
{
	private readonly Stream baseStream;
	private readonly bool keepStreamOpen;
	private volatile bool disposed;
	private long totalBytesWritten;
	private byte[] byteWrite;

	public bool IsWriteClosed => disposed;
	public long TotalBytesWritten => totalBytesWritten;

	public DataQueueStreamWriter(Stream baseStream, bool keepStreamOpen = false)
	{
		this.baseStream = baseStream;
		this.keepStreamOpen = keepStreamOpen;
	}

	public ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default)
	{
		Interlocked.Add(ref totalBytesWritten, buffer.Length);
		return baseStream.WriteAsync(buffer, cancellationToken);
	}

	public ValueTask WriteByteAsync(byte data, CancellationToken cancellationToken = default)
	{
		if (byteWrite == null) { byteWrite = new byte[1]; }
		byteWrite[0] = data;
		Interlocked.Increment(ref totalBytesWritten);
		return baseStream.WriteAsync(byteWrite, cancellationToken);
	}

	public void CloseWrite()
	{
		Dispose();
	}

	public void Dispose()
	{
		if (disposed) { return; }
		disposed = true;
		if (!keepStreamOpen) { baseStream.Dispose(); }
	}

	public async ValueTask DisposeAsync()
	{
		if (disposed) { return; }
		disposed = true;
		if (!keepStreamOpen) { await baseStream.DisposeAsync(); }
	}
}