using NetMQ;
using NetMQ.Sockets;
using RPG.Services.Core.Network.Command;
using RPG.Services.Core.Options;

namespace RPG.Services.Core.Network;
internal class ServiceEndPoint
{
    private readonly NetMQSocket _socket;

    private CancellationTokenSource? _receiveCancellation;

    public delegate Task CommandEventHandler(ServiceCommand command);
    public event CommandEventHandler? OnCommand;

    public ServiceEndPoint(ServiceNodeOptions.Entry optionsEntry)
    {
        _socket = new PullSocket($"@tcp://{optionsEntry.Host}:{optionsEntry.Port}");
        _socket.Options.ReceiveHighWatermark = 10000;
    }

    public void Start()
    {
        _receiveCancellation = new();
        _ = Task.Run(() => Receive(_receiveCancellation.Token));
    }

    private async Task Receive(CancellationToken cancellationToken)
    {
        try
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                NetMQMessage netMessage = _socket.ReceiveMultipartMessage();
                while (!netMessage.IsEmpty)
                {
                    byte[] buffer = netMessage.Pop().Buffer;
                    if (OnCommand != null)
                        await OnCommand(ServiceCommandEncoder.DecodeCommand(buffer));
                }
            }
        }
        catch
        {
            if (!_socket.IsDisposed) _socket.Close();
        }
    }

    public async Task StopAsync()
    {
        if (_receiveCancellation != null)
        {
            await _receiveCancellation.CancelAsync();
        }
    }
}