// <copyright file="SocketConnectionTest.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.Network.Tests;

using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.Extensions.Logging.Abstractions;
using Pipelines.Sockets.Unofficial;

/// <summary>
/// Test of the async connection implementation.
/// </summary>
[TestFixture]
[Ignore("It's using real sockets")]
public class SocketConnectionTest
{
    /// <summary>
    /// Tests the receive function with a pipelined connection object.
    /// </summary>
    [Test]
    public void TestReceivePipelined()
    {
        this.TestReceivePipelined(socket => new Connection(SocketConnection.Create(socket), null, null, new NullLogger<Connection>()));
    }

    /// <summary>
    /// Tests the receive function with a pipelined connection object with encryptor/decryptor.
    /// </summary>
    [Test]
    public void TestReceivePipelinedWithEncryption()
    {
        this.TestReceivePipelined(socket =>
        {
            var socketConnection = SocketConnection.Create(socket);
            return new Connection(socketConnection, new PipelinedDecryptor(socketConnection.Input), new PipelinedEncryptor(socketConnection.Output), new NullLogger<Connection>());
        });
    }

    /// <summary>
    /// Tests if the connection is disconnected after sending invalid data.
    /// </summary>
    [Test]
    public async Task TestDisconnectOnInvalidHeaderSentAsync()
    {
        IConnection? connection = null;
        var server = new TcpListener(IPAddress.Any, 5000);
        server.Start();
        try
        {
            server.BeginAcceptSocket(
                asyncResult =>
                {
                    var clientSocket = server.EndAcceptSocket(asyncResult);
                    var socketConnection = SocketConnection.Create(clientSocket);
                    connection = new Connection(socketConnection, new PipelinedDecryptor(socketConnection.Input), new PipelinedEncryptor(socketConnection.Output), new NullLogger<Connection>());
                }, null);

            using var client = new TcpClient("127.0.0.1", 5000);
            while (connection == null)
            {
                Thread.Sleep(10);
            }

#pragma warning disable 4014
            connection.BeginReceiveAsync();
#pragma warning restore 4014

            var packet = new byte[22222];
            packet[0] = 0xDE;
            packet[1] = 0xAD;
            packet[2] = 0xBE;
            packet[3] = 0xAF;
            await connection.Output.WriteAsync(packet).ConfigureAwait(false);
            await Task.Delay(1000).ConfigureAwait(false);

            Assert.That(connection.Connected, Is.False);
        }
        finally
        {
            server.Stop();
        }
    }

    /// <summary>
    /// Tests if the connection is disconnected after receiving invalid data.
    /// </summary>
    [Test]
    public void TestDisconnectOnInvalidHeaderReceived()
    {
        var server = new TcpListener(IPAddress.Any, 5000);
        server.Start();
        try
        {
            server.BeginAcceptSocket(
                asyncResult =>
                {
                    var clientSocket = server.EndAcceptSocket(asyncResult);
                    var packet = new byte[] { 0xDE, 0xAD, 0xBE, 0xEF, 0, 0, 0, 0, 0, 0 };
                    clientSocket.BeginSend(packet, 0, packet.Length, SocketFlags.None, null, null);
                }, null);

            using var client = new TcpClient("127.0.0.1", 5000);
            var socketConnection = SocketConnection.Create(client.Client);
            var connection = new Connection(socketConnection, new PipelinedDecryptor(socketConnection.Input), new PipelinedEncryptor(socketConnection.Output), new NullLogger<Connection>());

            _ = connection.BeginReceiveAsync();

            Thread.Sleep(100);
            Assert.That(connection.Connected, Is.False);
        }
        finally
        {
            server.Stop();
        }
    }

    /// <summary>
    /// Tests the receiving of data with any <see cref="IConnection"/> implementation.
    /// </summary>
    /// <param name="connectionCreator">The connection creator.</param>
    private void TestReceivePipelined(Func<Socket, IConnection> connectionCreator)
    {
        const int maximumPacketCount = 1000;

        IConnection? connection = null;
        var server = new TcpListener(IPAddress.Any, 5000);
        server.Start();
        server.BeginAcceptSocket(
            asyncResult =>
            {
                var clientSocket = server.EndAcceptSocket(asyncResult);
                connection = connectionCreator(clientSocket);
            }, null);
        using (var client = new TcpClient("127.0.0.1", 5000))
        {
            while (connection == null)
            {
                Thread.Sleep(10);
            }

            int packetCount = 0;
            connection.PacketReceived += async p => Interlocked.Increment(ref packetCount);
            _ = connection.BeginReceiveAsync();

            var packet = new byte[] { 0xC1, 10, 0, 0, 0, 0, 0, 0, 0, 0 };
            for (int i = 0; i < maximumPacketCount; i++)
            {
                client.Client.BeginSend(packet, 0, packet.Length, SocketFlags.None, null, null);
            }

            while (packetCount < maximumPacketCount)
            {
                Thread.Sleep(1);
            }
        }

        server.Stop();
    }
}