// <copyright file="PacketTwisterTest.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 MUnique.OpenMU.Network.PacketTwister;

/// <summary>
/// Tests for the  <see cref="PacketTwistRunner"/>.
/// </summary>
[TestFixture]
public class PacketTwisterTest
{
    /// <summary>
    /// Tests encryption and decryption using the <see cref="PacketTwistRunner"/>.
    /// </summary>
    [Test]
    public void EncryptDecryptWithPacketTwister()
    {
        var decrypted = Convert.FromBase64String("w7gAudHEjjSP53H6Rkp3oXj7B9z+rVDR2f0Is4bvsIsUL3RM/aTDB2FX9YG3Hkboy1Z1JThot558MeDTvNuunzfl5RbWK6TTOP97prjPGbq3IOcweopTq3fVz8vD8EuFqVVJ0jgvEZ+xoe047RHmrRgmG5zzfSWtkTmeAVzZD0i09f1jhUeBiA5HfticGr5m7iGzndSvkSwvm0D/kRBD15GlhPgTgyfQpJONrP5NEHd7NxI6JnJzBQ==");
        var packetTwister = new PacketTwister.PacketTwistRunner();
        for (byte packetType = 0; packetType < byte.MaxValue; packetType++)
        {
            decrypted[2] = packetType;
            var result = decrypted.ToArray();
            packetTwister.Encrypt(result);
            packetTwister.Decrypt(result);
            CompareArrays(decrypted, result);
        }
    }

    private static void CompareArrays(byte[] expected, byte[] actual)
    {
        Assert.That(actual.Length, Is.EqualTo(expected.Length));
        for (int i = 0; i < actual.Length; i++)
        {
            Assert.That(actual[i], Is.EqualTo(expected[i]), "index {0}, packet type {1}", i, expected[expected.GetPacketHeaderSize()]);
        }
    }
}