using System.Net;
using AcDream.Core.Net;
using AcDream.Core.Net.Messages;

namespace AcDream.Core.Net.Tests;

/// <summary>
/// Phase I.3 — verifies that <see cref="WorldSession.SendTalk"/>,
/// <see cref="WorldSession.SendTell"/>, and <see cref="WorldSession.SendChannel"/>
/// produce the same wire bytes that <see cref="ChatRequests"/> builders do,
/// using a sequence number drawn from <see cref="WorldSession.NextGameActionSequence"/>.
///
/// <para>
/// Uses the internal <c>GameActionCapture</c> test seam to intercept the
/// game-action body before it hits the (unseeded) ISAAC-encrypted wire path.
/// </para>
/// </summary>
public sealed class WorldSessionChatTests
{
    private static WorldSession NewSession()
    {
        // Bind to a throwaway loopback endpoint; we never actually
        // exchange packets — the capture hook intercepts the body.
        var ep = new IPEndPoint(IPAddress.Loopback, 65000);
        return new WorldSession(ep);
    }

    [Fact]
    public void SendTalk_EmitsBytesIdenticalToChatRequestsBuildTalk()
    {
        using var session = NewSession();
        byte[]? captured = null;
        session.GameActionCapture = body => captured = body;

        session.SendTalk("hello");

        // After SendTalk, the sequence counter has been incremented to 1.
        // ChatRequests.BuildTalk(seq=1, "hello") should match exactly.
        byte[] expected = ChatRequests.BuildTalk(1, "hello");
        Assert.NotNull(captured);
        Assert.Equal(expected, captured);
    }

    [Fact]
    public void SendTell_EmitsBytesIdenticalToChatRequestsBuildTell()
    {
        using var session = NewSession();
        byte[]? captured = null;
        session.GameActionCapture = body => captured = body;

        session.SendTell("Alice", "hey");

        byte[] expected = ChatRequests.BuildTell(1, "Alice", "hey");
        Assert.NotNull(captured);
        Assert.Equal(expected, captured);
    }

    [Fact]
    public void SendChannel_IncrementsSequence_AndMatchesBuildChatChannel()
    {
        using var session = NewSession();
        var captured = new System.Collections.Generic.List<byte[]>();
        session.GameActionCapture = body => captured.Add(body);

        session.SendChannel(channelId: 0x00000800u, "raid plan");
        session.SendChannel(channelId: 0x02000000u, "allegiance ping");

        Assert.Equal(2, captured.Count);
        Assert.Equal(ChatRequests.BuildChatChannel(1, 0x00000800u, "raid plan"),     captured[0]);
        Assert.Equal(ChatRequests.BuildChatChannel(2, 0x02000000u, "allegiance ping"), captured[1]);
    }

    [Fact]
    public void SendTalk_NullText_Throws()
    {
        using var session = NewSession();
        Assert.Throws<ArgumentNullException>(() => session.SendTalk(null!));
    }
}