// SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs
using Microsoft.Extensions.Logging.Abstractions;
using NUnit.Framework;
using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Sessions;

namespace SVSim.UnitTests.BattleNode.Sessions;

[TestFixture]
public class BattleSessionDispatchTests
{
    private static BattleSession NewSession()
    {
        // ws is unused by ComputeResponses; pass null! and rely on the test never invoking the pump.
        return new BattleSession(ws: null!, battleId: "bid-1", viewerId: 1, log: NullLogger<BattleSession>.Instance);
    }

    private static MsgEnvelope NewEnvelope(NetworkBattleUri uri) =>
        new(uri, ViewerId: 1, Uuid: "u", Bid: null, Try: 0, Cat: EmitCategory.Battle,
            PubSeq: null, PlaySeq: null, Body: new Dictionary<string, object?>());

    [Test]
    public void InitNetwork_PushesAckOnly_TransitionsToAwaitingInitBattle()
    {
        var s = NewSession();
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        Assert.That(responses.Select(r => r.Envelope.Uri),
            Is.EqualTo(new[] { NetworkBattleUri.InitNetwork }));
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.AwaitingInitBattle));
    }

    [Test]
    public void InitBattle_PushesMatched_TransitionsToAwaitingLoaded()
    {
        var s = NewSession();
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitBattle));
        Assert.That(responses.Single().Envelope.Uri, Is.EqualTo(NetworkBattleUri.Matched));
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.AwaitingLoaded));
    }

    [Test]
    public void Loaded_PushesBattleStartThenDeal_TransitionsToAwaitingSwap()
    {
        var s = NewSession();
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitBattle));
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.Loaded));
        Assert.That(responses.Select(r => r.Envelope.Uri),
            Is.EqualTo(new[] { NetworkBattleUri.BattleStart, NetworkBattleUri.Deal }));
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.AwaitingSwap));
    }

    [Test]
    public void Swap_PushesSwapResponseThenReady_TransitionsToAfterReady()
    {
        var s = NewSession();
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.Loaded));
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.Swap));
        Assert.That(responses.Select(r => r.Envelope.Uri),
            Is.EqualTo(new[] { NetworkBattleUri.Swap, NetworkBattleUri.Ready }));
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.AfterReady));
    }

    [Test]
    public void Retire_PushesBattleFinishNoContest_TransitionsToTerminal()
    {
        var s = NewSession();
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.Retire));
        var (env, noStock) = responses.Single();
        Assert.That(env.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(noStock, Is.True);
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.Terminal));
    }

    [Test]
    public void Kill_PushesBattleFinishNoContest_TransitionsToTerminal()
    {
        var s = NewSession();
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.Kill));
        var (env, noStock) = responses.Single();
        Assert.That(env.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(noStock, Is.True);
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.Terminal));
    }

    [Test]
    public void Swap_ArrivingBeforeLoaded_ProducesNoResponseAndDoesNotAdvancePhase()
    {
        var s = NewSession();
        // Skip Loaded — fire Swap straight out of AwaitingInitNetwork.
        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.Swap));
        Assert.That(responses, Is.Empty);
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.AwaitingInitNetwork));
    }
}