// SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs
using Microsoft.Extensions.Logging.Abstractions;
using NUnit.Framework;
using SVSim.BattleNode.Bridge;
using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Protocol.Bodies;
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, context: FixtureCtx(), log: NullLogger<BattleSession>.Instance);
    }

    private static MatchContext FixtureCtx() => new(
        SelfDeckCardIds: Enumerable.Range(1, 30).Select(i => 100_011_010L).ToList(),
        ClassId: "1", CharaId: "1", CardMasterName: "card_master_node_10015",
        CountryCode: "KOR", UserName: "Player", SleeveId: "3000011",
        EmblemId: "701441011", DegreeId: "300003", FieldId: 43, IsOfficial: 0,
        BattleType: 11);

    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 RawBody(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_WithIdxListContainingTwo_ProducesHandWithFreshIdxAtPosition1()
    {
        var s = NewSession();
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.Loaded));
        // Simulate the client's Swap{idxList:[2]}: the dict shape produced by MsgEnvelope.FromJson
        // (a List<object?> of boxed long values), wrapped in a RawBody as the inbound type.
        var swapEnv = new MsgEnvelope(
            NetworkBattleUri.Swap, ViewerId: 1, Uuid: "u", Bid: null, Try: 0,
            Cat: EmitCategory.Battle, PubSeq: null, PlaySeq: null,
            Body: new RawBody(new Dictionary<string, object?>
            {
                ["idxList"] = new List<object?> { 2L },
            }));

        var responses = s.ComputeResponses(swapEnv);

        var swapBody = (SwapResponseBody)responses[0].Envelope.Body;
        Assert.That(swapBody.Self[0].Idx, Is.EqualTo(1));
        Assert.That(swapBody.Self[1].Idx, Is.EqualTo(4));  // swapped — fresh deck idx
        Assert.That(swapBody.Self[2].Idx, Is.EqualTo(3));
    }

    [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 TurnEnd_AfterReady_PushesOpponentTurnStart_ThenTurnEnd_StaysInAfterReady()
    {
        var s = NewSession();
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeResponses(NewEnvelope(NetworkBattleUri.Swap));

        var responses = s.ComputeResponses(NewEnvelope(NetworkBattleUri.TurnEnd));

        // Two-frame cycle: opponent opens its turn, immediately ends it, hands control back.
        Assert.That(responses.Select(r => r.Envelope.Uri),
            Is.EqualTo(new[] { NetworkBattleUri.TurnStart, NetworkBattleUri.TurnEnd }));
        Assert.That(responses.Select(r => r.NoStock),
            Is.EqualTo(new[] { false, false }));
        // Phase returns to AfterReady within the same call; the next player TurnEnd can fire
        // the cycle again. (OpponentTurn is set transiently inside ComputeResponses to document
        // intent, but is never externally observable.)
        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));
    }
}