SVSimServer/SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs

using Microsoft.Extensions.Logging.Abstractions;
using NUnit.Framework;
using SVSim.BattleNode.Bridge;
using SVSim.BattleNode.Lifecycle;
using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Protocol.Bodies;
using SVSim.BattleNode.Sessions;
using SVSim.BattleNode.Sessions.Participants;

namespace SVSim.UnitTests.BattleNode.Sessions;

[TestFixture]
public class BattleSessionDispatchTests
{
    [Test]
    public void Pvp_Loaded_from_A_assigns_turnState_0()
    {
        var (s, a, _) = NewPvpSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));

        var bs = (BattleStartBody)routes[0].Frame.Body;
        Assert.That(bs.TurnState, Is.EqualTo(0), "A (first arriver) goes first.");
    }

    [Test]
    public void Pvp_Loaded_from_B_assigns_turnState_1()
    {
        var (s, _, b) = NewPvpSession();
        s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.InitBattle));
        var routes = s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.Loaded));

        var bs = (BattleStartBody)routes[0].Frame.Body;
        Assert.That(bs.TurnState, Is.EqualTo(1), "B (second arriver) goes second.");
    }

    [Test]
    public void Handshake_dispatch_reads_per_participant_Phase_not_session_Phase()
    {
        var a = new FakeRealParticipant(viewerId: 1, FixtureCtx());
        var b = new FakeRealParticipant(viewerId: 2, FixtureCtx());
        var s = new BattleSession("bid-1", BattleType.Pvp, a, b, NullLogger<BattleSession>.Instance);

        // A is AwaitingInitNetwork; B is AwaitingInitBattle (manually set).
        b.Phase = BattleSessionPhase.AwaitingInitBattle;

        // A's InitNetwork should ack (matches A's phase).
        var routesA = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        Assert.That(routesA.Count, Is.EqualTo(1));
        Assert.That(routesA[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.InitNetwork));
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AwaitingInitBattle));

        // B's InitBattle should produce Matched (matches B's phase, set above).
        var routesB = s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.InitBattle));
        Assert.That(routesB.Count, Is.EqualTo(1));
        Assert.That(routesB[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Matched));
        Assert.That(b.Phase, Is.EqualTo(BattleSessionPhase.AwaitingLoaded));
    }

    [Test]
    public void OutOfOrder_dispatch_returns_empty_and_does_not_advance_phase()
    {
        var (s, a, _) = NewPvpSession();
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        Assert.That(routes, Is.Empty);
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AwaitingInitNetwork));
    }

    [Test]
    public void Pvp_InitBattle_from_A_pushes_Matched_with_B_oppoInfo_to_A_only()
    {
        var (s, a, b) = NewPvpSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(a));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Matched));

        var body = (MatchedBody)routes[0].Frame.Body;
        Assert.That(body.SelfInfo.UserName, Is.EqualTo("PlayerA"),
            "Matched.selfInfo must reflect the sender (A).");
        Assert.That(body.SelfInfo.OppoId, Is.EqualTo(b.ViewerId));
        Assert.That(body.OppoInfo.UserName, Is.EqualTo("PlayerB"),
            "Matched.oppoInfo must reflect the OTHER participant (B).");
        Assert.That(body.OppoInfo.OppoId, Is.EqualTo(a.ViewerId));
        Assert.That(body.SelfInfo.Seed, Is.EqualTo(body.OppoInfo.Seed),
            "Both sides must see the same seed.");
    }

    [Test]
    public void Pvp_InitBattle_from_B_pushes_Matched_with_A_oppoInfo_to_B_only()
    {
        var (s, a, b) = NewPvpSession();
        s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.InitNetwork));
        var routes = s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.InitBattle));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
        var body = (MatchedBody)routes[0].Frame.Body;
        Assert.That(body.SelfInfo.UserName, Is.EqualTo("PlayerB"));
        Assert.That(body.OppoInfo.UserName, Is.EqualTo("PlayerA"));
    }

    [Test]
    public void Pvp_Loaded_from_A_pushes_BattleStart_with_B_oppoInfo_plus_Deal_to_A()
    {
        var (s, a, b) = NewPvpSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));

        Assert.That(routes.Count, Is.EqualTo(2));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.BattleStart));
        Assert.That(routes[1].Frame.Uri, Is.EqualTo(NetworkBattleUri.Deal));
        Assert.That(routes.All(r => ReferenceEquals(r.Target, a)), Is.True);

        var bs = (BattleStartBody)routes[0].Frame.Body;
        Assert.That(bs.SelfInfo.ClassId, Is.EqualTo("3"), "A is class 3 per fixture.");
        Assert.That(bs.OppoInfo.ClassId, Is.EqualTo("5"), "B is class 5 per fixture.");
    }

    [Test]
    public void Pvp_Swap_from_A_alone_pushes_SwapResponse_only_Ready_withheld()
    {
        var (s, a, b) = NewPvpSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        Assert.That(routes.Select(r => r.Frame.Uri), Is.EqualTo(new[] { NetworkBattleUri.Swap }),
            "Ready is withheld until BOTH sides have mulliganed.");
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AfterReady),
            "Phase advances on Swap even though Ready is withheld.");
    }

    [Test]
    public void Pvp_Swap_from_both_releases_Ready_to_both_with_opponent_hands()
    {
        var (s, a, b) = NewPvpSession();
        foreach (var p in new[] { a, b })
        {
            s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.InitNetwork));
            s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.InitBattle));
            s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.Loaded));
        }

        var aRoutes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap)); // first swapper
        Assert.That(aRoutes.Select(r => r.Frame.Uri), Is.EqualTo(new[] { NetworkBattleUri.Swap }));

        var bRoutes = s.ComputeFrames(b, NewEnvelope(NetworkBattleUri.Swap)); // second swapper releases both
        // Expect: B's own SwapResponse, then Ready to B, then Ready to A.
        Assert.That(bRoutes.Count, Is.EqualTo(3));
        Assert.That(bRoutes[0].Target, Is.SameAs(b));
        Assert.That(bRoutes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Swap));

        var readyToB = bRoutes.Single(r => ReferenceEquals(r.Target, b) && r.Frame.Uri == NetworkBattleUri.Ready);
        var readyToA = bRoutes.Single(r => ReferenceEquals(r.Target, a) && r.Frame.Uri == NetworkBattleUri.Ready);
        // Empty mulligans → each hand is the dealt [1,2,3]; oppo mirrors the other side's hand.
        Assert.That(((ReadyBody)readyToB.Frame.Body).Oppo.Select(p => p.Idx), Is.EqualTo(new[] { 1, 2, 3 }));
        Assert.That(((ReadyBody)readyToA.Frame.Body).Oppo.Select(p => p.Idx), Is.EqualTo(new[] { 1, 2, 3 }));
    }

    [Test]
    public void Pvp_TurnStart_from_A_emits_spin0_to_B()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnStart));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.TurnStart));
        var body = (SVSim.BattleNode.Protocol.Bodies.OpponentTurnStartBody)routes[0].Frame.Body;
        Assert.That(body.Spin, Is.EqualTo(0));
    }

    [Test]
    public void Pvp_Judge_from_A_reflects_spin0_back_to_sender()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Judge));

        // Judge reflects BACK to its sender (the turn taker-over), not to the opponent: receiving
        // Judge{spin} fires the sender's ControlTurnStartPlayer. Routing to the opponent would
        // restart the just-ended player's turn (2026-06-03 two-client capture).
        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(a));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Judge));
        var body = (SVSim.BattleNode.Protocol.Bodies.JudgeBody)routes[0].Frame.Body;
        Assert.That(body.Spin, Is.EqualTo(0));
    }

    [Test]
    public void Pvp_PlayActions_synthesizes_knownList_from_sender_deck()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var body = MoveOrderList(idx: 3, from: 10, to: 20);
        body["playIdx"] = 3L;
        body["type"] = 30L;

        var routes = s.ComputeFrames(a, EnvWith(NetworkBattleUri.PlayActions, body));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.PlayActions));
        var pb = (PlayActionsBroadcastBody)routes[0].Frame.Body;
        Assert.That(pb.PlayIdx, Is.EqualTo(3));
        Assert.That(pb.Type, Is.EqualTo(30));
        Assert.That(pb.KnownList!.Count, Is.EqualTo(1));
        Assert.That(pb.KnownList[0].Idx, Is.EqualTo(3));
        Assert.That(pb.KnownList[0].CardId, Is.EqualTo(100_011_010L)); // PlayerACtx deck cardId
        Assert.That(pb.KnownList[0].To, Is.EqualTo(20));
        Assert.That(pb.OppoTargetList, Is.Null);
    }

    [Test]
    public void Pvp_PlayActions_renames_targetList_to_oppoTargetList()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var body = MoveOrderList(idx: 3, from: 10, to: 20);
        body["playIdx"] = 3L;
        body["type"] = 31L;
        body["targetList"] = new List<object?>
        {
            new Dictionary<string, object?> { ["targetIdx"] = 8L, ["isSelf"] = 0L },
        };

        var routes = s.ComputeFrames(a, EnvWith(NetworkBattleUri.PlayActions, body));
        var pb = (PlayActionsBroadcastBody)routes[0].Frame.Body;

        Assert.That(pb.OppoTargetList!.Count, Is.EqualTo(1));
        Assert.That(pb.OppoTargetList[0].TargetIdx, Is.EqualTo(8));
        Assert.That(pb.OppoTargetList[0].IsSelf, Is.EqualTo(0));
    }

    [Test]
    public void Pvp_PlayActions_token_idx_degrades_to_no_knownList()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var body = MoveOrderList(idx: 31, from: 10, to: 20); // idx 31 > 30-card deck → token
        body["playIdx"] = 31L;
        body["type"] = 30L;

        var routes = s.ComputeFrames(a, EnvWith(NetworkBattleUri.PlayActions, body));
        var pb = (PlayActionsBroadcastBody)routes[0].Frame.Body;

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(pb.PlayIdx, Is.EqualTo(31));
        Assert.That(pb.KnownList, Is.Null);
    }

    [Test]
    public void Pvp_PlayActions_when_B_still_AwaitingSwap_drops()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        // B not AfterReady → not BothAfterReady.
        var body = MoveOrderList(3, 10, 20);
        body["playIdx"] = 3L; body["type"] = 30L;
        var routes = s.ComputeFrames(a, EnvWith(NetworkBattleUri.PlayActions, body));
        Assert.That(routes, Is.Empty);
    }

    [Test]
    public void Pvp_Echo_from_A_in_BothAfterReady_is_consumed_not_relayed()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Echo));

        Assert.That(routes, Is.Empty, "Echo has no inbound handler on the client; relaying risks an echo storm.");
    }

    [Test]
    public void Pvp_TurnEndActions_from_A_emits_empty_body_to_B()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var body = MoveOrderList(3, 20, 30); // a non-empty orderList that must be dropped
        var routes = s.ComputeFrames(a, EnvWith(NetworkBattleUri.TurnEndActions, body));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.TurnEndActions));
        Assert.That(((RawBody)routes[0].Frame.Body).Entries, Is.Empty, "orderList is dropped; body is empty.");
    }

    [Test]
    public void Pvp_JudgeResult_from_A_in_BothAfterReady_forwards_to_B()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.JudgeResult));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
    }

    [Test]
    public void Pvp_TurnEnd_from_A_emits_turnState_to_B_only()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnEnd));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(b));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.TurnEnd));
        var body = (SVSim.BattleNode.Protocol.Bodies.TurnEndBody)routes[0].Frame.Body;
        Assert.That(body.TurnState, Is.EqualTo(0));
    }

    [Test]
    public void Pvp_TurnEndFinal_from_A_forwards_envelope_to_B_and_pushes_paired_BattleFinish()
    {
        // Unified TurnEndFinal handling — A is the winner, B is the loser.
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnEndFinal));

        Assert.That(routes.Count, Is.EqualTo(3));

        Assert.That(routes[0].Target, Is.SameAs(b));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.TurnEndFinal));

        Assert.That(routes[1].Target, Is.SameAs(a));
        Assert.That(routes[1].Frame.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(((BattleFinishBody)routes[1].Frame.Body).Result, Is.EqualTo(BattleResult.LifeWin));

        Assert.That(routes[2].Target, Is.SameAs(b));
        Assert.That(routes[2].Frame.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(((BattleFinishBody)routes[2].Frame.Body).Result, Is.EqualTo(BattleResult.LifeLose));

        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.Terminal));
    }

    [Test]
    public void Pvp_TurnEnd_when_B_still_AwaitingSwap_drops()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        // B not at AfterReady.

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnEnd));

        Assert.That(routes, Is.Empty);
    }

    [Test]
    public void Pvp_Retire_from_A_pushes_RetireLose_to_A_and_RetireWin_to_B()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Retire));

        Assert.That(routes.Count, Is.EqualTo(2));
        var aRoute = routes.Single(r => ReferenceEquals(r.Target, a));
        var bRoute = routes.Single(r => ReferenceEquals(r.Target, b));
        Assert.That(aRoute.Frame.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(((BattleFinishBody)aRoute.Frame.Body).Result, Is.EqualTo(BattleResult.RetireLose));
        Assert.That(bRoute.Frame.Uri, Is.EqualTo(NetworkBattleUri.BattleFinish));
        Assert.That(((BattleFinishBody)bRoute.Frame.Body).Result, Is.EqualTo(BattleResult.RetireWin));
        Assert.That(aRoute.NoStock, Is.True);
        Assert.That(bRoute.NoStock, Is.True);
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.Terminal));
    }

    [Test]
    public void Pvp_Kill_from_A_same_as_Retire()
    {
        var (s, a, b) = NewPvpSession();
        DriveToAfterReady(s, a);
        DriveToAfterReady(s, b);

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Kill));

        Assert.That(routes.Count, Is.EqualTo(2));
        Assert.That(s.Phase, Is.EqualTo(BattleSessionPhase.Terminal));
    }

    private static (BattleSession, FakeRealParticipant, FakeParticipant) NewBotSession()
    {
        var a = new FakeRealParticipant(viewerId: 1001, PlayerACtx());
        var b = new FakeParticipant(viewerId: ServerBattleFrames.FakeOpponentViewerId, NoOpBotContext());
        var s = new BattleSession("bid-bot-1", BattleType.Bot, a, b, NullLogger<BattleSession>.Instance);
        return (s, a, b);
    }

    private static MatchContext NoOpBotContext() => new(
        SelfDeckCardIds: Array.Empty<long>(),
        ClassId: "0", CharaId: "0", CardMasterName: "card_master_node_10015",
        CountryCode: "", UserName: "Bot", SleeveId: "0",
        EmblemId: "0", DegreeId: "0", FieldId: 0, IsOfficial: 0, BattleType: 0);

    [Test]
    public void Bot_InitNetwork_acks_to_sender()
    {
        var (s, a, _) = NewBotSession();
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(a));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.InitNetwork));
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AwaitingInitBattle));
    }

    [Test]
    public void Bot_InitBattle_acks_to_sender_with_no_Matched_push()
    {
        var (s, a, _) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));

        // Bot InitBattle is ack-only — NO Matched push. Matched would be ignored
        // by the client anyway (gated on status == Connect, which is already
        // past by the time the wire round-trip completes), but the spec is to
        // not send it for clarity.
        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Target, Is.SameAs(a));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.InitBattle),
            "Expected an ack envelope for InitBattle, NOT a Matched envelope.");
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AwaitingLoaded));
    }

    [Test]
    public void Bot_Loaded_produces_no_routes_but_advances_phase()
    {
        var (s, a, _) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));

        // Bot Loaded is silent — no BattleStart, no Deal. Pushing BattleStart
        // would actively CORRUPT OppoBattleStartInfo on the client (the wire
        // handler at Matching.cs:417 → SetNetworkInfo overwrites it with our
        // placeholder NoOpBotParticipant.Context zeros).
        Assert.That(routes, Is.Empty, "Bot Loaded is silent.");
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AwaitingSwap),
            "Phase still advances even though there are no outbound routes.");
    }

    [Test]
    public void Bot_Swap_per_sender_SwapResponse_plus_Ready()
    {
        // Opponent stub is not IHasHandshakePhase → not a barrier swapper → Ready releases immediately.
        var (s, a, _) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        Assert.That(routes.Select(r => r.Frame.Uri),
            Is.EqualTo(new[] { NetworkBattleUri.Swap, NetworkBattleUri.Ready }));
        Assert.That(routes.All(r => ReferenceEquals(r.Target, a)), Is.True);
        Assert.That(a.Phase, Is.EqualTo(BattleSessionPhase.AfterReady));
    }

    [Test]
    public void Bot_TurnEnd_pushes_Judge_to_sender_only()
    {
        var (s, a, b) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnEnd));

        Assert.That(routes.Count, Is.EqualTo(1), "Bot TurnEnd → exactly one Judge frame back.");
        Assert.That(routes[0].Target, Is.SameAs(a), "Judge target is the sender, not broadcast.");
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Judge));
    }

    [Test]
    public void Bot_TurnEndFinal_pushes_Judge_to_sender_only()
    {
        var (s, a, _) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.TurnEndFinal));

        Assert.That(routes.Count, Is.EqualTo(1));
        Assert.That(routes[0].Frame.Uri, Is.EqualTo(NetworkBattleUri.Judge));
        Assert.That(routes[0].Target, Is.SameAs(a));
    }

    [Test]
    public void Bot_PlayActions_drops_no_recipient()
    {
        var (s, a, _) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        // Bot's PlayActions falls through the default arm — the Pvp forwarder is gated
        // on Type == Pvp, so Bot's gameplay frames have no routing rule and drop.
        // (The PvP semantics would have been "forward to NoOp which swallows" — same
        // observable result, but cleaner to leave them as default-drops.)
        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.PlayActions));

        Assert.That(routes, Is.Empty);
    }

    [Test]
    public void Bot_Retire_pushes_paired_BattleFinish_RetireLose_to_player_RetireWin_to_bot()
    {
        // Unified Retire/Kill dispatch — same paired push as PvP.
        // NoOpBotParticipant swallows its push.
        var (s, a, b) = NewBotSession();
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Swap));

        var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Retire));

        Assert.That(routes.Count, Is.EqualTo(2));
        Assert.That(routes[0].Target, Is.SameAs(a));
        Assert.That(((BattleFinishBody)routes[0].Frame.Body).Result, Is.EqualTo(BattleResult.RetireLose));
        Assert.That(routes[1].Target, Is.SameAs(b));
        Assert.That(((BattleFinishBody)routes[1].Frame.Body).Result, Is.EqualTo(BattleResult.RetireWin));
    }

    private static (BattleSession, FakeRealParticipant, FakeRealParticipant) NewPvpSession()
    {
        var a = new FakeRealParticipant(viewerId: 1001, PlayerACtx());
        var b = new FakeRealParticipant(viewerId: 2002, PlayerBCtx());
        var s = new BattleSession("bid-pvp-1", BattleType.Pvp, a, b, NullLogger<BattleSession>.Instance);
        return (s, a, b);
    }

    private static void DriveToAfterReady(BattleSession s, FakeRealParticipant p)
    {
        s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.InitNetwork));
        s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.InitBattle));
        s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.Loaded));
        s.ComputeFrames(p, NewEnvelope(NetworkBattleUri.Swap));
        // p.Phase should now be AfterReady.
    }

    private static MatchContext PlayerACtx() => new(
        SelfDeckCardIds: Enumerable.Range(1, 30).Select(_ => 100_011_010L).ToList(),
        ClassId: "3", CharaId: "3", CardMasterName: "card_master_node_10015",
        CountryCode: "KOR", UserName: "PlayerA", SleeveId: "3000011",
        EmblemId: "701441011", DegreeId: "300003", FieldId: 43, IsOfficial: 0,
        BattleType: 11);

    private static MatchContext PlayerBCtx() => new(
        SelfDeckCardIds: Enumerable.Range(1, 30).Select(_ => 200_011_010L).ToList(),
        ClassId: "5", CharaId: "5", CardMasterName: "card_master_node_10015",
        CountryCode: "JPN", UserName: "PlayerB", SleeveId: "3000022",
        EmblemId: "701441022", DegreeId: "300004", FieldId: 44, IsOfficial: 0,
        BattleType: 11);

    private static MatchContext FixtureCtx() => new(
        SelfDeckCardIds: Enumerable.Range(1, 30).Select(_ => 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?>()));

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

    private static Dictionary<string, object?> MoveOrderList(int idx, int from, int to) => new()
    {
        ["orderList"] = new List<object?>
        {
            new Dictionary<string, object?>
            {
                ["move"] = new Dictionary<string, object?>
                {
                    ["idx"] = new List<object?> { (long)idx },
                    ["isSelf"] = 1L, ["from"] = (long)from, ["to"] = (long)to,
                }
            }
        }
    };

    /// <summary>Data-only IBattleParticipant stub for dispatch tests. PushAsync/RunAsync
    /// are no-ops; FrameEmitted exists but is never invoked by the test.</summary>
    private sealed class FakeParticipant : IBattleParticipant
    {
        public long ViewerId { get; }
        public MatchContext Context { get; }
        public event Func<MsgEnvelope, CancellationToken, Task>? FrameEmitted;
        public FakeParticipant(long viewerId, MatchContext context) { ViewerId = viewerId; Context = context; }
        public Task PushAsync(MsgEnvelope env, bool noStock, CancellationToken ct) => Task.CompletedTask;
        public Task RunAsync(CancellationToken ct) => Task.CompletedTask;
        public Task TerminateAsync(BattleFinishReason reason) => Task.CompletedTask;
        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
        private void Touch() => FrameEmitted?.Invoke(null!, default);
    }

    /// <summary>Like <see cref="FakeParticipant"/> but additionally implements
    /// <see cref="IHasHandshakePhase"/> so the dispatch tests can drive a participant's
    /// Phase without instantiating a full <c>RealParticipant</c> (which needs a real
    /// WebSocket).</summary>
    private sealed class FakeRealParticipant : IBattleParticipant, IHasHandshakePhase
    {
        public long ViewerId { get; }
        public MatchContext Context { get; }
        public BattleSessionPhase Phase { get; set; } = BattleSessionPhase.AwaitingInitNetwork;
        public event Func<MsgEnvelope, CancellationToken, Task>? FrameEmitted;
        public FakeRealParticipant(long viewerId, MatchContext context) { ViewerId = viewerId; Context = context; }
        public Task PushAsync(MsgEnvelope env, bool noStock, CancellationToken ct) => Task.CompletedTask;
        public Task RunAsync(CancellationToken ct) => Task.CompletedTask;
        public Task TerminateAsync(BattleFinishReason reason) => Task.CompletedTask;
        public ValueTask DisposeAsync() => ValueTask.CompletedTask;
        private void Touch() => FrameEmitted?.Invoke(null!, default);
    }
}