acdream/src/AcDream.App/Streaming/LocalPlayerTeleportController.cs

using System.Numerics;
using AcDream.App.Input;
using AcDream.App.Net;
using AcDream.App.Physics;
using AcDream.App.Rendering;
using AcDream.App.Update;
using AcDream.App.World;
using AcDream.Core.Net;
using AcDream.Core.Net.Messages;
using AcDream.Core.Physics;
using AcDream.Core.Rendering;
using AcDream.Core.World;

namespace AcDream.App.Streaming;

internal interface ILocalPlayerTeleportNetworkSink
{
    void OnTeleportStarted(uint sequence);

    void OfferDestination(
        WorldSession.EntityPositionUpdate update,
        bool teleportTimestampAdvanced);

    void ResetSession();
}

/// <summary>
/// Construction-order bridge for the inbound session. It carries no teleport
/// state: after binding, every packet and reset is forwarded to the one
/// <see cref="LocalPlayerTeleportController"/> owner.
/// </summary>
internal sealed class DeferredLocalPlayerTeleportNetworkSink
    : ILocalPlayerTeleportNetworkSink
{
    private ILocalPlayerTeleportNetworkSink? _inner;

    public void Bind(ILocalPlayerTeleportNetworkSink inner)
    {
        ArgumentNullException.ThrowIfNull(inner);
        if (Interlocked.CompareExchange(ref _inner, inner, null) is not null)
            throw new InvalidOperationException("The local teleport sink is already bound.");
    }

    public IDisposable BindOwned(ILocalPlayerTeleportNetworkSink inner)
    {
        Bind(inner);
        return new Binding(this, inner);
    }

    private void Unbind(ILocalPlayerTeleportNetworkSink expected)
    {
        _ = Interlocked.CompareExchange(ref _inner, null, expected);
    }

    public void OnTeleportStarted(uint sequence) => Required().OnTeleportStarted(sequence);

    public void OfferDestination(
        WorldSession.EntityPositionUpdate update,
        bool teleportTimestampAdvanced) =>
        Required().OfferDestination(update, teleportTimestampAdvanced);

    public void ResetSession() => Required().ResetSession();

    private ILocalPlayerTeleportNetworkSink Required() =>
        _inner ?? throw new InvalidOperationException(
            "The local teleport sink was used before composition completed.");

    private sealed class Binding : IDisposable
    {
        private DeferredLocalPlayerTeleportNetworkSink? _owner;
        private readonly ILocalPlayerTeleportNetworkSink _expected;

        public Binding(
            DeferredLocalPlayerTeleportNetworkSink owner,
            ILocalPlayerTeleportNetworkSink expected)
        {
            _owner = owner;
            _expected = expected;
        }

        public void Dispose() =>
            Interlocked.Exchange(ref _owner, null)?.Unbind(_expected);
    }
}

internal interface ILocalPlayerTeleportInputLifetime
{
    void EndMouseLook();
}

internal interface ILocalPlayerTeleportModeOperations
{
    PlayerMovementController? Controller { get; }
    Matrix4x4 Projection { get; }
    bool TryEnterPortalSpace();
    void EnterWorld();
}

internal interface ILocalPlayerTeleportAuthority
{
    bool IsFreshStart(ushort sequence);
}

internal sealed class LiveLocalPlayerTeleportAuthority
    : ILocalPlayerTeleportAuthority
{
    private readonly LiveEntityRuntime _liveEntities;
    private readonly ILocalPlayerIdentitySource _identity;

    public LiveLocalPlayerTeleportAuthority(
        LiveEntityRuntime liveEntities,
        ILocalPlayerIdentitySource identity)
    {
        _liveEntities = liveEntities ?? throw new ArgumentNullException(nameof(liveEntities));
        _identity = identity ?? throw new ArgumentNullException(nameof(identity));
    }

    public bool IsFreshStart(ushort sequence) =>
        _liveEntities.IsFreshTeleportStart(_identity.ServerGuid, sequence);
}

internal interface ILocalPlayerTeleportStreamingOperations
{
    int CenterX { get; }
    int CenterY { get; }
    bool IsRecenterPending { get; }
    bool BeginRecenter(int x, int y, bool isSealedDungeon);
    bool ResetRecenter(bool sessionEnding);
    bool IsSealedDungeon(uint cellId);
}

internal sealed class LocalPlayerTeleportStreamingOperations
    : ILocalPlayerTeleportStreamingOperations
{
    private readonly LiveWorldOriginState _origin;
    private readonly StreamingOriginRecenterCoordinator _recenter;
    private readonly StreamingController _streaming;
    private readonly ISealedDungeonCellClassifier _sealedDungeonCells;

    public LocalPlayerTeleportStreamingOperations(
        LiveWorldOriginState origin,
        StreamingOriginRecenterCoordinator recenter,
        StreamingController streaming,
        ISealedDungeonCellClassifier sealedDungeonCells)
    {
        _origin = origin ?? throw new ArgumentNullException(nameof(origin));
        _recenter = recenter ?? throw new ArgumentNullException(nameof(recenter));
        _streaming = streaming ?? throw new ArgumentNullException(nameof(streaming));
        _sealedDungeonCells = sealedDungeonCells
            ?? throw new ArgumentNullException(nameof(sealedDungeonCells));
    }

    public int CenterX => _origin.CenterX;
    public int CenterY => _origin.CenterY;
    public bool IsRecenterPending => _recenter.IsPending;

    public bool BeginRecenter(int x, int y, bool isSealedDungeon) =>
        _recenter.Begin(x, y, isSealedDungeon);

    public bool ResetRecenter(bool sessionEnding) =>
        _recenter.Reset(sessionEnding);

    public bool IsSealedDungeon(uint cellId) =>
        _sealedDungeonCells.IsSealedDungeon(cellId);

}

internal interface ILocalPlayerTeleportPlacement
{
    void Place(Vector3 position, uint cellId, Quaternion rotation);
}

/// <summary>
/// Commits the local player's deferred portal arrival. It owns the exact
/// Place -&gt; root/controller/camera mutation -&gt; spatial reconcile edge.
/// </summary>
internal sealed class LocalPlayerTeleportPlacement : ILocalPlayerTeleportPlacement
{
    private readonly PhysicsEngine _physics;
    private readonly LiveEntityRuntime _liveEntities;
    private readonly ILocalPlayerIdentitySource _identity;
    private readonly ILocalPlayerControllerSource _controller;
    private readonly ILocalPlayerPhysicsHostSource _host;
    private readonly ChaseCameraInputState _cameras;
    private readonly LiveWorldOriginState _origin;
    private readonly ILiveSpatialReconcilePhase _spatial;

    public LocalPlayerTeleportPlacement(
        PhysicsEngine physics,
        LiveEntityRuntime liveEntities,
        ILocalPlayerIdentitySource identity,
        ILocalPlayerControllerSource controller,
        ILocalPlayerPhysicsHostSource host,
        ChaseCameraInputState cameras,
        LiveWorldOriginState origin,
        ILiveSpatialReconcilePhase spatial)
    {
        _physics = physics ?? throw new ArgumentNullException(nameof(physics));
        _liveEntities = liveEntities ?? throw new ArgumentNullException(nameof(liveEntities));
        _identity = identity ?? throw new ArgumentNullException(nameof(identity));
        _controller = controller ?? throw new ArgumentNullException(nameof(controller));
        _host = host ?? throw new ArgumentNullException(nameof(host));
        _cameras = cameras ?? throw new ArgumentNullException(nameof(cameras));
        _origin = origin ?? throw new ArgumentNullException(nameof(origin));
        _spatial = spatial ?? throw new ArgumentNullException(nameof(spatial));
    }

    public void Place(Vector3 position, uint cellId, Quaternion rotation)
    {
        PlayerMovementController controller = _controller.Controller
            ?? throw new InvalidOperationException(
                "Teleport Place ran without the local player controller.");
        var resolved = _physics.Resolve(
            position,
            cellId,
            Vector3.Zero,
            controller.StepUpHeight);
        var snapped = new Vector3(
            resolved.Position.X,
            resolved.Position.Y,
            resolved.Position.Z);

        uint playerGuid = _identity.ServerGuid;
        controller.SetPosition(
            snapped,
            resolved.CellId,
            CellLocalForSeed(snapped, resolved.CellId));

        // SnapToCell owns the retail Position frame and may normalize an
        // outdoor land-cell index from the cell-local origin. Publish that
        // canonical result, not the pre-snap resolver hint, to rendering.
        if (_liveEntities.MaterializedWorldEntities.TryGetValue(
                playerGuid,
                out WorldEntity? entity))
        {
            entity.SetPosition(controller.Position);
            entity.ParentCellId = controller.CellId;
            entity.Rotation = rotation;

            // Retail CPhysicsObj::enter_world installs the object in its
            // destination CObjCell before hidden scripts/particles resume.
            // The accepted Position packet has already advanced FullCellId,
            // but that wire fact alone does not move acdream's retained
            // projection out of its source/pending GPU bucket. Commit both
            // halves of the spatial move here, while portal space still owns
            // the viewport, so CPhysicsObj::update_object's cell-gated tail
            // can advance the Hidden/UnHide PES chain at retail's boundary.
            if (!_liveEntities.RebucketLiveEntity(playerGuid, controller.CellId))
            {
                throw new InvalidOperationException(
                    $"Teleport Place could not commit local player 0x{playerGuid:X8} "
                    + $"to destination cell 0x{controller.CellId:X8}.");
            }
        }

        // Retail teleport_hook tail @ 0x00514ED0 clears the local target and
        // notifies every watcher that this object teleported.
        _host.Host?.NotifyTeleported();
        controller.SetBodyOrientation(rotation);

        _cameras.Legacy?.Update(controller.Position, controller.Yaw);
        _cameras.Retail?.ResetViewerToPlayer(controller.Position, controller.Yaw);
        _spatial.Reconcile();

        PhysicsDiagnostics.LogTeleport(
            "PLACED",
            controller.CellId,
            "readiness=complete");
        Console.WriteLine(
            $"live: teleport materialized - snapped to {controller.Position} "
            + $"cell=0x{controller.CellId:X8}");
    }

    private Vector3 CellLocalForSeed(Vector3 worldPosition, uint cellId)
    {
        int landblockX = (int)((cellId >> 24) & 0xFFu);
        int landblockY = (int)((cellId >> 16) & 0xFFu);
        var origin = new Vector3(
            (landblockX - _origin.CenterX) * 192f,
            (landblockY - _origin.CenterY) * 192f,
            0f);
        return worldPosition - origin;
    }
}

internal interface ILocalPlayerTeleportSession
{
    void SendLoginComplete();
}

internal sealed class LocalPlayerTeleportSession : ILocalPlayerTeleportSession
{
    private readonly ILiveWorldSessionSource _session;

    public LocalPlayerTeleportSession(ILiveWorldSessionSource session) =>
        _session = session ?? throw new ArgumentNullException(nameof(session));

    public void SendLoginComplete() =>
        _session.CurrentSession?.SendGameAction(
            GameActionLoginComplete.Build());
}

internal interface ILocalPlayerTeleportPresentation : IDisposable
{
    bool IsPortalViewportVisible { get; }
    int CurrentTunnelFrame { get; }
    void Begin(Matrix4x4 projection);
    (TeleportAnimSnapshot Snapshot, IReadOnlyList<TeleportAnimEvent> Events)
        Tick(float deltaSeconds, bool worldReady);
    void TickTunnel(float deltaSeconds);
    void EnterTunnel();
    void ExitTunnel();
    void SetWaitCue(bool visible);
    void Reset();
    Matrix4x4 ApplyViewPlane(Matrix4x4 projection);
    ICamera ApplyViewPlane(ICamera camera);
    void DrawPortalViewport(int width, int height, Matrix4x4 projection);
}

internal sealed class LocalPlayerTeleportPresentation
    : ILocalPlayerTeleportPresentation
{
    private readonly TeleportAnimSequencer _animation = new();
    private readonly TeleportViewPlaneController _viewPlane = new();
    private readonly PortalTunnelPresentation _tunnel;

    public LocalPlayerTeleportPresentation(PortalTunnelPresentation tunnel) =>
        _tunnel = tunnel ?? throw new ArgumentNullException(nameof(tunnel));

    public bool IsPortalViewportVisible => _tunnel.IsVisible;
    public int CurrentTunnelFrame => _tunnel.CurrentAnimationFrame;

    public void Begin(Matrix4x4 projection)
    {
        _viewPlane.Begin(projection);
        _animation.Begin(TeleportEntryKind.Portal);
    }

    public (TeleportAnimSnapshot Snapshot, IReadOnlyList<TeleportAnimEvent> Events)
        Tick(float deltaSeconds, bool worldReady)
    {
        var (snapshot, events) = _animation.Tick(
            deltaSeconds,
            worldReady,
            CurrentTunnelFrame);
        _viewPlane.Update(snapshot);
        return (snapshot, events);
    }

    public void TickTunnel(float deltaSeconds) => _tunnel.Tick(deltaSeconds);
    public void EnterTunnel() => _tunnel.Enter();
    public void ExitTunnel() => _tunnel.Exit();
    public void SetWaitCue(bool visible) => _tunnel.SetWaitCue(visible);

    public void Reset()
    {
        _animation.Reset();
        _viewPlane.Reset();
        _tunnel.Exit();
    }

    public Matrix4x4 ApplyViewPlane(Matrix4x4 projection) =>
        _viewPlane.Apply(projection);

    public ICamera ApplyViewPlane(ICamera camera) => _viewPlane.ApplyTo(camera);

    public void DrawPortalViewport(int width, int height, Matrix4x4 projection) =>
        _tunnel.Draw(width, height, ApplyViewPlane(projection));

    public void Dispose() => _tunnel.Dispose();
}

/// <summary>
/// Single update-thread owner of the local F751/Position-correlated portal
/// lifetime: activation, destination aim, readiness hold, Place, viewport
/// transitions, LoginComplete, and session/reset symmetry.
/// </summary>
internal sealed class LocalPlayerTeleportController
    : ILocalPlayerTeleportFramePhase,
      ILocalPlayerTeleportNetworkSink,
      AcDream.App.Interaction.ISelectionViewPlaneSource,
      IDisposable
{
    private readonly TeleportTransitCoordinator<WorldSession.EntityPositionUpdate> _transit = new();
    private readonly ILocalPlayerTeleportAuthority _authority;
    private readonly ILocalPlayerTeleportInputLifetime _input;
    private readonly ILocalPlayerTeleportModeOperations _mode;
    private readonly ILocalPlayerTeleportStreamingOperations _streaming;
    private readonly WorldRevealCoordinator _worldReveal;
    private readonly ILocalPlayerTeleportPlacement _placement;
    private readonly ILocalPlayerTeleportSession _session;
    private readonly ILocalPlayerTeleportPresentation _presentation;

    private Vector3 _pendingPosition;
    private uint _pendingCell;
    private Quaternion _pendingRotation = Quaternion.Identity;
    private bool _hasAcceptedDestination;
    private WorldSession.EntityPositionUpdate _acceptedDestination;
    private float _holdSeconds;
    private long _lifetimeGeneration;
    private bool _disposed;

    public LocalPlayerTeleportController(
        ILocalPlayerTeleportAuthority authority,
        ILocalPlayerTeleportInputLifetime input,
        ILocalPlayerTeleportModeOperations mode,
        ILocalPlayerTeleportStreamingOperations streaming,
        WorldRevealCoordinator worldReveal,
        ILocalPlayerTeleportPlacement placement,
        ILocalPlayerTeleportSession session,
        ILocalPlayerTeleportPresentation presentation)
    {
        _authority = authority ?? throw new ArgumentNullException(nameof(authority));
        _input = input ?? throw new ArgumentNullException(nameof(input));
        _mode = mode ?? throw new ArgumentNullException(nameof(mode));
        _streaming = streaming ?? throw new ArgumentNullException(nameof(streaming));
        _worldReveal = worldReveal ?? throw new ArgumentNullException(nameof(worldReveal));
        _placement = placement ?? throw new ArgumentNullException(nameof(placement));
        _session = session ?? throw new ArgumentNullException(nameof(session));
        _presentation = presentation ?? throw new ArgumentNullException(nameof(presentation));
    }

    public bool IsActive => _transit.IsActive;
    public bool IsPortalViewportVisible => _presentation.IsPortalViewportVisible;
    public uint ActiveDestinationCell => _transit.IsActive ? _pendingCell : 0u;

    public void OnTeleportStarted(uint sequence)
    {
        ThrowIfDisposed();
        ushort teleportSequence = (ushort)sequence;
        if (!_authority.IsFreshStart(teleportSequence)
            || !_transit.CanBegin(teleportSequence))
        {
            return;
        }

        long observedGeneration = _lifetimeGeneration;
        _input.EndMouseLook();
        if (_lifetimeGeneration != observedGeneration)
            return;

        long resetGeneration = ResetTransit(clearSession: false);
        if (_lifetimeGeneration != resetGeneration)
            return;

        _transit.QueueStart(teleportSequence);
        TryActivatePendingPresentation();
        Console.WriteLine($"live: teleport queued (seq={sequence})");
    }

    public void OfferDestination(
        WorldSession.EntityPositionUpdate update,
        bool teleportTimestampAdvanced)
    {
        ThrowIfDisposed();
        if (_transit.OfferDestination(
            update.TeleportSequence,
            teleportTimestampAdvanced,
            update,
            out WorldSession.EntityPositionUpdate destination))
        {
            AcceptDestination(destination);
        }
    }

    public void Tick(float deltaSeconds)
    {
        ThrowIfDisposed();
        TryActivatePendingPresentation();
        TryAimAcceptedDestination();
        if (!_transit.IsActive)
            return;

        long generation = _lifetimeGeneration;
        ushort sequence = _transit.Sequence;
        if (!_mode.TryEnterPortalSpace()
            || !IsCurrentLifetime(generation, sequence)
            || _mode.Controller is null)
        {
            return;
        }

        bool haveDestination = _pendingCell != 0u;
        bool originReady = !_streaming.IsRecenterPending;
        bool ready = haveDestination
            && originReady
            && _worldReveal.Evaluate(_pendingCell).IsReady;
        if (!IsCurrentLifetime(generation, sequence))
            return;

        if (haveDestination && !ready)
            _holdSeconds += deltaSeconds;
        _presentation.SetWaitCue(
            haveDestination
            && !ready
            && _worldReveal.ObserveWait(
                TimeSpan.FromSeconds(_holdSeconds)));

        var (_, events) = _presentation.Tick(deltaSeconds, ready);
        if (!IsCurrentLifetime(generation, sequence))
            return;

        foreach (TeleportAnimEvent teleportEvent in events)
        {
            switch (teleportEvent)
            {
                case TeleportAnimEvent.Place:
                    _placement.Place(
                        _pendingPosition,
                        _pendingCell,
                        _pendingRotation);
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    _worldReveal.ObserveMaterialized();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    break;
                case TeleportAnimEvent.EnterTunnel:
                    _presentation.EnterTunnel();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    break;
                case TeleportAnimEvent.PlayExitSound:
                    // gmSmartBoxUI::UseTime @ 0x004D6E30 releases destination
                    // cell blocking at the exact portal/world viewport swap.
                    // LoginComplete remains one WorldFadeIn second later.
                    _worldReveal.RevealWorldViewport();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    _presentation.ExitTunnel();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    break;
                case TeleportAnimEvent.FireLoginComplete:
                    _mode.EnterWorld();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    _session.SendLoginComplete();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    _worldReveal.Complete();
                    if (!IsCurrentLifetime(generation, sequence))
                        return;
                    ResetTransit(clearSession: false);
                    return;
                default:
                    // ClientUISystem sound-table enum playback remains outside
                    // this already-accepted presentation extraction.
                    break;
            }
        }

        _presentation.TickTunnel(deltaSeconds);
    }

    public void ResetSession()
    {
        ThrowIfDisposed();
        ResetTransit(clearSession: true);
    }

    public Matrix4x4 ApplyViewPlane(Matrix4x4 projection) =>
        _presentation.ApplyViewPlane(projection);

    public ICamera ApplyViewPlane(ICamera camera) =>
        _presentation.ApplyViewPlane(camera);

    public void DrawPortalViewport(int width, int height, Matrix4x4 projection) =>
        _presentation.DrawPortalViewport(width, height, projection);

    private void TryActivatePendingPresentation()
    {
        if (!_transit.HasPendingStart)
            return;

        long generation = _lifetimeGeneration;
        if (!_mode.TryEnterPortalSpace()
            || _lifetimeGeneration != generation
            || !_transit.HasPendingStart)
        {
            return;
        }

        _holdSeconds = 0f;
        _presentation.Begin(_mode.Projection);
        if (_lifetimeGeneration != generation || !_transit.HasPendingStart)
            return;

        bool hasBufferedDestination = _transit.Activate(out var destination);
        if (hasBufferedDestination)
            AcceptDestination(destination);
        Console.WriteLine(
            $"live: teleport presentation started (seq={_transit.Sequence})");
    }

    private void AcceptDestination(WorldSession.EntityPositionUpdate destination)
    {
        _acceptedDestination = destination;
        _hasAcceptedDestination = true;
        TryAimAcceptedDestination();
    }

    private void TryAimAcceptedDestination()
    {
        if (!_hasAcceptedDestination || !_transit.IsActive)
            return;

        long generation = _lifetimeGeneration;
        ushort sequence = _transit.Sequence;
        PlayerMovementController? controller = _mode.Controller;
        if (controller is null)
        {
            if (!_mode.TryEnterPortalSpace()
                || !IsCurrentLifetime(generation, sequence))
            {
                return;
            }

            controller = _mode.Controller;
            if (controller is null)
                return;
        }

        WorldSession.EntityPositionUpdate destination = _acceptedDestination;
        if (!AimDestination(destination, controller, generation, sequence))
            return;

        if (IsCurrentLifetime(generation, sequence))
        {
            _hasAcceptedDestination = false;
            _acceptedDestination = default;
        }
    }

    private bool AimDestination(
        WorldSession.EntityPositionUpdate update,
        PlayerMovementController controller,
        long generation,
        ushort sequence)
    {
        var position = update.Position;
        int landblockX = (int)((position.LandblockId >> 24) & 0xFFu);
        int landblockY = (int)((position.LandblockId >> 16) & 0xFFu);
        uint streamingOriginLandblockId = StreamingRegion.EncodeLandblockId(
            _streaming.CenterX,
            _streaming.CenterY);
        var origin = new Vector3(
            (landblockX - _streaming.CenterX) * 192f,
            (landblockY - _streaming.CenterY) * 192f,
            0f);
        var translated = new Vector3(
            position.PositionX,
            position.PositionY,
            position.PositionZ) + origin;

        TeleportLandblockTransition transition = TeleportLandblockTransition.Classify(
            controller.CellId,
            position.LandblockId,
            streamingOriginLandblockId);
        int oldX = (int)((transition.SourceLandblockId >> 24) & 0xFFu);
        int oldY = (int)((transition.SourceLandblockId >> 16) & 0xFFu);

        Console.WriteLine(
            $"live: teleport arrival - old lb=({oldX},{oldY}) "
            + $"new lb=({landblockX},{landblockY}) "
            + $"dist={Vector3.Distance(translated, controller.Position):F1}");

        // Retail SmartBox enters blocking_for_cells before old-world object,
        // physics, landscape, and ambient owners may advance again. Begin the
        // reveal generation before a recenter can start detaching that world.
        _worldReveal.Begin(WorldRevealKind.Portal, position.LandblockId);
        if (!IsCurrentLifetime(generation, sequence))
            return false;

        Vector3 worldPosition;
        if (transition.ChangesStreamingCenter)
        {
            bool isSealedDungeon = _streaming.IsSealedDungeon(
                position.LandblockId);
            if (!IsCurrentLifetime(generation, sequence))
                return false;

            _streaming.BeginRecenter(
                landblockX,
                landblockY,
                isSealedDungeon);
            if (!IsCurrentLifetime(generation, sequence))
                return false;
            worldPosition = new Vector3(
                position.PositionX,
                position.PositionY,
                position.PositionZ);
        }
        else
        {
            worldPosition = translated;
        }

        _pendingRotation = new Quaternion(
            position.RotationX,
            position.RotationY,
            position.RotationZ,
            position.RotationW);
        _pendingPosition = worldPosition;
        _pendingCell = position.LandblockId;
        _holdSeconds = 0f;
        PhysicsDiagnostics.LogTeleport(
            "AIM",
            position.LandblockId,
            $"seq={update.TeleportSequence} lb={landblockX},{landblockY} "
            + $"indoor={((position.LandblockId & 0xFFFFu) >= 0x0100u)} "
            + $"playerCross={transition.CrossesLandblock} "
            + $"centerChange={transition.ChangesStreamingCenter}");
        return true;
    }

    private long ResetTransit(bool clearSession)
    {
        long generation = checked(++_lifetimeGeneration);
        if (clearSession)
        {
            _transit.ClearSession();
        }
        else
        {
            _transit.EndActive();
        }

        _pendingPosition = default;
        _pendingCell = 0u;
        _pendingRotation = Quaternion.Identity;
        _hasAcceptedDestination = false;
        _acceptedDestination = default;
        _holdSeconds = 0f;

        _streaming.ResetRecenter(clearSession);
        if (_lifetimeGeneration != generation)
            return generation;

        _worldReveal.Cancel();
        if (_lifetimeGeneration != generation)
            return generation;

        _presentation.Reset();
        if (_lifetimeGeneration != generation)
            return generation;

        return generation;
    }

    private bool IsCurrentLifetime(long generation, ushort sequence) =>
        _lifetimeGeneration == generation
        && _transit.IsActive
        && _transit.Sequence == sequence;

    private void ThrowIfDisposed() =>
        ObjectDisposedException.ThrowIf(_disposed, this);

    public void Dispose()
    {
        if (_disposed)
            return;
        _presentation.Dispose();
        _disposed = true;
    }
}