turnstone/tests/test_server_authz.py

"""HTTP-boundary authorization tests for turnstone-server.

Covers the ownership gates added in PR #2 (sec-1 through sec-9 +
sec-11) and the kind-validation branches that PR #1 tightened but
never had Starlette-level regression coverage.  Each test crosses
the middleware → handler boundary via ``TestClient`` so the JWT
decoding, scope extraction, and audit-context wiring are all exercised.
"""

from __future__ import annotations

import json
import queue
import threading
from typing import Any
from unittest.mock import MagicMock

import pytest
from starlette.testclient import TestClient

from tests._helpers import wait_until
from turnstone.core.workstream import INTERJECTION_CAP_CHARS

_TEST_JWT_SECRET = "test-jwt-secret-minimum-32-chars!"


# Default permission set for test JWTs.  Mirrors what builtin-operator
# carries: enough perms to exercise create/close/approve gates without
# turning every existing test into a re-authorization round.  Tests
# negating these gates pass ``permissions=frozenset()`` explicitly.
_DEFAULT_TEST_PERMS = frozenset(
    {"workstreams.create", "workstreams.close", "tools.approve", "conversation.modify"}
)


def _make_jwt(
    user_id: str,
    *,
    scopes: frozenset[str] | None = None,
    permissions: frozenset[str] | None = None,
) -> str:
    from turnstone.core.auth import JWT_AUD_SERVER, create_jwt

    return create_jwt(
        user_id=user_id,
        scopes=scopes or frozenset({"read", "write", "approve"}),
        source="test",
        secret=_TEST_JWT_SECRET,
        audience=JWT_AUD_SERVER,
        permissions=_DEFAULT_TEST_PERMS if permissions is None else permissions,
    )


def _auth(
    user: str,
    *,
    scopes: frozenset[str] | None = None,
    permissions: frozenset[str] | None = None,
) -> dict[str, str]:
    return {"Authorization": f"Bearer {_make_jwt(user, scopes=scopes, permissions=permissions)}"}


class TestAssignableScopes:
    """``service`` scope is a cross-tenant bypass and must never be
    GRANTED via a user-facing token mint (admin API or CLI) — otherwise an
    ``admin.users`` holder could self-mint it and see every private
    project's workstreams.  Both mint paths route through
    :func:`reject_unassignable_scopes`."""

    def test_service_scope_rejected(self) -> None:
        from turnstone.core.auth import reject_unassignable_scopes

        assert reject_unassignable_scopes("service") is not None
        assert reject_unassignable_scopes("read,service") is not None
        assert reject_unassignable_scopes("read,write,approve,service") is not None

    def test_service_not_in_assignable_set(self) -> None:
        from turnstone.core.auth import ASSIGNABLE_SCOPES, VALID_SCOPES

        assert "service" in VALID_SCOPES  # still a valid runtime scope
        assert "service" not in ASSIGNABLE_SCOPES  # but not user-assignable

    def test_ordinary_scopes_accepted(self) -> None:
        from turnstone.core.auth import reject_unassignable_scopes

        assert reject_unassignable_scopes("read") is None
        assert reject_unassignable_scopes("read,write,approve") is None

    def test_empty_and_unknown_rejected(self) -> None:
        from turnstone.core.auth import reject_unassignable_scopes

        assert reject_unassignable_scopes("") is not None
        assert reject_unassignable_scopes("bogus") is not None


# ---------------------------------------------------------------------------
# FakeUI / FakeSession doubles — match the shape the create handler expects
# ---------------------------------------------------------------------------


class _FakeUI:
    def __init__(self, ws_id: str = "", user_id: str = "", **_kw: Any) -> None:
        self.ws_id = ws_id
        self._user_id = user_id
        self.auto_approve = False
        self.auto_approve_tools: set[str] = set()
        self._auto_approve_tools_source: dict[str, str] = {}
        self._enqueued: list[dict[str, Any]] = []
        self.states: list[str] = []
        self.infos: list[str] = []
        self.errors: list[str] = []
        self._listeners: list[queue.Queue[dict[str, Any]]] = []
        self._listeners_lock = threading.Lock()
        self._pending_approval: dict[str, Any] | None = None
        self._approval_event = threading.Event()
        self._fg_event = threading.Event()
        self._ws_lock = threading.Lock()
        # Dashboard handler reads these fields under _ws_lock to build
        # per-ws summary rows; keep them zero/empty for the fake so the
        # handler doesn't need to special-case.
        self._ws_prompt_tokens = 0
        self._ws_completion_tokens = 0
        self._ws_tool_calls: dict[str, int] = {}
        self._ws_context_ratio = 0.0
        self._ws_current_activity = ""
        self._ws_activity_state = ""
        self._ws_messages = 0
        self._ws_turn_tool_calls = 0
        self._llm_verdicts: dict[str, dict[str, Any]] = {}

    def serialize_pending_approval_details(self) -> list[dict[str, Any]]:
        # Mirrors SessionUIBase.serialize_pending_approval_details —
        # the fake is monkeypatched in for ``WebUI`` and the dashboard
        # handler reads this method during projection. Real subclasses
        # iterate their approval-cycle registry (one entry per live
        # cycle); the fake models a single slot, so the list carries
        # zero or one entries.
        pending = self._pending_approval
        if pending is None:
            return []
        items = pending.get("items") or []
        if not items:
            return []
        call_ids = [item.get("call_id", "") for item in items]
        # Match the real impl's pattern (session_ui_base.py): snapshot
        # references under the lock, copy after release. Writers only
        # assign — never mutate — so the reference snapshot is stable
        # outside the lock window.
        with self._ws_lock:
            verdict_refs = {
                cid: self._llm_verdicts[cid]
                for cid in call_ids
                if cid and cid in self._llm_verdicts
            }
        verdicts = {cid: dict(v) for cid, v in verdict_refs.items()}
        serialized: list[dict[str, Any]] = []
        for item in items:
            cid = item.get("call_id", "")
            serialized.append(
                {
                    "call_id": cid,
                    "header": item.get("header", ""),
                    "preview": item.get("preview", ""),
                    "func_name": item.get("func_name", ""),
                    "approval_label": item.get("approval_label", ""),
                    "needs_approval": item.get("needs_approval", False),
                    "error": item.get("error"),
                    "heuristic_verdict": item.get("verdict"),
                    "judge_verdict": verdicts.get(cid),
                }
            )
        # Primary call_id must mirror the real serializer: first
        # *non-empty* in list order, not just first. Aligning the
        # fake here keeps test-vs-prod behavioural drift from
        # masking a real-shape regression.
        primary = next((cid for cid in call_ids if cid), "")
        return [
            {
                "cycle_id": pending.get("cycle_id", ""),
                "call_id": primary,
                "judge_pending": bool(pending.get("judge_pending", False)),
                "items": serialized,
            }
        ]

    def serialize_recent_auto_approvals(self) -> list[dict[str, Any]]:
        # Empty buffer for tests that don't exercise the auto-approve
        # visibility path.  /dashboard handler reads this method
        # unconditionally now (paired with serialize_pending_approval_detail);
        # returning [] keeps the row payload compatible without
        # modeling the full ring buffer in the fake.
        return []

    def _register_listener(self) -> queue.Queue[dict[str, Any]]:
        q: queue.Queue[dict[str, Any]] = queue.Queue()
        with self._listeners_lock:
            self._listeners.append(q)
        return q

    def _enqueue(self, ev: dict[str, Any]) -> None:
        self._enqueued.append(ev)

    def on_stream_end(self) -> None:
        pass

    def on_state_change(self, state: str) -> None:
        self.states.append(state)

    def on_info(self, msg: str) -> None:
        self.infos.append(msg)

    def on_error(self, msg: str) -> None:
        self.errors.append(msg)

    def resolve_approval(self, *_a: Any, **_kw: Any) -> None:
        self._approval_event.set()


class _FakeSession:
    def __init__(self, ws_id: str = "", user_id: str = "") -> None:
        self.ws_id = ws_id
        self.user_id = user_id
        self.model = "test-model"
        self.model_alias = ""
        self.reasoning_effort = ""
        self.context_window = 100000
        self.messages: list[Any] = []
        self._last_usage: dict[str, int] | None = None
        self._pending_retry: str | None = None
        # Real sessions always carry one; the /send route's cancel-drain
        # poll reads it whenever a worker is live at send time.
        self._cancel_event = threading.Event()
        self.sends: list[tuple[str, Any, Any]] = []
        self.commands: list[str] = []
        self.compacts = 0
        self.compact_principals: list[str | None] = []
        self.compact_raises: BaseException | None = None
        self.send_raises: BaseException | None = None
        self.exit_commands: set[str] = set()
        self.queued_flushes = 0
        self.queued_text = ""
        # Gates let a test hold the worker slot open mid-command so a
        # concurrent /send provably lands in the PARK path.
        self.compact_gate: threading.Event | None = None
        self.command_gate: threading.Event | None = None
        self.command_raises: BaseException | None = None
        # Gate for send() — lets a test hold a TURN in flight so a
        # deferred entry provably lands in (or is refused by) the
        # interjection fallback at drain time.
        self.send_gate: threading.Event | None = None
        # Every queue_message call — the defer invariant is that command
        # windows NEVER reach the interjection queue.
        self.queue_calls: list[str] = []
        # When set, queue_message records the attempt and then raises it
        # (e.g. CrossUserInterjectionError for the drain's re-park arm).
        self.queue_raises: BaseException | None = None
        # Principals for whom the fake models a retained queue item owned by
        # somebody else.  The real session checks this at fresh-slot admission.
        self.foreign_queue_principals: set[str] = set()
        self.fork_calls: list[tuple[str, str, bool]] = []
        # DELETE /send fall-through: ids the route asked this session to
        # dequeue (the fake never holds interjections, so it returns
        # False and the route falls through to the deferred-send list).
        self.dequeues: list[str] = []

    def send(self, text: str, *, attachments: Any = None, send_id: Any = None) -> None:
        self.sends.append((text, attachments, send_id))
        if self.send_gate is not None:
            self.send_gate.wait(timeout=10)
        if self.send_raises is not None:
            raise self.send_raises

    def queue_message(
        self,
        text: str,
        attachment_ids: Any = None,
        queue_msg_id: str | None = None,
        interjector_user_id: str = "",
        turn_principal_id: str | None = None,
    ) -> tuple[str, str, str]:
        del turn_principal_id
        self.queue_calls.append(text)
        if self.queue_raises is not None:
            raise self.queue_raises
        cap = INTERJECTION_CAP_CHARS
        cleaned = text[:cap] + "..." if len(text) > cap else text
        return cleaned, "notice", queue_msg_id or "m1"

    def has_foreign_queued_messages(self, principal_id: str) -> bool:
        return principal_id in self.foreign_queue_principals

    def dequeue_message(self, msg_id: str) -> bool:
        self.dequeues.append(msg_id)
        return False

    def set_watch_runner(self, *_a: Any, **_kw: Any) -> None:
        pass

    def resume(self, _ws_id: str, *, fork: bool = False) -> bool:
        return False

    def fork_from_storage(
        self,
        source_ws_id: str,
        *,
        principal_id: str,
        source_reservation_token: str,
        trusted_internal: bool = False,
    ) -> Any:
        from turnstone.core.storage import get_storage

        self.fork_calls.append((source_ws_id, principal_id, trusted_internal))
        storage = get_storage()
        assert storage is not None
        assert source_reservation_token
        snapshot = storage.clone_workstream(
            source_ws_id,
            self.ws_id,
            principal_id=principal_id,
            trusted_internal=trusted_internal,
        )
        self.messages = list(snapshot.turns)
        return snapshot

    def cancel(self) -> None:
        pass

    def close(self) -> None:
        pass

    def handle_command(self, cmd: str) -> bool:
        self.commands.append(cmd)
        if self.command_gate is not None:
            self.command_gate.wait(timeout=10)
        if self.command_raises is not None:
            raise self.command_raises
        return cmd in self.exit_commands

    def compact_now(self, *, principal_id: str | None = None) -> bool:
        self.compacts += 1
        self.compact_principals.append(principal_id)
        if self.compact_gate is not None:
            self.compact_gate.wait(timeout=10)
        if self.compact_raises is not None:
            raise self.compact_raises
        return True

    def flush_queued_messages(self) -> bool:
        self.queued_flushes += 1
        had, self.queued_text = bool(self.queued_text), ""
        return had

    def request_title_refresh(self, _title: str, *, principal_id: str = "") -> None:
        del principal_id
        pass


@pytest.fixture
def app_client(tmp_path, monkeypatch):
    """Full turnstone-server app with in-memory workstreams + fake sessions."""
    from turnstone.core.adapters.interactive_adapter import InteractiveAdapter
    from turnstone.core.metrics import MetricsCollector
    from turnstone.core.session_manager import SessionManager
    from turnstone.core.storage import get_storage, init_storage, reset_storage
    from turnstone.server import WebUI, create_app

    reset_storage()
    init_storage("sqlite", path=str(tmp_path / "t.db"), run_migrations=False)

    metrics = MetricsCollector()
    metrics.model = "test-model"
    monkeypatch.setattr("turnstone.server._metrics", metrics)
    monkeypatch.setattr("turnstone.server.WebUI", _FakeUI)

    def _factory(ui: Any, _model: Any, ws_id: str, **_kw: Any) -> _FakeSession:
        uid = getattr(ui, "_user_id", "")
        return _FakeSession(ws_id=ws_id, user_id=uid)

    gq: queue.Queue[dict[str, Any]] = queue.Queue(maxsize=1000)
    WebUI._global_queue = gq
    adapter = InteractiveAdapter(
        global_queue=gq,
        ui_factory=lambda ws: _FakeUI(
            ws_id=ws.id,
            user_id=ws.user_id,
        ),
        session_factory=_factory,
    )
    mgr = SessionManager(
        adapter, storage=get_storage(), max_active=10, node_id="node-test", event_emitter=adapter
    )
    app = create_app(
        workstreams=mgr,
        global_queue=gq,
        global_listeners=[],
        global_listeners_lock=threading.Lock(),
        skip_permissions=False,
        jwt_secret=_TEST_JWT_SECRET,
        auth_storage=get_storage(),
    )
    client = TestClient(app, raise_server_exceptions=False)
    try:
        yield client, mgr
    finally:
        client.close()
        reset_storage()


# ---------------------------------------------------------------------------
# PR #1 HTTP-boundary kind validation (q-4) — previously untested
# ---------------------------------------------------------------------------


class TestKindValidationOnCreate:
    """POST /v1/api/workstreams/new — kind field validation at the HTTP edge."""

    def test_rejects_kind_coordinator(self, app_client):
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"kind": "coordinator", "name": "x"},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 400
        assert "coordinator" in resp.json()["error"].lower()

    def test_rejects_unknown_kind(self, app_client):
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"kind": "interative", "name": "x"},  # typo
            headers=_auth("user-1"),
        )
        assert resp.status_code == 400
        assert "unknown" in resp.json()["error"].lower()

    def test_accepts_default_kind(self, app_client):
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "x"},  # kind omitted
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200

    def test_rejects_cross_tenant_parent_ws_id(self, app_client, tmp_path):
        """parent_ws_id pointing at another user's coordinator → 403."""
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        # Victim creates a coordinator directly in storage (console path).
        storage.register_workstream(
            "victim-coord",
            node_id="console",
            name="victim",
            kind="coordinator",
            user_id="victim-user",
        )
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "attacker", "parent_ws_id": "victim-coord"},
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 403
        assert "coordinator you own" in resp.json()["error"]

    def test_rejects_creating_parent_ws_id(self, app_client):
        """A child cannot attach to a coordinator before lifecycle birth."""
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        assert storage.register_workstream(
            "pending-coord",
            node_id="console",
            name="pending",
            state="creating",
            kind="coordinator",
            user_id="user-1",
        )

        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "too-early", "parent_ws_id": "pending-coord"},
            headers=_auth("user-1"),
        )

        assert resp.status_code == 400
        assert "known workstream" in resp.json()["error"]
        assert mgr.count == 0


class TestAutoApproveToolsOnCreate:
    """The mounted node handler applies CSV/list per-tool approval policy."""

    @pytest.mark.parametrize(
        "raw_tools",
        [
            " read_file,write_file,read_file,, ",
            [" read_file ", "write_file", "read_file", ""],
        ],
    )
    def test_accepts_canonicalizes_and_tags_tools_with_blanket_off(
        self,
        app_client: Any,
        raw_tools: Any,
    ) -> None:
        from turnstone.core.session_ui_base import AutoApproveReason

        client, mgr = app_client
        response = client.post(
            "/v1/api/workstreams/new",
            json={"name": "per-tool", "auto_approve_tools": raw_tools},
            headers=_auth("user-1"),
        )

        assert response.status_code == 200, response.text
        ws = mgr.get(response.json()["ws_id"])
        assert ws is not None
        assert ws.ui.auto_approve is False
        assert ws.ui.auto_approve_tools == {"read_file", "write_file"}
        assert ws.ui._auto_approve_tools_source == {
            "read_file": AutoApproveReason.AUTO_APPROVE_TOOLS,
            "write_file": AutoApproveReason.AUTO_APPROVE_TOOLS,
        }

    @pytest.mark.parametrize(
        ("raw_tools", "error"),
        [
            ({"read_file": True}, "comma-separated string or array"),
            (["read_file", 7], "auto_approve_tools[1] must be a string"),
        ],
    )
    def test_rejects_malformed_tools_before_create(
        self,
        app_client: Any,
        raw_tools: Any,
        error: str,
    ) -> None:
        client, mgr = app_client

        response = client.post(
            "/v1/api/workstreams/new",
            json={"auto_approve_tools": raw_tools},
            headers=_auth("user-1"),
        )

        assert response.status_code == 400
        assert error in response.json()["error"]
        assert mgr.count == 0

    def test_schema_exposes_live_create_fields(self) -> None:
        from turnstone.api.server_schemas import CreateWorkstreamRequest

        request = CreateWorkstreamRequest(
            auto_approve_tools=["read_file"],
            judge_model="judge-fast",
            user_id="forwarded-user",
        )

        assert request.auto_approve_tools == ["read_file"]
        assert request.judge_model == "judge-fast"
        assert request.user_id == "forwarded-user"


class TestMountedCreateUserIdOverride:
    """The real interactive mount trusts only the console service identity."""

    @staticmethod
    def _service_headers(*, include_service_scope: bool) -> dict[str, str]:
        from turnstone.core.auth import JWT_AUD_SERVER, create_jwt

        scopes = {"read", "write", "approve"}
        if include_service_scope:
            scopes.add("service")
        token = create_jwt(
            user_id="console-service",
            scopes=frozenset(scopes),
            source="console",
            secret=_TEST_JWT_SECRET,
            audience=JWT_AUD_SERVER,
            permissions=frozenset({"workstreams.create"}),
        )
        return {"Authorization": f"Bearer {token}"}

    def test_ordinary_caller_cannot_override_owner(self, app_client: Any) -> None:
        client, mgr = app_client
        response = client.post(
            "/v1/api/workstreams/new",
            json={"name": "ordinary", "user_id": "impersonated"},
            headers=_auth("ordinary-user"),
        )

        assert response.status_code == 200, response.text
        ws = mgr.get(response.json()["ws_id"])
        assert ws is not None
        assert ws.user_id == "ordinary-user"

    def test_console_without_service_scope_cannot_override_owner(self, app_client: Any) -> None:
        client, mgr = app_client
        response = client.post(
            "/v1/api/workstreams/new",
            json={"name": "unscoped-console", "user_id": "impersonated"},
            headers=self._service_headers(include_service_scope=False),
        )

        assert response.status_code == 200, response.text
        ws = mgr.get(response.json()["ws_id"])
        assert ws is not None
        assert ws.user_id == "console-service"

    def test_console_service_can_forward_owner(self, app_client: Any) -> None:
        client, mgr = app_client
        response = client.post(
            "/v1/api/workstreams/new",
            json={"name": "trusted-console", "user_id": "forwarded-user"},
            headers=self._service_headers(include_service_scope=True),
        )

        assert response.status_code == 200, response.text
        ws = mgr.get(response.json()["ws_id"])
        assert ws is not None
        assert ws.user_id == "forwarded-user"


class TestOpenKindGate:
    """POST /v1/api/workstreams/{ws_id}/open refuses coordinator rows.

    Post-lift behavior change: the lifted ``open`` body delegates the
    kind check to ``SessionManager.open()`` (which returns ``None``
    for kind mismatch / missing row / tombstone — all the
    "manager has no such ws_id" cases). The pre-lift handler had a
    separate pre-mgr storage probe that returned a kind-specific
    400 ("Workstream is not an interactive kind"); the lift
    consolidates on a single 404 ("Workstream not found"). Security
    boundary unchanged — caller still can't open a coord row from
    the interactive node — but the error code + message converge
    with the rest of the not-found paths.
    """

    def test_refuses_to_open_coordinator(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        storage.register_workstream(
            "coord-1",
            node_id="console",
            name="c",
            kind="coordinator",
            user_id="user-1",
        )
        resp = client.post(
            "/v1/api/workstreams/coord-1/open",
            headers=_auth("user-1"),
        )
        assert resp.status_code == 404
        assert "not found" in resp.json()["error"].lower()


# ---------------------------------------------------------------------------
# PR #2 authz cluster — cross-tenant gates on interactive-ws mutations
# ---------------------------------------------------------------------------


def _register_ws(storage: Any, ws_id: str, owner: str) -> None:
    storage.register_workstream(ws_id, node_id="node-test", name=ws_id, user_id=owner)


class TestCrossTenantDelete:
    def test_any_caller_can_delete(self, app_client):
        # Trusted-team model: scope auth gates the endpoint, not
        # row-level ownership.  ``user_id`` stays on audit + storage
        # metadata.
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/delete",
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 200

    def test_owner_delete_records_audit(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-own", "user-1")
        resp = client.post(
            "/v1/api/workstreams/ws-own/delete",
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        events = storage.list_audit_events(action="workstream.deleted")
        assert any(e["resource_id"] == "ws-own" for e in events)


class TestCrossTenantApprove:
    def test_non_owner_cannot_approve(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/approve",
            json={"approved": True},
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 404


class TestCrossTenantClose:
    def test_non_owner_cannot_close(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/close",
            json={},
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 404


class TestPermissionGatesOnLifecycle:
    """Gates that previously didn't exist — ``workstreams.create``,
    ``workstreams.close``, ``tools.approve`` were declared, seeded into
    builtin-operator, surfaced in the admin Roles UI, and never wired
    to a single ``require_permission`` site. PR added the gates; these
    tests confirm a JWT without each perm gets 403."""

    def test_create_without_perm_returns_403(self, app_client):
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "no-perm"},
            headers=_auth("user-1", permissions=frozenset()),
        )
        assert resp.status_code == 403
        assert "workstreams.create" in resp.json()["error"]

    def test_close_without_perm_returns_403(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-1", "user-1")
        resp = client.post(
            "/v1/api/workstreams/ws-1/close",
            json={},
            headers=_auth("user-1", permissions=frozenset()),
        )
        assert resp.status_code == 403
        assert "workstreams.close" in resp.json()["error"]

    def test_approve_without_perm_returns_403(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-1", "user-1")
        resp = client.post(
            "/v1/api/workstreams/ws-1/approve",
            json={"approved": True},
            headers=_auth("user-1", permissions=frozenset()),
        )
        assert resp.status_code == 403
        assert "tools.approve" in resp.json()["error"]

    def test_create_with_perm_passes_gate(self, app_client):
        # Sanity: same call WITH the perm reaches the post-gate logic
        # (whatever its outcome — a successful create or a non-403
        # validation/state error is fine; only the gate behaviour is
        # under test here).
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "with-perm"},
            headers=_auth("user-1", permissions=frozenset({"workstreams.create"})),
        )
        assert resp.status_code != 403, resp.json()

    # Positive coverage for the admin.coordinator OR-fallback on each
    # of the three lifted verbs.  Without these, a future refactor
    # that dropped admin.coordinator from the accepted_permissions
    # tuple would regress coord-session children silently — the proxy
    # tests only exercise the route_proxy verb dict, not the lift.

    def test_create_with_admin_coordinator_passes_gate(self, app_client):
        client, _mgr = app_client
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "coord-child"},
            headers=_auth("user-1", permissions=frozenset({"admin.coordinator"})),
        )
        assert resp.status_code != 403, resp.json()

    def test_close_with_admin_coordinator_passes_gate(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-1", "user-1")
        resp = client.post(
            "/v1/api/workstreams/ws-1/close",
            json={},
            headers=_auth("user-1", permissions=frozenset({"admin.coordinator"})),
        )
        assert resp.status_code != 403, resp.json()

    def test_approve_with_admin_coordinator_passes_gate(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-1", "user-1")
        resp = client.post(
            "/v1/api/workstreams/ws-1/approve",
            json={"approved": True},
            headers=_auth("user-1", permissions=frozenset({"admin.coordinator"})),
        )
        assert resp.status_code != 403, resp.json()


class TestCrossTenantTitle:
    def test_refresh_title_requires_live_session(self, app_client):
        # Trusted-team model: scope-level auth is the gate; any caller
        # can hit the endpoint.  A not-currently-active workstream
        # still 404s because the refresh needs the live session, not
        # because of tenant mismatch.
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/refresh-title",
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 404
        assert "not active" in resp.json().get("error", "") or "not found" in resp.json().get(
            "error", ""
        )

    def test_any_caller_can_set_title(self, app_client):
        # Trusted-team model: title is editable by any authenticated
        # caller; ``user_id`` remains metadata.
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/title",
            json={"title": "updated title"},
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 200


class TestCrossTenantOpen:
    def test_any_caller_can_open_persisted(self, app_client):
        # Trusted-team model: open is gated on scope auth, not on row
        # ownership.  The persisted ``user_id`` stays as metadata.
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.post(
            "/v1/api/workstreams/ws-victim/open",
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 200


class TestListWorkstreamsTrustedTeamVisibility:
    """Listing endpoints (/workstreams, /dashboard, /workstreams/saved)
    return the cluster-wide set to any authenticated caller.  Mutations
    are gated independently on the per-workstream handlers — see
    TestCrossTenant{Delete,Approve,Close,Title,Open} for those gates."""

    def test_list_returns_all_owners(self, app_client):
        client, _mgr = app_client
        resp_a = client.post(
            "/v1/api/workstreams/new",
            json={"name": "a"},
            headers=_auth("user-a"),
        )
        resp_b = client.post(
            "/v1/api/workstreams/new",
            json={"name": "b"},
            headers=_auth("user-b"),
        )
        assert resp_a.status_code == 200 and resp_b.status_code == 200
        ws_a, ws_b = resp_a.json()["ws_id"], resp_b.json()["ws_id"]

        # user-a now sees both.
        resp = client.get("/v1/api/workstreams", headers=_auth("user-a"))
        assert resp.status_code == 200
        # Row key renamed id → ws_id in the Stage 2 list-verb lift.
        ids = {w["ws_id"] for w in resp.json()["workstreams"]}
        assert {ws_a, ws_b}.issubset(ids), ids

    def test_active_list_row_shape_includes_unified_fields(self, app_client):
        """Stage 2 list-verb-lift parity regression — interactive
        active-list row carries the always-include fields (ws_id,
        name, state, kind, parent_ws_id, user_id) that the lifted
        ``make_list_handler`` produces on every kind. Mirrors the
        coord-side ``test_active_list_row_shape_includes_unified_fields``
        in ``test_coordinator_endpoints.py`` so a future regression
        that drops a field on either branch is caught."""
        client, _mgr = app_client
        create_resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "shape-check"},
            headers=_auth("user-shape"),
        )
        assert create_resp.status_code == 200
        ws_id = create_resp.json()["ws_id"]

        resp = client.get("/v1/api/workstreams", headers=_auth("user-shape"))
        assert resp.status_code == 200
        body = resp.json()
        assert "workstreams" in body
        rows = [w for w in body["workstreams"] if w["ws_id"] == ws_id]
        assert len(rows) == 1
        row = rows[0]
        # Always-include row shape — interactive populates kind=
        # INTERACTIVE; user_id is post-lift parity (was coord-only).
        assert set(row.keys()) == {
            "ws_id",
            "name",
            "state",
            "kind",
            "parent_ws_id",
            "user_id",
            "project_id",
            "persona",
            "persistence_state",
        }
        assert row["kind"] == "interactive"
        assert row["user_id"] == "user-shape"
        assert row["persistence_state"] == "healthy"
        # parent_ws_id is None for top-level interactive workstreams
        # (only coord-spawned children carry it).
        assert row["parent_ws_id"] is None


class TestDashboardTrustedTeamVisibility:
    def test_dashboard_aggregate_includes_all_owners(self, app_client):
        client, _mgr = app_client
        client.post("/v1/api/workstreams/new", json={"name": "a"}, headers=_auth("user-a"))
        client.post("/v1/api/workstreams/new", json={"name": "b"}, headers=_auth("user-b"))
        client.post("/v1/api/workstreams/new", json={"name": "b2"}, headers=_auth("user-b"))

        resp = client.get("/v1/api/dashboard", headers=_auth("user-b"))
        assert resp.status_code == 200
        data = resp.json()
        # All three workstreams visible regardless of caller identity.
        assert data["aggregate"]["total_count"] == 3
        owners = {w["user_id"] for w in data["workstreams"]}
        assert {"user-a", "user-b"}.issubset(owners)

    def test_dashboard_pending_approval_details_default_empty(self, app_client):
        """No pending approval → the list field is explicitly empty on
        the wire so consumers can distinguish "nothing pending" from
        "absent key".  Replaces 1.6's singular ``pending_approval_detail``
        null (breaking, 1.7)."""
        client, _mgr = app_client
        client.post("/v1/api/workstreams/new", json={"name": "a"}, headers=_auth("user-a"))
        resp = client.get("/v1/api/dashboard", headers=_auth("user-a"))
        assert resp.status_code == 200
        rows = resp.json()["workstreams"]
        assert len(rows) == 1
        assert "pending_approval_details" in rows[0]
        assert rows[0]["pending_approval_details"] == []
        # The 1.6 singular field is GONE, not null — a consumer still
        # reading it should break loudly, not read None forever.
        assert "pending_approval_detail" not in rows[0]

    def test_dashboard_projects_only_sanitized_persistence_state(self, app_client):
        client, mgr = app_client
        created = client.post(
            "/v1/api/workstreams/new",
            json={"name": "needs-history-repair"},
            headers=_auth("user-a"),
        )
        ws = mgr.get(created.json()["ws_id"])
        ws.session.conversation_persistence_status = lambda: {
            "state": "retrying",
            "attempts": 2,
            "last_failure_at": "not-public",
        }

        row = client.get("/v1/api/dashboard", headers=_auth("user-a")).json()["workstreams"][0]

        assert row["persistence_state"] == "retrying"
        assert "attempts" not in row
        assert "last_failure_at" not in row

    def test_dashboard_pending_approval_details_merge_judge_verdict(self, app_client):
        """When _pending_approval is set on a ws's UI, /dashboard
        embeds one detail entry per live cycle with merged items +
        judge_verdict so coord live-bulk callers can render inline
        approve/deny buttons."""
        client, mgr = app_client
        client.post("/v1/api/workstreams/new", json={"name": "a"}, headers=_auth("user-a"))
        ws_id = next(iter(mgr.list_all())).id
        ui = mgr.get(ws_id).ui
        ui._pending_approval = {
            "type": "approve_request",
            "cycle_id": "cyc-1",
            "items": [
                {
                    "call_id": "c-1",
                    "header": "bash",
                    "preview": "$ ls",
                    "func_name": "bash",
                    "approval_label": "bash",
                    "needs_approval": True,
                }
            ],
            "judge_pending": False,
        }
        ui._llm_verdicts["c-1"] = {
            "recommendation": "deny",
            "risk_level": "crit",
            "confidence": 0.93,
            "tier": "llm",
        }
        resp = client.get("/v1/api/dashboard", headers=_auth("user-a"))
        assert resp.status_code == 200
        row = next(w for w in resp.json()["workstreams"] if w["ws_id"] == ws_id)
        details = row["pending_approval_details"]
        assert len(details) == 1
        detail = details[0]
        assert detail["cycle_id"] == "cyc-1"
        assert detail["call_id"] == "c-1"
        assert detail["judge_pending"] is False
        item = detail["items"][0]
        assert item["func_name"] == "bash"
        assert item["judge_verdict"]["recommendation"] == "deny"
        assert item["judge_verdict"]["risk_level"] == "crit"


class TestSavedWorkstreamsTrustedTeamVisibility:
    """Listing returns the cluster-wide set across all owners.  Resuming
    an owned saved workstream goes through the per-workstream ownership
    gate on /open (see TestCrossTenantOpen); ownerless persisted rows
    are claimable by any authenticated caller via /open, consistent
    with the same trusted-team model."""

    def _seed(self, client):
        """Create two workstreams per user, each with a message so they
        land in list_workstreams_with_history (the SQL gates on an
        EXISTS conversation)."""
        from turnstone.core.storage import get_storage

        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "alice-saved", "alice")
        storage.save_message("alice-saved", "user", "alice's plan")
        _register_ws(storage, "bob-saved", "bob")
        storage.save_message("bob-saved", "user", "bob's plan")
        return storage

    def test_any_caller_sees_all_rows(self, app_client):
        client, _mgr = app_client
        self._seed(client)
        resp = client.get("/v1/api/workstreams/saved", headers=_auth("alice"))
        assert resp.status_code == 200
        ids = {r["ws_id"] for r in resp.json()["workstreams"]}
        assert {"alice-saved", "bob-saved"}.issubset(ids), ids

    def test_service_scope_sees_all_rows(self, app_client):
        """Service-scope still works — same set, different auth path."""
        client, _mgr = app_client
        self._seed(client)
        resp = client.get(
            "/v1/api/workstreams/saved",
            headers=_auth("cluster-collector", scopes=frozenset({"read", "service"})),
        )
        assert resp.status_code == 200
        ids = {r["ws_id"] for r in resp.json()["workstreams"]}
        assert {"alice-saved", "bob-saved"}.issubset(ids)

    def test_enriched_fields_in_response(self, app_client):
        """Saved-list rows carry the enrichment fields, incl. the
        Python-computed context_ratio (latest usage prompt_tokens / model
        context window)."""
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "rich-ws", "alice")
        storage.save_message("rich-ws", "user", "do a thing")
        storage.save_workstream_config("rich-ws", {"model_alias": "m1", "skill": "news"})
        storage.record_usage_event("ev-rich", ws_id="rich-ws", prompt_tokens=500)
        storage.create_model_definition(
            "def-rich", alias="m1", model="m1-model", context_window=1000
        )

        resp = client.get("/v1/api/workstreams/saved", headers=_auth("alice"))
        assert resp.status_code == 200
        row = next(r for r in resp.json()["workstreams"] if r["ws_id"] == "rich-ws")
        assert row["model_alias"] == "m1"
        assert row["launch_skill"] == "news"
        assert row["context_tokens"] == 500
        assert row["context_ratio"] == 0.5  # 500 / 1000
        assert row["child_count"] == 0

    def test_context_ratio_zero_when_window_unknown(self, app_client):
        """A model_alias absent from model_definitions (e.g. config.toml-only)
        leaves context_window NULL → context_ratio degrades to 0.0 instead of
        erroring on the division."""
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "no-window-ws", "alice")
        storage.save_message("no-window-ws", "user", "hi")
        storage.save_workstream_config("no-window-ws", {"model_alias": "toml-only"})
        storage.record_usage_event("ev-now", ws_id="no-window-ws", prompt_tokens=500)

        resp = client.get("/v1/api/workstreams/saved", headers=_auth("alice"))
        assert resp.status_code == 200
        row = next(r for r in resp.json()["workstreams"] if r["ws_id"] == "no-window-ws")
        assert row["context_tokens"] == 500
        assert row["context_ratio"] == 0.0
        assert row["model_alias"] == "toml-only"

    def test_orphan_rows_visible(self, app_client):
        """Ownerless rows (empty user_id from migrations / startup
        ``name="default"``) appear in the cluster-wide listing alongside
        owned rows.  /open lets any authenticated caller claim them —
        intentional under the trusted-team model — so the listing isn't
        leaking anything the resume path wouldn't already grant."""
        client, _mgr = app_client
        storage = self._seed(client)
        _register_ws(storage, "orphan-saved", "")
        storage.save_message("orphan-saved", "user", "orphan content")
        resp = client.get(
            "/v1/api/workstreams/saved",
            headers=_auth("alice", scopes=frozenset({"read"})),
        )
        assert resp.status_code == 200
        ids = {r["ws_id"] for r in resp.json()["workstreams"]}
        assert "orphan-saved" in ids

    def test_coordinator_rows_excluded_even_for_service(self, app_client):
        """kind filter is orthogonal to the user_id filter — even a
        service caller (cluster-wide) must not see coordinator rows on
        the interactive 'saved workstreams' endpoint."""
        from turnstone.core.storage import get_storage
        from turnstone.core.workstream import WorkstreamKind

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        storage.register_workstream(
            "coord-row",
            node_id="console",
            user_id="alice",
            name="alice-coord",
            kind=WorkstreamKind.COORDINATOR,
            parent_ws_id=None,
        )
        storage.save_message("coord-row", "user", "planning")
        _register_ws(storage, "alice-interactive", "alice")
        storage.save_message("alice-interactive", "user", "interactive")

        resp = client.get(
            "/v1/api/workstreams/saved",
            headers=_auth("alice", scopes=frozenset({"read", "service"})),
        )
        assert resp.status_code == 200
        ids = {r["ws_id"] for r in resp.json()["workstreams"]}
        assert "alice-interactive" in ids
        assert "coord-row" not in ids


class TestGlobalEventsServiceGate:
    def test_non_service_rejected(self, app_client):
        client, _mgr = app_client
        resp = client.get(
            "/v1/api/events/global",
            headers=_auth("user-a"),  # no service scope
        )
        assert resp.status_code == 403
        assert "service" in resp.json()["error"].lower()

    def test_service_scope_accepted(self, app_client):
        """Regression for the console-collector 403 footgun: the
        collector's ServiceTokenManager is configured in console/server.py
        with scopes ``{"read", "service"}``.  This gate must accept
        exactly that scope set so the collector's SSE subscription
        doesn't silently 403 out (#sev-0).  Any future scope renaming
        that would drop ``"service"`` from the node-side check breaks
        this test before it breaks the dashboard.

        Probe a deliberately-wrong ``expected_node_id`` — the handler
        runs the scope gate first, then the node-identity check.  A
        409 response proves we made it past the scope gate (which is
        what this test is asserting), while also avoiding an
        indefinitely-open SSE stream the TestClient would never close.
        """
        client, _mgr = app_client
        # Exact scope set the collector uses today.
        collector_scopes = frozenset({"read", "service"})
        resp = client.get(
            "/v1/api/events/global?expected_node_id=definitely-wrong-node-id",
            headers=_auth("console-collector", scopes=collector_scopes),
        )
        # 409 = the scope gate passed and we hit the node-identity
        # mismatch branch.  Anything else (403 / 500 / 200 stream)
        # is a failure for this contract.
        assert resp.status_code == 409, (
            f"service-scoped token did not reach node-id check: "
            f"{resp.status_code} {resp.text[:120]}"
        )


class TestPerWsSseGate:
    def test_non_owner_rejected(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        _register_ws(storage, "ws-victim", "victim-user")
        resp = client.get(
            "/v1/api/workstreams/ws-victim/events?user_turn=1",
            headers=_auth("attacker-user"),
        )
        assert resp.status_code == 404
        assert "user_turn" not in resp.text
        assert "projection" not in resp.text


# ---------------------------------------------------------------------------
# Audit events on successful mutations (sec-11)
# ---------------------------------------------------------------------------


class TestAuditEventsOnMutations:
    def test_workstream_created_emits_audit(self, app_client):
        from turnstone.core.storage import get_storage

        client, _mgr = app_client
        storage = get_storage()
        assert storage is not None
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "auditme"},
            headers=_auth("user-audit"),
        )
        assert resp.status_code == 200
        ws_id = resp.json()["ws_id"]
        events = storage.list_audit_events(action="workstream.created")
        matching = [e for e in events if e["resource_id"] == ws_id]
        assert matching, "audit row absent for newly created workstream"
        detail = json.loads(matching[0]["detail"])
        assert detail["kind"] == "interactive"


class TestInteractiveCancelLifted:
    """HTTP-level coverage for the post-lift interactive ``cancel``
    handler at ``POST /v1/api/workstreams/{ws_id}/cancel``. The lifted
    ``make_cancel_handler`` body is shared with coord. Pre-lift
    ``cancel_generation`` was untested at the HTTP layer; coord
    exercised the lifted body via ``test_coordinator_endpoints.py``.
    This class adds the missing interactive-side parity."""

    def _create_ws(self, client) -> str:
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "cancel-target"},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        return resp.json()["ws_id"]

    def test_cancel_returns_dropped_shape(self, app_client):
        """Always-include shape: response carries ``dropped`` (the
        forensic snapshot) regardless of whether anything was running."""
        client, _mgr = app_client
        ws_id = self._create_ws(client)
        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        body = resp.json()
        assert body["status"] == "ok"
        assert "dropped" in body
        assert body["dropped"]["was_running"] is False

    def test_cancel_force_clears_worker_thread_and_running_flag(self, app_client):
        """Force-cancel parity with coord: clears ``worker_thread`` AND
        ``_worker_running`` so a follow-up send doesn't route through
        ``enqueue()`` to the abandoned worker's queue (bug-2 from the
        cancel-lift /review). Mirrors
        ``test_cancel_force_flag_abandons_worker_thread_and_emits_stream_end``
        on the coord side."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        # Simulate an in-flight worker the lifted cancel needs to
        # abandon. The fake session's cancel() is a no-op, so the
        # cancel flag side-effect doesn't matter — what matters is
        # the (worker_thread, _worker_running) pair after force-cancel.
        ws._worker_running = True
        ws.worker_thread = threading.Thread(target=lambda: None, daemon=True)

        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={"force": True},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        # Both fields cleared together — invariant from session_worker
        # ("readers gating on either flag see a coherent
        # (worker_thread, _worker_running) pair").
        assert ws.worker_thread is None
        assert ws._worker_running is False

    def test_force_cancel_never_abandons_successor_that_replaces_pinned_target(
        self,
        app_client,
    ):
        """A exits and B spawns after Stop starts but before force cleanup."""

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None and ws.session is not None and ws.ui is not None
        predecessor = threading.Thread(target=lambda: None, name="cancel-target-a")
        successor = threading.Thread(target=lambda: None, name="fresh-successor-b")
        with ws._lock:
            ws._worker_running = True
            ws.worker_thread = predecessor
            ws._worker_principal_id = "alice"

        def _cancel_and_replace_target() -> None:
            # Deterministically occupy the exact window between the handler's
            # target snapshot and its later force-ownership decision.
            with ws._lock:
                assert ws.worker_thread is predecessor
                ws._worker_running = False
                ws.worker_thread = None
                ws._worker_principal_id = ""
                ws._worker_running = True
                ws.worker_thread = successor
                ws._worker_principal_id = "bob"

        ws.session.cancel = _cancel_and_replace_target  # type: ignore[method-assign]
        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={"force": True},
            headers=_auth("user-1"),
        )

        assert resp.status_code == 200
        assert ws.worker_thread is successor
        assert ws._worker_running is True
        assert ws._worker_principal_id == "bob"
        event_types = [event.get("type") for event in ws.ui._enqueued]
        assert "cancelled" in event_types
        assert "stream_end" not in event_types
        assert "idle" not in ws.ui.states

    def test_cancel_returns_400_when_session_missing(self, app_client):
        """Parity with coord: a placeholder workstream (session=None)
        gets a 400 ``"No session"`` rather than a silent no-op 200.
        Pre-lift interactive already returned 400 here; the lift
        preserves the behaviour and propagates it to coord."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        ws.session = None  # force the build-failed shape

        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 400
        assert resp.json()["error"] == "No session"


from tests._replay_helpers import make_replay_mocks as _make_interactive_replay_mocks  # noqa: E402


class TestInteractiveEventsLifted:
    """Unit + HTTP coverage for the lifted ``events`` SSE handler.

    Substantive coverage targets the ``_interactive_events_replay``
    callback (the kind-specific initial-replay generator the lifted
    body iterates before the live loop) and the legacy URL shim.
    The live SSE loop itself (``ws_closed`` exit + ``is_disconnected``
    check) is hard to assert against ``TestClient`` because each
    event arrives as a separate ``data:`` line and the stream runs
    forever; the loop is the same shape used by every other lifted
    SSE-shaped path (cancel / close / open / send), so a regression
    in the loop body would surface across many test files. Live-loop
    smoke coverage is a deferred follow-up tracked in
    ``1.5.0-stable-handoff.md``'s "Risk flags for the next session"
    section.
    """

    def test_shared_preamble_yields_connected_first(self):
        """The shared handler's preamble preserves connected-event shape."""
        from turnstone.core.session_replay import session_replay_preamble

        ws, ui, request = _make_interactive_replay_mocks()
        out = list(session_replay_preamble(ws.session, ui, project_name="Visible Project"))
        assert out[0]["type"] == "connected"
        assert out[0]["model"] == "gpt-5"
        assert out[0]["model_alias"] == "default"
        assert out[0]["project_name"] == "Visible Project"
        assert out[0]["skip_permissions"] is False

    def test_shared_preamble_includes_status_only_when_last_usage_present(self):
        """The ``status`` event populates the per-tab token-usage
        bar on resume. Skipped when ``session._last_usage`` is None
        (a freshly-created workstream that hasn't completed a turn)."""
        from turnstone.core.session_replay import session_replay_preamble

        ws, ui, _request = _make_interactive_replay_mocks()
        out = list(session_replay_preamble(ws.session, ui))
        assert "status" not in {ev["type"] for ev in out}

    def test_events_replay_yields_pending_approval_then_verdicts(self):
        """When an approval is pending, the order is approval +
        cached verdicts (so the client renders the prompt and then
        the LLM-judge intent verdicts that fired during it). Pre-lift
        ordering preserved."""
        from turnstone.server import _interactive_events_replay

        ws, ui, request = _make_interactive_replay_mocks(
            _pending_approval={"type": "approve_request", "items": []},
            _llm_verdicts={"v1": {"verdict_id": "v1", "tier": "judge"}},
        )

        out = list(_interactive_events_replay(ws, ui, request))
        types = [ev["type"] for ev in out]
        # The approve_request, then the intent_verdict.
        approve_idx = types.index("approve_request")
        verdict_idx = types.index("intent_verdict")
        assert approve_idx < verdict_idx

    def test_events_replay_skips_when_session_missing(self):
        """Defensive: a placeholder workstream whose session is
        ``None`` (close-then-reopen race) yields an empty replay
        rather than NPE'ing on ``session.model``. The lifted body
        already 409s for missing UI; this guards the rare case
        where UI exists but session was detached."""
        from turnstone.server import _interactive_events_replay

        ws = MagicMock()
        ws.session = None
        ui = MagicMock()
        request = MagicMock()
        out = list(_interactive_events_replay(ws, ui, request))
        assert out == []

    def test_events_replay_omits_conversation_history(self):
        """PR A: conversation history is no longer replayed over SSE.
        The frontend fetches it via ``GET /history`` (REST) on page
        load and re-fetches on ``clear_ui``; the replay must not yield a
        ``history`` event (which previously shipped a multi-MB message
        list on every (re)connect)."""
        from turnstone.server import _interactive_events_replay

        ws, ui, request = _make_interactive_replay_mocks(
            _pending_approval={"type": "approve_request", "items": []},
        )
        out = list(_interactive_events_replay(ws, ui, request))
        assert "history" not in {ev["type"] for ev in out}

    def test_events_path_keyed_url_resolves_to_404_for_unknown_ws(self, app_client):
        """``GET /v1/api/workstreams/{ws_id}/events`` returns 404 for an
        unknown ws_id. Pre-1.5 the same intent was tested against
        ``GET /api/events?ws_id=...`` via the legacy query-keyed
        adapter; that URL family was removed in 1.5 along with the
        adapter."""
        client, _mgr = app_client
        resp = client.get(
            "/v1/api/workstreams/does-not-exist/events",
            headers=_auth("user-1"),
        )
        assert resp.status_code == 404


# ---------------------------------------------------------------------------
# POST /v1/api/command — /compact worker dispatch (progress-events fix)
# ---------------------------------------------------------------------------


def test_command_backstop_sits_under_console_proxy_timeout() -> None:
    """The /command ``running`` answer only ever traverses a proxied pane
    while the node-side completion backstop is STRICTLY under the console
    proxy's client timeout — two constants in two processes whose
    inequality used to live in a comment.  This is the enforcement: edit
    either constant past the other and this fails before a proxied
    deployment silently loses the degraded answer again."""
    from turnstone.console.server import _PROXY_CLIENT_TIMEOUT_S
    from turnstone.server import _COMMAND_RESPONSE_BACKSTOP_S

    assert _COMMAND_RESPONSE_BACKSTOP_S < _PROXY_CLIENT_TIMEOUT_S


class TestCompactCommandDispatch:
    """Manual /compact runs on the workstream's worker slot: the event loop
    stays free to stream the compaction progress events, and a concurrent
    send takes the queue path instead of racing the history swap."""

    def _create_ws(self, client) -> str:
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "compact-me"},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        return resp.json()["ws_id"]

    def test_compact_dispatches_to_worker(self, app_client):
        client, mgr = app_client
        ws_id = self._create_ws(client)
        resp = client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        assert resp.json() == {"status": "ok"}

        ws = mgr.get(ws_id)
        assert ws is not None
        # The compaction runs on the spawned worker — join it (the runner
        # clears _worker_running before the thread exits, so the join
        # subsumes the flag).
        ws.worker_thread.join(timeout=5)
        assert not ws.worker_thread.is_alive()
        assert ws.session.compacts == 1
        assert ws.session.compact_principals == ["user-1"]
        assert ws._worker_running is False
        # The slot was classified as a command window (what the /send
        # route's defer keys on; stale after exit is harmless — every
        # reader conjoins _worker_running).
        assert ws.worker_kind == "command"
        # Exit seam: stranded-text backstop flush only — no drain, no
        # answering send (sends during the window defer in the /send
        # route and dispatch as their own workers afterwards).
        assert ws.session.queued_flushes == 1
        assert ws.session.sends == []
        # The worker wrapped the run in busy/idle state transitions.
        assert ws.ui.states == ["thinking", "idle"]

    # Drain outcomes are polled with tests._helpers.wait_until (flake-
    # hardened final re-check; raises instead of returning False) at
    # timeout=8.0 — the drain thread runs at a 0.25s cadence, so dispatch
    # is asynchronous with respect to the released command worker and the
    # helper's 5s default is too tight for CI descheduling stalls.

    def _drain_idle(self, ws) -> bool:
        """True once the pending-send drain retired itself (list empty,
        single-flight slot cleared) — the leaked-task guard for these
        tests."""
        with ws._lock:
            return not ws._pending_sends and ws._pending_drain is None

    def test_send_during_compact_window_defers_then_dispatches_fully(self, app_client):
        """A /send during a manual /compact is answered "queued"
        IMMEDIATELY (no parked POST — a 30s-bounded caller like the
        coordinator client or console proxy must never lose a message to
        a multi-minute window) and then runs as an ordinary full-fidelity
        send — never the interjection queue, whose INTERJECTION_CAP_CHARS
        cap silently truncated pasted logs/code and whose cross-user guard
        locked second participants out for the whole compaction."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        resp = client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.json() == {"status": "ok"}
        big = "x" * 5000  # over the interjection cap — must survive intact
        # The response is immediate even though the window is wedged open:
        # this request runs on the same synchronous test client, so a
        # parked POST would deadlock the test rather than pass it.
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": big},
            headers=_auth("user-1"),
        )
        assert r.status_code == 200
        body = r.json()
        assert body["status"] == "queued"
        # The SDK-facing discriminator between "interjection-queued into a
        # live turn" and "parked on the deferred list" (SendResponse).
        assert body["deferred"] is True
        assert body["msg_id"]
        assert body["priority"] == "notice"
        # Registered, not dispatched: the window is still open.
        assert ws.session.sends == []
        assert ws.session.queue_calls == []  # the queue is unreachable
        with ws._lock:
            assert len(ws._pending_sends) == 1
        gate.set()  # compaction finishes; the drain dispatches
        wait_until(lambda: ws.session.sends, timeout=8.0)
        # Full fidelity: the exact 5000-char text, via a normal send (an
        # oversized entry must take the fresh-spawn arm — the interjection
        # fallback would truncate it).
        assert [s[0] for s in ws.session.sends] == [big]
        assert ws.session.queue_calls == []
        # The dispatched send carries the deferred msg_id as its send_id,
        # so the client's queued bubble reconciles against the turn.
        assert ws.session.sends[0][2] == body["msg_id"]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_cancelled_compact_flushes_queue_without_answering(self, app_client):
        """A user-stopped compaction must not auto-run a turn they may no
        longer want — queued text lands in the transcript via the flush
        drain instead (the cancel-seam precedent)."""
        from turnstone.core.session import GenerationCancelled

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        ws.session.compact_raises = GenerationCancelled()
        ws.session.queued_text = "queued mid-compact"
        resp = client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        ws.worker_thread.join(timeout=5)
        assert ws.session.compacts == 1
        assert ws.session.queued_flushes == 1
        assert ws.session.sends == []
        assert ws.ui.states == ["thinking", "idle"]

    def test_compact_refused_while_worker_running(self, app_client):
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        with ws._lock:
            ws._worker_running = True  # a turn is in flight
        try:
            resp = client.post(
                "/v1/api/command",
                json={"command": "/compact", "ws_id": ws_id},
                headers=_auth("user-1"),
            )
        finally:
            with ws._lock:
                ws._worker_running = False
        assert resp.status_code == 409  # loud refusal for status-code-only callers
        body = resp.json()
        assert body["status"] == "busy"
        assert "busy" in body["error"].lower()
        # Never ran inline, never queued a phantom compaction.
        assert ws.session.compacts == 0
        assert ws.session.commands == []

    def test_foreign_retained_queue_refuses_fresh_send_before_worker_spawn(self, app_client):
        """A persistence-retained interjection keeps its original owner.

        The foreign-owner check runs inside the atomic fresh-slot admission,
        but ``session_worker.send`` reports that refusal as ``False``.  The
        route must preserve the typed conflict outcome instead of falling
        through to its generic queue-full response, and no worker may bind or
        append the later participant's turn.
        """

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        ws.session.foreign_queue_principals.add("user-1")

        response = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "must wait for the retained owner"},
            headers=_auth("user-1"),
        )

        assert response.status_code == 409
        assert response.json()["status"] == "cross_user_interjection"
        assert ws.session.sends == []
        assert ws.session.queue_calls == []
        assert ws.worker_thread is None
        assert ws._worker_running is False

    def test_non_compact_commands_complete_before_response(self, app_client):
        """Quick commands dispatch through the same worker slot (mutual
        exclusion vs sends / a running compaction / each other) but the
        endpoint awaits completion, preserving the synchronous contract:
        handle_command has finished by the time the response returns."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        resp = client.post(
            "/v1/api/command",
            json={"command": "/skill", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        assert resp.json() == {"status": "ok"}
        ws = mgr.get(ws_id)
        # handle_command completed before the response (the done-Event
        # gates it); join before asserting the slot state (the runner
        # clears _worker_running before the thread exits, so the join
        # subsumes the flag; without it this assert races the worker's
        # last steps).
        assert ws.session.commands == ["/skill"]
        ws.worker_thread.join(timeout=5)
        assert not ws.worker_thread.is_alive()
        assert ws._worker_running is False
        # No exit seam work at all for quick commands: no drain, no flush,
        # no follow-up send, and no state chatter (they never left idle).
        assert ws.session.queued_flushes == 0
        assert ws.session.sends == []
        assert ws.ui.states == []

    def test_deferred_send_delivers_attachments_after_release(self, app_client, monkeypatch):
        """Attachments are peek-resolved BEFORE the defer (the bytes ride
        the pending entry), so a send deferred through a long compaction
        still delivers them on dispatch — the queue-path refusal
        (attachments_busy) must never apply to a command window."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None

        def fake_resolve(requested_ids, _ws_id, _user_id):
            assert list(requested_ids) == ["a1"]
            return (["fake-attachment-bytes"], ["a1"], [])

        monkeypatch.setattr("turnstone.core.attachments.resolve_staged_attachments", fake_resolve)
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "with attachment", "attachment_ids": ["a1"]},
            headers=_auth("user-1"),
        )
        body = r.json()
        assert body["status"] == "queued"
        # The attachments are TAKEN by the deferred entry (the client
        # consumes its chips off this list — a retract discards them).
        assert body["attached_ids"] == ["a1"]
        assert ws.session.sends == []  # still deferred
        gate.set()
        wait_until(lambda: ws.session.sends, timeout=8.0)
        text, attachments, sid = ws.session.sends[0]
        assert text == "with attachment"
        assert attachments == ["fake-attachment-bytes"]
        assert sid == body["msg_id"]
        assert ws.session.queue_calls == []
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_send_during_quick_command_window_defers(self, app_client):
        """The defer applies to EVERY command window, not just /compact —
        a send racing a quick command is answered "queued" and dispatches
        after the window with full fidelity instead of entering the
        interjection queue."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.command_gate = gate
        cmd_result: dict = {}

        def _cmd() -> None:
            r = client.post(
                "/v1/api/command",
                json={"command": "/skill", "ws_id": ws_id},
                headers=_auth("user-1"),
            )
            cmd_result["body"] = r.json()

        runner = threading.Thread(target=_cmd, daemon=True)
        runner.start()
        # Wait until the command worker actually holds the slot.
        wait_until(lambda: ws._worker_running, timeout=8.0)
        assert ws.worker_kind == "command"
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "mid-command send"},
            headers=_auth("user-1"),
        )
        send_body = r.json()
        assert send_body["status"] == "queued"
        assert ws.session.queue_calls == []
        assert ws.session.sends == []
        gate.set()
        runner.join(timeout=10)
        assert cmd_result["body"] == {"status": "ok"}
        wait_until(lambda: ws.session.sends, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["mid-command send"]
        assert ws.session.queue_calls == []
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_clear_ui_rides_the_worker_not_the_endpoint(self, app_client):
        """The clear_ui follow-up runs on the worker after handle_command —
        parked after the endpoint's 60s done-wait it was silently skipped
        for any command that outlived the backstop, leaving every pane
        rendering a transcript the server no longer holds."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        resp = client.post(
            "/v1/api/command",
            json={"command": "/clear", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        ws = mgr.get(ws_id)
        ws.worker_thread.join(timeout=5)
        assert {"type": "clear_ui"} in ws.ui._enqueued

    def _run_abandoned_command(self, client, mgr, ws_id, command="/clear", raises=None):
        """Dispatch a gated command, force-abandon its worker mid-run, then
        release the gate so the abandoned thread finishes late.  Returns
        (endpoint response body, the abandoned worker thread)."""
        ws = mgr.get(ws_id)
        gate = threading.Event()
        ws.session.command_gate = gate
        ws.session.command_raises = raises
        result: dict = {}

        def _cmd() -> None:
            r = client.post(
                "/v1/api/command",
                json={"command": command, "ws_id": ws_id},
                headers=_auth("user-1"),
            )
            result["body"] = r.json()

        runner = threading.Thread(target=_cmd, daemon=True)
        runner.start()
        wait_until(lambda: ws._worker_running, timeout=8.0)
        worker = ws.worker_thread
        # The cancel handler's force path shape: abandon the worker.
        with ws._lock:
            ws.worker_thread = None
            ws._worker_running = False
        gate.set()  # the wedged command unwedges LATE
        worker.join(timeout=5)
        runner.join(timeout=10)
        assert not worker.is_alive() and not runner.is_alive()
        return result["body"], worker

    def test_abandoned_command_worker_fires_no_followups(self, app_client):
        """A force-cancelled wedged command that unwedges minutes later
        must not fire clear_ui (every pane would wipe its transcript
        mid-successor-turn) — the owner guard every sibling worker closure
        applies.  done still fires, so the endpoint never hangs."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        body, _ = self._run_abandoned_command(client, mgr, ws_id, command="/clear")
        assert not any(e.get("type") == "clear_ui" for e in ws.ui._enqueued)
        # handle_command genuinely completed, so the (unhung) endpoint's
        # answer reflects that.
        assert body["status"] == "ok"

    def test_abandoned_command_worker_swallows_late_error(self, app_client):
        """The except arm carries the same guard: a stray late 'Command
        error:' from an abandoned worker must not land mid-successor-turn."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        self._run_abandoned_command(
            client, mgr, ws_id, command="/skill", raises=RuntimeError("late boom")
        )
        assert ws.ui.errors == []

    def test_abandoned_init_worker_still_fires_notify(self, app_client, monkeypatch):
        """The completion notify is WORKSTREAM-scoped, not slot-scoped:
        _fire_notify_targets has exactly one call site (the init worker),
        successor turns never notify, so an owner gate here has no
        duplicate to prevent — it only converts force-cancel into
        permanent notification loss for scheduled/unattended workstreams.
        This pins the un-gated behavior against the tempting symmetry
        'fix' (the finally's siblings ARE owner-gated, correctly — they
        mutate live slot/UI state)."""
        client, mgr = app_client
        fired: list = []
        monkeypatch.setattr(
            "turnstone.server._fire_notify_targets",
            lambda ws, content: fired.append(ws.id),
        )
        gate = threading.Event()
        started = threading.Event()
        orig_send = _FakeSession.send

        def wedged_send(self, text, **kwargs):
            started.set()
            assert gate.wait(timeout=10)
            orig_send(self, text, **kwargs)

        monkeypatch.setattr(_FakeSession, "send", wedged_send)
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "sched", "initial_message": "do the thing"},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        ws_id = resp.json()["ws_id"]
        ws = mgr.get(ws_id)
        assert ws is not None
        assert started.wait(timeout=10)
        worker = ws.worker_thread
        with ws._lock:  # the force-cancel abandon shape
            ws.worker_thread = None
            ws._worker_running = False
        gate.set()  # the abandoned init completes LATE
        worker.join(timeout=10)
        assert not worker.is_alive()
        assert fired == [ws_id]  # exactly once, despite the abandonment

    def test_compact_on_error_workstream_restores_error_badge(self, app_client):
        """/compact on an ERROR workstream must exit back to 'error', not
        stamp 'idle' over the operator's investigatable badge — the
        compaction neither retried nor resolved the failed turn (mirrors
        the orphan reaper's ERROR carve-out).  The existing happy-path
        test pins ['thinking', 'idle'] for an IDLE workstream."""
        from turnstone.core.workstream import WorkstreamState

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        ws.state = WorkstreamState.ERROR  # a prior fatal turn's badge
        resp = client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.json() == {"status": "ok"}
        ws.worker_thread.join(timeout=5)
        assert not ws.worker_thread.is_alive()
        # THINKING during the window is honest (work is happening); the
        # exit restores the badge instead of clearing it.
        assert ws.ui.states == ["thinking", "error"]

    def test_retracted_deferred_send_never_dispatches(self, app_client):
        """DELETE /send with a deferred msg_id retracts the entry before
        dispatch — the drain must skip it entirely.  The route falls
        through the session's interjection dequeue (which misses) to the
        workstream's pending list."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "changed my mind"},
            headers=_auth("user-1"),
        )
        msg_id = r.json()["msg_id"]
        d = client.request(
            "DELETE",
            f"/v1/api/workstreams/{ws_id}/send",
            json={"msg_id": msg_id},
            headers=_auth("user-1"),
        )
        assert d.json() == {"status": "removed"}
        assert ws.session.dequeues == [msg_id]  # fall-through was exercised
        gate.set()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        assert ws.session.sends == []
        assert ws.session.queue_calls == []
        # Unknown ids still answer not_found after checking both holders.
        d2 = client.request(
            "DELETE",
            f"/v1/api/workstreams/{ws_id}/send",
            json={"msg_id": "nope"},
            headers=_auth("user-1"),
        )
        assert d2.json() == {"status": "not_found"}

    def test_deferred_sends_dispatch_in_arrival_order(self, app_client):
        """Two sends deferred behind one window dispatch in arrival order,
        each as its own full-fidelity turn (the fake's sends complete
        instantly, so the second never needs the interjection fallback)."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        first = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "first"},
            headers=_auth("user-1"),
        ).json()
        second = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "second"},
            headers=_auth("user-1"),
        ).json()
        assert first["status"] == second["status"] == "queued"
        assert first["msg_id"] != second["msg_id"]
        gate.set()
        wait_until(lambda: len(ws.session.sends) == 2, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["first", "second"]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_force_cancel_of_wedged_command_releases_drain(self, app_client):
        """Force-cancelling a wedged command clears the slot flags — the
        drain polls the same (_worker_running, worker_kind) pair, so a
        deferred message dispatches WITHOUT waiting for the abandoned
        thread to unwedge (the operator's escape hatch keeps working
        under defer exactly as it did under park)."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        zombie = ws.worker_thread
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "deferred behind wedge"},
            headers=_auth("user-1"),
        )
        assert r.json()["status"] == "queued"
        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={"force": True},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        # Dispatch happens while the zombie is STILL wedged on the gate.
        wait_until(lambda: ws.session.sends, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["deferred behind wedge"]
        gate.set()  # let the abandoned thread finish and be joined
        zombie.join(timeout=5)
        assert not zombie.is_alive()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_force_cancel_runs_abandon_machinery_before_idle_emission(self, app_client):
        """The force branch runs the session's abandon machinery BEFORE
        clearing ownership and emitting idle.  Subscribers on the IDLE
        fan-out (the coordinator idle observer's operator-Stop gate,
        the wake watcher's queue read) use the latch and the demote to
        tell an operator-forced IDLE from a turn reaching idle under
        its own power — and the thread force-cancel abandons is stuck
        by definition, so its own exception handler cannot be relied
        on to have run first."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        zombie = ws.worker_thread
        calls: list[str] = []
        ws.session._drain_pending_advisories = lambda: calls.append("abandon")
        ws.ui.on_state_change = lambda s: calls.append(f"state:{s}")
        resp = client.post(
            f"/v1/api/workstreams/{ws_id}/cancel",
            json={"force": True},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        assert calls == ["abandon", "state:idle"]
        gate.set()
        zombie.join(timeout=5)
        assert not zombie.is_alive()

    def test_ws_close_mid_window_drops_pending_and_drain_exits(self, app_client):
        """A workstream closed with deferred sends outstanding drops them
        (documented at-most-once contract) and the drain task retires
        itself — no leaked task, no dispatch into a closed workstream."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "never delivered"},
            headers=_auth("user-1"),
        )
        assert r.json()["status"] == "queued"
        with ws._lock:
            ws._closed = True  # the SessionManager.close tombstone shape
        gate.set()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        assert ws.session.sends == []
        assert ws.session.queue_calls == []

    def test_deferred_send_dispatches_into_post_swap_session(self, app_client):
        """The drain re-captures ws.session per attempt: a /resume-style
        identity swap during the window routes the deferred message into
        the POST-swap session — the same guarantee the park's
        per-iteration re-capture provided."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        old_session = ws.session
        gate = threading.Event()
        old_session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "post-swap please"},
            headers=_auth("user-1"),
        )
        assert r.json()["status"] == "queued"
        new_session = _FakeSession(ws_id=ws_id, user_id="user-1")
        ws.session = new_session  # the in-place identity swap
        gate.set()
        wait_until(lambda: new_session.sends, timeout=8.0)
        assert [s[0] for s in new_session.sends] == ["post-swap please"]
        assert old_session.sends == []
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_rejected_deferred_entry_waits_for_slot_then_fresh_spawns(self, app_client):
        """The drain's rejection arm: an entry the interjection fallback
        refuses (cross-user here; attachments/oversized take the same
        path) is NOT dropped — it waits for the slot to free and then
        dispatches as its own fresh turn.  The queued ack must never
        become a silent drop while the workstream lives."""
        from turnstone.core.session import CrossUserInterjectionError

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        send_gate = threading.Event()
        ws.session.compact_gate = gate
        ws.session.send_gate = send_gate
        ws.session.queue_raises = CrossUserInterjectionError("another participant's turn")
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        for msg in ("first", "second"):
            r = client.post(
                f"/v1/api/workstreams/{ws_id}/send",
                json={"message": msg},
                headers=_auth("user-1"),
            )
            assert r.json()["status"] == "queued"
        gate.set()
        # Entry 1 spawns fresh and WEDGES in send() on send_gate — a live
        # turn now holds the slot, so entry 2 takes the interjection
        # fallback and is refused (the fake raises cross-user).
        wait_until(lambda: ws.session.queue_calls == ["second"], timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["first"]
        send_gate.set()  # the turn ends; the slot frees
        wait_until(lambda: len(ws.session.sends) == 2, timeout=8.0)
        # Entry 2 dispatched as its own fresh turn — exactly one refused
        # queue attempt, then the fresh-spawn arm.
        assert [s[0] for s in ws.session.sends] == ["first", "second"]
        assert ws.session.queue_calls == ["second"]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_drain_crash_requeues_entry_and_retries(self, app_client):
        """A crash inside a claimed entry's dispatch attempt (the real-world
        shape: Thread.start raising under thread exhaustion) must not eat
        the acknowledged message — the per-iteration handler re-inserts it
        at head and retries after a backoff, keeping the docstring's
        no-silent-drop contract."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "survive the crash"},
            headers=_auth("user-1"),
        )
        assert r.json()["status"] == "queued"
        with ws._lock:
            entry = ws._pending_sends[0]
        real_attempt = entry.attempt
        calls = {"n": 0}

        def crash_once(session):
            calls["n"] += 1
            if calls["n"] == 1:
                raise RuntimeError("simulated Thread.start failure")
            return real_attempt(session)

        entry.attempt = crash_once
        gate.set()
        wait_until(lambda: ws.session.sends, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["survive the crash"]
        assert calls["n"] == 2  # crashed once, re-queued, dispatched on retry
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_persistently_crashing_entry_is_never_dropped_and_retract_frees_drain(self, app_client):
        """A persistently crashing attempt keeps the entry alive (retry
        loop, never a silent drop) — and the user's DELETE still works
        mid-crash-loop: the re-inserted entry is marked retracted, the
        loop-top purge drops it, and the drain retires cleanly."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "doomed"},
            headers=_auth("user-1"),
        )
        msg_id = r.json()["msg_id"]
        with ws._lock:
            entry = ws._pending_sends[0]
        calls = {"n": 0}

        def always_crash(_session):
            calls["n"] += 1
            raise RuntimeError("persistent dispatch failure")

        entry.attempt = always_crash
        gate.set()
        # Two attempts across the ~1s backoff prove the loop survived the
        # first crash with the entry intact (a dropped entry can't be
        # re-attempted) and nothing was dispatched behind the user's back.
        wait_until(lambda: calls["n"] >= 2, timeout=8.0)
        assert ws.session.sends == []
        # ``calls["n"]`` increments as the FIRST statement of the attempt, so
        # the counter crosses 2 while the drain still holds the entry CLAIMED
        # (popped, dispatch in flight).  Retract only scans ``_pending_sends``
        # and correctly answers not_found for a claimed entry, so firing the
        # DELETE off the counter alone races the crash path's re-insert and
        # loses whenever the re-insert is slower than the request -- which it
        # is under pytest, where the log handlers make the intervening
        # ``log.exception`` roughly as expensive as wait_until's poll interval.
        # Wait for the state this test is actually about: the entry BACK on
        # the list, mid-crash-loop, retractable.
        wait_until(
            lambda: any(e.msg_id == msg_id for e in list(ws._pending_sends)),
            timeout=8.0,
        )
        d = client.request(
            "DELETE",
            f"/v1/api/workstreams/{ws_id}/send",
            json={"msg_id": msg_id},
            headers=_auth("user-1"),
        )
        assert d.json() == {"status": "removed"}
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        assert ws.session.sends == []

    def test_fresh_send_defers_behind_claimed_entry(self, app_client):
        """The order barrier's drain-alive term: a send arriving while the
        drain has CLAIMED an entry (off the list, dispatch in flight) must
        defer behind it, not overtake — the pre-fix route dispatched
        immediately (the list looked empty) and inverted answer order
        against the acknowledged send."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r1 = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "first"},
            headers=_auth("user-1"),
        )
        assert r1.json()["deferred"] is True
        with ws._lock:
            entry = ws._pending_sends[0]
        real_attempt = entry.attempt
        claimed = threading.Event()
        release = threading.Event()

        def gated_attempt(session):
            claimed.set()
            assert release.wait(timeout=10)
            return real_attempt(session)

        entry.attempt = gated_attempt
        gate.set()  # window closes; the drain claims "first" and blocks
        wait_until(claimed.is_set, timeout=8.0)
        with ws._lock:
            assert ws._pending_sends == []  # claimed — the list alone says "free"
        big = "y" * 5000  # full-fidelity: can't fold into any live turn
        r2 = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": big},
            headers=_auth("user-1"),
        )
        # Deferred via the barrier (drain alive), never dispatched directly.
        assert r2.json()["status"] == "queued"
        assert r2.json()["deferred"] is True
        assert ws.session.sends == []
        release.set()
        wait_until(lambda: len(ws.session.sends) == 2, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["first", big]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_drain_exit_re_arms_wake_gate_after_pure_retraction(self, app_client, monkeypatch):
        """A pending list that empties by RETRACTION never runs a deferred
        turn, so no worker-exit backstop would re-run the wake gate that
        yielded to the barrier — the drain's clean exit must re-arm it
        itself (trigger="drain-exit"), or a nudge parked during the window
        strands until some unrelated future dispatch."""
        from turnstone.core import idle_nudge_watcher

        wake_calls: list[str] = []
        monkeypatch.setattr(
            idle_nudge_watcher,
            "wake_workstream_if_pending",
            lambda ws, *, trigger="unspecified": (wake_calls.append(trigger), False)[1],
        )
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "will be retracted"},
            headers=_auth("user-1"),
        )
        d = client.request(
            "DELETE",
            f"/v1/api/workstreams/{ws_id}/send",
            json={"msg_id": r.json()["msg_id"]},
            headers=_auth("user-1"),
        )
        assert d.json() == {"status": "removed"}
        gate.set()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        wait_until(lambda: "drain-exit" in wake_calls, timeout=8.0)
        assert ws.session.sends == []

    def test_deferred_dispatch_emits_message_dispatched(self, app_client):
        """Fresh-spawn arm of the settle protocol: dispatching a deferred
        entry emits pane-tier ``message_dispatched {msg_id}`` (no
        ``folded`` key) so the queued chip promotes exactly when the
        retraction window truly closes."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "settle me"},
            headers=_auth("user-1"),
        )
        msg_id = r.json()["msg_id"]
        queued_events = [e for e in ws.ui._enqueued if e.get("type") == "message_queued"]
        assert [e["msg_id"] for e in queued_events] == [msg_id]
        assert [e["sender"] for e in queued_events] == ["user-1"]
        gate.set()
        wait_until(
            lambda: any(e.get("type") == "message_dispatched" for e in ws.ui._enqueued),
            timeout=8.0,
        )
        dispatched = [e for e in ws.ui._enqueued if e.get("type") == "message_dispatched"]
        assert dispatched == [{"type": "message_dispatched", "msg_id": msg_id}]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_folded_deferred_dispatch_emits_folded_flag(self, app_client):
        """Interjection fold-in arm: a deferred entry that dispatches INTO a
        live turn's queue emits ``folded: true`` — the client must clear
        only its deferred flag (DELETE still genuinely removes the message
        from the interjection queue until the seam drains), not promote."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        send_gate = threading.Event()
        ws.session.compact_gate = gate
        ws.session.send_gate = send_gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        first = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "first"},
            headers=_auth("user-1"),
        ).json()
        second = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "second"},
            headers=_auth("user-1"),
        ).json()
        gate.set()
        # "first" spawns fresh and wedges in send() — a live turn holds the
        # slot, so "second" (small, no attachments) folds into its
        # interjection queue.
        wait_until(lambda: ws.session.queue_calls == ["second"], timeout=8.0)
        send_gate.set()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        dispatched = [e for e in ws.ui._enqueued if e.get("type") == "message_dispatched"]
        assert dispatched == [
            {"type": "message_dispatched", "msg_id": first["msg_id"]},
            {"type": "message_dispatched", "msg_id": second["msg_id"], "folded": True},
        ]
        assert [s[0] for s in ws.session.sends] == ["first"]

    def test_deferred_send_list_saturation_returns_queue_full(self, app_client):
        """The deferred list is bounded (workstream.PENDING_SENDS_MAX — the
        shared constant ChatSession._QUEUE_MAX aliases): the 11th pending
        send answers queue_full instead of silently pinning message +
        attachment bytes per entry for a whole command window and then
        costing one unattended turn each."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        for i in range(10):
            r = client.post(
                f"/v1/api/workstreams/{ws_id}/send",
                json={"message": f"m{i}"},
                headers=_auth("user-1"),
            )
            assert r.json()["status"] == "queued", i
        r11 = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "one too many"},
            headers=_auth("user-1"),
        )
        body = r11.json()
        assert body["status"] == "queue_full"
        assert "msg_id" not in body  # never acknowledged
        with ws._lock:
            assert len(ws._pending_sends) == 10
        gate.set()
        wait_until(lambda: len(ws.session.sends) == 10, timeout=8.0)
        assert [s[0] for s in ws.session.sends] == [f"m{i}" for i in range(10)]
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_drain_spawn_failure_rolls_back_and_answers_queue_full(self, app_client, monkeypatch):
        """Thread.start failing at the drain-spawn site must not leave a
        phantom acknowledged-nowhere entry (the 500-after-registration
        class): entry and slot roll back under the same lock, the client
        gets the retryable queue_full, and a retry once resources return
        dispatches exactly once — no duplicate turns."""
        from turnstone.core import session_routes

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )

        class _ExhaustedThread(threading.Thread):
            def start(self) -> None:
                raise RuntimeError("can't start new thread")

        real_factory = session_routes._make_drain_thread
        monkeypatch.setattr(
            session_routes,
            "_make_drain_thread",
            lambda _ws: _ExhaustedThread(target=lambda: None, daemon=True),
        )
        r = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "refused under exhaustion"},
            headers=_auth("user-1"),
        )
        assert r.json()["status"] == "queue_full"
        with ws._lock:
            assert ws._pending_sends == []  # rolled back — no phantom
            assert ws._pending_drain is None
        # Resources recover: a plain retry defers and dispatches ONCE.
        monkeypatch.setattr(session_routes, "_make_drain_thread", real_factory)
        r2 = client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "the retry"},
            headers=_auth("user-1"),
        )
        assert r2.json()["status"] == "queued"
        assert r2.json()["deferred"] is True
        gate.set()
        wait_until(lambda: ws.session.sends, timeout=8.0)
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        assert [s[0] for s in ws.session.sends] == ["the retry"]

    def test_command_spawn_failure_answers_503_not_ok(self, app_client, monkeypatch):
        """A command worker that never spawned must not answer 200 ok — the
        endpoint's generic catch-all used to swallow the dispatcher's
        Thread.start re-raise, telling SDK callers their /clear ran while
        the context stayed un-cleared."""
        from turnstone.core import session_worker

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None

        def _exhausted(*_a, **_kw):
            raise RuntimeError("can't start new thread")

        monkeypatch.setattr(session_worker, "send", _exhausted)
        resp = client.post(
            "/v1/api/command",
            json={"command": "/clear", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 503
        assert resp.json()["status"] == "error"
        assert ws.session.commands == []  # the command never ran

    def test_drain_exit_wake_raise_is_contained(self, app_client, monkeypatch, caplog):
        """A raising drain-exit wake (session_worker.send re-raises
        Thread.start failures) must stay inside the wake's own guard —
        it runs AFTER the drain retired its slot, so reaching the
        last-resort handler would clear a slot this thread no longer
        owns (a successor drain's live registration)."""
        import logging

        from turnstone.core import idle_nudge_watcher

        def _raising_gate(ws, *, trigger="unspecified"):
            if trigger == "drain-exit":
                raise RuntimeError("can't start new thread")
            return False

        monkeypatch.setattr(idle_nudge_watcher, "wake_workstream_if_pending", _raising_gate)
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "dispatch me"},
            headers=_auth("user-1"),
        )
        with caplog.at_level(logging.WARNING, logger="turnstone.core.session_routes"):
            gate.set()
            wait_until(lambda: ws.session.sends, timeout=8.0)
            wait_until(lambda: self._drain_idle(ws), timeout=8.0)
            wait_until(
                lambda: any("drain_exit_wake_failed" in r.message for r in caplog.records),
                timeout=8.0,
            )
        # The raise was contained by the wake's own guard — never the
        # last-resort handler (whose log would be a false failure for a
        # drain that exited cleanly).
        assert not any("pending_drain_failed" in r.message for r in caplog.records)
        # The seam stays fully serviceable: another defer cycle works.
        gate2 = threading.Event()
        ws.session.compact_gate = gate2
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "and me"},
            headers=_auth("user-1"),
        )
        gate2.set()
        wait_until(lambda: len(ws.session.sends) == 2, timeout=8.0)
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)

    def test_closed_drain_exit_runs_no_wake(self, app_client, monkeypatch):
        """The drain-exit wake backstop belongs to the CLEAN exit only: a
        closed workstream is torn down, and firing the gate there would
        be work on a corpse.  (The clean-exit case is pinned by
        test_drain_exit_re_arms_wake_gate_after_pure_retraction.)"""
        from turnstone.core import idle_nudge_watcher

        triggers: list[str] = []
        monkeypatch.setattr(
            idle_nudge_watcher,
            "wake_workstream_if_pending",
            lambda ws, *, trigger="unspecified": (triggers.append(trigger), False)[1],
        )
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "dies with the ws"},
            headers=_auth("user-1"),
        )
        with ws._lock:
            ws._closed = True  # tombstone, as SessionManager.close sets it
        gate.set()
        wait_until(lambda: self._drain_idle(ws), timeout=8.0)
        assert "drain-exit" not in triggers
        assert ws.session.sends == []

    def test_drain_last_resort_clear_is_identity_guarded(self, app_client, monkeypatch, caplog):
        """Drive the drain's OUTER except (loop machinery failing — here
        the closed-arm log call) and prove the last-resort slot-clear
        executes its identity guard: the slot is this drain's own, so it
        clears; a successor's registration would be left alone (the
        guard compares thread identity, the sibling exit-seam pattern)."""
        import logging

        from turnstone.core import session_routes

        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        gate = threading.Event()
        ws.session.compact_gate = gate
        client.post(
            "/v1/api/command",
            json={"command": "/compact", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        client.post(
            f"/v1/api/workstreams/{ws_id}/send",
            json={"message": "stranded by the crash"},
            headers=_auth("user-1"),
        )

        def _broken_warning(*_a, **_kw):
            raise RuntimeError("log backend down")

        monkeypatch.setattr(session_routes.log, "warning", _broken_warning)
        with ws._lock:
            ws._closed = True  # closed arm with a pending entry → log.warning
        with caplog.at_level(logging.ERROR, logger="turnstone.core.session_routes"):
            gate.set()
            wait_until(
                lambda: any("pending_drain_failed" in r.message for r in caplog.records),
                timeout=8.0,
            )
        # The identity-guarded clear ran for the drain's OWN slot.
        wait_until(lambda: ws._pending_drain is None, timeout=8.0)
        assert ws.session.sends == []

    def test_exit_command_emits_ended_info_and_never_answers(self, app_client):
        """should_exit commands shut the session down — the worker emits
        the ended notice and never launches an answering turn (sends
        during the window defer in the /send route and belong to whatever
        follows the shutdown, not to this worker)."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        ws.session.exit_commands = {"/exit"}
        resp = client.post(
            "/v1/api/command",
            json={"command": "/exit", "ws_id": ws_id},
            headers=_auth("user-1"),
        )
        assert resp.status_code == 200
        ws.worker_thread.join(timeout=5)
        assert ws.session.sends == []
        assert any("Session ended" in m for m in ws.ui.infos)

    def test_non_compact_command_refused_while_worker_running(self, app_client):
        """The old inline path was serialized by the event loop itself; the
        worker-slot dispatch restores that mutual exclusion with an explicit
        busy answer — /clear can no longer interleave with a live turn or a
        running compaction."""
        client, mgr = app_client
        ws_id = self._create_ws(client)
        ws = mgr.get(ws_id)
        assert ws is not None
        with ws._lock:
            ws._worker_running = True  # a turn / compaction is in flight
        try:
            resp = client.post(
                "/v1/api/command",
                json={"command": "/clear", "ws_id": ws_id},
                headers=_auth("user-1"),
            )
        finally:
            with ws._lock:
                ws._worker_running = False
        assert resp.status_code == 409
        assert resp.json()["status"] == "busy"
        assert ws.session.commands == []


class TestRemoteLifecycleCommandBoundary:
    """The HTTP command bridge never reaches storage-global REPL lifecycle code."""

    @pytest.mark.parametrize(
        "command",
        [
            "/workstreams",
            "/resume secret-alias",
            "/resume missing-alias",
            "/delete secret-alias",
            "/delete missing-alias",
        ],
    )
    def test_cli_only_command_is_rejected_before_dispatch_without_oracle(
        self,
        app_client,
        command: str,
    ) -> None:
        """Known/private and missing targets have one inert, non-disclosing result."""
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        storage.create_project("secret-project", "Secret Project", "victim-user")
        storage.register_workstream(
            "secret-ws",
            node_id="node-test",
            name="secret-name",
            user_id="victim-user",
            project_id="secret-project",
        )
        assert storage.set_workstream_alias("secret-ws", "secret-alias") is True
        storage.save_message("secret-ws", "user", "private history")

        created = client.post(
            "/v1/api/workstreams/new",
            json={"name": "caller-workstream"},
            headers=_auth("caller-user"),
        )
        assert created.status_code == 200
        caller_ws_id = created.json()["ws_id"]
        caller_ws = mgr.get(caller_ws_id)
        assert caller_ws is not None
        assert caller_ws.session is not None
        original_session_id = caller_ws.session.ws_id
        original_messages = list(caller_ws.session.messages)

        response = client.post(
            "/v1/api/command",
            json={"command": command, "ws_id": caller_ws_id},
            headers=_auth("caller-user"),
        )

        assert response.status_code == 400
        assert response.json() == {
            "error": "This workstream command is only available in the local CLI."
        }
        assert caller_ws.worker_thread is None
        assert caller_ws.session.commands == []
        assert caller_ws.session.ws_id == original_session_id
        assert caller_ws.session.messages == original_messages
        assert storage.get_workstream("secret-ws") is not None
        assert [turn.text for turn in storage.load_message_turns("secret-ws")] == [
            "private history"
        ]


class TestRequireProjectMountWiring:
    """server.require_project is wired on the REAL interactive create mount
    (create_gate_require_project=True on interactive_endpoint_config). Synthetic-
    cfg unit tests can't catch a mis-wire on the actual mount, so drive the
    mounted endpoint end-to-end."""

    def test_projectless_interactive_create_gated_when_on(self, app_client, make_config_store):
        client, _mgr = app_client
        client.app.state.config_store = make_config_store(**{"server.require_project": True})
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "no-project"},
            headers=_auth("user-1", permissions=frozenset({"workstreams.create"})),
        )
        assert resp.status_code == 400, resp.json()
        assert resp.json().get("code") == "require_project"

    def test_projectless_interactive_create_allowed_when_off(self, app_client, make_config_store):
        client, _mgr = app_client
        client.app.state.config_store = make_config_store()  # flag off (default)
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"name": "no-project"},
            headers=_auth("user-1", permissions=frozenset({"workstreams.create"})),
        )
        body = resp.json()
        assert not (resp.status_code == 400 and body.get("code") == "require_project"), body

    def test_flag_off_forwarded_service_cannot_fork_private_nonmember(
        self, app_client, make_config_store, monkeypatch
    ):
        """The resume read gate runs before persona/history reads or destination create.

        A console service token may forward the real end-user id, but its cross-tenant
        service scope belongs to the console identity. It must not make that different
        effective user omniscient.
        """
        from turnstone.core.auth import JWT_AUD_SERVER, create_jwt
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        client.app.state.config_store = make_config_store()  # invariant is flag-independent
        storage = get_storage()
        assert storage is not None
        storage.create_project("private-project", "Secret", "victim-user")
        source_id = "a" * 32
        storage.register_workstream(
            source_id,
            node_id="node-test",
            name="secret-source",
            user_id="victim-user",
            project_id="private-project",
        )
        assert storage.set_workstream_alias(source_id, "secret-alias") is True

        source_config_read = MagicMock(side_effect=AssertionError("private source config read"))
        monkeypatch.setattr(storage, "load_workstream_config", source_config_read)
        token = create_jwt(
            user_id="console-service",
            scopes=frozenset({"read", "write", "approve", "service"}),
            source="console",
            secret=_TEST_JWT_SECRET,
            audience=JWT_AUD_SERVER,
            permissions=frozenset({"workstreams.create"}),
        )
        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "name": "forbidden-fork",
                "resume_ws": "secret-alias",
                "user_id": "forwarded-user",
            },
            headers={"Authorization": f"Bearer {token}"},
        )

        assert resp.status_code == 404
        assert resp.json() == {"error": "Workstream not found"}
        assert mgr.list_all() == []
        source_config_read.assert_not_called()


class TestCreateForkRollback:
    """A requested fork is one create transaction at the mounted HTTP edge."""

    @staticmethod
    def _register_source(storage: Any, ws_id: str, *, with_history: bool) -> None:
        storage.register_workstream(
            ws_id,
            node_id="node-test",
            name="fork-source",
            user_id="user-1",
        )
        if with_history:
            storage.save_message(ws_id, "user", "durable source history")

    @staticmethod
    def _global_events(client: Any) -> list[dict[str, Any]]:
        events: list[dict[str, Any]] = []
        global_queue = client.app.state.global_queue
        while True:
            try:
                events.append(global_queue.get_nowait())
            except queue.Empty:
                return events

    def test_source_disappears_after_validation_rolls_back_destination(
        self, app_client, monkeypatch
    ) -> None:
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "b" * 32
        destination_id = "c" * 32
        self._register_source(storage, source_id, with_history=False)

        original_fork = _FakeSession.fork_from_storage

        def _disappear_at_pre_commit(
            session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            assert fork_source_id == source_id
            assert storage.delete_workstream(source_id) is True
            return original_fork(
                session,
                fork_source_id,
                principal_id=principal_id,
                source_reservation_token=source_reservation_token,
                trusted_internal=trusted_internal,
            )

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _disappear_at_pre_commit)
        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "vanished-source-fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 409
        assert resp.json() == {"error": "Fork source is no longer available"}
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) is None
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert not {
            event["type"]
            for event in self._global_events(client)
            if event.get("type") in {"ws_created", "ws_rename"}
        }

    def test_source_replacement_after_preflight_cannot_inherit_fork(
        self,
        app_client,
        monkeypatch,
    ) -> None:
        from turnstone.core.storage import ForkCloneExpectation, get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "8" * 32
        destination_id = "9" * 32
        self._register_source(storage, source_id, with_history=True)
        replacement_token = "replacement-source-incarnation"

        def _replace_at_pre_commit(
            session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            assert fork_source_id == source_id
            assert source_reservation_token
            assert storage.get_workstream_reservation_token(source_id) == (source_reservation_token)
            assert storage.delete_workstream(source_id) is True
            assert storage.register_workstream(
                source_id,
                user_id="user-1",
                name="replacement-source",
                state="idle",
                kind="interactive",
                fork_reservation_token=replacement_token,
            )
            storage.save_message(source_id, "user", "replacement must not fork")
            destination_token = str(getattr(session, "_fork_reservation_token", ""))
            assert destination_token
            return storage.clone_workstream(
                source_id,
                session.ws_id,
                principal_id=principal_id,
                trusted_internal=trusted_internal,
                expected_session=ForkCloneExpectation(
                    persona_config=(),
                    project_id="",
                    project_name="",
                    project_writable=False,
                    destination_reservation_token=destination_token,
                    source_reservation_token=source_reservation_token,
                ),
            )

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _replace_at_pre_commit)
        response = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "replaced-source-fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert response.status_code == 409
        assert response.json() == {"error": "Fork source is no longer available"}
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) is None
        replacement = storage.get_workstream(source_id)
        assert replacement is not None
        assert replacement["name"] == "replacement-source"
        assert "fork_reservation_token" not in replacement
        assert storage.get_workstream_reservation_token(source_id) == replacement_token
        assert [turn.text for turn in storage.load_message_turns(source_id)] == [
            "replacement must not fork"
        ]

    def test_destination_storage_failure_rolls_back_destination(
        self, app_client, monkeypatch
    ) -> None:
        from turnstone.core.storage import ForkDestinationConflictError, get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "d" * 32
        destination_id = "e" * 32
        self._register_source(storage, source_id, with_history=True)
        assert storage.load_message_turns(source_id)

        fork_calls: list[tuple[str, str, bool]] = []

        def _fail_fork(
            _session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            fork_calls.append((fork_source_id, principal_id, trusted_internal))
            raise ForkDestinationConflictError("destination raced")

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _fail_fork)
        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "failed-history-fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 409
        assert resp.json() == {"error": "Workstream creation was superseded"}
        assert fork_calls == [(source_id, "user-1", False)]
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) is None
        assert storage.load_message_turns(source_id)
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert not {
            event["type"]
            for event in self._global_events(client)
            if event.get("type") in {"ws_created", "ws_rename"}
        }

    def test_caller_chosen_destination_collision_preserves_existing_row(self, app_client) -> None:
        """An unloaded durable row is not a blank reservation for a fork.

        ``register_workstream`` historically ignored a duplicate id.  That
        made a caller-chosen id collide with an existing empty workstream,
        after which the clone could replace its config/history and the create
        rollback could delete it outright.  Reject the collision before either
        mutation, even when owner and project happen to match.
        """
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        project_id = "collision-project"
        source_id = "8" * 32
        destination_id = "9" * 32
        storage.create_project(project_id, "Collision", "user-1", visibility="private")
        storage.register_workstream(
            source_id,
            node_id="source-node",
            name="source",
            state="idle",
            user_id="user-1",
            project_id=project_id,
        )
        storage.save_message(source_id, "user", "source history")
        storage.register_workstream(
            destination_id,
            node_id="original-node",
            name="existing empty destination",
            state="idle",
            user_id="user-1",
            project_id=project_id,
        )
        storage.save_workstream_config(destination_id, {"keep": "untouched"})
        before = storage.get_workstream(destination_id)
        assert before is not None
        assert storage.load_message_turns(destination_id) == []

        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "colliding fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 409, resp.json()
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) == before
        assert storage.load_message_turns(destination_id) == []
        assert storage.load_workstream_config(destination_id) == {"keep": "untouched"}
        assert [turn.text for turn in storage.load_message_turns(source_id)] == ["source history"]
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert not {
            event["type"]
            for event in self._global_events(client)
            if event.get("type") in {"ws_created", "ws_rename"}
        }

    @pytest.mark.parametrize("lifecycle", ["close", "delete"])
    def test_destination_retired_while_clone_blocked_cannot_publish_or_resurrect(
        self,
        app_client,
        monkeypatch,
        lifecycle: str,
    ) -> None:
        """A pending create loses ownership when its exact slot is retired."""
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "a" * 32
        destination_id = "b" * 32
        self._register_source(storage, source_id, with_history=True)
        entered_clone = threading.Event()
        release_clone = threading.Event()
        original_fork = _FakeSession.fork_from_storage

        def _blocked_fork(
            session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            entered_clone.set()
            assert release_clone.wait(timeout=10), "test did not release clone"
            return original_fork(
                session,
                fork_source_id,
                principal_id=principal_id,
                source_reservation_token=source_reservation_token,
                trusted_internal=trusted_internal,
            )

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _blocked_fork)
        responses: list[Any] = []
        request_errors: list[BaseException] = []

        def _create_fork() -> None:
            try:
                responses.append(
                    client.post(
                        "/v1/api/workstreams/new",
                        json={"ws_id": destination_id, "resume_ws": source_id},
                        headers=_auth("user-1"),
                    )
                )
            except BaseException as exc:  # pragma: no cover - diagnostic capture
                request_errors.append(exc)

        request_thread = threading.Thread(target=_create_fork, daemon=True)
        request_thread.start()
        assert entered_clone.wait(timeout=5), "fork request never reached clone"
        # Deferred creates are deliberately hidden from public manager lookup
        # until lifecycle birth; inspect the exact internal reservation to
        # drive the terminal-race seam.
        pending = mgr._workstreams.get(destination_id)
        assert pending is not None
        try:
            if lifecycle == "close":
                assert mgr.close(destination_id) is True
            else:
                assert storage.delete_workstream(destination_id) is True
                assert mgr.delete(destination_id) is True
        finally:
            release_clone.set()
        request_thread.join(timeout=10)

        assert not request_thread.is_alive()
        assert request_errors == []
        assert len(responses) == 1
        resp = responses[0]
        assert resp.status_code == 409, resp.text
        assert mgr.get(destination_id) is None
        destination = storage.get_workstream(destination_id)
        if lifecycle == "delete":
            assert destination is None
        else:
            # The create rollback may delete this never-advertised row. If it
            # elects to preserve the concurrent close, it must stay retired.
            assert destination is None or destination["state"] == "closed"
            if destination is not None:
                assert storage.load_message_turns(destination_id) == []
        assert [turn.text for turn in storage.load_message_turns(source_id)] == [
            "durable source history"
        ]
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        events = self._global_events(client)
        assert not {
            event["type"] for event in events if event.get("type") in {"ws_created", "ws_rename"}
        }
        # The reservation never crossed lifecycle birth, so terminal cleanup
        # is silent: neither a phantom create nor a close-without-create is
        # observable on the global stream.
        assert not [event for event in events if event.get("ws_id") == destination_id]

    @pytest.mark.anyio
    @pytest.mark.parametrize("anyio_backend", ["asyncio"])
    async def test_cancelled_request_waits_for_clone_then_rolls_back(
        self,
        app_client,
        monkeypatch,
        anyio_backend: str,
    ) -> None:
        """Request cancellation cannot outrun the non-cancellable clone."""
        import asyncio

        import httpx

        assert anyio_backend == "asyncio"
        sync_client, mgr = app_client
        storage = sync_client.app.state.auth_storage
        assert storage is not None
        source_id = "c" * 32
        destination_id = "d" * 32
        attachment_id = "e" * 64
        self._register_source(storage, source_id, with_history=False)
        source_row = storage.save_message(source_id, "user", "attached source")
        storage.save_attachment(
            attachment_id,
            "source.txt",
            "text/plain",
            6,
            "text",
            b"source",
        )
        storage.set_message_attachments(source_id, source_row, [attachment_id])
        source_attachment = storage.get_attachment(attachment_id)
        assert source_attachment is not None and source_attachment["refcount"] == 1

        entered_clone = threading.Event()
        release_clone = threading.Event()
        clone_finished = threading.Event()
        original_fork = _FakeSession.fork_from_storage

        def _blocked_fork(
            session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            entered_clone.set()
            assert release_clone.wait(timeout=10), "test did not release clone"
            try:
                return original_fork(
                    session,
                    fork_source_id,
                    principal_id=principal_id,
                    source_reservation_token=source_reservation_token,
                    trusted_internal=trusted_internal,
                )
            finally:
                clone_finished.set()

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _blocked_fork)
        transport = httpx.ASGITransport(app=sync_client.app)
        async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
            request_task = asyncio.create_task(
                client.post(
                    "/v1/api/workstreams/new",
                    json={"ws_id": destination_id, "resume_ws": source_id},
                    headers=_auth("user-1"),
                )
            )
            for _ in range(500):
                if entered_clone.is_set():
                    break
                await asyncio.sleep(0.01)
            assert entered_clone.is_set(), "fork request never reached clone"
            request_task.cancel()
            try:
                await asyncio.sleep(0.05)
                assert not request_task.done()
                assert not clone_finished.is_set()
            finally:
                release_clone.set()
            with pytest.raises(asyncio.CancelledError):
                await request_task

        assert clone_finished.is_set()
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) is None
        assert [turn.text for turn in storage.load_message_turns(source_id)] == ["attached source"]
        attachment = storage.get_attachment(attachment_id)
        assert attachment is not None and attachment["refcount"] == 1
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert not {
            event["type"]
            for event in self._global_events(sync_client)
            if event.get("type") in {"ws_created", "ws_rename"}
        }

    def test_source_project_deleted_after_preflight_is_uniform_409(
        self, app_client, monkeypatch
    ) -> None:
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        storage.create_project("fork-project", "Fork", "user-1", visibility="public")
        source_id = "6" * 32
        destination_id = "7" * 32
        storage.register_workstream(
            source_id,
            node_id="node-test",
            name="project-source",
            user_id="user-1",
            project_id="fork-project",
        )
        original_fork = _FakeSession.fork_from_storage

        def _delete_project_at_pre_commit(
            session: _FakeSession,
            fork_source_id: str,
            *,
            principal_id: str,
            source_reservation_token: str,
            trusted_internal: bool = False,
        ) -> Any:
            assert storage.delete_project("fork-project") is True
            return original_fork(
                session,
                fork_source_id,
                principal_id=principal_id,
                source_reservation_token=source_reservation_token,
                trusted_internal=trusted_internal,
            )

        monkeypatch.setattr(_FakeSession, "fork_from_storage", _delete_project_at_pre_commit)
        resp = client.post(
            "/v1/api/workstreams/new",
            json={"ws_id": destination_id, "resume_ws": source_id},
            headers=_auth("user-1"),
        )

        assert resp.status_code == 409
        assert resp.json() == {"error": "Fork source is no longer available"}
        assert mgr.get(destination_id) is None
        assert storage.get_workstream(destination_id) is None
        assert storage.get_workstream(source_id) is not None
        assert not [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert not {
            event["type"]
            for event in self._global_events(client)
            if event.get("type") in {"ws_created", "ws_rename"}
        }

    def test_empty_source_is_successful_fork(self, app_client) -> None:
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "f" * 32
        destination_id = "1" * 32
        self._register_source(storage, source_id, with_history=False)
        assert storage.load_message_turns(source_id) == []

        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "empty-source-fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 200
        assert resp.json()["resumed"] is True
        assert resp.json()["message_count"] == 0
        destination = mgr.get(destination_id)
        assert destination is not None
        assert destination.session is not None
        assert destination.session.fork_calls == [(source_id, "user-1", False)]
        assert {event["type"] for event in destination.ui._enqueued} >= {"clear_ui"}
        assert storage.get_workstream(destination_id) is not None
        events = self._global_events(client)
        assert [event["type"] for event in events if event.get("type") == "ws_created"] == [
            "ws_created"
        ]
        assert [event["type"] for event in events if event.get("type") == "ws_rename"] == [
            "ws_rename"
        ]

    def test_nonempty_source_commits_before_publication(self, app_client) -> None:
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "2" * 32
        destination_id = "3" * 32
        self._register_source(storage, source_id, with_history=True)

        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "name": "copied-history-fork",
                "resume_ws": source_id,
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 200, resp.json()
        assert resp.json()["resumed"] is True
        assert resp.json()["message_count"] == 1
        assert [turn.text for turn in storage.load_message_turns(destination_id)] == [
            "durable source history"
        ]
        destination = mgr.get(destination_id)
        assert destination is not None and destination.session is not None
        assert [turn.text for turn in destination.session.messages] == ["durable source history"]
        assert destination.session.fork_calls == [(source_id, "user-1", False)]
        created = [
            event
            for event in storage.list_audit_events(action="workstream.created")
            if event["resource_id"] == destination_id
        ]
        assert len(created) == 1

    def test_successful_fork_still_dispatches_initial_message(self, app_client) -> None:
        from turnstone.core.storage import get_storage

        client, mgr = app_client
        storage = get_storage()
        assert storage is not None
        source_id = "4" * 32
        destination_id = "5" * 32
        self._register_source(storage, source_id, with_history=False)

        resp = client.post(
            "/v1/api/workstreams/new",
            json={
                "ws_id": destination_id,
                "resume_ws": source_id,
                "initial_message": "continue from the fork",
            },
            headers=_auth("user-1"),
        )

        assert resp.status_code == 200, resp.json()
        assert resp.json()["resumed"] is True
        destination = mgr.get(destination_id)
        assert destination is not None and destination.session is not None
        assert destination.worker_thread is not None
        destination.worker_thread.join(timeout=5)
        assert not destination.worker_thread.is_alive()
        assert destination.session.sends == [("continue from the fork", None, None)]