"""SCHEDULING_TIMEOUT is a failed-side terminal for the depends_on cascade.

A parent that the sweeper expires into scheduling_timeout must unblock an
any_exit child (it reached a terminal) and cascade-cancel a default-policy
child (its output never materialized). Before the fix, SCHEDULING_TIMEOUT was
missing from `_DEPENDS_TERMINAL_ANY` and the cascade trigger guard, so both
children sat QUEUED forever.
"""


def _submit(client, depends_on=None, any_exit=False):
    body = {"cmd": ["true"], "cwd": "/tmp", "project": "project-a"}
    if depends_on is not None:
        body["depends_on"] = depends_on
    if any_exit:
        body["depends_on_any_exit"] = True
    return client.post("/submit", json=body)


def _heartbeat(client, host="w1"):
    client.post(
        "/heartbeat",
        json={
            "host": host,
            "free_vram_gb": 0,
            "unregistered_vram_gb": 0,
            "free_ram_gb": 8,
            "idle_cpus": 4,
            "arch": "x86_64",
            "os": "linux",
            "gpu": False,
            "tags": [],
            "host_aliases": [],
        },
    )


def _next_job(client, host="w1"):
    return client.post(
        "/next-job",
        json={
            "host": host,
            "free_vram_gb": 0,
            "unregistered_vram_gb": 0,
            "free_ram_gb": 8,
            "idle_cpus": 4,
        },
    )


def _expire_parent_to_scheduling_timeout(client, parent_id):
    """Backdate the parent's submitted_at past a 1s scheduling_timeout_s and
    sweep, so the sweeper transitions it to scheduling_timeout."""
    from datetime import UTC, datetime, timedelta

    from sqlalchemy import update

    from jobd.db import Job

    engine = client.app.state.engine
    with engine.begin() as conn:
        conn.execute(
            update(Job)
            .where(Job.id == parent_id)
            .values(
                scheduling_timeout_s=1,
                submitted_at=datetime.now(UTC).replace(tzinfo=None) - timedelta(seconds=60),
            )
        )
    client.app.state.sweep_once()


def test_scheduling_timeout_parent_unblocks_any_exit_child(client):
    parent = _submit(client).json()
    child = _submit(client, depends_on=[parent["id"]], any_exit=True).json()

    _expire_parent_to_scheduling_timeout(client, parent["id"])

    assert client.get(f"/jobs/{parent['id']}").json()["state"] == "scheduling_timeout"
    row = client.get(f"/jobs/{child['id']}").json()
    assert row["state"] == "queued"
    # depends_on_any_exit=True: the terminal parent satisfies deps, so the
    # matcher dispatches the child.
    _heartbeat(client)
    claim = _next_job(client).json()
    assert claim["id"] == child["id"]


def test_scheduling_timeout_parent_cascade_cancels_default_child(client):
    parent = _submit(client).json()
    child = _submit(client, depends_on=[parent["id"]]).json()

    _expire_parent_to_scheduling_timeout(client, parent["id"])
    assert client.get(f"/jobs/{parent['id']}").json()["state"] == "scheduling_timeout"

    # Default-policy child: the parent never produced its output, so the SWEEP
    # itself must cascade-cancel it — no manual _cascade call (audit 2026-07-01
    # H2). Before the fix this path skipped the cascade and the child stranded
    # in QUEUED forever.
    row = client.get(f"/jobs/{child['id']}").json()
    assert row["state"] == "cancelled", row
    assert "parent_failed" in (row.get("warning") or "")


def test_scheduling_timeout_cascade_is_transitive(client):
    """A<-B<-C chain: parent A times out, so B cancels, and B's cancellation
    must transitively cancel C (audit 2026-07-01 H2 — the old single-level
    cascade stranded C in QUEUED forever)."""
    a = _submit(client).json()
    b = _submit(client, depends_on=[a["id"]]).json()
    c = _submit(client, depends_on=[b["id"]]).json()

    _expire_parent_to_scheduling_timeout(client, a["id"])

    assert client.get(f"/jobs/{a['id']}").json()["state"] == "scheduling_timeout"
    assert client.get(f"/jobs/{b['id']}").json()["state"] == "cancelled"
    assert client.get(f"/jobs/{c['id']}").json()["state"] == "cancelled"