"""DB-backed regression for the 0.53.1 hotfix (R6 S3b-test): GET /api/plex/facets?scope=show
must return 200 — not the "cannot extract elements from a scalar" 500 — for a metadata-poor
library whose show has a JSONB-scalar `null` genres (a pre-0.53.1 row). The endpoint's
`jsonb_typeof(genres)='array'` read-guard is what makes it safe; this test would 500 without it.

Uses the DB lane (`db` fixture) — skipped when no Postgres is reachable.
"""
from fastapi.testclient import TestClient
from sqlalchemy import text

import app.state as state
from app.auth import current_user
from app.db import get_db
from app.main import app
from app.models import PlexLibrary, PlexShow, User


def test_facets_survives_json_null_genres(db, monkeypatch):
    lib = PlexLibrary(plex_key="1", title="Shows", kind="show", enabled=True)
    db.add(lib)
    db.flush()
    db.add(PlexShow(rating_key="s1", library_id=lib.id, title="No Genre Show"))
    user = User(email="facets@example.com")
    db.add(user)
    db.commit()
    # The request gate 503s an unconfigured instance; flip the process-level "configured" flag the
    # gate reads. monkeypatch auto-restores it, so it can't leak "configured" into another test.
    monkeypatch.setattr(state, "_configured_cache", True)
    # Simulate a pre-0.53.1 row: genres persisted as a JSONB scalar `null` (what SQLAlchemy wrote
    # before none_as_null=True), NOT SQL NULL — this is the value jsonb_array_elements_text() chokes
    # on. A Python None now maps to SQL NULL, so we set the scalar directly.
    db.execute(text("UPDATE plex_shows SET genres = 'null'::jsonb WHERE rating_key = 's1'"))
    db.commit()

    app.dependency_overrides[get_db] = lambda: db
    app.dependency_overrides[current_user] = lambda: user
    try:
        client = TestClient(app)  # no context-manager: skip lifespan (scheduler/HLS sweep)
        resp = client.get("/api/plex/facets?scope=show")
    finally:
        app.dependency_overrides.clear()

    assert resp.status_code == 200, resp.text
    # The scalar-null show contributes no genres — and, crucially, doesn't abort the whole endpoint.
    assert resp.json()["genres"] == []