"""A progress checkpoint takes a FINITE position.

The JSON parser under FastAPI accepts `Infinity` and `NaN`, and both progress handlers truncate the
position with `int()` — so one hand-written checkpoint came back as a 500 with a traceback. Found in
the 2026-09 bug hunt's second review round, as the sibling of the subtitle routes' non-finite
`at`/`offset`. Pure: the body is refused before the handler touches the database.
"""

from types import SimpleNamespace

import pytest
from fastapi.testclient import TestClient

import app.state as app_state
from app.auth import current_user
from app.main import app


@pytest.fixture
def client(monkeypatch, override_dep) -> TestClient:
    override_dep(current_user, lambda: SimpleNamespace(id=1))
    monkeypatch.setattr(app_state, "_configured_cache", True)  # pass the instance-setup gate, no DB
    return TestClient(app)


@pytest.mark.parametrize("path", ["/api/videos/v1/progress", "/api/plex/item/98614/progress"])
@pytest.mark.parametrize("raw", ["Infinity", "-Infinity", "NaN"])
def test_a_non_finite_position_is_refused(client, path, raw):
    r = client.post(
        path,
        content=f'{{"position_seconds": {raw}, "duration_seconds": 3000}}',
        headers={"content-type": "application/json"},
    )
    assert r.status_code == 422, r.text


@pytest.mark.parametrize("path", ["/api/videos/v1/progress", "/api/plex/item/98614/progress"])
@pytest.mark.parametrize("field", ["position_seconds", "duration_seconds"])
def test_a_position_past_the_int4_column_is_refused_not_a_500(client, path, field):
    """Finite but past the int4 column: the flush was a DataError, i.e. a 500 with a traceback."""
    body = {"position_seconds": 10, "duration_seconds": 3000, field: 2**31}
    assert client.post(path, json=body).status_code == 422


def test_the_refusal_keeps_the_shape_the_ui_reads(client):
    """The handler replaces FastAPI's own for every validation error in the app, and the UI turns
    exactly this shape — a LIST of errors — into its localized "check your input" sentence. The
    refused value is echoed by its name, because JSON cannot carry NaN."""
    r = client.post(
        "/api/videos/v1/progress",
        content='{"position_seconds": NaN, "duration_seconds": 3000}',
        headers={"content-type": "application/json"},
    )
    detail = r.json()["detail"]
    assert isinstance(detail, list) and detail[0]["loc"] == ["body", "position_seconds"]
    assert detail[0]["input"] == "nan"


@pytest.mark.parametrize("q", ["start=inf", "start=nan", "aoff=inf", "aoff=-inf", "aoff=nan"])
def test_a_session_at_an_impossible_offset_is_refused(client, q):
    """`start=inf` reached `int()` in the session builder (a 500); `aoff=inf` spawned an ffmpeg
    with a non-finite offset."""
    assert client.post(f"/api/plex/stream/98614/session?{q}").status_code == 422