from datetime import datetime

from app.core.datetime import unix_ms_utc, utc_now
from app.schemas import EventCreate, EventResponse, EspTimeResponse


def test_event_input_datetime_is_normalized_to_utc_naive() -> None:
    event = EventCreate(
        title="Evening briefing",
        event_date="2026-06-01T19:30:00+01:00",
        event_time=None,
    )

    assert event.event_date == datetime(2026, 6, 1, 18, 30)
    assert event.event_date.tzinfo is None


def test_response_datetimes_serialize_as_zulu() -> None:
    event = EventResponse(
        id=1,
        title="Evening briefing",
        description=None,
        event_date=datetime(2026, 6, 1, 18, 30),
        event_time=None,
        location=None,
        max_attendees=None,
        status="draft",
        created_by=1,
        created_at=datetime(2026, 5, 1, 10, 0),
        updated_at=datetime(2026, 5, 1, 10, 0),
    )

    payload = event.model_dump_json()

    assert '"event_date":"2026-06-01T18:30:00Z"' in payload
    assert '"created_at":"2026-05-01T10:00:00Z"' in payload


def test_esp_time_uses_same_utc_instant_for_iso_and_unix_ms() -> None:
    now = utc_now()
    response = EspTimeResponse(
        server_time_utc=now,
        unix_ms=unix_ms_utc(now),
    )

    assert '"server_time_utc":"' in response.model_dump_json()
    assert response.unix_ms == unix_ms_utc(now)