from datetime import datetime, timezone

from fastapi.testclient import TestClient


class _FakeScheduler:
    def __init__(self, next_tick=None) -> None:
        self.last_tick = None
        self.next_tick = next_tick


def test_login_page_shows_next_sync_time(app, client: TestClient) -> None:
    next_tick = datetime(2026, 8, 16, 14, 32, tzinfo=timezone.utc)
    app.state.scheduler = _FakeScheduler(next_tick=next_tick)

    response = client.get("/login")

    assert response.status_code == 200
    assert 'data-utc="2026-08-16T14:32:00+00:00"' in response.text


def test_dashboard_shows_next_sync_time(app, authenticated_client) -> None:
    next_tick = datetime(2026, 8, 16, 15, 0, tzinfo=timezone.utc)
    app.state.scheduler = _FakeScheduler(next_tick=next_tick)

    response = authenticated_client.get("/")

    assert response.status_code == 200
    assert 'data-utc="2026-08-16T15:00:00+00:00"' in response.text


def test_login_page_renders_without_scheduler(client: TestClient) -> None:
    response = client.get("/login")

    assert response.status_code == 200
    assert "data-utc" not in response.text