"""Regression tests for GWR update notifications."""

from pathlib import Path
from unittest.mock import Mock, patch

import flask
import pytest

from update import update_gwr_advance_ticket_date


@pytest.mark.parametrize(
    ("response_html", "expect_email"),
    [
        (
            "<p>We are sorry that we cannot show you the page you were looking for. "
            "Our website is extremely busy at the moment.</p>",
            False,
        ),
        (
            "<p>We are sorry that we cannot show you the page you were looking for.\n"
            "Our website is   extremely busy at the moment.</p>",
            False,
        ),
        ("<p>Unexpected response without booking dates.</p>", True),
    ],
    ids=["busy-page", "busy-page-whitespace", "unexpected-page"],
)
def test_gwr_missing_dates_notifications(
    tmp_path: Path, response_html: str, expect_email: bool
) -> None:
    """Only known busy pages skip alerts; failed responses preserve the cache."""
    cached_html = """
    <table>
      <tr><td>Weekdays</td><td>Friday 25 December 2026</td></tr>
      <tr><td>Saturdays</td><td>Saturday 26 December 2026</td></tr>
      <tr><td>Sundays</td><td>Sunday 27 December 2026</td></tr>
    </table>
    """
    cache = tmp_path / "advance-tickets.html"
    cache.write_text(cached_html)
    config = flask.config.Config(str(tmp_path))
    config["DATA_DIR"] = str(tmp_path)

    with (
        patch("update.requests.get", return_value=Mock(text=response_html)),
        patch("update.agenda.mail.send_mail") as send_mail,
    ):
        update_gwr_advance_ticket_date(config)

    if expect_email:
        send_mail.assert_called_once_with(
            config, "Error parsing GWR advance ticket booking dates", response_html
        )
    else:
        send_mail.assert_not_called()
    assert cache.read_text() == cached_html