from datetime import datetime

import app as app_module
import trip_planner as trip_planner_module


def _client():
    app_module.app.config['TESTING'] = True
    return app_module.app.test_client()


def _stub_data(monkeypatch, prices=None, gwr_fares=None):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda station_crs, travel_date: gwr_fares or {'07:00': {'ticket': 'Anytime Day Single', 'price': 138.70, 'code': 'SDS'}},
    )
    p = (prices or {}).get('10:01', {})
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {
                'depart_st_pancras': '10:01',
                'arrive_destination': '13:34',
                'destination': destination,
                'train_number': 'ES 9014',
                'price': p.get('price') if isinstance(p, dict) else None,
                'seats': p.get('seats') if isinstance(p, dict) else None,
                'plus_price': p.get('plus_price') if isinstance(p, dict) else None,
                'plus_seats': p.get('plus_seats') if isinstance(p, dict) else None,
            },
        ],
    )


def test_index_shows_station_dropdown_and_destination_radios():
    client = _client()

    resp = client.get('/')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Departure point' in html
    assert 'Bristol Temple Meads' in html
    assert 'name="station_crs"' in html
    assert html.count('type="radio"') == len(app_module.DESTINATIONS)
    assert 'destination-rotterdam' in html


def test_search_redirects_to_results_with_selected_params():
    client = _client()

    resp = client.get('/search?destination=rotterdam&travel_date=2026-04-10&min_connection=60&max_connection=120&station_crs=BRI')

    assert resp.status_code == 302
    assert resp.headers['Location'].endswith(
        '/results/BRI/rotterdam/2026-04-10?min_connection=60&max_connection=120'
    )


def test_search_redirects_return_with_return_date():
    client = _client()

    resp = client.get('/search?journey_type=return&destination=paris&travel_date=2026-04-10&return_date=2026-04-17&station_crs=BRI')

    assert resp.status_code == 302
    assert resp.headers['Location'].endswith(
        '/results/BRI/paris/2026-04-10/return/2026-04-17'
    )


def test_nr_weekday_cache_key_includes_timetable_period():
    key = app_module._nr_weekday_cache_key("to_paddington", "BRI", "2026-06-22")

    assert key == "weekday_rtt_to_paddington_BRI_2026-05-17_2026-12-12_mon"


def test_results_shows_same_day_destination_switcher(monkeypatch):
    _stub_data(monkeypatch)
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Switch destination for Friday 10 April 2026' in html
    assert '<span class="chip-current">Paris Gare du Nord</span>' in html
    assert '/results/BRI/brussels/2026-04-10?min_connection=60&amp;max_connection=120' in html
    assert '/results/BRI/rotterdam/2026-04-10?min_connection=60&amp;max_connection=120' in html
    assert 'ES 9014' in html


def test_results_can_render_from_weekday_timetable_cache(monkeypatch):
    travel_date = "2026-06-22"
    cache = {
        app_module._nr_weekday_cache_key("to_paddington", "BRI", travel_date): [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
        app_module._eurostar_weekday_cache_key("outbound", travel_date, "Paris Gare du Nord"): [
            {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
             'destination': 'Paris Gare du Nord', 'train_number': 'ES 9014'},
        ],
    }
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: cache.get(key))
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda *args, **kwargs: (_ for _ in ()).throw(AssertionError("should use weekday NR cache")),
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda *args, **kwargs: (_ for _ in ()).throw(AssertionError("should use weekday Eurostar cache")),
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda *args, **kwargs: (_ for _ in ()).throw(AssertionError("should stream prices later")),
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-06-22?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '07:00 &rarr; 08:45' in html
    assert '10:01 &rarr; 13:34' in html
    assert 'ES 9014' in html
    assert 'checking exact timetable' in html
    assert '/api/results_refresh/BRI/paris/2026-06-22' in html
    assert 'refreshFullResults()' in html
    assert 'window.location.reload()' not in html


def test_results_refresh_reloads_when_exact_timetable_differs(monkeypatch):
    travel_date = "2026-06-22"
    cache = {
        app_module._nr_weekday_cache_key("to_paddington", "BRI", travel_date): [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
        app_module._eurostar_weekday_cache_key("outbound", travel_date, "Paris Gare du Nord"): [
            {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
             'destination': 'Paris Gare du Nord', 'train_number': 'ES 9014'},
        ],
    }
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: cache.get(key))
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: cache.__setitem__(key, data))
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:05', 'arrive_paddington': '08:50', 'headcode': '1A24'},
        ],
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
             'destination': destination, 'train_number': 'ES 9014',
             'price': 59, 'seats': 42, 'plus_price': 89, 'plus_seats': 5},
        ],
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda *args, **kwargs: (_ for _ in ()).throw(AssertionError("reload should stop before fare fetch")),
    )
    client = _client()

    resp = client.get('/api/results_refresh/BRI/paris/2026-06-22')
    body = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '"type": "reload"' in body
    assert cache[app_module._nr_exact_cache_key("to_paddington", "BRI", travel_date)][0]['depart_bristol'] == '07:05'
    assert cache[app_module._nr_weekday_cache_key("to_paddington", "BRI", travel_date)][0]['depart_bristol'] == '07:05'


def test_results_refresh_streams_prices_when_timetable_matches(monkeypatch):
    travel_date = "2026-06-22"
    nr_timetable = [
        {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
    ]
    es_timetable = [
        {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
         'destination': 'Paris Gare du Nord', 'train_number': 'ES 9014'},
    ]
    cache = {
        app_module._nr_weekday_cache_key("to_paddington", "BRI", travel_date): nr_timetable,
        app_module._eurostar_weekday_cache_key("outbound", travel_date, "Paris Gare du Nord"): es_timetable,
    }
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: cache.get(key))
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: cache.__setitem__(key, data))
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': nr_timetable,
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {**es_timetable[0], 'price': 59, 'seats': 42, 'plus_price': 89, 'plus_seats': 5},
        ],
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda station_crs, travel_date: {
            '07:00': {'ticket': 'Anytime Day Single', 'price': 138.70, 'code': 'SDS'},
        },
    )
    client = _client()

    resp = client.get('/api/results_refresh/BRI/paris/2026-06-22')
    body = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '"type": "reload"' not in body
    assert '"type": "eurostar_prices"' in body
    assert '"main:10:01"' in body
    assert '"price": 59' in body
    assert '"type": "walkon_fares"' in body
    assert '"price": 138.7' in body


def test_results_progressive_shell_loads_without_scraping(monkeypatch):
    def fail_fetch(*args, **kwargs):
        raise AssertionError("progressive shell should not fetch data")

    monkeypatch.setattr(app_module.rtt_scraper, 'fetch', fail_fetch)
    monkeypatch.setattr(app_module.eurostar_scraper, 'fetch', fail_fetch)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', fail_fetch)
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?progressive=1')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Loading train times and fares' in html
    assert 'render=full' in html


def test_return_progressive_shell_formats_return_date(monkeypatch):
    def fail_fetch(*args, **kwargs):
        raise AssertionError("progressive shell should not fetch data")

    monkeypatch.setattr(app_module.rtt_scraper, 'fetch', fail_fetch)
    monkeypatch.setattr(app_module.eurostar_scraper, 'fetch_return', fail_fetch)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', fail_fetch)
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10/return/2026-04-17?progressive=1')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Friday 10 April 2026 to Friday 17 April 2026' in html
    assert 'to 2026-04-17' not in html


def test_results_title_and_social_meta_include_destination(monkeypatch):
    _stub_data(monkeypatch)
    client = _client()

    resp = client.get('/results/BRI/lille/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '<title>Bristol Temple Meads to Lille Europe via Eurostar</title>' in html
    assert '<meta property="og:title" content="Bristol Temple Meads to Lille Europe via Eurostar">' in html
    assert (
        '<meta property="og:description" content="Train options from Bristol Temple Meads '
        'to Lille Europe on Friday 10 April 2026 via Paddington, St Pancras, and Eurostar.">'
    ) in html
    assert '<meta property="og:url" content="http://localhost/results/BRI/lille/2026-04-10?min_connection=60&amp;max_connection=120">' in html


def test_results_marks_trips_within_five_minutes_of_fastest_and_slowest(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', lambda s, d: {})
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:30', 'headcode': '1A01'},
            {'depart_bristol': '07:05', 'arrive_paddington': '08:36', 'headcode': '1A02'},
            {'depart_bristol': '07:10', 'arrive_paddington': '08:46', 'headcode': '1A03'},
            {'depart_bristol': '07:15', 'arrive_paddington': '08:56', 'headcode': '1A04'},
            {'depart_bristol': '07:20', 'arrive_paddington': '09:06', 'headcode': '1A05'},
        ],
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '09:30', 'arrive_destination': '11:50', 'destination': destination, 'train_number': 'ES 1001', 'price': None, 'seats': None},
            {'depart_st_pancras': '09:40', 'arrive_destination': '12:00', 'destination': destination, 'train_number': 'ES 1002', 'price': None, 'seats': None},
            {'depart_st_pancras': '09:50', 'arrive_destination': '12:20', 'destination': destination, 'train_number': 'ES 1003', 'price': None, 'seats': None},
            {'depart_st_pancras': '10:00', 'arrive_destination': '12:35', 'destination': destination, 'train_number': 'ES 1004', 'price': None, 'seats': None},
            {'depart_st_pancras': '10:10', 'arrive_destination': '12:45', 'destination': destination, 'train_number': 'ES 1005', 'price': None, 'seats': None},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert html.count('title="Fastest journey"') == 2
    assert html.count('title="Slowest journey"') == 2
    assert '4h 50m ⚡' in html
    assert '4h 55m ⚡' in html
    assert '5h 20m 🐢' in html
    assert '5h 25m 🐢' in html
    assert '5h 10m ⚡' not in html
    assert '5h 10m 🐢' not in html


def test_results_shows_only_pre_first_reachable_unreachable_services(monkeypatch):
    # GWR arrives 08:45; min=60 → earliest viable Eurostar 09:45; max=120 → latest 10:45.
    # 09:30 too early → shown as "Too early"
    # 10:15 reachable → shown as a trip (needs circle line XML, so not tested here)
    # 12:30 after first reachable → hidden
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', lambda s, d: {})
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '09:30', 'arrive_destination': '12:00', 'destination': destination, 'train_number': 'ES 9001', 'price': None, 'seats': None},
            {'depart_st_pancras': '10:15', 'arrive_destination': '13:40', 'destination': destination, 'train_number': 'ES 9002', 'price': None, 'seats': None},
            {'depart_st_pancras': '12:30', 'arrive_destination': '15:55', 'destination': destination, 'train_number': 'ES 9003', 'price': None, 'seats': None},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'ES 9001' in html       # before first reachable → shown
    assert 'Too early' in html
    assert 'ES 9003' not in html   # after first reachable → hidden


def test_results_shows_eurostar_price_and_total(monkeypatch):
    # 07:00 on Friday 2026-04-10 → Anytime £138.70 walk-on + ES £59.00
    _stub_data(monkeypatch, prices={'10:01': {'price': 59, 'seats': 42}})
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '£59' in html                    # Eurostar Standard price
    assert '£138.70' in html               # Walk-on price shown in NR cell
    # Total (£197.70) is computed client-side; verify data attributes carry the right values
    assert 'data-walkon="138.7"' in html
    assert 'data-es-std="59"' in html


def test_results_uses_unique_row_keys_for_same_eurostar(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', lambda s, d: {
        '07:00': {'ticket': 'Anytime Day Single', 'price': 138.70, 'code': 'SDS'},
        '07:30': {'ticket': 'Anytime Day Single', 'price': 138.70, 'code': 'SDS'},
    })
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:30', 'headcode': '1A01'},
            {'depart_bristol': '07:30', 'arrive_paddington': '09:00', 'headcode': '1A02'},
        ],
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
             'destination': destination, 'train_number': 'ES 9014',
             'price': 59, 'seats': 42, 'plus_price': 89, 'plus_seats': 5},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'data-row-key="main:07:00:10:01"' in html
    assert 'data-row-key="main:07:30:10:01"' in html
    assert '"main:07:00:10:01"' in html
    assert '"main:07:30:10:01"' in html


def test_results_shows_unreachable_service_when_no_trips(monkeypatch):
    # Only one Eurostar at 09:30; GWR arrives 08:45 with min=60 → unreachable.
    # No trips at all, so the unreachable service is shown as "Too early".
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', lambda s, d: {})
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '09:30', 'arrive_destination': '12:00', 'destination': destination, 'train_number': 'ES 9001', 'price': None, 'seats': None},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'ES 9001' in html
    assert 'Too early' in html
    assert 'No valid journeys found.' not in html


def test_results_shows_eurostar_plus_price(monkeypatch):
    _stub_data(monkeypatch, prices={'10:01': {'price': 59, 'seats': 42, 'plus_price': 89, 'plus_seats': 5}})
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert '£59' in html       # Standard price
    assert '£89' in html       # Plus price
    assert 'Plus' in html      # Plus label


def test_results_selectors_present(monkeypatch):
    _stub_data(monkeypatch)
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'nr-type-select' in html
    assert 'es-type-select' in html
    assert 'Load advance prices' in html
    assert 'Plus' in html


def test_results_preloads_cached_advance_fares(monkeypatch):
    advance_data = {
        '07:00': {
            'advance_std': {'ticket': 'Advance Single', 'price': 45.0, 'code': 'ADV'},
            'advance_1st': None,
        }
    }
    def fake_get_cached(key, ttl=None):
        if 'gwr_advance' in key:
            return advance_data
        return None
    monkeypatch.setattr(app_module, 'get_cached', fake_get_cached)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.rtt_scraper, 'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
    )
    monkeypatch.setattr(app_module.gwr_fares_scraper, 'fetch', lambda s, d: {})
    monkeypatch.setattr(
        app_module.eurostar_scraper, 'fetch',
        lambda destination, travel_date: [
            {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
             'destination': destination, 'train_number': 'ES 9014',
             'price': None, 'seats': None, 'plus_price': None, 'plus_seats': None},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?min_connection=60&max_connection=120')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    # Cached advance fares are embedded in the page JS
    assert '"advance_std"' in html
    assert '45.0' in html
    # Button is absent (hidden via cachedAdvanceFares check in JS)
    # The JS will hide it on load; the data is present for applyAdvanceFares()
    assert 'cachedAdvanceFares' in html


def test_results_inbound_uses_reverse_legs(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch_from_paddington',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_paddington': '17:15', 'arrive_destination': '18:55', 'headcode': '1B99'},
        ],
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda station_crs, travel_date, direction='to_paddington': {
            '17:15': {'ticket': 'Off-Peak Single', 'price': 63.60, 'code': 'SVS'}
        },
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch',
        lambda destination, travel_date, direction='outbound': [
            {'depart_destination': '15:12', 'arrive_st_pancras': '16:30',
             'destination': destination, 'train_number': 'ES 9035',
             'price': 49, 'seats': 43, 'plus_price': None, 'plus_seats': None},
        ],
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10?journey_type=inbound')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Paris Gare du Nord &rarr; Bristol Temple Meads' in html
    assert '15:12 &rarr; 16:30' in html
    assert '17:15 &rarr; 18:55' in html
    assert 'ES 9035' in html


def test_results_return_renders_outbound_and_inbound_tables(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_bristol': '07:00', 'arrive_paddington': '08:45', 'headcode': '1A23'},
        ],
    )
    monkeypatch.setattr(
        app_module.rtt_scraper,
        'fetch_from_paddington',
        lambda travel_date, user_agent, station_crs='BRI': [
            {'depart_paddington': '17:15', 'arrive_destination': '18:55', 'headcode': '1B99'},
        ],
    )
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch',
        lambda station_crs, travel_date, direction='to_paddington': {
            '07:00': {'ticket': 'Anytime Day Single', 'price': 138.70, 'code': 'SDS'},
            '17:15': {'ticket': 'Off-Peak Single', 'price': 63.60, 'code': 'SVS'},
        },
    )
    monkeypatch.setattr(
        app_module.eurostar_scraper,
        'fetch_return',
        lambda destination, outbound_date, return_date: {
            'outbound': [
                {'depart_st_pancras': '10:01', 'arrive_destination': '13:34',
                 'destination': destination, 'train_number': 'ES 9014',
                 'price': 59, 'seats': 42, 'plus_price': None, 'plus_seats': None},
            ],
            'inbound': [
                {'depart_destination': '15:12', 'arrive_st_pancras': '16:30',
                 'destination': destination, 'train_number': 'ES 9035',
                 'price': 49, 'seats': 43, 'plus_price': None, 'plus_seats': None},
            ],
        },
    )
    monkeypatch.setattr(
        trip_planner_module.circle_line,
        'upcoming_services',
        lambda earliest_board, count=2, direction='pad_to_kx': (
            [
                (datetime(2026, 4, 10, 9, 10), datetime(2026, 4, 10, 9, 25)),
                (datetime(2026, 4, 10, 9, 15), datetime(2026, 4, 10, 9, 30)),
            ]
            if direction == 'pad_to_kx'
            else [
                (datetime(2026, 4, 17, 16, 40), datetime(2026, 4, 17, 16, 55)),
                (datetime(2026, 4, 17, 16, 45), datetime(2026, 4, 17, 17, 0)),
            ]
        ),
    )
    client = _client()

    resp = client.get('/results/BRI/paris/2026-04-10/return/2026-04-17')
    html = resp.get_data(as_text=True)

    assert resp.status_code == 200
    assert 'Outbound: Bristol Temple Meads &rarr; Paris Gare du Nord' in html
    assert 'Return: Paris Gare du Nord &rarr; Bristol Temple Meads' in html
    assert 'Friday 10 April 2026 to Friday 17 April 2026' in html
    assert '/results/BRI/paris/2026-04-09/return/2026-04-16' in html
    assert '/results/BRI/paris/2026-04-11/return/2026-04-18' in html
    assert "/results/BRI/paris/2026-04-10/return/2026-04-17" in html
    assert 'journey_type=return' not in html
    assert 'return_date=2026-04-17' not in html
    assert 'Circle 09:10 &rarr; KX 09:25' in html
    assert 'next 09:15 &rarr; KX 09:30' in html
    assert 'Circle 16:40 &rarr; PAD 16:55' in html
    assert 'next 16:45 &rarr; PAD 17:00' in html
    assert 'title="Tight connection">⚠️</span>' in html
    assert 'ES 9014' in html
    assert 'ES 9035' in html


def test_api_advance_fares_returns_json(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch_advance',
        lambda station_crs, travel_date: {
            '07:00': {
                'advance_std': {'ticket': 'Advance Single', 'price': 45.0, 'code': 'ADV'},
                'advance_1st': {'ticket': '1st Advance', 'price': 65.0, 'code': 'AFA'},
            }
        },
    )
    client = _client()

    resp = client.get('/api/advance_fares/BRI/2026-04-10')
    data = resp.get_json()

    assert resp.status_code == 200
    assert '07:00' in data
    assert data['07:00']['advance_std']['price'] == 45.0
    assert data['07:00']['advance_1st']['price'] == 65.0


def test_api_advance_fares_404_for_unknown_station(monkeypatch):
    client = _client()
    resp = client.get('/api/advance_fares/XYZ/2026-04-10')
    assert resp.status_code == 404


def test_api_advance_fares_returns_error_on_scraper_failure(monkeypatch):
    monkeypatch.setattr(app_module, 'get_cached', lambda key, ttl=None: None)
    monkeypatch.setattr(app_module, 'set_cached', lambda key, data: None)
    monkeypatch.setattr(
        app_module.gwr_fares_scraper,
        'fetch_advance',
        lambda s, d: (_ for _ in ()).throw(Exception('network error')),
    )
    client = _client()

    resp = client.get('/api/advance_fares/BRI/2026-04-10')
    data = resp.get_json()

    assert resp.status_code == 500
    assert 'error' in data