Add Eurostar Plus prices and NR advance fare support

- Eurostar scraper now fetches both Standard and Plus (PLUS class code)
  prices/seats in a single API call; each service dict gains plus_price
  and plus_seats fields
- GWR fares scraper gains fetch_advance() which makes two sets of
  paginated calls (standard advance + first-class advance) and returns
  cheapest per departure; shared _run_pages() generator reduces
  duplication in fetch()
- New /api/advance_fares/<station_crs>/<travel_date> endpoint returns
  advance fares as JSON, cached for 24 hours
- Results page gains NR ticket selector (Walk-on / Std Advance / 1st
  Advance) and Eurostar selector (Standard / Plus); total column is
  JS-computed from the selected combination with cheapest/priciest
  highlighting
- Load advance prices button fetches the API lazily; if advance fares
  are already cached they are embedded in the page and applied on load
  so the button is hidden automatically

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/results.html

@@ -95,6 +95,28 @@
 
 {% if trips or unreachable_morning_services %}
 <div class="card">
+  {% if trips %}
+  <div class="filter-row" style="margin-bottom:0.75rem;margin-top:0">
+    <div>
+      <label for="nr-type-select" class="filter-label">NR ticket:</label>
+      <select id="nr-type-select" class="select-inline" onchange="updatePrices()">
+        <option value="walkon">Walk-on</option>
+        <option value="advanceStd" disabled>Std Advance</option>
+        <option value="advanceFirst" disabled>1st Class Advance</option>
+      </select>
+    </div>
+    <div>
+      <label for="es-type-select" class="filter-label">Eurostar:</label>
+      <select id="es-type-select" class="select-inline" onchange="updatePrices()">
+        <option value="esStd">Standard</option>
+        <option value="esPlus">Plus</option>
+      </select>
+    </div>
+    <button id="load-advance-btn" class="btn-secondary" onclick="loadAdvanceFares()">
+      Load advance prices
+    </button>
+  </div>
+  {% endif %}
   <table class="results-table">
     <thead>
       <tr>
@@ -108,11 +130,6 @@
       {% if trips %}
       {% set best_mins = trips | map(attribute='total_minutes') | min %}
       {% set worst_mins = trips | map(attribute='total_minutes') | max %}
-      {% set priced_trips = trips | selectattr('total_price') | list %}
-      {% if priced_trips | length > 1 %}
-        {% set min_price = priced_trips | map(attribute='total_price') | min %}
-        {% set max_price = priced_trips | map(attribute='total_price') | max %}
-      {% endif %}
       {% endif %}
       {% for row in result_rows %}
       {% if row.row_type == 'trip' and row.total_minutes <= best_mins + 5 and trips | length > 1 %}
@@ -126,7 +143,16 @@
       {% else %}
         {% set row_class = '' %}
       {% endif %}
-      <tr class="{{ row_class }}">
+      <tr class="{{ row_class }}"
+        {% if row.row_type == 'trip' %}
+          data-depart="{{ row.depart_bristol }}"
+          data-walkon="{{ row.ticket_price if row.ticket_price is not none else '' }}"
+          data-advance-std=""
+          data-advance-first=""
+          data-es-std="{{ row.eurostar_price if row.eurostar_price is not none else '' }}"
+          data-es-plus="{{ row.eurostar_plus_price if row.eurostar_plus_price is not none else '' }}"
+        {% endif %}
+      >
         {% if row.row_type == 'trip' %}
         <td>
           <span class="font-bold nowrap">{{ row.depart_bristol }} &rarr; {{ row.arrive_paddington }}</span>
@@ -144,6 +170,12 @@
           {% else %}
             <br><span class="text-sm text-muted">&ndash;</span>
           {% endif %}
+          <span class="nr-advance-std-display" style="display:none">
+            <br><span class="text-xs text-muted">Adv std: </span><span class="text-sm nr-advance-std-text"></span>
+          </span>
+          <span class="nr-advance-first-display" style="display:none">
+            <br><span class="text-xs text-muted">Adv 1st: </span><span class="text-sm nr-advance-first-text"></span>
+          </span>
         </td>
         <td class="col-transfer" style="color:#4a5568">
           <span class="nowrap">{{ row.connection_duration }}{% if row.connection_minutes < 80 %} <span title="Tight connection">⚠️</span>{% endif %}</span>
@@ -167,12 +199,14 @@
           {% endif %}
           {% if row.eurostar_price is not none %}
             <br><span class="text-sm font-bold">£{{ "%.2f"|format(row.eurostar_price) }}</span>
-            {% if row.eurostar_seats is not none %}
-              <span class="text-xs text-muted">{{ row.eurostar_seats }} at this price</span>
-            {% endif %}
+            <span class="text-xs text-muted">Std{% if row.eurostar_seats is not none %} &middot; {{ row.eurostar_seats }}{% endif %}</span>
           {% else %}
             <br><span class="text-sm text-muted">&ndash;</span>
           {% endif %}
+          {% if row.eurostar_plus_price is not none %}
+            <br><span class="text-sm">£{{ "%.2f"|format(row.eurostar_plus_price) }}</span>
+            <span class="text-xs text-muted">Plus{% if row.eurostar_plus_seats is not none %} &middot; {{ row.eurostar_plus_seats }}{% endif %}</span>
+          {% endif %}
         </td>
         <td class="font-bold nowrap">
           {% if row.total_minutes <= best_mins + 5 and trips | length > 1 %}
@@ -182,9 +216,7 @@
           {% else %}
             <span class="text-blue">{{ row.total_duration }}</span>
           {% endif %}
-          {% if row.total_price is not none %}
-            <br><span class="text-sm text-green" style="font-weight:700">£{{ "%.2f"|format(row.total_price) }}{% if min_price is defined and max_price is defined %}{% if row.total_price <= min_price + 10 %} <span title="Cheapest journey">🪙</span>{% elif row.total_price >= max_price - 10 %} <span title="Most expensive journey">💸</span>{% endif %}{% endif %}</span>
-          {% endif %}
+          <span class="total-price-span"></span>
         </td>
         {% else %}
         <td>
@@ -202,12 +234,14 @@
           {% endif %}
           {% if row.eurostar_price is not none %}
             <br><span class="text-sm text-dimmed">£{{ "%.2f"|format(row.eurostar_price) }}</span>
-            {% if row.eurostar_seats is not none %}
-              <span class="text-xs text-dimmed">{{ row.eurostar_seats }} at this price</span>
-            {% endif %}
+            <span class="text-xs text-dimmed">Std{% if row.eurostar_seats is not none %} &middot; {{ row.eurostar_seats }}{% endif %}</span>
           {% else %}
             <br><span class="text-sm text-dimmed">&ndash;</span>
           {% endif %}
+          {% if row.eurostar_plus_price is not none %}
+            <br><span class="text-sm text-dimmed">£{{ "%.2f"|format(row.eurostar_plus_price) }}</span>
+            <span class="text-xs text-dimmed">Plus{% if row.eurostar_plus_seats is not none %} &middot; {{ row.eurostar_plus_seats }}{% endif %}</span>
+          {% endif %}
         </td>
         <td class="text-dimmed">&mdash;</td>
         {% endif %}
@@ -221,7 +255,7 @@
   Paddington &rarr; St&nbsp;Pancras connection: {{ min_connection }}&ndash;{{ max_connection }}&nbsp;min.
   GWR walk-on single prices from
   <a href="https://www.gwr.com/" target="_blank" rel="noopener">gwr.com</a>.
-  Eurostar Standard prices are for 1 adult in GBP; always check
+  Eurostar Standard and Plus prices are for 1 adult in GBP; always check
   <a href="{{ eurostar_url }}" target="_blank" rel="noopener">eurostar.com</a> to book.
   &nbsp;&middot;&nbsp;
   <a href="{{ rtt_station_url }}" target="_blank" rel="noopener">{{ departure_station_name }} departures on RTT</a>
@@ -229,6 +263,117 @@
   <a href="{{ rtt_url }}" target="_blank" rel="noopener">Paddington arrivals on RTT</a>
 </p>
 
+<script>
+var stationCrs = {{ station_crs | tojson }};
+var travelDate = {{ travel_date | tojson }};
+var cachedAdvanceFares = {{ cached_advance_fares | tojson }};
+
+function updatePrices() {
+  var nrSel = document.getElementById('nr-type-select').value;
+  var esSel = document.getElementById('es-type-select').value;
+  var rows = document.querySelectorAll('tr[data-depart]');
+  var validTotals = [];
+
+  rows.forEach(function(row) {
+    var nrVal = row.dataset[nrSel];
+    var esVal = row.dataset[esSel];
+    var totalSpan = row.querySelector('.total-price-span');
+    if (!totalSpan) return;
+
+    var nrPrice = nrVal !== '' && nrVal !== undefined ? parseFloat(nrVal) : null;
+    var esPrice = esVal !== '' && esVal !== undefined ? parseFloat(esVal) : null;
+
+    if (nrPrice !== null && esPrice !== null) {
+      var total = nrPrice + esPrice;
+      totalSpan.dataset.total = total;
+      validTotals.push(total);
+    } else {
+      delete totalSpan.dataset.total;
+      totalSpan.innerHTML = '';
+    }
+  });
+
+  var minTotal = validTotals.length ? Math.min.apply(null, validTotals) : null;
+  var maxTotal = validTotals.length ? Math.max.apply(null, validTotals) : null;
+
+  rows.forEach(function(row) {
+    var totalSpan = row.querySelector('.total-price-span');
+    if (!totalSpan || !('total' in totalSpan.dataset)) return;
+    var total = parseFloat(totalSpan.dataset.total);
+    var html = '<br><span class="text-sm text-green" style="font-weight:700">£' + total.toFixed(2);
+    if (minTotal !== null && maxTotal !== null && validTotals.length > 1) {
+      if (total <= minTotal + 10) html += ' <span title="Cheapest journey">\uD83E\uDE99</span>';
+      else if (total >= maxTotal - 10) html += ' <span title="Most expensive journey">\uD83D\uDCB8</span>';
+    }
+    html += '</span>';
+    totalSpan.innerHTML = html;
+  });
+}
+
+function loadAdvanceFares() {
+  var btn = document.getElementById('load-advance-btn');
+  btn.disabled = true;
+  btn.textContent = 'Loading\u2026';
+
+  fetch('/api/advance_fares/' + stationCrs + '/' + travelDate)
+    .then(function(r) { return r.json(); })
+    .then(function(data) {
+      if (data.error) {
+        btn.textContent = 'Error';
+        btn.disabled = false;
+        return;
+      }
+      applyAdvanceFares(data);
+      updatePrices();
+    })
+    .catch(function() {
+      btn.textContent = 'Error \u2014 try again';
+      btn.disabled = false;
+    });
+}
+
+function applyAdvanceFares(data) {
+  var hasStd = false, hasFirst = false;
+  document.querySelectorAll('tr[data-depart]').forEach(function(row) {
+    var dep = row.dataset.depart;
+    var fares = data[dep];
+    if (!fares) return;
+    if (fares.advance_std) {
+      row.dataset.advanceStd = fares.advance_std.price;
+      var span = row.querySelector('.nr-advance-std-display');
+      var text = row.querySelector('.nr-advance-std-text');
+      if (span && text) {
+        text.textContent = '\u00a3' + fares.advance_std.price.toFixed(2) + ' ' + fares.advance_std.ticket;
+        span.style.display = '';
+      }
+      hasStd = true;
+    }
+    if (fares.advance_1st) {
+      row.dataset.advanceFirst = fares.advance_1st.price;
+      var span1 = row.querySelector('.nr-advance-first-display');
+      var text1 = row.querySelector('.nr-advance-first-text');
+      if (span1 && text1) {
+        text1.textContent = '\u00a3' + fares.advance_1st.price.toFixed(2) + ' ' + fares.advance_1st.ticket;
+        span1.style.display = '';
+      }
+      hasFirst = true;
+    }
+  });
+  var nrSelect = document.getElementById('nr-type-select');
+  if (nrSelect) {
+    if (hasStd) nrSelect.querySelector('[value="advanceStd"]').disabled = false;
+    if (hasFirst) nrSelect.querySelector('[value="advanceFirst"]').disabled = false;
+  }
+  var btn = document.getElementById('load-advance-btn');
+  if (btn) btn.style.display = 'none';
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+  if (cachedAdvanceFares) applyAdvanceFares(cachedAdvanceFares);
+  updatePrices();
+});
+</script>
+
 {% else %}
 <div class="card empty-state">
   <p>No valid journeys found.</p>