{% extends "base.html" %}
{% block title %}{% if journey_type == 'inbound' %}{{ destination }} to {{ departure_station_name }} via Eurostar{% elif journey_type == 'return' %}{{ departure_station_name }} to {{ destination }} return via Eurostar{% else %}{{ departure_station_name }} to {{ destination }} via Eurostar{% endif %}{% endblock %}
{% block og_title %}{{ self.title()|trim }}{% endblock %}
{% block og_description %}Train options from {{ departure_station_name }} to {{ destination }} on {{ travel_date_display }} via Paddington, St Pancras, and Eurostar.{% endblock %}
{% block twitter_title %}{{ self.title()|trim }}{% endblock %}
{% block twitter_description %}Train options from {{ departure_station_name }} to {{ destination }} on {{ travel_date_display }} via Paddington, St Pancras, and Eurostar.{% endblock %}
{% block content %}

<p class="back-link">
  <a href="{{ url_for('index') }}">&larr; New search</a>
</p>

<div class="card" style="margin-bottom:1.5rem">
  <h2>
    {% if journey_type == 'inbound' %}
      {{ destination }} &rarr; {{ departure_station_name }}
    {% elif journey_type == 'return' %}
      {{ departure_station_name }} &harr; {{ destination }}
    {% else %}
      {{ departure_station_name }} &rarr; {{ destination }}
    {% endif %}
  </h2>
  {% if journey_type == 'return' %}
  <div class="date-nav">
    <span class="date-nav-label">Outbound:</span>
    <a href="{{ prev_outbound_url }}" class="btn-nav">&larr; Prev</a>
    <strong>{{ travel_date_display }}</strong>
    <a href="{{ next_outbound_url }}" class="btn-nav">Next &rarr;</a>
  </div>
  <div class="date-nav">
    <span class="date-nav-label">Return:</span>
    <a href="{{ prev_return_url }}" class="btn-nav">&larr; Prev</a>
    <strong>{{ return_date_display }}</strong>
    <a href="{{ next_return_url }}" class="btn-nav">Next &rarr;</a>
  </div>
  {% else %}
  <div class="date-nav">
    <a href="{{ prev_results_url }}"
       class="btn-nav">&larr; Prev</a>
    <strong>{{ travel_date_display }}</strong>
    <a href="{{ next_results_url }}"
       class="btn-nav">Next &rarr;</a>
  </div>
  {% endif %}
  <div class="switcher-section">
    <div class="section-label">Switch destination for {{ travel_date_display }}</div>
    <div class="chip-row">
      {% for destination_slug, destination_name, destination_url in destination_links %}
        {% if destination_slug == slug %}
          <span class="chip-current">{{ destination_name }}</span>
        {% else %}
          <a
            class="chip-link"
            href="{{ destination_url }}"
          >{{ destination_name }}</a>
        {% endif %}
      {% endfor %}
    </div>
  </div>
  <div class="filter-row">
    <div>
      <label for="min_conn_select" class="filter-label">Min connection:</label>
      <select id="min_conn_select" onchange="applyConnectionFilter()" class="select-inline">
        {% for mins in valid_min_connections %}
          <option value="{{ mins }}" {% if mins == min_connection %}selected{% endif %}>{{ mins }} min</option>
        {% endfor %}
      </select>
    </div>
    <div>
      <label for="max_conn_select" class="filter-label">Max connection:</label>
      <select id="max_conn_select" onchange="applyConnectionFilter()" class="select-inline">
        {% for mins in valid_max_connections %}
          <option value="{{ mins }}" {% if mins == max_connection %}selected{% endif %}>{{ mins }} min</option>
        {% endfor %}
      </select>
    </div>
  </div>
  {% if journey_type == 'return' %}
    {% for section in sections %}
    <div class="filter-row" style="margin-top:0.5rem">
      <span class="filter-label" style="min-width:5.5rem">{{ 'Outbound' if section.direction == 'outbound' else 'Return' }}:</span>
      {% if section.direction == 'inbound' %}
      <div>
        <label for="min_conn_in_select" class="filter-label">Min connection:</label>
        <select id="min_conn_in_select" onchange="applyConnectionFilter()" class="select-inline">
          {% for mins in valid_inbound_return_min_connections %}
            <option value="{{ mins }}" {% if mins == inbound_min_connection %}selected{% endif %}>{{ mins }} min</option>
          {% endfor %}
        </select>
      </div>
      {% endif %}
      <div>
        <span class="filter-label">NR:</span>
        <div class="btn-group">
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'walkon' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="walkon" onclick="setNrClass('walkon', '{{ section.id }}')">Walk-on Std</button>
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'advance_std' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="advance_std" onclick="setNrClass('advance_std', '{{ section.id }}')">Advance Std</button>
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'advance_1st' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="advance_1st" onclick="setNrClass('advance_1st', '{{ section.id }}')">Advance 1st</button>
        </div>
      </div>
      <div>
        <span class="filter-label">Eurostar:</span>
        <div class="btn-group">
          <button type="button" class="btn-group-option {% if es_classes[section.id] == 'standard' %}active{% endif %}" data-section="{{ section.id }}" data-es-class="standard" onclick="setEsClass('standard', '{{ section.id }}')">Standard</button>
          <button type="button" class="btn-group-option {% if es_classes[section.id] == 'plus' %}active{% endif %}" data-section="{{ section.id }}" data-es-class="plus" onclick="setEsClass('plus', '{{ section.id }}')">Standard Premier</button>
        </div>
      </div>
    </div>
    {% endfor %}
    <div style="font-size:0.82rem;color:#718096;margin-top:0.4rem">
      <span id="walkon-loading"><span class="spinner spinner-inline" aria-hidden="true"></span>Loading fares</span>
      <span id="advance-loading" style="display:none"><span class="spinner spinner-inline" aria-hidden="true"></span>Loading advance fares</span>
    </div>
  {% else %}
    {% set section = sections[0] %}
    <div class="filter-row" style="margin-top:0.5rem">
      <div>
        <span class="filter-label">NR ticket:</span>
        <span id="nr-type-select" style="display:none"></span>
        <span style="display:none">Load advance prices</span>
        <div class="btn-group">
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'walkon' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="walkon" onclick="setNrClass('walkon', '{{ section.id }}')">Walk-on Std</button>
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'advance_std' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="advance_std" onclick="setNrClass('advance_std', '{{ section.id }}')">Advance Std</button>
          <button type="button" class="btn-group-option {% if nr_classes[section.id] == 'advance_1st' %}active{% endif %}" data-section="{{ section.id }}" data-nr-class="advance_1st" onclick="setNrClass('advance_1st', '{{ section.id }}')">Advance 1st</button>
        </div>
        <span id="walkon-loading"><span class="spinner spinner-inline" aria-hidden="true"></span>Loading fares</span>
        <span id="advance-loading" style="display:none"><span class="spinner spinner-inline" aria-hidden="true"></span>Loading advance fares</span>
      </div>
      <div>
        <span class="filter-label">Eurostar:</span>
        <span id="es-type-select" style="display:none"></span>
        <div class="btn-group">
          <button type="button" class="btn-group-option {% if es_classes[section.id] == 'standard' %}active{% endif %}" data-section="{{ section.id }}" data-es-class="standard" onclick="setEsClass('standard', '{{ section.id }}')">Standard</button>
          <button type="button" class="btn-group-option {% if es_classes[section.id] == 'plus' %}active{% endif %}" data-section="{{ section.id }}" data-es-class="plus" onclick="setEsClass('plus', '{{ section.id }}')">Standard Premier</button>
        </div>
      </div>
    </div>
  {% endif %}
  <script>
    const RESULTS_BASE = '{{ results_base_url }}';
    const DEFAULT_MIN_CONN = {{ default_min_connection }};
    const DEFAULT_MAX_CONN = {{ default_max_connection }};
    const DEFAULT_MIN_CONN_IN = {{ default_inbound_min_connection }};
    let TRIP_FARES = {};
    let ADVANCE_FARES = null;
    let WALKON_CACHED_FARES = {};
    let WALKON_API_URLS = {};
    let ADVANCE_API_URLS = {};
    let ADVANCE_STREAM_URLS = {};
    let TIMETABLE_REFRESH_URL = null;
    let HAS_PROVISIONAL_TIMETABLE = false;
    let eurostarRefreshPending = false;
    let cachedAdvanceFares = null;
    let currentNrClasses = {{ nr_classes_json | safe }};
    let currentEsClasses = {{ es_classes_json | safe }};
    const SECTION_DIRECTIONS = {{ section_directions_json | safe }};
    let advanceLoadingSections = {};
    let walkonLoadingSections = {};
    let selectedRowKeys = {};

    function updateAdvanceLoadingStatus() {
      var loading = Object.keys(advanceLoadingSections).some(function(sectionId) {
        return advanceLoadingSections[sectionId];
      });
      var el = document.getElementById('advance-loading');
      if (el) el.style.display = loading ? 'inline-flex' : 'none';
    }

    function buildUrl() {
      var min = parseInt(document.getElementById('min_conn_select').value);
      var max = parseInt(document.getElementById('max_conn_select').value);
      var params = [];
      if (min !== DEFAULT_MIN_CONN) params.push('min_connection=' + min);
      if (max !== DEFAULT_MAX_CONN) params.push('max_connection=' + max);
      var minInEl = document.getElementById('min_conn_in_select');
      if (minInEl) {
        var minIn = parseInt(minInEl.value);
        if (minIn !== DEFAULT_MIN_CONN_IN) params.push('min_connection_in=' + minIn);
      }
      var sectionIds = Object.keys(currentNrClasses);
      if (sectionIds.length === 1) {
        var nrCls = currentNrClasses[sectionIds[0]];
        var esCls = currentEsClasses[sectionIds[0]];
        if (nrCls !== 'walkon') params.push('nr_class=' + nrCls);
        if (esCls !== 'standard') params.push('es_class=' + esCls);
      } else {
        sectionIds.forEach(function(sid) {
          var dir = SECTION_DIRECTIONS[sid];
          var suffix = dir === 'outbound' ? '_out' : '_in';
          var nrC = currentNrClasses[sid];
          var esC = currentEsClasses[sid];
          if (nrC !== 'walkon') params.push('nr_class' + suffix + '=' + nrC);
          if (esC !== 'standard') params.push('es_class' + suffix + '=' + esC);
        });
      }
      for (var _sid in selectedRowKeys) {
        var _sel = selectedRowKeys[_sid];
        if (!_sel || !SECTION_DIRECTIONS[_sid]) continue;
        var _pname = SECTION_DIRECTIONS[_sid] === 'outbound' ? 'out' : 'ret';
        params.push(_pname + '=' + encodeURIComponent(_sel.slice(_sid.length + 1)));
      }
      return params.length ? RESULTS_BASE + '?' + params.join('&') : RESULTS_BASE;
    }

    function applyConnectionFilter() {
      window.location = buildUrl();
    }

    function setNrClass(cls, sectionId) {
      currentNrClasses[sectionId] = cls;
      document.querySelectorAll('.btn-group-option[data-section="' + sectionId + '"][data-nr-class]').forEach(function(btn) {
        btn.classList.toggle('active', btn.getAttribute('data-nr-class') === cls);
      });
      history.replaceState(null, '', buildUrl());
      if (cls === 'advance_std' || cls === 'advance_1st') loadAdvanceFaresForSectionStreaming(sectionId);
      updateDisplay();
    }

    function setEsClass(cls, sectionId) {
      currentEsClasses[sectionId] = cls;
      document.querySelectorAll('.btn-group-option[data-section="' + sectionId + '"][data-es-class]').forEach(function(btn) {
        btn.classList.toggle('active', btn.getAttribute('data-es-class') === cls);
      });
      history.replaceState(null, '', buildUrl());
      updateDisplay();
    }

    function fmtPrice(p) {
      return '£' + p.toFixed(2);
    }

    function fareHtml(fare) {
      return '<span class="text-sm font-bold">' + fmtPrice(fare.price) + '</span>'
           + (fare.ticket ? ' <span class="text-xs text-muted">' + fare.ticket + '</span>' : '')
           + (fare.seats != null ? ' <span class="text-xs text-muted fare-seats">' + fare.seats + ' at this price</span>' : '');
    }

    function mergeAdvanceFares(sectionId, fares) {
      if (!ADVANCE_FARES) ADVANCE_FARES = {};
      if (!ADVANCE_FARES[sectionId]) ADVANCE_FARES[sectionId] = {};
      for (var time in fares) {
        if (!ADVANCE_FARES[sectionId][time]) {
          ADVANCE_FARES[sectionId][time] = {advance_std: null, advance_1st: null};
        }
        if (fares[time].advance_std) ADVANCE_FARES[sectionId][time].advance_std = fares[time].advance_std;
        if (fares[time].advance_1st) ADVANCE_FARES[sectionId][time].advance_1st = fares[time].advance_1st;
      }
    }

    function mergeWalkonFares(sectionId, fares) {
      for (var key in TRIP_FARES) {
        var row = TRIP_FARES[key];
        if (row.section !== sectionId || !row.advance_key || !fares[row.advance_key]) continue;
        var fare = fares[row.advance_key];
        row.walkon = {price: fare.price, ticket: fare.ticket || ''};
      }
    }

    function mergeEurostarPrices(prices) {
      for (var key in prices) {
        for (var rowKey in TRIP_FARES) {
          var row = TRIP_FARES[rowKey];
          if (rowKey !== key && row.eurostar_key !== key) continue;
          if (prices[key].es_standard) row.es_standard = prices[key].es_standard;
          if (prices[key].es_standard_status !== undefined) row.es_standard_status = prices[key].es_standard_status;
          if (prices[key].es_plus) row.es_plus = prices[key].es_plus;
          if (prices[key].es_plus_status !== undefined) row.es_plus_status = prices[key].es_plus_status;
        }
      }
    }

    function eurostarMissingText(row, esClass) {
      var status = esClass === 'standard' ? row.es_standard_status : row.es_plus_status;
      if (status === 'sold_out') return 'Eurostar sold out';
      if (status === 'price_not_returned') return 'No Eurostar price returned';
      return 'No Eurostar price returned';
    }

    function eurostarMissingTitle(row, esClass) {
      var status = esClass === 'standard' ? row.es_standard_status : row.es_plus_status;
      if (status === 'sold_out') return 'Eurostar returned 0 seats at this price for the selected class.';
      if (status === 'price_not_returned') return 'Eurostar returned this service without a price for the selected class.';
      return 'Eurostar did not return a price for the selected class. Check eurostar.com.';
    }

    function eurostarMissingFareHtml(row, esClass) {
      var status = esClass === 'standard' ? row.es_standard_status : row.es_plus_status;
      if (eurostarRefreshPending && !status) return '<span class="text-sm text-muted">checking</span>';
      if (status === 'sold_out') return '<span class="text-sm text-muted">sold out</span>';
      return '<span class="text-sm text-muted">–</span>';
    }

    function sectionNeedsAdvance(sectionId) {
      var nrClass = currentNrClasses[sectionId] || 'walkon';
      for (var key in TRIP_FARES) {
        var row = TRIP_FARES[key];
        if (row.section !== sectionId || !row.advance_key) continue;
        var sectionFares = ADVANCE_FARES && ADVANCE_FARES[sectionId];
        var advanceFares = sectionFares && sectionFares[row.advance_key];
        if (!advanceFares) return true;
        if (nrClass === 'advance_std' && !advanceFares.advance_std) return true;
        if (nrClass === 'advance_1st' && !advanceFares.advance_1st) return true;
      }
      return false;
    }

    function loadAdvanceFaresForSection(sectionId) {
      if (advanceLoadingSections[sectionId] || !ADVANCE_API_URLS[sectionId]) return;
      advanceLoadingSections[sectionId] = true;
      updateAdvanceLoadingStatus();
      if (!ADVANCE_FARES) ADVANCE_FARES = {};
      if (!ADVANCE_FARES[sectionId]) ADVANCE_FARES[sectionId] = {};

      fetch(ADVANCE_API_URLS[sectionId])
        .then(function(response) {
          if (!response.ok) throw new Error('advance fare request failed');
          return response.json();
        })
        .then(function(fares) {
          mergeAdvanceFares(sectionId, fares);
        })
        .catch(function() {})
        .finally(function() {
          advanceLoadingSections[sectionId] = false;
          updateAdvanceLoadingStatus();
          updateDisplay();
        });
    }

    function loadAdvanceFaresForSectionStreaming(sectionId) {
      if (advanceLoadingSections[sectionId] || !ADVANCE_STREAM_URLS[sectionId]) return;
      advanceLoadingSections[sectionId] = true;
      updateAdvanceLoadingStatus();
      if (!ADVANCE_FARES) ADVANCE_FARES = {};
      if (!ADVANCE_FARES[sectionId]) ADVANCE_FARES[sectionId] = {};

      var hadMessage = false;
      var source = new EventSource(ADVANCE_STREAM_URLS[sectionId]);
      source.onmessage = function(event) {
        hadMessage = true;
        var msg = JSON.parse(event.data);
        if (msg.type === 'fares') {
          mergeAdvanceFares(sectionId, msg.fares);
          updateDisplay();
        }
        if (msg.type === 'done' || msg.type === 'error') {
          advanceLoadingSections[sectionId] = false;
          source.close();
          updateAdvanceLoadingStatus();
          updateDisplay();
        }
      };
      source.onerror = function() {
        advanceLoadingSections[sectionId] = false;
        source.close();
        updateAdvanceLoadingStatus();
        if (!hadMessage && ADVANCE_API_URLS[sectionId]) {
          loadAdvanceFaresForSection(sectionId);
        } else {
          updateDisplay();
        }
      };
    }

    function loadMissingAdvanceFares() {
      for (var sectionId in ADVANCE_STREAM_URLS) {
        var nrClass = currentNrClasses[sectionId] || 'walkon';
        if ((nrClass === 'advance_std' || nrClass === 'advance_1st') && sectionNeedsAdvance(sectionId)) {
          loadAdvanceFaresForSectionStreaming(sectionId);
        }
      }
    }

    function currentNrFare(row) {
      var nrClass = currentNrClasses[row.section] || 'walkon';
      if (nrClass === 'walkon') return row.walkon;
      var sectionFares = ADVANCE_FARES && ADVANCE_FARES[row.section];
      var advFares = sectionFares && row.advance_key ? sectionFares[row.advance_key] : null;
      if (!advFares) return row.walkon;
      return (nrClass === 'advance_std' ? advFares.advance_std : advFares.advance_1st) || row.walkon;
    }

    function updateDisplay() {
      var totals = {};
      document.querySelectorAll('tr[data-row-key]').forEach(function(tr) {
        var key = tr.getAttribute('data-row-key');
        var row = TRIP_FARES[key];
        if (!row) return;
        var nrFare = currentNrFare(row);
        var esClass = currentEsClasses[row.section] || 'standard';
        var esFare = esClass === 'standard' ? row.es_standard : row.es_plus;
        if (nrFare && esFare) totals[key] = nrFare.price + esFare.price + (row.circle_fare || 0);
      });
      var totalValues = Object.values(totals);
      var minTotal = totalValues.length > 1 ? Math.min.apply(null, totalValues) : null;
      var maxTotal = totalValues.length > 1 ? Math.max.apply(null, totalValues) : null;

      document.querySelectorAll('tr[data-row-key]').forEach(function(tr) {
        var key = tr.getAttribute('data-row-key');
        var row = TRIP_FARES[key];
        if (!row) return;

        var nrClass = currentNrClasses[row.section] || 'walkon';
        var esClass = currentEsClasses[row.section] || 'standard';
        var nrFare = currentNrFare(row);
        var walkonEl = tr.querySelector('.nr-walkon');
        var advStdEl = tr.querySelector('.nr-advance-std');
        var adv1stEl = tr.querySelector('.nr-advance-1st');
        if (walkonEl) {
          walkonEl.innerHTML = row.walkon ? fareHtml(row.walkon) : '<span class="text-sm text-muted">–</span>';
          walkonEl.classList.toggle('fare-inactive', nrClass !== 'walkon');
        }
        if (advStdEl || adv1stEl) {
          var sectionFares = ADVANCE_FARES && ADVANCE_FARES[row.section];
          var advFares = sectionFares && row.advance_key ? sectionFares[row.advance_key] : null;
          if (advStdEl) {
            advStdEl.innerHTML = advFares && advFares.advance_std ? fareHtml(advFares.advance_std) : '';
            advStdEl.classList.toggle('fare-inactive', nrClass !== 'advance_std');
          }
          if (adv1stEl) {
            adv1stEl.innerHTML = advFares && advFares.advance_1st ? fareHtml(advFares.advance_1st) : '';
            adv1stEl.classList.toggle('fare-inactive', nrClass !== 'advance_1st');
          }
        }

        var esStdEl = tr.querySelector('.es-standard');
        var esPlusEl = tr.querySelector('.es-plus');
        if (esStdEl) {
          esStdEl.innerHTML = '<span class="text-xs text-muted">Std</span> ' + (row.es_standard ? fareHtml(row.es_standard) : eurostarMissingFareHtml(row, 'standard'));
          esStdEl.classList.toggle('fare-inactive', esClass !== 'standard');
        }
        if (esPlusEl) {
          esPlusEl.innerHTML = '<span class="text-xs text-muted">SP</span> ' + (row.es_plus ? fareHtml(row.es_plus) : eurostarMissingFareHtml(row, 'plus'));
          esPlusEl.classList.toggle('fare-inactive', esClass !== 'plus');
        }

        var totalSpan = tr.querySelector('.total-price');
        if (totalSpan) {
          if (key.indexOf(':unreachable:') !== -1) {
            totalSpan.innerHTML = '<span class="text-xs text-muted" title="No National Rail service from {{ departure_station_name }} arrives at Paddington in time for this Eurostar">No rail connection</span>';
          } else if (key in totals) {
            var total = totals[key];
            var html = '<span class="text-sm text-green" style="font-weight:700">' + fmtPrice(total);
            if (minTotal !== null && maxTotal !== null) {
              if (total <= minTotal + 10) html += ' <span title="Cheapest journey">🪙</span>';
              else if (total >= maxTotal - 10) html += ' <span title="Most expensive journey">💸</span>';
            }
            html += '</span>';
            totalSpan.innerHTML = html;
          } else if (!nrFare && walkonLoadingSections[row.section]) {
            totalSpan.innerHTML = '';
          } else if (!nrFare) {
            totalSpan.innerHTML = '<span class="text-xs text-muted" title="National Rail fare data is not available for this service">NR fare not available</span>';
          } else if (eurostarRefreshPending) {
            totalSpan.innerHTML = '<span class="text-xs text-muted" title="Checking exact Eurostar data for this service">Checking Eurostar price</span>';
          } else {
            totalSpan.innerHTML = '<span class="text-xs text-muted" title="' + eurostarMissingTitle(row, esClass) + ' Check eurostar.com.">' + eurostarMissingText(row, esClass) + '</span>';
          }
        }
      });
      updateSelectionBar();
    }

    function loadWalkonFares() {
      var urls = WALKON_API_URLS;
      var ids = Object.keys(urls);
      if (!ids.length) return;
      /* outbound first, then inbound */
      ids.sort(function(a, b) {
        return (SECTION_DIRECTIONS[a] === 'outbound' ? 0 : 1) -
               (SECTION_DIRECTIONS[b] === 'outbound' ? 0 : 1);
      });
      ids.forEach(function(sid) { walkonLoadingSections[sid] = true; });
      var pending = ids.length;
      function done(id) {
        walkonLoadingSections[id] = false;
        if (--pending === 0) {
          var el = document.getElementById('walkon-loading');
          if (el) el.style.display = 'none';
        }
      }
      /* sequential: each fetch starts only after the previous one finishes */
      ids.reduce(function(chain, id) {
        return chain.then(function() {
          return fetch(urls[id])
            .then(function(r) { return r.json(); })
            .then(function(fares) { mergeWalkonFares(id, fares); done(id); updateDisplay(); })
            .catch(function() { done(id); updateDisplay(); });
        });
      }, Promise.resolve());
    }

    function initSelectionFromUrl() {
      var params = new URLSearchParams(window.location.search);
      for (var sid in SECTION_DIRECTIONS) {
        var dir = SECTION_DIRECTIONS[sid];
        var val = params.get(dir === 'outbound' ? 'out' : 'ret');
        if (val) {
          var rowKey = sid + ':' + val;
          if (TRIP_FARES[rowKey]) selectedRowKeys[sid] = rowKey;
        }
      }
    }

    function selectRow(tr) {
      var key = tr.getAttribute('data-row-key');
      if (!key || key.indexOf(':unreachable:') !== -1) return;
      var row = TRIP_FARES[key];
      if (!row) return;
      selectedRowKeys[row.section] = (selectedRowKeys[row.section] === key) ? null : key;
      updateRowHighlights();
      updateSelectionBar();
      history.replaceState(null, '', buildUrl());
    }

    function clearSelection() {
      selectedRowKeys = {};
      updateRowHighlights();
      updateSelectionBar();
      history.replaceState(null, '', buildUrl());
    }

    function updateRowHighlights() {
      document.querySelectorAll('tr[data-row-key]').forEach(function(tr) {
        var key = tr.getAttribute('data-row-key');
        var row = TRIP_FARES[key];
        if (!row) return;
        tr.classList.toggle('row-selected', selectedRowKeys[row.section] === key);
      });
    }

    function updateSelectionBar() {
      var bar = document.getElementById('selection-bar');
      if (!bar) return;
      var allSids = Object.keys(SECTION_DIRECTIONS);
      var activeSids = allSids.filter(function(sid) { return selectedRowKeys[sid]; });
      if (activeSids.length === 0) { bar.style.display = 'none'; return; }
      bar.style.display = 'block';

      var totalNr = 0, totalEs = 0, totalCircle = 0, allPrices = true;
      var parts = [];
      activeSids.forEach(function(sid) {
        var rowKey = selectedRowKeys[sid];
        var row = TRIP_FARES[rowKey];
        if (!row) return;
        var nrFare = currentNrFare(row);
        var esClass = currentEsClasses[sid] || 'standard';
        var esFare = esClass === 'standard' ? row.es_standard : row.es_plus;
        if (nrFare) totalNr += nrFare.price; else allPrices = false;
        if (esFare) totalEs += esFare.price; else allPrices = false;
        totalCircle += row.circle_fare || 0;
        var kp = rowKey.split(':');
        var depTime = SECTION_DIRECTIONS[sid] === 'outbound'
          ? kp[1] + ':' + kp[2]
          : kp[3] + ':' + kp[4];
        parts.push((SECTION_DIRECTIONS[sid] === 'outbound' ? 'Out ' : 'Ret ') + depTime);
      });

      var descEl = document.getElementById('sel-desc');
      if (descEl) descEl.textContent = parts.join('  ·  ');

      var hintEl = document.getElementById('sel-hint');
      if (hintEl) {
        if (allSids.length > 1 && activeSids.length < allSids.length) {
          var missingDir = SECTION_DIRECTIONS[allSids.filter(function(s) { return !selectedRowKeys[s]; })[0]];
          hintEl.textContent = 'Select a ' + (missingDir === 'outbound' ? 'outbound' : 'return') + ' journey to see combined total';
          hintEl.style.display = '';
        } else {
          hintEl.style.display = 'none';
        }
      }

      var grandTotal = totalNr + totalEs + totalCircle;
      var nrEl = document.getElementById('sel-nr');
      var esEl = document.getElementById('sel-es');
      var grandEl = document.getElementById('sel-grand');
      if (nrEl) nrEl.innerHTML = 'NR&nbsp;<strong>' + (allPrices ? fmtPrice(totalNr) : '–') + '</strong>';
      if (esEl) esEl.innerHTML = 'Eurostar&nbsp;<strong>' + (allPrices ? fmtPrice(totalEs) : '–') + '</strong>';
      if (grandEl) {
        var label = (activeSids.length === allSids.length && allSids.length > 1) ? 'Grand total' : 'Total';
        var priceHtml = allPrices
          ? '<strong style="font-size:1.05rem;color:#276749">' + fmtPrice(grandTotal) + '</strong>'
          : '<strong>–</strong>';
        grandEl.innerHTML = label + '&nbsp;' + priceHtml;
      }
    }

    function initialiseResultsPage() {
      initSelectionFromUrl();
      var needsAdvance = Object.keys(currentNrClasses).some(function(sid) {
        var c = currentNrClasses[sid];
        return c === 'advance_std' || c === 'advance_1st';
      });
      if (needsAdvance) loadMissingAdvanceFares();
      /* Pre-populate walk-on fares from weekday cache so prices show immediately */
      var hasPreloaded = false;
      for (var sid in WALKON_CACHED_FARES) {
        if (WALKON_CACHED_FARES[sid]) { mergeWalkonFares(sid, WALKON_CACHED_FARES[sid]); hasPreloaded = true; }
      }
      updateDisplay();
      updateRowHighlights();
      if (hasPreloaded) {
        var loadingEl = document.getElementById('walkon-loading');
        if (loadingEl) loadingEl.innerHTML = '<span class="spinner spinner-inline" aria-hidden="true"></span>Verifying fares';
      }
      loadWalkonFares();
      startTimetableRefresh();
    }

    function runInsertedScripts(root) {
      root.querySelectorAll('script').forEach(function(oldScript) {
        var script = document.createElement('script');
        for (var i = 0; i < oldScript.attributes.length; i++) {
          var attr = oldScript.attributes[i];
          script.setAttribute(attr.name, attr.value);
        }
        script.text = oldScript.text;
        oldScript.parentNode.replaceChild(script, oldScript);
      });
    }

    function fullResultsUrl() {
      var url = new URL(window.location.href);
      url.searchParams.set('render', 'full');
      return url.toString();
    }

    function refreshFullResults() {
      fetch(fullResultsUrl(), {headers: {'X-Requested-With': 'fetch'}})
        .then(function(response) {
          if (!response.ok) throw new Error('Could not refresh results');
          return response.text();
        })
        .then(function(html) {
          var doc = new DOMParser().parseFromString(html, 'text/html');
          var nextMain = doc.querySelector('main');
          var currentMain = document.querySelector('main');
          if (!nextMain || !currentMain) throw new Error('Results page was incomplete');
          document.title = doc.title;
          currentMain.innerHTML = nextMain.innerHTML;
          runInsertedScripts(currentMain);
        })
        .catch(function() {});
    }

    function startTimetableRefresh() {
      if (!HAS_PROVISIONAL_TIMETABLE || !TIMETABLE_REFRESH_URL || !window.EventSource) return;
      eurostarRefreshPending = true;
      updateDisplay();
      var source = new EventSource(TIMETABLE_REFRESH_URL);
      source.onmessage = function(event) {
        var msg = JSON.parse(event.data);
        if (msg.type === 'reload') {
          source.close();
          refreshFullResults();
        } else if (msg.type === 'eurostar_prices') {
          mergeEurostarPrices(msg.prices);
          updateDisplay();
        } else if (msg.type === 'walkon_fares') {
          mergeWalkonFares(msg.section, msg.fares);
          updateDisplay();
        } else if (msg.type === 'done' || msg.type === 'error') {
          eurostarRefreshPending = false;
          source.close();
          updateDisplay();
        }
      };
      source.onerror = function() {
        eurostarRefreshPending = false;
        source.close();
        updateDisplay();
      };
    }

    function mergeSectionData(msg) {
      if (msg.trip_fares) Object.assign(TRIP_FARES, msg.trip_fares);
      var sid = msg.id;
      if (msg.advance_fares !== undefined) {
        if (!ADVANCE_FARES) ADVANCE_FARES = {};
        ADVANCE_FARES[sid] = msg.advance_fares;
      }
      if (msg.walkon_cached_fares !== undefined) WALKON_CACHED_FARES[sid] = msg.walkon_cached_fares;
      if (msg.walkon_api_url) WALKON_API_URLS[sid] = msg.walkon_api_url;
      if (msg.advance_api_url) ADVANCE_API_URLS[sid] = msg.advance_api_url;
      if (msg.advance_stream_url) ADVANCE_STREAM_URLS[sid] = msg.advance_stream_url;
    }

    function finaliseResults(msg) {
      TIMETABLE_REFRESH_URL = msg.timetable_refresh_url || null;
      HAS_PROVISIONAL_TIMETABLE = msg.provisional_timetable || false;
      eurostarRefreshPending = HAS_PROVISIONAL_TIMETABLE && !!TIMETABLE_REFRESH_URL && !!window.EventSource;
      var summaryEl = document.getElementById('results-summary');
      if (summaryEl && msg.summary_html) summaryEl.innerHTML = msg.summary_html;
      initialiseResultsPage();
    }
  </script>
  <p id="results-summary" class="card-meta">
    <span class="spinner spinner-inline" aria-hidden="true"></span>
  </p>
  <div id="results-alerts"></div>
</div>

{% for section in sections %}
<div id="section-placeholder-{{ section.id }}" class="card" style="margin-bottom:1.5rem">
  <div class="loading-panel" role="status">
    <span class="spinner" aria-hidden="true"></span>
    <div><strong>Loading {{ 'return' if section.direction == 'inbound' else 'outbound' }} results&hellip;</strong></div>
  </div>
</div>
{% endfor %}

<p class="footnote">
  Connection windows:
  {% for section in sections %}
    {% if section.direction == 'inbound' %}return{% else %}outbound{% endif %}
    {{ section.min_connection }}&ndash;{{ section.max_connection }}&nbsp;min{% if not loop.last %}; {% endif %}
  {% endfor %}.
  National Rail prices from <a href="https://www.gwr.com/" target="_blank" rel="noopener">gwr.com</a>.
  Eurostar prices are for 1 adult in GBP; return searches use Eurostar return-search prices.
  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 }} on RTT</a>
  &nbsp;&middot;&nbsp;
  <a href="{{ rtt_url }}" target="_blank" rel="noopener">Paddington on RTT</a>
</p>

<div id="selection-bar">
  <div class="sel-bar-inner">
    <div>
      <span id="sel-desc" style="color:#2d3748"></span>
      <span id="sel-hint" style="display:none; margin-left:1rem; color:#a0aec0; font-size:0.8rem"></span>
    </div>
    <div class="sel-totals">
      <span id="sel-nr" class="text-muted"></span>
      <span id="sel-es" class="text-muted"></span>
      <span id="sel-grand"></span>
      <button class="sel-clear" onclick="clearSelection()">Clear</button>
    </div>
  </div>
</div>

{% endblock %}