(function () {
  var cfg = window.EB_CONCIERGE || {};
  var botId = cfg.botId;
  var apiBase = (cfg.apiBase || '').replace(/\/$/, '');
  if (!botId || !apiBase) {
    // eslint-disable-next-line no-console
    console.error('[EventBuzz Concierge] Missing window.EB_CONCIERGE.botId or apiBase');
    return;
  }

  var storageKey = 'ebc_session_' + botId;
  var sessionId = null;
  // A page refresh starts a new chat. Remove IDs saved by older widget builds so
  // participant identity is never silently restored from localStorage.
  try { localStorage.removeItem(storageKey); } catch {}

  function el(tag, attrs, children) {
    var n = document.createElement(tag);
    if (attrs) for (var k in attrs) n.setAttribute(k, attrs[k]);
    if (children) children.forEach(function (c) { n.appendChild(typeof c === 'string' ? document.createTextNode(c) : c); });
    return n;
  }

  function addCssOnce() {
    if (document.getElementById('ebc-css')) return;
    var link = el('link', { id: 'ebc-css', rel: 'stylesheet', href: apiBase.replace(/\/api$/, '') + '/embed/concierge-widget.css' });
    document.head.appendChild(link);
  }

  addCssOnce();

  var launcher = el('button', { class: 'ebc-launcher', type: 'button', 'aria-label': 'Chat with event concierge' }, ['Chat']);
  var panel = el('div', { class: 'ebc-panel', role: 'dialog', 'aria-label': 'Event concierge chat' });
  var header = el('div', { class: 'ebc-header' });
  var title = el('div', { class: 'ebc-title' }, ['Event Concierge']);
  var headerActions = el('div', { class: 'ebc-header-actions' });
  var endBtn = el('button', { class: 'ebc-end', type: 'button', 'aria-label': 'End chat' }, ['End chat']);
  var closeBtn = el('button', { class: 'ebc-close', type: 'button', 'aria-label': 'Close' }, ['×']);
  header.appendChild(title);
  headerActions.appendChild(endBtn);
  headerActions.appendChild(closeBtn);
  header.appendChild(headerActions);

  var messages = el('div', { class: 'ebc-messages' });
  var error = el('div', { class: 'ebc-error' }, ['']);
  var inputBar = el('div', { class: 'ebc-inputbar' });
  var input = el('input', { class: 'ebc-input', placeholder: 'Ask a question…', maxlength: '800' });
  var sendBtn = el('button', { class: 'ebc-send', type: 'button' }, ['Send']);
  inputBar.appendChild(input);
  inputBar.appendChild(sendBtn);

  panel.appendChild(header);
  panel.appendChild(messages);
  panel.appendChild(error);
  panel.appendChild(inputBar);
  document.body.appendChild(launcher);
  document.body.appendChild(panel);

  function setError(msg) {
    if (!msg) {
      error.style.display = 'none';
      error.textContent = '';
      return;
    }
    error.style.display = 'block';
    error.textContent = msg;
  }

  function parseNumberedRecommendations(text) {
    var source = String(text || '').trim();
    var markerPattern = /(?:^|\s)(\d{1,2})[.)]\s+/g;
    var markers = [];
    var match;

    while ((match = markerPattern.exec(source)) !== null) {
      markers.push({
        number: match[1],
        markerStart: match.index,
        contentStart: markerPattern.lastIndex
      });
    }

    if (markers.length < 2) return null;

    var intro = source.slice(0, markers[0].markerStart).trim();
    var items = markers.map(function (marker, index) {
      var nextMarker = markers[index + 1];
      return {
        number: marker.number,
        text: source.slice(marker.contentStart, nextMarker ? nextMarker.markerStart : source.length).trim()
      };
    }).filter(function (item) { return item.text; });

    return items.length >= 2 ? { intro: intro, items: items } : null;
  }

  function appendAssistantContent(bubble, text) {
    var parsed = parseNumberedRecommendations(text);
    if (!parsed) {
      bubble.textContent = text;
      return;
    }

    bubble.classList.add('ebc-rich');
    if (parsed.intro) {
      bubble.appendChild(el('p', { class: 'ebc-intro' }, [parsed.intro]));
    }

    var list = el('div', { class: 'ebc-card-list' });
    parsed.items.forEach(function (item) {
      var card = el('div', { class: 'ebc-card' });
      card.appendChild(el('div', { class: 'ebc-card-number' }, [item.number]));
      card.appendChild(el('div', { class: 'ebc-card-text' }, [item.text]));
      list.appendChild(card);
    });
    bubble.appendChild(list);
  }

  function formatRating(place) {
    if (place.rating === null || place.rating === undefined || place.rating === '') return 'Rating not available';
    var label = String(place.rating);
    if (place.userRatingsTotal !== null && place.userRatingsTotal !== undefined) {
      label += ' (' + String(place.userRatingsTotal) + ' reviews)';
    }
    return label;
  }

  function mapsUrl(place) {
    if (place.location && isFinite(Number(place.location.lat)) && isFinite(Number(place.location.lng))) {
      return 'https://www.google.com/maps/search/?api=1&query=' +
        encodeURIComponent(String(place.location.lat) + ',' + String(place.location.lng)) +
        '&query_place_id=' + encodeURIComponent(place.placeId || place.foodId || '');
    }
    return 'https://www.google.com/maps/search/?api=1&query=' + encodeURIComponent((place.name || '') + ' ' + (place.address || ''));
  }

  function appendPlaceCards(bubble, text, places) {
    bubble.classList.add('ebc-rich', 'ebc-places');
    if (text) bubble.appendChild(el('p', { class: 'ebc-intro' }, [text]));

    var list = el('div', { class: 'ebc-place-list' });
    places.forEach(function (place) {
      var card = el('article', { class: 'ebc-place-card' });
      var head = el('div', { class: 'ebc-place-head' });
      head.appendChild(el('div', { class: 'ebc-place-pin', 'aria-hidden': 'true' }, ['⌖']));
      var titleWrap = el('div', { class: 'ebc-place-title-wrap' });
      titleWrap.appendChild(el('h3', { class: 'ebc-place-name' }, [place.name || 'Unnamed place']));
      titleWrap.appendChild(el('div', { class: 'ebc-place-rating' }, [formatRating(place)]));
      head.appendChild(titleWrap);
      card.appendChild(head);

      if (place.address) card.appendChild(el('p', { class: 'ebc-place-address' }, [place.address]));

      if (Array.isArray(place.tags) && place.tags.length) {
        var tags = el('div', { class: 'ebc-place-tags' });
        place.tags.slice(0, 3).forEach(function (tag) {
          tags.appendChild(el('span', { class: 'ebc-place-tag' }, [String(tag)]));
        });
        card.appendChild(tags);
      }

      card.appendChild(el('a', { class: 'ebc-place-map', href: mapsUrl(place), target: '_blank', rel: 'noopener noreferrer' }, ['Open map']));
      list.appendChild(card);
    });
    bubble.appendChild(list);
  }

  function appendFoodCards(bubble, text, foods) {
    bubble.classList.add('ebc-rich', 'ebc-foods');
    if (text) bubble.appendChild(el('p', { class: 'ebc-intro' }, [text]));

    var list = el('div', { class: 'ebc-food-list' });
    foods.forEach(function (food) {
      var card = el('article', { class: 'ebc-food-card' });
      var head = el('div', { class: 'ebc-place-head' });
      head.appendChild(el('div', { class: 'ebc-food-icon', 'aria-hidden': 'true' }, ['🍽']));
      var titleWrap = el('div', { class: 'ebc-place-title-wrap' });
      titleWrap.appendChild(el('h3', { class: 'ebc-place-name' }, [food.name || 'Unnamed restaurant']));
      titleWrap.appendChild(el('div', { class: 'ebc-place-rating' }, [formatRating(food)]));
      head.appendChild(titleWrap);
      card.appendChild(head);

      if (food.address) card.appendChild(el('p', { class: 'ebc-place-address' }, [food.address]));

      if (Array.isArray(food.cuisines) && food.cuisines.length) {
        var cuisines = el('div', { class: 'ebc-place-tags' });
        food.cuisines.slice(0, 3).forEach(function (cuisine) {
          cuisines.appendChild(el('span', { class: 'ebc-food-tag' }, [String(cuisine).replace(/_/g, ' ')]));
        });
        card.appendChild(cuisines);
      }

      card.appendChild(el('a', { class: 'ebc-place-map', href: mapsUrl(food), target: '_blank', rel: 'noopener noreferrer' }, ['Open map']));
      list.appendChild(card);
    });
    bubble.appendChild(list);
  }

  function addMessage(role, text, places, foods) {
    var bubble = el('div', { class: 'ebc-msg' + (role === 'user' ? ' ebc-user' : '') });
    if (role === 'assistant' && Array.isArray(foods) && foods.length) appendFoodCards(bubble, text, foods);
    else if (role === 'assistant' && Array.isArray(places) && places.length) appendPlaceCards(bubble, text, places);
    else if (role === 'assistant') appendAssistantContent(bubble, text);
    else bubble.textContent = text;
    messages.appendChild(bubble);
    messages.scrollTop = messages.scrollHeight;
  }

  function openPanel() {
    panel.classList.add('ebc-open');
    input.focus();
  }
  function closePanel() {
    panel.classList.remove('ebc-open');
  }

  launcher.addEventListener('click', function () {
    if (panel.classList.contains('ebc-open')) closePanel();
    else openPanel();
  });
  closeBtn.addEventListener('click', closePanel);
  endBtn.addEventListener('click', function () {
    var endingSessionId = sessionId;
    sessionId = null;
    try { localStorage.removeItem(storageKey); } catch {}
    messages.textContent = '';
    addMessage('assistant', 'This chat has ended. Ask a question to start a new session.');
    if (endingSessionId) {
      http('/public/concierge/' + encodeURIComponent(botId) + '/session/end', {
        sessionId: endingSessionId
      }).catch(function () {});
    }
  });

  function http(path, body) {
    return fetch(apiBase + path, {
      method: body ? 'POST' : 'GET',
      headers: { 'Content-Type': 'application/json' },
      body: body ? JSON.stringify(body) : undefined,
      credentials: 'omit'
    }).then(function (r) {
      return r.json().then(function (j) { return { status: r.status, json: j }; });
    });
  }

  // Load config
  http('/public/concierge/' + encodeURIComponent(botId) + '/config').then(function (res) {
    if (res.json && res.json.success && res.json.data) {
      title.textContent = res.json.data.eventName ? ('Concierge · ' + res.json.data.eventName) : 'Event Concierge';
      var greet = res.json.data.greeting;
      if (greet) addMessage('assistant', greet);
      if (res.json.data.maxMessageLength) input.setAttribute('maxlength', String(res.json.data.maxMessageLength));
    }
  });

  function send() {
    var text = String(input.value || '').trim();
    if (!text) return;
    setError(null);
    input.value = '';
    addMessage('user', text);
    sendBtn.disabled = true;

    http('/public/concierge/' + encodeURIComponent(botId) + '/chat', {
      sessionId: sessionId || undefined,
      message: text
    }).then(function (res) {
      sendBtn.disabled = false;
      if (!res.json || !res.json.success) {
        setError((res.json && res.json.error && res.json.error.message) ? res.json.error.message : 'Request failed');
        return;
      }
      if (res.json.data && res.json.data.sessionId) {
        sessionId = res.json.data.sessionId;
      }
      addMessage(
        'assistant',
        (res.json.data && res.json.data.reply) ? res.json.data.reply : '…',
        res.json.data && Array.isArray(res.json.data.places) ? res.json.data.places : [],
        res.json.data && Array.isArray(res.json.data.foods) ? res.json.data.foods : []
      );
      // Log detected intent to browser console when backend returns it
      if (res.json.data && res.json.data.intent) {
        // eslint-disable-next-line no-console
        console.info('[EventBuzz Concierge] detected intent:', res.json.data.intent);
      }
    }).catch(function (e) {
      sendBtn.disabled = false;
      setError(e && e.message ? e.message : 'Network error');
    });
  }

  sendBtn.addEventListener('click', send);
  input.addEventListener('keydown', function (e) {
    if (e.key === 'Enter') send();
  });
})();