const statusEl = document.querySelector('#status');
const connectButton = document.querySelector('#connectButton');
const disconnectButton = document.querySelector('#disconnectButton');
const refreshAccountsButton = document.querySelector('#refreshAccounts');
const accountsEl = document.querySelector('#accounts');
const locationsEl = document.querySelector('#locations');
const businessCountEl = document.querySelector('#businessCount');
const auditEl = document.querySelector('#audit');
const auditScoreEl = document.querySelector('#auditScore');
const competitorForm = document.querySelector('#competitorForm');
const competitorQueryInput = document.querySelector('#competitorQuery');
const competitorsEl = document.querySelector('#competitors');

let selectedAccount = null;
let selectedLocation = null;
let currentAuditLocation = null;

async function api(path, options) {
  const response = await fetch(path, options);
  const data = await response.json().catch(() => ({}));

  if (!response.ok) {
    throw new Error(data.error || `Request failed with ${response.status}`);
  }

  return data;
}

async function jsonApi(path, method, body) {
  return api(path, {
    method,
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify(body)
  });
}

function setConnectionState(connected) {
  connectButton.hidden = connected;
  disconnectButton.hidden = !connected;
  statusEl.textContent = connected ? 'Google account connected.' : 'No Google account connected.';
}

function showError(element, error) {
  if (element === locationsEl) {
    element.className = 'businessGrid error';
  } else if (element === auditEl) {
    element.className = 'audit error';
  } else if (element === competitorsEl) {
    element.className = 'competitorGrid error';
  } else {
    element.className = 'list error';
  }

  element.textContent = error.message;
}

function accountLabel(account) {
  return account.accountName || account.name || 'Unnamed account';
}

function formatAddress(address) {
  if (!address) return '';
  const lines = address.addressLines || [];
  const cityLine = [address.locality, address.administrativeArea, address.postalCode]
    .filter(Boolean)
    .join(', ');
  return [...lines, cityLine].filter(Boolean).join(', ');
}

function humanDate(value) {
  if (!value) return '';
  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return value;
  return date.toLocaleDateString(undefined, {
    year: 'numeric',
    month: 'short',
    day: 'numeric'
  });
}

function starRating(value) {
  const ratings = {
    ONE: '1',
    TWO: '2',
    THREE: '3',
    FOUR: '4',
    FIVE: '5'
  };
  return ratings[value] || value || 'No rating';
}

function renderAccounts(accounts) {
  accountsEl.className = 'list';
  accountsEl.innerHTML = '';

  if (!accounts.length) {
    accountsEl.className = 'list empty';
    accountsEl.textContent = 'No Business Profile accounts were returned for this Google user.';
    return;
  }

  for (const account of accounts) {
    const button = document.createElement('button');
    button.type = 'button';
    button.className = 'account';
    button.setAttribute('aria-selected', selectedAccount === account.name ? 'true' : 'false');
    button.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
    `;
    button.querySelector('.title').textContent = accountLabel(account);
    button.querySelector('.meta').textContent = `${account.name} ${account.type ? `- ${account.type}` : ''}`;
    button.addEventListener('click', () => loadLocations(account.name));
    accountsEl.append(button);
  }
}

function renderLocations(locations) {
  locationsEl.className = 'businessGrid';
  locationsEl.innerHTML = '';
  businessCountEl.textContent = `${locations.length} found`;

  if (!locations.length) {
    locationsEl.className = 'businessGrid empty';
    locationsEl.textContent = 'No businesses were returned for this account.';
    return;
  }

  for (const location of locations) {
    const article = document.createElement('article');
    article.className = 'business';
    article.dataset.locationName = location.name;
    article.setAttribute('aria-selected', selectedLocation === location.name ? 'true' : 'false');

    const address = formatAddress(location.storefrontAddress);
    const phone = location.phoneNumbers?.primaryPhone || '';

    article.innerHTML = `
      <span class="title"></span>
      <span class="meta location-id"></span>
      <span class="meta store-code"></span>
      <span class="meta address"></span>
      <span class="meta phone"></span>
      <span class="meta website"></span>
      <button class="button small auditButton" type="button">Run audit</button>
    `;

    article.querySelector('.title').textContent = location.title || 'Untitled business';
    article.querySelector('.location-id').textContent = location.name;
    article.querySelector('.store-code').textContent = location.storeCode ? `Store code: ${location.storeCode}` : '';
    article.querySelector('.address').textContent = address;
    article.querySelector('.phone').textContent = phone;
    article.querySelector('.website').textContent = location.websiteUri || '';
    article.querySelector('.auditButton').addEventListener('click', () => loadAudit(location.name));

    locationsEl.append(article);
  }
}

function renderCompetitors(places) {
  competitorsEl.className = 'competitorGrid';
  competitorsEl.innerHTML = '';

  if (!places.length) {
    competitorsEl.className = 'competitorGrid empty';
    competitorsEl.textContent = 'No competitors found for that search.';
    return;
  }

  for (const place of places) {
    const card = document.createElement('article');
    card.className = 'competitor';
    card.innerHTML = `
      <span class="title"></span>
      <span class="meta address"></span>
      <div class="typeBlock">
        <span class="typeLabel">Primary type</span>
        <span class="typeValue primary-type"></span>
      </div>
      <div class="typeBlock">
        <span class="typeLabel">All public types</span>
        <span class="typeValue all-types"></span>
      </div>
      <div class="meta stats"></div>
      <div class="competitorLinks"></div>
    `;

    card.querySelector('.title').textContent = place.name || 'Unnamed place';
    card.querySelector('.address').textContent = place.address;
    card.querySelector('.primary-type').textContent = place.primaryTypeDisplayName || place.primaryType || 'Not returned';
    card.querySelector('.all-types').textContent = place.types.length ? place.types.join(', ') : 'No public types returned';
    card.querySelector('.stats').textContent = [
      place.rating ? `Rating: ${place.rating}` : '',
      place.userRatingCount ? `${place.userRatingCount} reviews` : '',
      place.businessStatus ? `Status: ${place.businessStatus}` : ''
    ].filter(Boolean).join(' - ');

    const links = card.querySelector('.competitorLinks');
    for (const [label, href] of [
      ['Maps', place.googleMapsUri],
      ['Website', place.websiteUri]
    ]) {
      if (!href) continue;
      const link = document.createElement('a');
      link.href = href;
      link.target = '_blank';
      link.rel = 'noreferrer';
      link.textContent = label;
      links.append(link);
    }

    if (place.nationalPhoneNumber || place.internationalPhoneNumber) {
      const phone = document.createElement('span');
      phone.className = 'meta';
      phone.textContent = place.nationalPhoneNumber || place.internationalPhoneNumber;
      links.append(phone);
    }

    competitorsEl.append(card);
  }
}

function sectionError(section) {
  const message = document.createElement('p');
  message.className = 'error sectionError';
  message.textContent = section.error;
  return message;
}

function createSection(title, section) {
  const wrapper = document.createElement('section');
  wrapper.className = 'auditSection';
  wrapper.innerHTML = `
    <div class="sectionHeader">
      <h3></h3>
      <span class="muted"></span>
    </div>
  `;
  wrapper.querySelector('h3').textContent = title;
  wrapper.querySelector('.muted').textContent = section.ok
    ? 'Loaded'
    : section.skipped
      ? 'Skipped'
      : `Not available (${section.statusCode || 'error'})`;
  return wrapper;
}

function renderReviews(section) {
  const wrapper = createSection('Reviews', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.count}</strong><small>reviews fetched</small></span>
    <span><strong>${data.averageRating ?? 'N/A'}</strong><small>average rating</small></span>
    <span><strong>${data.repliedCount}</strong><small>with replies</small></span>
    <span><strong>${data.unrepliedCount}</strong><small>without replies</small></span>
  `;

  const list = document.createElement('div');
  list.className = 'detailList';
  for (const review of data.latest || []) {
    const item = document.createElement('article');
    item.className = 'detailItem';
    item.dataset.reviewName = review.name;
    item.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
      <p></p>
      <label class="replyBox">
        <span class="meta reply"></span>
        <textarea rows="3" maxlength="4096"></textarea>
      </label>
      <div class="reviewActions">
        <button class="button small saveReply" type="button">Save reply</button>
        <button class="button small deleteReply" type="button">Delete reply</button>
        <span class="meta replyStatus" role="status"></span>
      </div>
    `;
    item.querySelector('.title').textContent = `${starRating(review.starRating)} star - ${review.reviewer?.displayName || 'Anonymous'}`;
    item.querySelector('.meta').textContent = `Updated ${humanDate(review.updateTime || review.createTime)}`;
    item.querySelector('p').textContent = review.comment || 'No written comment.';
    item.querySelector('.reply').textContent = review.reviewReply ? `Owner reply, updated ${humanDate(review.reviewReply.updateTime)}` : 'Owner reply';
    item.querySelector('textarea').value = review.reviewReply?.comment || '';
    item.querySelector('.saveReply').addEventListener('click', () => saveReviewReply(item));
    item.querySelector('.deleteReply').disabled = !review.reviewReply;
    item.querySelector('.deleteReply').addEventListener('click', () => deleteReviewReply(item));
    list.append(item);
  }

  wrapper.append(stats, list);
  return wrapper;
}

function renderServices(section) {
  const wrapper = createSection('Services', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.serviceItemCount}</strong><small>service items</small></span>
    <span><strong>${data.source || 'serviceList'}</strong><small>source</small></span>
  `;

  const list = document.createElement('div');
  list.className = 'detailList compact';
  for (const service of data.serviceItems || []) {
    const item = document.createElement('article');
    item.className = 'detailItem';
    item.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
      <p></p>
    `;
    item.querySelector('.title').textContent = service.name || 'Service';
    item.querySelector('.meta').textContent = [
      service.category ? `Category: ${service.category}` : '',
      service.isOffered === false ? 'Not offered' : 'Offered'
    ].filter(Boolean).join(' - ');
    item.querySelector('p').textContent = service.description || '';
    list.append(item);
  }

  if (!data.serviceItemCount) {
    list.className = 'empty';
    list.textContent = 'No service items returned for this location.';
  }

  wrapper.append(stats, list);
  return wrapper;
}

function renderMedia(section) {
  const wrapper = createSection('Media', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.totalMediaItemCount}</strong><small>total media items</small></span>
    <span><strong>${data.count}</strong><small>loaded in preview</small></span>
  `;

  const grid = document.createElement('div');
  grid.className = 'mediaGrid';
  for (const media of data.latest || []) {
    const link = document.createElement('a');
    link.href = media.googleUrl || media.sourceUrl || '#';
    link.target = '_blank';
    link.rel = 'noreferrer';
    link.className = 'mediaItem';
    link.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
    `;
    link.querySelector('.title').textContent = media.mediaFormat || 'Media item';
    link.querySelector('.meta').textContent = humanDate(media.createTime) || media.name || '';
    grid.append(link);
  }

  wrapper.append(stats, grid);
  return wrapper;
}

function renderPosts(section) {
  const wrapper = createSection('Posts', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.count}</strong><small>posts fetched</small></span>
  `;

  const list = document.createElement('div');
  list.className = 'detailList';
  for (const post of data.latest || []) {
    const item = document.createElement('article');
    item.className = 'detailItem';
    item.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
      <p></p>
    `;
    item.querySelector('.title').textContent = `${post.topicType || 'Post'} - ${post.state || 'unknown state'}`;
    item.querySelector('.meta').textContent = humanDate(post.updateTime || post.createTime);
    item.querySelector('p').textContent = post.summary || post.callToAction?.url || 'No summary.';
    list.append(item);
  }

  if (!data.count) {
    list.className = 'empty';
    list.textContent = 'No local posts returned for this location.';
  }

  wrapper.append(stats, list);
  return wrapper;
}

function renderAttributes(section) {
  const wrapper = createSection('Attributes', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.count}</strong><small>attributes returned</small></span>
  `;

  const list = document.createElement('div');
  list.className = 'detailList compact';
  for (const attribute of data.attributes || []) {
    const item = document.createElement('article');
    item.className = 'detailItem';
    item.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
    `;
    item.querySelector('.title').textContent = attribute.attributeId || 'Attribute';
    item.querySelector('.meta').textContent = attribute.valueType || JSON.stringify(attribute.values || attribute.repeatedEnumValue || attribute);
    list.append(item);
  }

  if (!data.count) {
    list.className = 'empty';
    list.textContent = 'No attributes returned for this location.';
  }

  wrapper.append(stats, list);
  return wrapper;
}

function renderFoodMenus(section) {
  const wrapper = createSection('Food menus', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.menuCount}</strong><small>menus</small></span>
    <span><strong>${data.sectionCount}</strong><small>sections</small></span>
    <span><strong>${data.itemCount}</strong><small>items</small></span>
  `;

  wrapper.append(stats);
  return wrapper;
}

function renderGoogleUpdated(section) {
  const wrapper = createSection('Google updates', section);
  if (!section.ok) {
    wrapper.append(sectionError(section));
    return wrapper;
  }

  const data = section.data;
  const stats = document.createElement('div');
  stats.className = 'statGrid';
  stats.innerHTML = `
    <span><strong>${data.diffMask || 'None'}</strong><small>changed fields</small></span>
    <span><strong>${data.pendingMask || 'None'}</strong><small>pending fields</small></span>
    <span><strong>${data.serviceItemCount}</strong><small>updated service items</small></span>
  `;

  const categoryBlock = document.createElement('div');
  categoryBlock.className = 'detailItem';
  categoryBlock.innerHTML = `
    <span class="title">Google-updated categories</span>
    <span class="meta primary-category"></span>
    <span class="meta additional-categories"></span>
  `;
  categoryBlock.querySelector('.primary-category').textContent = data.categories?.primary
    ? `Primary: ${data.categories.primary}`
    : 'Primary: not returned';
  categoryBlock.querySelector('.additional-categories').textContent = data.categories?.additional?.length
    ? `Additional: ${data.categories.additional.join(', ')}`
    : 'Additional: none returned';

  const list = document.createElement('div');
  list.className = 'detailList compact';

  for (const service of data.serviceItems || []) {
    const item = document.createElement('article');
    item.className = 'detailItem';
    item.innerHTML = `
      <span class="title"></span>
      <span class="meta"></span>
    `;
    item.querySelector('.title').textContent = service.name;
    item.querySelector('.meta').textContent = [
      service.category ? `Category: ${service.category}` : '',
      service.isOffered === false ? 'Not offered' : 'Offered'
    ].filter(Boolean).join(' - ');
    list.append(item);
  }

  if (!data.serviceItemCount) {
    list.className = 'empty';
    list.textContent = data.diffMask?.includes('serviceItems')
      ? 'Google reported service item changes, but did not return item details in this response.'
      : 'No Google-updated service items returned.';
  }

  wrapper.append(stats, categoryBlock, list);
  return wrapper;
}

function renderAudit(location, audit, sections = {}) {
  auditEl.className = 'audit';
  auditEl.innerHTML = '';
  auditScoreEl.textContent = `${audit.score}% complete`;

  const summary = document.createElement('div');
  summary.className = 'auditSummary';
  summary.innerHTML = `
    <div>
      <span class="score"></span>
      <span class="muted"></span>
    </div>
    <div class="auditIdentity">
      <span class="title"></span>
      <span class="meta location-id"></span>
      <span class="meta maps-link"></span>
    </div>
  `;
  summary.querySelector('.score').textContent = `${audit.passedCount}/${audit.totalCount}`;
  summary.querySelector('.muted').textContent = 'checks passed';
  summary.querySelector('.title').textContent = location.title || 'Untitled business';
  summary.querySelector('.location-id').textContent = location.name;

  const mapsLink = summary.querySelector('.maps-link');
  if (location.metadata?.mapsUri) {
    const link = document.createElement('a');
    link.href = location.metadata.mapsUri;
    link.target = '_blank';
    link.rel = 'noreferrer';
    link.textContent = 'Open on Google Maps';
    mapsLink.append(link);
  } else {
    mapsLink.textContent = location.metadata?.placeId ? `Place ID: ${location.metadata.placeId}` : '';
  }

  const checks = document.createElement('div');
  checks.className = 'checks';

  for (const check of audit.checks) {
    const row = document.createElement('div');
    row.className = check.passed ? 'check passed' : 'check missing';
    row.innerHTML = `
      <span class="checkStatus"></span>
      <span>
        <span class="title"></span>
        <span class="meta"></span>
      </span>
    `;
    row.querySelector('.checkStatus').textContent = check.passed ? 'OK' : 'Missing';
    row.querySelector('.title').textContent = check.label;
    row.querySelector('.meta').textContent = check.detail;
    checks.append(row);
  }

  const details = document.createElement('div');
  details.className = 'auditSections';
  details.append(
    renderReviews(sections.reviews),
    renderServices(sections.services),
    renderMedia(sections.media),
    renderPosts(sections.posts),
    renderAttributes(sections.attributes),
    renderFoodMenus(sections.foodMenus),
    renderGoogleUpdated(sections.googleUpdated)
  );

  auditEl.append(summary, checks, details);
}

async function loadStatus() {
  const { connected } = await api('/api/status');
  setConnectionState(connected);

  if (connected) {
    await loadAccounts();
  }
}

async function loadAccounts() {
  accountsEl.className = 'list empty';
  accountsEl.textContent = 'Loading accounts...';
  locationsEl.className = 'businessGrid empty';
  locationsEl.textContent = 'Select an account to load businesses.';
  businessCountEl.textContent = '';
  auditEl.className = 'audit empty';
  auditEl.textContent = 'Select a business to run the first audit.';
  auditScoreEl.textContent = '';

  try {
    const { accounts } = await api('/api/accounts');
    renderAccounts(accounts);
  } catch (error) {
    showError(accountsEl, error);
  }
}

async function loadLocations(accountName) {
  selectedAccount = accountName;
  selectedLocation = null;
  for (const account of accountsEl.querySelectorAll('.account')) {
    account.setAttribute('aria-selected', account.textContent.includes(accountName) ? 'true' : 'false');
  }

  locationsEl.className = 'businessGrid empty';
  locationsEl.textContent = 'Loading businesses...';
  businessCountEl.textContent = '';
  auditEl.className = 'audit empty';
  auditEl.textContent = 'Select a business to run the first audit.';
  auditScoreEl.textContent = '';

  try {
    const { locations } = await api(`/api/locations?account=${encodeURIComponent(accountName)}`);
    renderLocations(locations);
  } catch (error) {
    businessCountEl.textContent = '';
    showError(locationsEl, error);
  }
}

async function loadAudit(locationName) {
  selectedLocation = locationName;
  currentAuditLocation = locationName;
  for (const business of locationsEl.querySelectorAll('.business')) {
    business.setAttribute('aria-selected', business.dataset.locationName === locationName ? 'true' : 'false');
  }

  auditEl.className = 'audit empty';
  auditEl.textContent = 'Running audit...';
  auditScoreEl.textContent = '';

  try {
    const query = new URLSearchParams({
      account: selectedAccount,
      location: locationName
    });
    const { location, audit, sections } = await api(`/api/audit?${query.toString()}`);
    renderAudit(location, audit, sections);
  } catch (error) {
    showError(auditEl, error);
  }
}

async function saveReviewReply(item) {
  const status = item.querySelector('.replyStatus');
  const saveButton = item.querySelector('.saveReply');
  const deleteButton = item.querySelector('.deleteReply');
  const textarea = item.querySelector('textarea');
  const comment = textarea.value.trim();

  if (!comment) {
    status.textContent = 'Reply cannot be empty.';
    return;
  }

  saveButton.disabled = true;
  deleteButton.disabled = true;
  status.textContent = 'Saving...';

  try {
    await jsonApi('/api/reviews/reply', 'PUT', {
      account: selectedAccount,
      location: selectedLocation,
      review: item.dataset.reviewName,
      comment
    });
    status.textContent = 'Saved.';
    await loadAudit(currentAuditLocation);
  } catch (error) {
    status.textContent = error.message;
    saveButton.disabled = false;
    deleteButton.disabled = false;
  }
}

async function deleteReviewReply(item) {
  const status = item.querySelector('.replyStatus');
  const saveButton = item.querySelector('.saveReply');
  const deleteButton = item.querySelector('.deleteReply');

  saveButton.disabled = true;
  deleteButton.disabled = true;
  status.textContent = 'Deleting...';

  try {
    await jsonApi('/api/reviews/reply', 'DELETE', {
      account: selectedAccount,
      location: selectedLocation,
      review: item.dataset.reviewName
    });
    status.textContent = 'Deleted.';
    await loadAudit(currentAuditLocation);
  } catch (error) {
    status.textContent = error.message;
    saveButton.disabled = false;
    deleteButton.disabled = false;
  }
}

disconnectButton.addEventListener('click', async () => {
  await api('/logout', { method: 'POST' });
  setConnectionState(false);
  selectedAccount = null;
  selectedLocation = null;
  currentAuditLocation = null;
  accountsEl.className = 'list empty';
  accountsEl.textContent = 'Connect a Google account to load accounts.';
  locationsEl.className = 'businessGrid empty';
  locationsEl.textContent = 'Select an account to load businesses.';
  businessCountEl.textContent = '';
  auditEl.className = 'audit empty';
  auditEl.textContent = 'Select a business to run the first audit.';
  auditScoreEl.textContent = '';
});

refreshAccountsButton.addEventListener('click', loadAccounts);

competitorForm.addEventListener('submit', async (event) => {
  event.preventDefault();
  const query = competitorQueryInput.value.trim();
  if (!query) return;

  competitorsEl.className = 'competitorGrid empty';
  competitorsEl.textContent = 'Searching competitors...';

  try {
    const params = new URLSearchParams({ q: query, limit: '10' });
    const { places } = await api(`/api/competitors/search?${params.toString()}`);
    renderCompetitors(places);
  } catch (error) {
    showError(competitorsEl, error);
  }
});

loadStatus().catch((error) => {
  setConnectionState(false);
  showError(accountsEl, error);
});