tablet-checkin/backend/extension-src/content-script.js

// Injects a "Send to Tablet" button next to two different shapes of
// NewBook's own Check In button, on whichever pages carry them (see
// manifest.json's content_scripts.matches) — the popup covers single-booking
// pages independently of this, this is purely about inline injection:
// 1. Each row of the "due for arrival" list (bookings_lists_checkin).
// 2. The "This Booking is due to Arrive today. Do you want to go to
//    Check-In?" reminder banner NewBook shows inline (confirmed 2026-09-01
//    from a real sample — a `.newbook_message.plain` block, most likely on
//    bookings_view/edit but the exact page isn't nailed down, hence the
//    slightly broader matches list below rather than one exact page).
//
// Both shapes share the same "generic_button_1"-is-not-actually-unique
// gotcha (NewBook reuses that id on every instance of its own Check In
// button, confirmed 2026-09-01) — this script never relies on ids from
// NewBook's own markup for either shape, only class/attribute selectors
// scoped to each button's own container. Booking-ID extraction differs
// between the two shapes though: the list row carries it in a checkbox's
// `value` (see extractBookingIdFromRow), the banner button only carries it
// inside its `onclick` attribute's URL (see extractBookingIdFromOnclick) —
// there's no separate structured attribute for it there.
//
// MutationObserver pattern (watching for AJAX-refreshed content, not just
// initial page load) is the same approach chrome-newbook-assistant already
// had to use for this same NewBook UI (~/laptop-archive) — this system
// clearly refreshes content via AJAX (see the `via_ajax` tooltip classes in
// the row sample) without a full page reload, so a one-time scan on
// document_idle alone would miss content added/replaced afterward.

const PROCESSED_ATTR = 'data-tcp-processed';

function extractBookingIdFromRow(row) {
  const checkbox = row.querySelector('input.booking_id_checkbox');
  if (checkbox?.value) return checkbox.value;
  // Fallback: class name carries it too (`booking_37117`) — confirmed from
  // the sample row, kept as a fallback in case a future NewBook markup
  // change drops the checkbox but keeps the class.
  const match = row.className.match(/\bbooking_(\d+)\b/);
  return match ? match[1] : null;
}

// The reminder banner's Check In button has no separate booking-ID
// attribute at all — only its onclick handler carries it, embedded in the
// NewBook URL it navigates to: load_url("https://.../bookings_checkin/37129")
function extractBookingIdFromOnclick(button) {
  const onclick = button.getAttribute('onclick') || '';
  const match = onclick.match(/bookings_checkin\/(\d+)/);
  return match ? match[1] : null;
}

// Same URL shape as background.js/popup.js's BOOKING_URL_RE — re-derived here
// too since this needs to resolve synchronously inside the MutationObserver
// callback (menu items and bookings_checkin's own Confirm Check-In link
// carry no separate booking-id attribute at all, unlike the row/banner
// shapes above).
const MENU_BOOKING_URL_RE = /\/bookings_(?:view|edit|checkin)\/(\d+)/i;
function extractBookingIdFromLocation() {
  const match = window.location.href.match(MENU_BOOKING_URL_RE);
  return match ? match[1] : null;
}

function extractGuestName(row) {
  // The guest/company link's own text node — tooltip content is a sibling
  // element (easytooltip_content), not part of the visible text, so a plain
  // textContent read on the link itself would double up with it. Grab just
  // the first non-empty text child instead.
  const link = row.querySelector('a.easytooltip[class*="booking_"]');
  if (!link) return '';
  for (const node of link.childNodes) {
    if (node.nodeType === Node.TEXT_NODE && node.textContent.trim()) {
      return node.textContent.trim();
    }
  }
  return link.textContent.trim();
}

function findCheckInCell(row) {
  const btn = row.querySelector('button[aria-label="Check In"]');
  return btn ? btn.closest('td') : null;
}

// variant 'block' = full-width, stacked below the anchor (table cell — the
// list row context, where width is already constrained by the column).
// variant 'inline' = sized to its own content, sitting next to the anchor
// (the reminder banner context, which flows inline with other text/buttons
// rather than living in a narrow fixed-width cell).
// Reuses NewBook's own `.button` class (and `.most_width` for the row
// variant) rather than hand-rolled CSS, so the injected button inherits
// NewBook's real height/padding/border-radius/font and sits flush with its
// own Check In button — only the colour is overridden, to keep it visually
// distinct as a non-native action. The tablet icon is Font Awesome, already
// loaded by NewBook itself for its own icons (e.g. fa-concierge-bell on
// Check In), so no extra asset is needed.
function makeSendButton(bookingId, guestName, variant = 'block') {
  const btn = document.createElement('button');
  btn.id = `tcp-btn-${bookingId}-${variant}`;
  btn.type = 'button';
  btn.className = variant === 'block' ? 'button most_width' : 'button';
  btn.innerHTML = '<i class="far fa-tablet-alt fa-fw" aria-hidden="true"></i> <span>Tablet Push</span>';
  btn.style.cssText = `
    ${variant === 'block' ? 'margin-top: 6px;' : 'margin-right: 8px;'}
    background: #be123c; border-color: #be123c; color: #fff;
  `;
  btn.addEventListener('click', e => {
    e.preventDefault();
    e.stopPropagation();
    handleSendClick(btn, bookingId, guestName, variant);
  });
  return btn;
}

// Injected buttons skip asking which tablet entirely when a default is
// configured for this machine (see options.js) — push straight to it. Only
// falls back to the full device-picker panel if that specific push comes
// back busy (409), or if no default is configured at all — see
// project_checkin memory's extension notes, this was an explicit UX request
// ("injected buttons don't need to ask which tablet, just use/send to
// default unless busy"). The popup is deliberately different — it always
// shows the picker, just pre-selected to the default (see popup.js) — since
// opening the popup is already a more deliberate action than a one-click
// inline button.
async function handleSendClick(anchorBtn, bookingId, guestName, variant) {
  const { defaultDeviceId } = await chrome.storage.local.get('defaultDeviceId');

  if (defaultDeviceId) {
    const status = showInlineStatus(anchorBtn, variant, 'Sending…');
    let result;
    try {
      result = await chrome.runtime.sendMessage({ action: 'tcpPush', bookingId, deviceId: defaultDeviceId });
    } catch {
      status.textContent = 'Extension was reloaded — refresh this NewBook page and try again.';
      return;
    }
    if (result?.ok) {
      status.textContent = 'Sent — the tablet should navigate now.';
      status.style.color = '#166534';
      return;
    }
    if (result?.status === 409) {
      status.remove();
      // fall through to the picker below, with a note explaining why it's
      // asking despite a default being configured
      await togglePanel(anchorBtn, bookingId, guestName, variant, 'Default tablet is busy — choose another:');
      return;
    }
    status.textContent = `Failed: ${result?.error || 'unknown error'}`;
    status.style.color = '#dc2626';
    return;
  }

  await togglePanel(anchorBtn, bookingId, guestName, variant);
}

// The context-menu buttons (variant 'menu') live inside a horizontal nav
// bar <li> — inserting a block-level status/panel 'afterend' there (like the
// row/banner variants do) would stretch that menu item's row height instead
// of floating over the page. Anchoring to the viewport via the button's own
// bounding rect sidesteps needing the menu bar to be a positioned ancestor.
function positionFloating(el, anchorBtn) {
  const rect = anchorBtn.getBoundingClientRect();
  el.style.position = 'fixed';
  el.style.top = `${rect.bottom + 4}px`;
  el.style.left = `${rect.left}px`;
  el.style.zIndex = '99999';
}

// Small text-only status line for the default-tablet fast path — no
// dropdown, nothing to pick, just feedback on what happened.
function showInlineStatus(anchorBtn, variant, text) {
  if (openPanel) { openPanel.remove(); openPanel = null; }
  const el = document.createElement('div');
  const width = variant === 'block' ? 'width: 100%;' : '';
  const floating = variant === 'menu';
  el.style.cssText = `
    display: block; ${floating ? '' : 'margin-top: 6px;'} ${width} font-size: 12px; color: #64748b;
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    ${floating ? 'background: #fff; padding: 6px 10px; border-radius: 6px; box-shadow: 0 2px 8px rgba(0,0,0,0.15);' : ''}
  `;
  el.textContent = text;
  if (floating) {
    document.body.appendChild(el);
    positionFloating(el, anchorBtn);
  } else {
    anchorBtn.insertAdjacentElement('afterend', el);
  }
  openPanel = el;
  return el;
}

let openPanel = null;

async function togglePanel(anchorBtn, bookingId, guestName, variant = 'block', note = '') {
  if (openPanel) { openPanel.remove(); openPanel = null; }

  const panel = document.createElement('div');
  // Always its own block below the anchor regardless of variant — an inline
  // anchor (the banner button) has no full-width block context to size
  // against naturally, so give it an explicit min-width instead of relying
  // on parent width like the row-cell variant can.
  const floating = variant === 'menu';
  const width = variant === 'block' ? 'width: 100%;' : 'min-width: 200px; max-width: 280px;';
  panel.style.cssText = `
    display: block; ${floating ? '' : 'margin-top: 6px;'} ${width} padding: 8px; background: #f4f5f7;
    border: 1px solid #e4e8ee; border-radius: 8px;
    ${floating ? 'box-shadow: 0 2px 10px rgba(0,0,0,0.2);' : ''}
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 12px; color: #1e293b;
  `;
  panel.textContent = note ? `${note} loading…` : 'Loading tablets…';
  if (floating) {
    document.body.appendChild(panel);
    positionFloating(panel, anchorBtn);
  } else {
    anchorBtn.insertAdjacentElement('afterend', panel);
  }
  openPanel = panel;

  // A stale content script (injected before the extension was last
  // reloaded) throws "Extension context invalidated" the moment it touches
  // chrome.runtime here — sendMessage() rejects rather than hanging, but an
  // uncaught rejection previously left the panel stuck on "Loading
  // tablets…" forever with no feedback at all. Reloading the extension does
  // NOT re-inject content scripts into already-open tabs; only a full page
  // refresh does that (hit for real 2026-09-01, see project_checkin memory).
  let res;
  try {
    res = await chrome.runtime.sendMessage({ action: 'tcpListDevices' });
  } catch {
    panel.textContent = 'Extension was reloaded — refresh this NewBook page and try again.';
    return;
  }
  if (!res?.ok) {
    panel.textContent = `Could not load tablets: ${res?.error || 'not configured yet — see extension Settings'}`;
    return;
  }
  if (!res.devices.length) {
    panel.textContent = 'No tablets registered yet.';
    return;
  }

  const select = document.createElement('select');
  select.style.cssText = 'width: 100%; margin-bottom: 6px; padding: 4px;';
  select.innerHTML = res.devices.map(d =>
    `<option value="${d.device_id}" ${d.status === 'busy' ? 'disabled' : ''}>${escapeHtml(d.name)}${d.status === 'busy' ? ' (busy)' : ''}</option>`
  ).join('');

  const sendBtn = document.createElement('button');
  sendBtn.textContent = `Send${guestName ? ` — ${guestName}` : ''}`;
  sendBtn.style.cssText = `
    width: 100%; padding: 4px 8px; background: #c9a84c; color: #1a1a2e;
    border: none; border-radius: 6px; font-weight: 600; cursor: pointer;
  `;
  sendBtn.addEventListener('click', async () => {
    sendBtn.disabled = true;
    sendBtn.textContent = 'Sending…';
    const result = await chrome.runtime.sendMessage({
      action: 'tcpPush', bookingId, deviceId: select.value,
    });
    if (result?.ok) {
      panel.textContent = 'Sent — the tablet should navigate now.';
    } else {
      panel.textContent = `Failed: ${result?.error || 'unknown error'}`;
    }
  });

  panel.innerHTML = '';
  if (note) {
    const noteEl = document.createElement('div');
    noteEl.textContent = note;
    noteEl.style.cssText = 'margin-bottom: 6px; color: #b45309; font-weight: 600;';
    panel.appendChild(noteEl);
  }
  panel.appendChild(select);
  panel.appendChild(sendBtn);
}

function escapeHtml(s) {
  const div = document.createElement('div');
  div.textContent = s;
  return div.innerHTML;
}

// Context-menu entries use a completely different markup shape than the
// .button-based row/banner injections above — <li><a><div class="page_icon">
// <i/></div><span/></a></li> — so this builds that shape directly rather
// than reusing makeSendButton. Click handling (default-tablet fast path,
// picker fallback) is identical, via the 'menu' variant plumbed through
// handleSendClick/showInlineStatus/togglePanel above.
function makeMenuLink(bookingId) {
  const li = document.createElement('li');
  li.className = 'context tcp-menu-item';
  const a = document.createElement('a');
  a.href = '#';
  a.innerHTML = `
    <div class="page_icon"><i class="far fa-tablet-alt fa-fw" alt="" style="margin-right: 0; margin-left: 0px; vertical-align: middle; font-size: 24px;" aria-hidden="true"></i></div>
    <span>Tablet Push</span>
  `;
  a.addEventListener('click', e => {
    e.preventDefault();
    e.stopPropagation();
    handleSendClick(a, bookingId, '', 'menu');
  });
  li.appendChild(a);
  return li;
}

// The top (#context-menu-header) and bottom (#context-menu-footer) nav bars
// on bookings_checkin/<id> — NewBook clears each one (`.html("")`) and
// rebuilds it from a fixed sequence of `.append()` calls on every load/AJAX
// navigation, always ending with "Confirm Check-In" (identified by its
// `a.checkin_button` class — the only stable marker across both nav bars and
// the "More" dropdown they sometimes collapse into on narrow viewports).
// Inserting immediately before that <li> is what the user asked for
// ("both of those to the left of the default checkin button"). No
// PROCESSED_ATTR here — the clear+rebuild wipes our injected <li> along with
// everything else, so re-running this on every mutation is what makes it
// self-healing rather than a bug; the previousElementSibling check below is
// what keeps it from double-inserting within a single rebuild.
function injectCheckinMenuButton(container) {
  if (!container) return;
  const checkinLink = container.querySelector('a.checkin_button');
  if (!checkinLink) return;
  const checkinLi = checkinLink.closest('li');
  if (!checkinLi || checkinLi.previousElementSibling?.classList.contains('tcp-menu-item')) return;

  const bookingId = extractBookingIdFromLocation();
  if (!bookingId) return;

  checkinLi.insertAdjacentElement('beforebegin', makeMenuLink(bookingId));
}

// Looked up by id directly (not scoped to whatever `root` the observer
// happened to pass in) because NewBook's rebuild adds the menu <li>s one at
// a time — when one of those individual <li>s is itself the mutation's
// added node, it doesn't contain '#context-menu-header' as a descendant, so
// a root-scoped querySelector would silently miss it.
function processCheckinMenus() {
  injectCheckinMenuButton(document.getElementById('context-menu-header'));
  injectCheckinMenuButton(document.getElementById('context-menu-footer'));
}

// Dedicated banner on bookings_checkin/<id>, purely for "send this guest to
// a tablet instead" — distinct from processCheckinBanner above, which
// detects and augments NewBook's own existing arrival reminder on
// bookings_view. Reuses NewBook's own `.newbook_message.plain` class for
// free styling consistency (same approach as makeSendButton reusing
// `.button`), positioned directly above the Mandatory/Optional Information
// tabs as requested.
function buildTabletBanner(bookingId) {
  const banner = document.createElement('div');
  banner.className = 'newbook_message plain';
  banner.innerHTML = `
    <i class="message_icon far fa-info-circle fa-fw" alt="" style="vertical-align: middle;font-size:16px;" aria-hidden="true"></i>
    <div class="nb-header">Information</div>
    <div class="indent"><div class="note_output"><div class="note_text">Prefer the guest to complete this on a tablet instead?</div></div></div>
  `;
  banner.querySelector('.note_text').appendChild(makeSendButton(bookingId, '', 'inline'));
  return banner;
}

function processCheckinPageBanner() {
  const tablist = document.querySelector('ul[role="tablist"].ui-tabs-nav');
  if (!tablist || tablist.hasAttribute(PROCESSED_ATTR)) return;
  const bookingId = extractBookingIdFromLocation();
  if (!bookingId) return;

  tablist.setAttribute(PROCESSED_ATTR, '1');
  tablist.insertAdjacentElement('beforebegin', buildTabletBanner(bookingId));
}

function processRow(row) {
  if (row.hasAttribute(PROCESSED_ATTR)) return;
  const bookingId = extractBookingIdFromRow(row);
  const cell = findCheckInCell(row);
  if (!bookingId || !cell) return; // not a real booking row, or no Check In button in it

  row.setAttribute(PROCESSED_ATTR, '1');
  cell.appendChild(makeSendButton(bookingId, extractGuestName(row), 'block'));
}

// The "due to Arrive today" reminder banner on bookings_view pages
// (confirmed 2026-09-01 — see the class comment at the top of this file).
// Scoped specifically to a Check In button sitting inside a
// .newbook_message.plain block, not just any button with that aria-label
// anywhere on the page, so this can't accidentally match something
// unrelated that happens to reuse the same label.
function processCheckinBanner(button) {
  if (button.hasAttribute(PROCESSED_ATTR)) return;
  const bookingId = extractBookingIdFromOnclick(button);
  if (!bookingId) return;

  button.setAttribute(PROCESSED_ATTR, '1');
  // NewBook floats these buttons right, so the earlier element in DOM order
  // ends up rightmost visually — 'beforebegin' puts ours to the right of
  // Check In (not 'afterend', which would float it to the left instead).
  button.insertAdjacentElement('beforebegin', makeSendButton(bookingId, '', 'inline'));
}

function scanForRows(root = document) {
  root.querySelectorAll('tr.checkbox_row').forEach(processRow);
}

function scanForBanners(root = document) {
  root.querySelectorAll('.newbook_message.plain .note_text button[aria-label="Check In"]')
    .forEach(processCheckinBanner);
}

function scanAll(root = document) {
  scanForRows(root);
  scanForBanners(root);
  processCheckinMenus();
  processCheckinPageBanner();
}

scanAll();

const observer = new MutationObserver(mutations => {
  for (const m of mutations) {
    for (const node of m.addedNodes) {
      if (node.nodeType !== Node.ELEMENT_NODE) continue;
      if (node.matches?.('tr.checkbox_row')) processRow(node);
      else scanAll(node);
    }
  }
});
observer.observe(document.body, { childList: true, subtree: true });