tablet-checkin/backend/extension-src/background.js

// Background service worker — detects when the active tab is a NewBook
// booking page and shows a badge, so staff notice the extension has
// something to offer before even opening the popup. Tab-update/activated/
// history-state listeners and the booking-ID regex are adapted directly from
// chrome-newbook-assistant/background.js (~/laptop-archive) — that pattern
// is already proven working against real NewBook navigation (including its
// SPA-style in-page routing, hence the webNavigation listener), not
// reinvented here. See project_checkin memory's "Standalone push extension".

// Confirmed 2026-09-01 by the user directly (real NewBook page URLs):
// bookings_view/<id>, bookings_edit/<id>, bookings_checkin/<id>.
const BOOKING_URL_RE = /\/bookings_(?:view|edit|checkin)\/(\d+)/i;
const NEWBOOK_HOSTS = ['appeu.newbook.cloud', 'login.newbook.cloud'];

function isNewBookUrl(url) {
  try {
    const u = new URL(url);
    return NEWBOOK_HOSTS.some(h => u.hostname === h);
  } catch {
    return false;
  }
}

async function handleTabUpdate(tabId, url) {
  if (!url || !isNewBookUrl(url)) {
    await chrome.action.setBadgeText({ tabId, text: '' });
    return;
  }

  const match = url.match(BOOKING_URL_RE);
  if (match) {
    const bookingId = match[1];
    await chrome.storage.session.set({ [`bookingId:${tabId}`]: bookingId });
    await chrome.action.setBadgeText({ tabId, text: '→' }); // →
    await chrome.action.setBadgeBackgroundColor({ tabId, color: '#be123c' });
    await chrome.action.setTitle({ tabId, title: `Send booking #${bookingId} to a check-in tablet` });
  } else {
    await chrome.storage.session.remove(`bookingId:${tabId}`);
    await chrome.action.setBadgeText({ tabId, text: '' });
    await chrome.action.setTitle({ tabId, title: 'Send to Check-In Tablet' });
  }
}

chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (changeInfo.status === 'complete' && tab.url) handleTabUpdate(tabId, tab.url);
});

chrome.tabs.onActivated.addListener(async ({ tabId }) => {
  const tab = await chrome.tabs.get(tabId);
  if (tab.url) handleTabUpdate(tabId, tab.url);
});

// NewBook's booking view is (per chrome-newbook-assistant's own findings) an
// SPA that can change URL without a full page load — this catches that case,
// same as the assistant already has to.
chrome.webNavigation.onHistoryStateUpdated.addListener(details => {
  handleTabUpdate(details.tabId, details.url);
});

// ── Messages from content-script.js (bookings_lists_checkin row buttons) ───
// Content scripts route their actual network calls through here rather than
// fetching directly — keeps the baseUrl/apiKey read-and-fetch logic in one
// place instead of duplicated across popup.js and content-script.js.
chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
  if (message.action === 'tcpListDevices') {
    listDevices().then(sendResponse);
    return true; // keep the message channel open for the async response
  }
  if (message.action === 'tcpPush') {
    pushBooking(message.bookingId, message.deviceId).then(sendResponse);
    return true;
  }
  return false;
});

async function getConfig() {
  const { baseUrl, apiKey } = await chrome.storage.local.get(['baseUrl', 'apiKey']);
  return { baseUrl, apiKey };
}

async function listDevices() {
  const { baseUrl, apiKey } = await getConfig();
  if (!baseUrl || !apiKey) return { ok: false, error: 'not configured' };
  try {
    const res = await fetch(`${baseUrl}/api/staff/devices`, {
      headers: { Authorization: `Bearer ${apiKey}` },
    });
    const body = await res.json().catch(() => ({}));
    if (!res.ok) return { ok: false, error: body.error || `HTTP ${res.status}` };
    return { ok: true, devices: body };
  } catch (err) {
    return { ok: false, error: err.message };
  }
}

async function pushBooking(bookingId, deviceId) {
  const { baseUrl, apiKey } = await getConfig();
  if (!baseUrl || !apiKey) return { ok: false, error: 'not configured' };
  try {
    const res = await fetch(`${baseUrl}/api/staff/push`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${apiKey}` },
      body: JSON.stringify({ booking_id: bookingId, device_id: deviceId }),
    });
    const body = await res.json().catch(() => ({}));
    // status included so callers can reliably tell "device busy" (409) apart
    // from other failures — used by content-script.js's default-tablet
    // fast-path to decide whether to fall back to the device picker.
    if (!res.ok) return { ok: false, status: res.status, error: body.error || `HTTP ${res.status}` };
    return { ok: true, status: res.status };
  } catch (err) {
    return { ok: false, error: err.message };
  }
}