// ─── Configuration ───────────────────────────────────────────────────────────

// Form ID of the notifications app (find in the URL when viewing the form)
const NOTIFICATIONS_FORM_ID = 'YOUR-NOTIFICATIONS-FORM-ID-HERE';

// Field keys from the notifications app (found in the form builder or via API)
const FIELD_KEYS = {
  title:          'YOUR-TITLE-FIELD-KEY',         // Text field: notification headline
  message:        'YOUR-MESSAGE-FIELD-KEY',        // Text field: notification body
  allowedRoles:   'YOUR-ROLES-FIELD-KEY',          // Choice field: roles to target (blank = all)
  expirationDate: 'YOUR-EXPIRATION-DATE-FIELD-KEY' // Date field: when to stop showing (blank = never)
};

// Storage key used to track the last notification the user dismissed
const STORAGE_KEY = 'lastReceivedMessage';

// ─── Main Logic ──────────────────────────────────────────────────────────────

let storage = STORAGE();

// Initialize the "last seen" timestamp in storage if this is the first run
if (!storage.getItem(STORAGE_KEY)) {
  storage.setItem(STORAGE_KEY, 0);
}

// Parse a YYYY-MM-DD date field as a local calendar date and return the end of
// that day, so a notification stays visible through its expiration date
// regardless of the device's time zone.
function endOfLocalDay(dateStr) {
  const [year, month, day] = dateStr.split('-').map(Number);
  return new Date(year, month - 1, day, 23, 59, 59, 999).getTime();
}

ON('load-record', () => {
  // Fetch only the most recent notifications, newest first, so form open time
  // doesn't grow as the notifications app accumulates records.
  // (limit/order require Fulcrum mobile app 2502.2.0+)
  LOADRECORDS({
    form_id: NOTIFICATIONS_FORM_ID,
    order: [['updated_at', 'desc']],
    limit: 25
  }, (err, result) => {
    if (err) {
      console.log(INSPECT(err));
      return;
    }

    const notificationRecords = result.records;

    if (!notificationRecords || notificationRecords.length === 0) return;

    const lastSeen = Number(storage.getItem(STORAGE_KEY)) || 0;

    for (const rec of notificationRecords) {
      // Convert the notification's last-updated timestamp to milliseconds
      const messageTimestamp = new Date(rec.updated_at).getTime();

      // Records are sorted newest first, so once we reach one the user has
      // already seen, every remaining record is older and can be skipped.
      if (messageTimestamp <= lastSeen) break;

      // Get the roles this notification is targeted to (null = everyone)
      const allowedRoles = rec.form_values?.[FIELD_KEYS.allowedRoles]
        ? CHOICEVALUES(rec.form_values[FIELD_KEYS.allowedRoles])
        : null;

      // Get the expiration date, if set (as the end of that calendar day)
      const expirationValue = rec.form_values?.[FIELD_KEYS.expirationDate];
      const expiresAt = expirationValue ? endOfLocalDay(expirationValue) : null;

      // Check if this notification is targeted to the current user's role
      const isTargeted = allowedRoles === null || allowedRoles.includes(ROLE());
      if (!isTargeted) continue;

      // Check if the notification has expired
      const isExpired = expiresAt !== null && Date.now() > expiresAt;
      if (isExpired) continue;

      // Display the notification and mark it as seen when the user dismisses it
      CONFIRM(
        rec.form_values[FIELD_KEYS.title],   // Dialog title
        rec.form_values[FIELD_KEYS.message], // Dialog body
        function () {
          // Keep the newest dismissed timestamp so this and any older
          // notifications won't show again
          const current = Number(storage.getItem(STORAGE_KEY)) || 0;
          storage.setItem(STORAGE_KEY, Math.max(current, messageTimestamp));
        }
      );
    }
  });
});