<?php
// transit/notification/subscribe.php — الراكب يشترك في إشعارات خط (FCM Topic)

require_once __DIR__ . '/../../transit/connect_app.php';

requireTransitFields(['route_id', 'fcm_token']);

$routeId  = filterRequest('route_id', 'int');
$fcmToken = filterRequest('fcm_token');
$stopId   = filterRequest('preferred_stop_id', 'int') ?: null;

// تحقق العضوية النشطة في المؤسسة المالكة للخط
$chk = $transit_con->prepare(
    "SELECT e.id
     FROM transit_enrollments e
     JOIN transit_routes r ON r.org_id = e.org_id
     WHERE r.id=? AND e.passenger_id=? AND e.status='active' LIMIT 1"
);
$chk->execute([$routeId, $transit_user_id]);
if (!$chk->fetch()) jsonError('Active enrollment required to subscribe', 403);

if ($stopId) {
    $transit_con->prepare(
        "UPDATE transit_enrollments
         SET preferred_stop_id=?, preferred_route_id=?
         WHERE passenger_id=? AND org_id=(SELECT org_id FROM transit_routes WHERE id=? LIMIT 1)"
    )->execute([$stopId, $routeId, $transit_user_id, $routeId]);
}

$topic = transitRouteTopic($routeId);

// اشتراك FCM Topic يتم من التطبيق مباشرة (firebaseMessaging.subscribeToTopic)
// هنا نسجّل فقط المحطة المفضلة ونؤكد الموضوع
appLog("[TRANSIT][NOTIFY] passenger {$transit_user_id} subscribed to {$topic}");

jsonSuccess([
    'topic'              => $topic,
    'preferred_stop_id'  => $stopId,
], 'Subscribed to route notifications');