<?php
// transit/broadcast/send.php — المشرف يرسل إعلاناً للطلاب عبر FCM

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

requireTransitFields(['body_ar']);

$bodyAr     = filterRequest('body_ar');
$titleAr    = filterRequest('title_ar') ?: 'إعلان من الجامعة';
$targetType = filterRequest('target_type') ?: 'all';
$targetId   = filterRequest('target_id', 'int') ?: null;

if (!in_array($targetType, ['all', 'route'])) $targetType = 'all';

// عند استهداف خط: تأكد أن الخط يخص مؤسسة هذا المشرف — يمنع البث لخط مؤسسة أخرى
if ($targetType === 'route' && $targetId) {
    $chkRoute = $transit_con->prepare("SELECT id FROM transit_routes WHERE id=? AND org_id=? LIMIT 1");
    $chkRoute->execute([$targetId, $transit_org_id]);
    if (!$chkRoute->fetch()) jsonError('Route not found or access denied', 404);
}

$fcmTopic = ($targetType === 'route' && $targetId)
    ? transitRouteTopic($targetId)
    : transitOrgTopic($transit_org_id);

$transit_con->prepare(
    "INSERT INTO transit_broadcasts
     (org_id, sent_by, target_type, target_id, title_ar, body_ar, fcm_topic, sent_at)
     VALUES (?,?,?,?,?,?,?,NOW())"
)->execute([$transit_org_id, $transit_admin_id, $targetType, $targetId, $titleAr, $bodyAr, $fcmTopic]);

$broadcastId = (int)$transit_con->lastInsertId();

transitSendTopicNotification(
    $fcmTopic, $titleAr, $bodyAr,
    ['type' => 'transit_broadcast', 'broadcast_id' => (string)$broadcastId]
);

jsonSuccess(['broadcast_id' => $broadcastId, 'fcm_topic' => $fcmTopic], 'Broadcast sent');