<?php
/**
 * cron_silent_push_inactive.php
 * Cron job to send a Silent Push Notification to inactive users,
 * forcing their app to wake up in the background and report their current location.
 * Run this periodically (e.g., every few hours or once a day).
 */

require_once __DIR__ . '/../connect.php';
require_once __DIR__ . '/../core/Services/FcmService.php';

// Target users who haven't updated their location in the last 24 hours
// but have a valid FCM token.
// Adjust the timeframe based on your strategy.
$sql = "
    SELECT p.id as passenger_id, t.token
    FROM passengers p
    JOIN tokens t ON p.id = t.passengerID
    LEFT JOIN passenger_opening_locations pol ON p.id = pol.start_location
    WHERE (pol.date IS NULL OR pol.date < DATE_SUB(NOW(), INTERVAL 24 HOUR))
    GROUP BY p.id, t.token
    LIMIT 500 -- Batch size to avoid overloading the server or getting rate-limited
";

$stmt = $con->prepare($sql);
$stmt->execute();
$inactiveUsers = $stmt->fetchAll(PDO::FETCH_ASSOC);

$sentCount = 0;
$fcmService = new FcmService(); // Assuming we have an FcmService or we can use sendFcmNotification directly if it's in functions.php

// In Siro, encryptionHelper is typically used for tokens. Assuming it's required here:
require_once __DIR__ . '/../core/Security/EncryptionHelper.php';
$encryptionHelper = new EncryptionHelper();

foreach ($inactiveUsers as $user) {
    $passengerId = $user['passenger_id'];
    $encryptedToken = $user['token'];
    
    $decryptedToken = $encryptionHelper->decryptData($encryptedToken);
    
    if ($decryptedToken) {
        // Send a silent push notification.
        // A silent push doesn't have a 'notification' payload (title/body), 
        // it only has a 'data' payload with 'content-available' => 1 for iOS.
        
        $dataPayload = [
            'type' => 'location_sync_request',
            'action' => 'wake_up'
        ];
        
        // This is a pseudo implementation relying on your existing push notification setup.
        // Ensure that your FCM implementation correctly maps 'content-available' for iOS.
        sendSilentFcmNotification($decryptedToken, $dataPayload);
        $sentCount++;
    }
}

echo "Silent Push triggered for $sentCount inactive users.\n";

/**
 * Helper to send Silent FCM
 */
function sendSilentFcmNotification($token, $data) {
    // Basic curl request to FCM API for silent push
    $url = 'https://fcm.googleapis.com/fcm/send';
    
    // Replace with your actual server key
    $serverKey = getenv('FCM_SERVER_KEY') ?: 'YOUR_LEGACY_SERVER_KEY'; 

    $fields = [
        'to' => $token,
        'data' => $data,
        'content_available' => true, // Required for iOS to wake up in background
        'priority' => 'high'         // Sometimes required to wake up Android
    ];

    $headers = [
        'Authorization: key=' . $serverKey,
        'Content-Type: application/json'
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
    
    $result = curl_exec($ch);
    curl_close($ch);
    
    return $result;
}
?>