<?php
declare(strict_types=1);
require_once __DIR__ . '/../db/config.php';

$db = db();
// Active in the last 15 minutes, has username and phone
// Use GROUP BY to avoid duplicates if same session/user has multiple entries (though session_id should be unique-ish)
$stmt = $db->prepare("
    SELECT username, phone_number, country_code, last_activity 
    FROM visitor_logs 
    WHERE last_activity > DATE_SUB(NOW(), INTERVAL 15 MINUTE) 
    AND username IS NOT NULL 
    AND phone_number IS NOT NULL 
    AND username != ''
    AND phone_number != ''
    GROUP BY username, phone_number
    ORDER BY last_activity DESC
    LIMIT 20
");
$stmt->execute();
$users = $stmt->fetchAll();

echo json_encode(['success' => true, 'users' => $users]);