<?php
// get.php (Main Server)

// 1. تضمين ملف الاتصال والدوال المساعدة (مهم جداً)
require_once __DIR__ . '/../../connect.php'; 

// ضبط التوقيت (للسجلات فقط، قاعدة البيانات تبقى UTC)
// date_default_timezone_set('Asia/Amman');

try {
    // ==========================================
    // 1. استقبال الإحداثيات (دعم الطريقتين)
    // ==========================================
    $lat = filterRequest("lat");
    $lng = filterRequest("lng");

    // دعم Bounds القديم (تحويله لمركز وقطر)
    if (!$lat || !$lng) {
        $swLat = filterRequest("southwestLat"); $neLat = filterRequest("northeastLat");
        $swLon = filterRequest("southwestLon"); $neLon = filterRequest("northeastLon");

        if ($swLat && $neLat && $swLon && $neLon) {
            $lat = ($swLat + $neLat) / 2;
            $lng = ($swLon + $neLon) / 2;
        } else {
            jsonError("Invalid coordinates provided");
            exit;
        }
    }

    // ==========================================
    // 2. طلب بيانات السائقين من سيرفر اللوكيشن (Redis API)
    //    — يرجع cache hits لو موجودة، وإلا يرجع IDs فقط
    // ==========================================
    $locationServerUrl = getenv('LOCATION_API_URL'); 
    $INTERNAL_KEY = trim(file_get_contents(getenv('INTERNAL_SOCKET_KEY_PATH'))); 

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $locationServerUrl);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
        'lat' => $lat, 
        'lng' => $lng, 
        'radius' => 5,
        'limit' => 50
    ]));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 3);
    curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-internal-key: $INTERNAL_KEY"]);

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    $redisDrivers = [];
    if ($httpCode == 200 && $response) {
        $json = json_decode($response, true);
        if (isset($json['status']) && $json['status'] === true) {
            $redisDrivers = $json['data'];
        }
    }

    if (empty($redisDrivers)) {
        jsonSuccess([]);
        exit;
    }

    // تقسيم: cache hits → نستخدمها فوراً، cache misses → نحتاج MySQL
    $final_result   = [];
    $mysqlIds       = [];
    $driversMap     = [];
    $serverNow      = date('Y-m-d H:i:s');

    foreach ($redisDrivers as $d) {
        if (!empty($d['cached']) && !empty($d['first_name'])) {
            // ✅ Cache hit — بيانات السائق كاملة من Redis, نستخدمها مباشرة
            $d['serverNow'] = $serverNow;
            $final_result[] = $d;
        } else {
            // ❌ Cache miss — نحتاج نجيب البيانات من MySQL
            $mysqlIds[] = $d['id'];
            $driversMap[$d['id']] = $d;
        }
    }

    // ==========================================
    // 3. فقط للسائقين اللي ما فيهم Cache: MySQL
    // ==========================================
    if (!empty($mysqlIds)) {
        $placeholders = implode(',', array_fill(0, count($mysqlIds), '?'));

        $sql_drivers_info = "
            SELECT 
                d.id AS driver_id,
                d.phone, d.email, d.birthdate, d.first_name, d.last_name, d.gender, d.maritalStatus,
                cr.make, cr.car_plate, cr.model, cr.color, cr.vin, cr.color_hex, cr.year, cr.vehicle_category_id,
                dt.token,
                COALESCE(rdAvg.ratingDriver, 0) AS ratingDriver
            FROM driver d
            LEFT JOIN CarRegistration cr ON cr.driverID = d.id
            LEFT JOIN driverToken dt ON dt.captain_id = d.id
            LEFT JOIN (
                SELECT driver_id, AVG(rating) AS ratingDriver FROM ratingDriver GROUP BY driver_id
            ) rdAvg ON rdAvg.driver_id = d.id
            WHERE d.id IN ($placeholders)
              AND COALESCE(cr.year, 0) > 2000
        ";

        $stmt = $con->prepare($sql_drivers_info);
        $stmt->execute($mysqlIds);
        $drivers_db = $stmt->fetchAll(PDO::FETCH_ASSOC);

        $fieldsToDecrypt = ['phone','email','gender','birthdate','first_name','last_name','token','car_plate','vin'];

        foreach ($drivers_db as $row) {
            $did = $row['driver_id'];

            if (isset($driversMap[$did])) {
                $redisInfo = $driversMap[$did];
                $row['latitude']  = $redisInfo['latitude'] ?? $redisInfo['lat'] ?? '';
                $row['longitude'] = $redisInfo['longitude'] ?? $redisInfo['lng'] ?? '';
                $row['heading']   = $redisInfo['heading'] ?? '0';
                $row['speed']     = $redisInfo['speed'] ?? '0';
            } else {
                continue;
            }

            $row['serverNow'] = $serverNow;

            foreach ($fieldsToDecrypt as $field) {
                if (isset($row[$field]) && $row[$field] !== null && $row[$field] !== '') {
                    try { 
                        $row[$field] = $encryptionHelper->decryptData($row[$field]); 
                    } catch (Exception $e) { 
                        $row[$field] = null; 
                    }
                }
            }

            if (!empty($row['birthdate'])) {
                try {
                    $birthdate  = new DateTime($row['birthdate']);
                    $today      = new DateTime();
                    $row['age'] = $today->diff($birthdate)->y;
                } catch (Exception $e) { $row['age'] = null; }
            } else {
                $row['age'] = null;
            }

            $final_result[] = $row;

            // 🆕 Fill driver:public cache for next time (async, fire-and-forget)
            sendToLocationServer('cache_driver_public', [
                'driver_id' => $did,
                'data'      => json_encode([
                    'first_name'  => $row['first_name'] ?? '',
                    'last_name'   => $row['last_name'] ?? '',
                    'gender'      => $row['gender'] ?? '',
                    'make'        => $row['make'] ?? '',
                    'model'       => $row['model'] ?? '',
                    'color'       => $row['color'] ?? '',
                    'color_hex'   => $row['color_hex'] ?? '',
                    'year'        => $row['year'] ?? '',
                    'car_plate'   => $row['car_plate'] ?? '',
                    'ratingDriver'=> $row['ratingDriver'] ?? '0',
                    'latitude'    => $row['latitude'] ?? '',
                    'longitude'   => $row['longitude'] ?? '',
                    'heading'     => $row['heading'] ?? '0',
                    'speed'       => $row['speed'] ?? '0',
                    'updated_at'  => time()
                ]),
            ]);
        }
    }

    // إرجاع النتيجة
    jsonSuccess($final_result);

} catch (PDOException $e) {
    error_log("[get.php] " . $e->getMessage());
    jsonError("An internal error occurred. Please try again later.");
} catch (Throwable $e) {
    error_log("[get.php] " . $e->getMessage());
    jsonError("An internal error occurred. Please try again later.");
}
?>