<?php
// ============================================================
// ride/location/save_driver_destination.php
// API Endpoint for Captains to set their destination (max 2 times daily)
// ============================================================

require_once __DIR__ . '/../../connect.php';

// 1. Authorize Driver
if ($role !== 'driver') {
    http_response_code(403);
    echo json_encode(['status' => 'failure', 'message' => 'Unauthorized. Driver role required.']);
    exit;
}

// 2. Filter Inputs
$action   = filterRequest('action') ?? 'set';
$destLat  = filterRequest('destination_lat') ?? filterRequest('target_latitude');
$destLng  = filterRequest('destination_lng') ?? filterRequest('target_longitude');
$destName = filterRequest('destination_name') ?? 'Destination';

function notifySocketServerDestination($userId, $hasDestination, $destLat = '', $destLng = '', $destName = '') {
    $url = getenv('LOCATION_SOCKET_URL');
    $internalKey = function_exists('getInternalSocketKey') ? getInternalSocketKey() : '';
    
    if (empty($url)) {
        error_log("[save_driver_destination] LOCATION_SOCKET_URL env variable not set");
        return;
    }

    $postData = [
        'action'           => 'update_driver_destination',
        'driver_id'        => (string)$userId,
        'has_destination'  => (int)$hasDestination,
        'destination_lat'  => (string)$destLat,
        'destination_lng'  => (string)$destLng,
        'destination_name' => (string)$destName,
    ];

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT_MS, 400); 
    if ($internalKey) {
        curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-internal-key: $internalKey"]);
    }
    curl_exec($ch);
    curl_close($ch);
}

try {
    if ($action === 'get') {
        $stmtGet = $con->prepare("
            SELECT target_latitude, target_longitude, destination_name, created_at 
            FROM driver_destinations 
            WHERE driver_id = :did 
            AND is_active = 1 
            LIMIT 1
        ");
        $stmtGet->execute([':did' => $user_id]);
        $activeDest = $stmtGet->fetch(PDO::FETCH_ASSOC);

        if ($activeDest) {
            jsonSuccess($activeDest, "Active destination retrieved.");
        } else {
            jsonSuccess(null, "No active destination set.");
        }
        exit;
    }

    if ($action === 'clear') {
        $stmtDeactivate = $con->prepare("
            UPDATE driver_destinations 
            SET is_active = 0 
            WHERE driver_id = :did 
            AND is_active = 1
        ");
        $stmtDeactivate->execute([':did' => $user_id]);
        
        // Sync with Redis on Socket Server
        notifySocketServerDestination($user_id, 0);

        jsonSuccess(null, "تم إلغاء تفعيل الوجهة الشخصية بنجاح.");
        exit;
    }

    // Default action: set
    if (empty($destLat) || empty($destLng)) {
        jsonError("Missing required parameters: destination_lat and destination_lng are required.");
    }

    // 3. Enforce Limit: Max 3 times daily
    // Check local Redis rate limit first
    if (isset($redis)) {
        $redisKey = "driver:dest_count:" . $user_id;
        $redisCount = intval($redis->get($redisKey));
        if ($redisCount >= 3) {
            jsonError("حسناً كابتن، لقد وصلت للحد الأقصى المسموح به لتحديد الوجهة اليوم (3 مرات في اليوم).");
        }
    }

    // Check MySQL database limit
    $stmtCount = $con->prepare("
        SELECT COUNT(*) 
        FROM driver_destinations 
        WHERE driver_id = :did 
        AND usage_date = CURDATE()
    ");
    $stmtCount->execute([':did' => $user_id]);
    $dailyCount = intval($stmtCount->fetchColumn());

    if ($dailyCount >= 3) {
        // Sync Redis counter just in case
        if (isset($redis)) {
            $redisKey = "driver:dest_count:" . $user_id;
            $redis->set($redisKey, $dailyCount);
            $redis->expire($redisKey, 86400); // 24 hours TTL
        }
        jsonError("حسناً كابتن، لقد وصلت للحد الأقصى المسموح به لتحديد الوجهة اليوم (3 مرات في اليوم).");
    }

    // 4. Deactivate previous active destinations for this driver
    $stmtDeactivate = $con->prepare("
        UPDATE driver_destinations 
        SET is_active = 0 
        WHERE driver_id = :did 
        AND is_active = 1
    ");
    $stmtDeactivate->execute([':did' => $user_id]);

    // 5. Insert new destination
    $stmtInsert = $con->prepare("
        INSERT INTO driver_destinations 
        (driver_id, target_latitude, target_longitude, destination_name, is_active, usage_date) 
        VALUES (:did, :lat, :lng, :name, 1, CURDATE())
    ");
    $stmtInsert->execute([
        ':did' => $user_id,
        ':lat' => (float)$destLat,
        ':lng' => (float)$destLng,
        ':name' => $destName
    ]);

    // Sync with Redis on Socket Server
    notifySocketServerDestination($user_id, 1, $destLat, $destLng, $destName);

    // Increment local Redis counter
    if (isset($redis)) {
        $redisKey = "driver:dest_count:" . $user_id;
        $redis->incr($redisKey);
        $redis->expire($redisKey, 86400); // 24 hours TTL
    }

    jsonSuccess(null, "تم حفظ وجهتك كابتن بنجاح! سيتم توجيه الطلبات المطابقة لوجهتك.");

} catch (Exception $e) {
    error_log("[save_driver_destination.php] Error: " . $e->getMessage());
    jsonError("Failed to save driver destination: " . $e->getMessage());
}