import 'dart:ffi';

import 'package:ffi/ffi.dart';

// Windows API'lerini kullanacak olan kernel32 kütüphanesini açıyoruz
final kernel32 = DynamicLibrary.open('kernel32.dll');

// GetVolumeInformationW fonksiyonunu yükleyelim
final getVolumeInformation = kernel32.lookupFunction<Int32 Function(Pointer<Utf16> lpRootPathName, Pointer<Utf16> lpVolumeNameBuffer, Uint32 nVolumeNameSize, Pointer<Uint32> lpVolumeSerialNumber, Pointer<Uint32> lpMaximumComponentLength, Pointer<Uint32> lpFileSystemFlags, Pointer<Utf16> lpFileSystemNameBuffer, Uint32 nFileSystemNameSize),
    int Function(Pointer<Utf16> lpRootPathName, Pointer<Utf16> lpVolumeNameBuffer, int nVolumeNameSize, Pointer<Uint32> lpVolumeSerialNumber, Pointer<Uint32> lpMaximumComponentLength, Pointer<Uint32> lpFileSystemFlags, Pointer<Utf16> lpFileSystemNameBuffer, int nFileSystemNameSize)>('GetVolumeInformationW');

// İlk sürücüyü bulma fonksiyonu
String getFirstDriveLetter() {
  final drivesBitMask = getLogicalDrives();
  for (int i = 0; i < 26; i++) {
    if ((drivesBitMask & (1 << i)) != 0) {
      return '${String.fromCharCode(65 + i)}:\\';
    }
  }
  throw Exception('No logical drives found.');
}

// GetLogicalDrives fonksiyonunu yükleyelim
final getLogicalDrives = kernel32.lookupFunction<Uint32 Function(), int Function()>('GetLogicalDrives');

// Cihaz ID'sini almak için fonksiyon
String getDeviceId() {
  final drivePath = getFirstDriveLetter().toNativeUtf16();
  final volumeName = calloc<Utf16>(256); // Pointer<Utf16> ayarlıyoruz
  final serialNumber = calloc<Uint32>();
  final maxComponentLength = calloc<Uint32>();
  final fileSystemFlags = calloc<Uint32>();
  final fileSystemName = calloc<Utf16>(256); // Pointer<Utf16> ayarlıyoruz

  try {
    final result = getVolumeInformation(
      drivePath,
      volumeName,
      256,
      serialNumber,
      maxComponentLength,
      fileSystemFlags,
      fileSystemName,
      256,
    );

    if (result != 0) {
      // Cihaz seri numarasını döndür
      return serialNumber.value.toRadixString(16).toUpperCase();
    } else {
      throw Exception('GetVolumeInformation failed.');
    }
  } finally {
    // Bellek temizliği
    calloc.free(drivePath);
    calloc.free(volumeName);
    calloc.free(serialNumber);
    calloc.free(maxComponentLength);
    calloc.free(fileSystemFlags);
    calloc.free(fileSystemName);
  }
}