import 'dart:ffi';

import 'package:ffi/ffi.dart';

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

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

// 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');

// Tüm disklerin seri numaralarını tek bir string olarak almak
String getDeviceDiskId() {
  StringBuffer diskIds = StringBuffer(); // StringBuffer kullanıyoruz

  final drivesBitMask = getLogicalDrives();

  for (int i = 0; i < 26; i++) {
    if ((drivesBitMask & (1 << i)) != 0) {
      final driveLetter = '${String.fromCharCode(65 + i)}:\\';
      final drivePath = driveLetter.toNativeUtf16();
      final volumeName = calloc.allocate<Utf16>(256); // Pointer<Utf16> ayarlıyoruz
      final serialNumber = calloc<Uint32>();
      final maxComponentLength = calloc<Uint32>();
      final fileSystemFlags = calloc<Uint32>();
      final fileSystemName = calloc.allocate<Utf16>(256); // Pointer<Utf16> ayarlıyoruz

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

        if (result != 0) {
          // Seri numarasını StringBuffer'a ekle
          if (diskIds.isNotEmpty) {
            diskIds.write('-'); // Araya tire koyuyoruz
          }
          diskIds.write(serialNumber.value.toRadixString(16).toUpperCase());
        }
      } finally {
        // Bellek temizliği
        calloc.free(drivePath);
        calloc.free(volumeName);
        calloc.free(serialNumber);
        calloc.free(maxComponentLength);
        calloc.free(fileSystemFlags);
        calloc.free(fileSystemName);
      }
    }
  }

  if (diskIds.isEmpty) {
    throw Exception('No logical drives found.');
  }

  return diskIds.toString(); // StringBuffer'dan string olarak dönüyoruz
}