parseResponse method

@override VtjCommandResult<GetVersionResult> parseResponse(Uint8List response)

Parse the response bytes from the device.

Implementation

@override
VtjCommandResult<GetVersionResult> parseResponse(Uint8List response) {
  try {
    if (response.isEmpty) {
      return const VtjCommandResult.failure('Response is empty', null);
    }

    if (response.length < 2) {
      return const VtjCommandResult.failure('Response too short', null);
    }

    final callId = response[0];
    final statusCode = response[1];

    if (callId != commandId) {
      return VtjCommandResult.failure(
        'Invalid call ID in response: $callId',
        null,
      );
    }

    if (statusCode != 0) {
      return VtjCommandResult.failure(
        'Command failed with status: $statusCode',
        statusCode,
      );
    }

    // For successful response, we need the version string data
    // Expected response structure: [Call ID: 1 byte][Status: 1 byte][Version String: 1-30 bytes, null terminated]
    // Total minimum length: 1 + 1 + 1 = 3 bytes (at least one character + null terminator)
    if (response.length < 3) {
      return const VtjCommandResult.failure(
        'Insufficient data in response for version string',
        null,
      );
    }

    // Extract version string starting from index 2
    final versionBytes = response.sublist(2);

    // Find null terminator or use all bytes if no null terminator found
    int nullIndex = versionBytes.indexOf(0);
    final actualVersionBytes =
        nullIndex >= 0 ? versionBytes.sublist(0, nullIndex) : versionBytes;

    // Convert bytes to ASCII string
    final versionString = ascii.decode(actualVersionBytes);

    return VtjCommandResult.success(GetVersionResult(version: versionString));
  } catch (e) {
    return VtjCommandResult.failure('Failed to parse response: $e', null);
  }
}