/*
    * Portions of this software was developed by employees of the National Institute
    * of Standards and Technology (NIST), an agency of the Federal Government and is
    * being made available as a public service. Pursuant to title 17 United States
    * Code Section 105, works of NIST employees are not subject to copyright
    * protection in the United States. This software may be subject to foreign
    * copyright. Permission in the United States and in foreign countries, to the
    * extent that NIST may hold copyright, to use, copy, modify, create derivative
    * works, and distribute this software and its documentation without fee is hereby
   * granted on a non-exclusive basis, provided that this notice and disclaimer
   * of warranty appears in all copies.
   *
   * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
   * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
   * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
   * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
   * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE.  IN NO EVENT
   * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
   * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
   * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
   * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
   * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
   * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
   */
  
  package gov.nist.secauto.metaschema.core.datatype.adapter;
  
  import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
  
  import gov.nist.secauto.metaschema.core.datatype.AbstractDataTypeAdapter;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IBase64BinaryItem;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  
  import java.nio.ByteBuffer;
  import java.util.Base64;
  import java.util.List;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class Base64Adapter
      extends AbstractDataTypeAdapter<ByteBuffer, IBase64BinaryItem> {
    @NonNull
    private static final List<String> NAMES = ObjectUtils.notNull(
        List.of(
            "base64",
            // for backwards compatibility with original type name
            "base64Binary"));
  
    Base64Adapter() {
      super(ByteBuffer.class);
    }
  
    @Override
    public List<String> getNames() {
      return NAMES;
    }
  
    @Override
    public JsonFormatTypes getJsonRawType() {
      return JsonFormatTypes.STRING;
    }
  
    @SuppressWarnings("null")
    @Override
    public ByteBuffer parse(String value) {
      Base64.Decoder decoder = Base64.getDecoder();
      byte[] result = decoder.decode(value);
      return ByteBuffer.wrap(result);
    }
  
    @Override
    public ByteBuffer copy(Object obj) {
      ByteBuffer buffer = (ByteBuffer) obj;
      final ByteBuffer clone
          = buffer.isDirect() ? ByteBuffer.allocateDirect(buffer.capacity()) : ByteBuffer.allocate(buffer.capacity());
      final ByteBuffer readOnlyCopy = buffer.asReadOnlyBuffer();
      readOnlyCopy.flip();
      clone.put(readOnlyCopy);
      return clone;
    }
  
    @SuppressWarnings("null")
    @Override
    public String asString(Object value) {
      Base64.Encoder encoder = Base64.getEncoder();
      return encoder.encodeToString(((ByteBuffer) value).array());
    }
  
    @Override
    public Class<IBase64BinaryItem> getItemClass() {
      return IBase64BinaryItem.class;
    }
  
    @Override
    public IBase64BinaryItem newItem(Object value) {
      ByteBuffer item = toValue(value);
      return IBase64BinaryItem.valueOf(item);
    }
 
 }