/*
    * 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.core.JsonGenerator;
  import com.fasterxml.jackson.databind.jsonFormatVisitors.JsonFormatTypes;
  
  import gov.nist.secauto.metaschema.core.datatype.AbstractDataTypeAdapter;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IAnyAtomicItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IBooleanItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDecimalItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IIntegerItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.INumericItem;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  
  import java.io.IOException;
  import java.math.BigDecimal;
  import java.math.MathContext;
  import java.util.List;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  public class DecimalAdapter
      extends AbstractDataTypeAdapter<BigDecimal, IDecimalItem> {
    public static final MathContext MATH_CONTEXT = MathContext.DECIMAL64;
    @NonNull
    private static final BigDecimal DECIMAL_BOOLEAN_TRUE = new BigDecimal("1.0");
    @NonNull
    private static final BigDecimal DECIMAL_BOOLEAN_FALSE = new BigDecimal("0.0");
    @NonNull
    private static final List<String> NAMES = ObjectUtils.notNull(
        List.of("decimal"));
  
    DecimalAdapter() {
      super(BigDecimal.class);
    }
  
    @Override
    public List<String> getNames() {
      return NAMES;
    }
  
    @Override
    public JsonFormatTypes getJsonRawType() {
      return JsonFormatTypes.NUMBER;
    }
  
    @Override
    public BigDecimal parse(String value) {
      return new BigDecimal(value, MATH_CONTEXT);
    }
  
    @Override
    public void writeJsonValue(Object value, JsonGenerator generator) throws IOException {
      try {
        generator.writeNumber((BigDecimal) value);
      } catch (ClassCastException ex) {
        throw new IOException(ex);
      }
    }
  
    @Override
    public BigDecimal copy(Object obj) {
      // a BigDecimal is immutable
      return (BigDecimal) obj;
    }
  
    @Override
    public Class<IDecimalItem> getItemClass() {
      return IDecimalItem.class;
    }
  
    @Override
    public IDecimalItem newItem(Object value) {
      BigDecimal item = toValue(value);
     return IDecimalItem.valueOf(item);
   }
 
   @Override
   protected IDecimalItem castInternal(@NonNull IAnyAtomicItem item) {
     IDecimalItem retval;
     if (item instanceof INumericItem) {
       if (item instanceof IDecimalItem) {
         retval = (IDecimalItem) item;
       } else {
         // must be an integer type
         retval = newItem(((IIntegerItem) item).asDecimal());
       }
     } else if (item instanceof IBooleanItem) {
       boolean value = ((IBooleanItem) item).toBoolean();
       retval = newItem(value ? DECIMAL_BOOLEAN_TRUE : DECIMAL_BOOLEAN_FALSE);
     } else {
       retval = super.castInternal(item);
     }
     return retval;
   }
 }