/*
    * 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.metapath;
  
  import gov.nist.secauto.metaschema.core.metapath.function.FunctionUtils;
  import gov.nist.secauto.metaschema.core.metapath.function.OperationFunctions;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IAnyAtomicItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDateItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDateTimeItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDayTimeDurationItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.INumericItem;
  import gov.nist.secauto.metaschema.core.metapath.item.atomic.IYearMonthDurationItem;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  
  class Subtraction
      extends AbstractBasicArithmeticExpression {
  
    /**
     * An expression that gets the difference of two atomic data items.
     *
     * @param minuend
     *          an expression whose result is the value being subtracted from
     * @param subtrahend
     *          an expression whose result is the value being subtracted
     */
    protected Subtraction(@NonNull IExpression minuend, @NonNull IExpression subtrahend) {
      super(minuend, subtrahend);
    }
  
    @Override
    public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
      return visitor.visitSubtraction(this, context);
    }
  
    /**
     * Get the difference of two atomic items.
     *
     * @param minuend
     *          the item being subtracted from
     * @param subtrahend
     *          the item being subtracted
     * @return the difference of the items or an empty {@link ISequence} if either
     *         item is {@code null}
     */
    @Override
    @NonNull
    protected IAnyAtomicItem operation(@NonNull IAnyAtomicItem minuend, @NonNull IAnyAtomicItem subtrahend) {
      return subtract(minuend, subtrahend);
    }
  
    /**
     * Get the difference of two atomic items.
     *
     * @param minuend
     *          the item being subtracted from
     * @param subtrahend
     *          the item being subtracted
     * @return the difference of the items
     */
    @NonNull
    public static IAnyAtomicItem subtract(@NonNull IAnyAtomicItem minuend, // NOPMD - intentional
        @NonNull IAnyAtomicItem subtrahend) {
  
      IAnyAtomicItem retval = null;
      if (minuend instanceof IDateItem) {
        IDateItem left = (IDateItem) minuend;
  
        if (subtrahend instanceof IDateItem) {
          retval = OperationFunctions.opSubtractDates(left, (IDateItem) subtrahend);
        } else if (subtrahend instanceof IYearMonthDurationItem) {
          retval = OperationFunctions.opSubtractYearMonthDurationFromDate(left, (IYearMonthDurationItem) subtrahend);
        } else if (subtrahend instanceof IDayTimeDurationItem) {
          retval = OperationFunctions.opSubtractDayTimeDurationFromDate(left, (IDayTimeDurationItem) subtrahend);
        }
     } else if (minuend instanceof IDateTimeItem) {
       IDateTimeItem left = (IDateTimeItem) minuend;
       if (subtrahend instanceof IDateTimeItem) {
         retval = OperationFunctions.opSubtractDateTimes(left, (IDateTimeItem) subtrahend);
       } else if (subtrahend instanceof IYearMonthDurationItem) {
         retval = OperationFunctions.opSubtractYearMonthDurationFromDateTime(left, (IYearMonthDurationItem) subtrahend);
       } else if (subtrahend instanceof IDayTimeDurationItem) {
         retval = OperationFunctions.opSubtractDayTimeDurationFromDateTime(left, (IDayTimeDurationItem) subtrahend);
       }
     } else if (minuend instanceof IYearMonthDurationItem) {
       IYearMonthDurationItem left = (IYearMonthDurationItem) minuend;
       if (subtrahend instanceof IYearMonthDurationItem) {
         retval = OperationFunctions.opSubtractYearMonthDurations(left, (IYearMonthDurationItem) subtrahend);
       }
     } else if (minuend instanceof IDayTimeDurationItem) {
       IDayTimeDurationItem left = (IDayTimeDurationItem) minuend;
       if (subtrahend instanceof IDayTimeDurationItem) {
         retval = OperationFunctions.opSubtractDayTimeDurations(left, (IDayTimeDurationItem) subtrahend);
       }
     } else {
       // handle as numeric
       INumericItem left = FunctionUtils.toNumeric(minuend);
       INumericItem right = FunctionUtils.toNumeric(subtrahend);
       retval = OperationFunctions.opNumericSubtract(left, right);
     }
     if (retval == null) {
       throw new InvalidTypeMetapathException(
           null,
           String.format("The expression '%s - %s' is not supported", minuend.getClass().getName(),
               subtrahend.getClass().getName()));
     }
     return retval;
   }
 }