content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.asterix.runtime.evaluators.functions.temporal;
  
  import java.io.DataOutput;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.dataflow.data.nontagged.serde.ADateSerializerDeserializer;
  import org.apache.asterix.dataflow.data.nontagged.serde.ADurationSerializerDeserializer;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.ADuration;
  import org.apache.asterix.om.base.AMutableDuration;
  import org.apache.asterix.om.base.temporal.DurationArithmeticOperations;
  import org.apache.asterix.om.base.temporal.GregorianCalendarSystem;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  @MissingNullInOutFunction
  public class CalendarDurationFromDateDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private final static long serialVersionUID = 1L;
      public final static FunctionIdentifier FID = BuiltinFunctions.CALENDAR_DURATION_FROM_DATE;
      public final static IFunctionDescriptorFactory FACTORY = CalendarDurationFromDateDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
  
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
  
                  return new IScalarEvaluator() {
  
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private DataOutput out = resultStorage.getDataOutput();
                      private IPointable argPtr0 = new VoidPointable();
                      private IPointable argPtr1 = new VoidPointable();
                      private IScalarEvaluator eval0 = args[0].createScalarEvaluator(ctx);
                      private IScalarEvaluator eval1 = args[1].createScalarEvaluator(ctx);
  
                      @SuppressWarnings("unchecked")
                      private ISerializerDeserializer<ADuration> durationSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ADURATION);
  
                      private AMutableDuration aDuration = new AMutableDuration(0, 0);
  
                      private GregorianCalendarSystem calInstanct = GregorianCalendarSystem.getInstance();
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          eval0.evaluate(tuple, argPtr0);
                          eval1.evaluate(tuple, argPtr1);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, argPtr0, argPtr1)) {
                              return;
                          }
  
                          byte[] bytes0 = argPtr0.getByteArray();
                          int offset0 = argPtr0.getStartOffset();
                          byte[] bytes1 = argPtr1.getByteArray();
                          int offset1 = argPtr1.getStartOffset();
  
                          if (bytes0[offset0] != ATypeTag.SERIALIZED_DATE_TYPE_TAG) {
                              throw new TypeMismatchException(sourceLoc, getIdentifier(), 0, bytes0[offset0],
                                      ATypeTag.SERIALIZED_DATE_TYPE_TAG);
                          }
  
                          if (bytes1[offset1] != ATypeTag.SERIALIZED_DURATION_TYPE_TAG) {
                              throw new TypeMismatchException(sourceLoc, getIdentifier(), 1, bytes1[offset1],
                                      ATypeTag.SERIALIZED_DURATION_TYPE_TAG);
                          }
  
                          int yearMonthDurationInMonths =
                                  ADurationSerializerDeserializer.getYearMonth(bytes1, offset1 + 1);
                          long dayTimeDurationInMs = ADurationSerializerDeserializer.getDayTime(bytes1, offset1 + 1);
  
                          long startingTimePoint = ADateSerializerDeserializer.getChronon(bytes0, offset0 + 1)
                                  * GregorianCalendarSystem.CHRONON_OF_DAY;
  
                          long endingTimePoint = DurationArithmeticOperations.addDuration(startingTimePoint,
                                  yearMonthDurationInMonths, dayTimeDurationInMs, false);
  
                          if (startingTimePoint == endingTimePoint) {
                              aDuration.setValue(0, 0);
                          } else {
  
                              boolean negative = false;
  
                              if (endingTimePoint < startingTimePoint) {
                                  negative = true;
                                  // swap the starting and ending time, so that ending time is always larger than the
                                  // starting time.
                                  long tmpTime = endingTimePoint;
                                  endingTimePoint = startingTimePoint;
                                  startingTimePoint = tmpTime;
                              }
  
                              int year0 = calInstanct.getYear(startingTimePoint);
                              int month0 = calInstanct.getMonthOfYear(startingTimePoint, year0);
  
                              int year1 = calInstanct.getYear(endingTimePoint);
                              int month1 = calInstanct.getMonthOfYear(endingTimePoint, year1);
  
                              int year = year1 - year0;
                              int month = month1 - month0;
                              int day = calInstanct.getDayOfMonthYear(endingTimePoint, year1, month1)
                                      - calInstanct.getDayOfMonthYear(startingTimePoint, year0, month0);
                              int hour = calInstanct.getHourOfDay(endingTimePoint)
                                      - calInstanct.getHourOfDay(startingTimePoint);
                              int min = calInstanct.getMinOfHour(endingTimePoint)
                                      - calInstanct.getMinOfHour(startingTimePoint);
                              int sec = calInstanct.getSecOfMin(endingTimePoint)
                                      - calInstanct.getSecOfMin(startingTimePoint);
                              int ms = calInstanct.getMillisOfSec(endingTimePoint)
                                      - calInstanct.getMillisOfSec(startingTimePoint);
  
                              if (ms < 0) {
                                  ms += GregorianCalendarSystem.CHRONON_OF_SECOND;
                                  sec -= 1;
                              }
  
                              if (sec < 0) {
                                  sec += GregorianCalendarSystem.CHRONON_OF_MINUTE
                                          / GregorianCalendarSystem.CHRONON_OF_SECOND;
                                  min -= 1;
                              }
  
                              if (min < 0) {
                                  min += GregorianCalendarSystem.CHRONON_OF_HOUR
                                          / GregorianCalendarSystem.CHRONON_OF_MINUTE;
                                  hour -= 1;
                              }
  
                              if (hour < 0) {
                                  hour += GregorianCalendarSystem.CHRONON_OF_DAY
                                          / GregorianCalendarSystem.CHRONON_OF_HOUR;
                                  day -= 1;
                              }
  
                              if (day < 0) {
                                  boolean isLeapYear = calInstanct.isLeapYear(year1);
                                  // need to "borrow" the days in previous month to make the day positive; when month is
                                  // 1 (Jan), Dec will be borrowed
                                  day += isLeapYear ? (GregorianCalendarSystem.DAYS_OF_MONTH_LEAP[(12 + month1 - 2) % 12])
                                          : (GregorianCalendarSystem.DAYS_OF_MONTH_ORDI[(12 + month1 - 2) % 12]);
                                  month -= 1;
                              }
  
                              if (month < 0) {
                                  month += GregorianCalendarSystem.MONTHS_IN_A_YEAR;
                                  year -= 1;
                              }
  
                              if (negative) {
                                  aDuration.setValue(-1 * (year * GregorianCalendarSystem.MONTHS_IN_A_YEAR + month),
                                          -1 * (day * GregorianCalendarSystem.CHRONON_OF_DAY
                                                  + hour * GregorianCalendarSystem.CHRONON_OF_HOUR
                                                  + min * GregorianCalendarSystem.CHRONON_OF_MINUTE
                                                  + sec * GregorianCalendarSystem.CHRONON_OF_SECOND + ms));
                              } else {
                                  aDuration.setValue(year * GregorianCalendarSystem.MONTHS_IN_A_YEAR + month,
                                          day * GregorianCalendarSystem.CHRONON_OF_DAY
                                                  + hour * GregorianCalendarSystem.CHRONON_OF_HOUR
                                                  + min * GregorianCalendarSystem.CHRONON_OF_MINUTE
                                                  + sec * GregorianCalendarSystem.CHRONON_OF_SECOND + ms);
                              }
                          }
  
                          durationSerde.serialize(aDuration, out);
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  
      /* (non-Javadoc)
       * @see org.apache.asterix.om.functions.IFunctionDescriptor#getIdentifier()
       */
      @Override
      public FunctionIdentifier getIdentifier() {
          return FID;
      }
  
  }
  