/*
 * 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.phoenix.expression;

import java.math.BigDecimal;
import java.util.List;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.phoenix.exception.DataExceedsCapacityException;
import org.apache.phoenix.schema.SortOrder;
import org.apache.phoenix.schema.tuple.Tuple;
import org.apache.phoenix.schema.types.PDataType;
import org.apache.phoenix.schema.types.PDecimal;
import org.apache.phoenix.util.NumberUtil;

public class DecimalDivideExpression extends DivideExpression {

  public DecimalDivideExpression() {
  }

  public DecimalDivideExpression(List<Expression> children) {
    super(children);
  }

  @Override
  public boolean evaluate(Tuple tuple, ImmutableBytesWritable ptr) {
    BigDecimal result = null;
    for (int i = 0; i < children.size(); i++) {
      Expression childExpr = children.get(i);
      if (!childExpr.evaluate(tuple, ptr)) {
        return false;
      }
      if (ptr.getLength() == 0) {
        return true;
      }

      PDataType childType = childExpr.getDataType();
      SortOrder childSortOrder = childExpr.getSortOrder();
      BigDecimal bd = (BigDecimal) PDecimal.INSTANCE.toObject(ptr, childType, childSortOrder);

      if (result == null) {
        result = bd;
      } else {
        result = result.divide(bd, PDataType.DEFAULT_MATH_CONTEXT);
      }
    }
    if (getMaxLength() != null || getScale() != null) {
      result = NumberUtil.setDecimalWidthAndScale(result, getMaxLength(), getScale());
    }
    if (result == null) {
      throw new DataExceedsCapacityException(PDecimal.INSTANCE, getMaxLength(), getScale(), null);
    }
    ptr.set(PDecimal.INSTANCE.toBytes(result));
    return true;
  }

  @Override
  public PDataType getDataType() {
    return PDecimal.INSTANCE;
  }

  @Override
  public ArithmeticExpression clone(List<Expression> children) {
    return new DecimalDivideExpression(children);
  }
}
