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/**
 * 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.hadoop.hive.metastore;

import java.math.BigDecimal;
import java.util.Map;

public class LinearExtrapolatePartStatus implements IExtrapolatePartStatus {

  @Override
  public Object extrapolate(Object[] min, Object[] max, int colStatIndex,
      Map indexMap) {
    int rightBorderInd = indexMap.size() - 1;
    int minInd = indexMap.get((String) min[1]);
    int maxInd = indexMap.get((String) max[1]);
    if (minInd == maxInd) {
      return min[0];
    }
    //note that recent metastore stores decimal in string.
    double decimalmin= 0;
    double decimalmax = 0;
    if (colStatTypes[colStatIndex] == ColStatType.Decimal) {
      BigDecimal bdmin = new BigDecimal(min[0].toString());
      decimalmin = bdmin.doubleValue();
      BigDecimal bdmax = new BigDecimal(max[0].toString());
      decimalmax = bdmax.doubleValue();
    }
    if (aggrTypes[colStatIndex] == AggrType.Max) {
      if (minInd < maxInd) {
        // right border is the max
        if (colStatTypes[colStatIndex] == ColStatType.Long) {
          return (Long) ((Long) min[0] + (((Long) max[0] - (Long) min[0])
              * (rightBorderInd - minInd) / (maxInd - minInd)));
        } else if (colStatTypes[colStatIndex] == ColStatType.Double) {
          return (Double) ((Double) min[0] + (((Double) max[0] - (Double) min[0])
              * (rightBorderInd - minInd) / (maxInd - minInd)));
        } else {
          double ret = decimalmin + (decimalmax - decimalmin)
              * (rightBorderInd - minInd) / (maxInd - minInd);
          return String.valueOf(ret);
        }
      } else {
        // left border is the max
        if (colStatTypes[colStatIndex] == ColStatType.Long) {
          return (Long) ((Long) min[0] + ((Long) max[0] - (Long) min[0])
              * minInd / (minInd - maxInd));
        } else if (colStatTypes[colStatIndex] == ColStatType.Double) {
          return (Double) ((Double) min[0] + ((Double) max[0] - (Double) min[0])
              * minInd / (minInd - maxInd));
        } else {
          double ret = decimalmin + (decimalmax - decimalmin) * minInd
              / (minInd - maxInd);
          return String.valueOf(ret);
        }
      }
    } else {
      if (minInd < maxInd) {
        // left border is the min
        if (colStatTypes[colStatIndex] == ColStatType.Long) {
          Long ret = (Long) max[0] - ((Long) max[0] - (Long) min[0]) * maxInd
              / (maxInd - minInd);
          return ret;
        } else if (colStatTypes[colStatIndex] == ColStatType.Double) {
          Double ret = (Double) max[0] - ((Double) max[0] - (Double) min[0])
              * maxInd / (maxInd - minInd);
          return ret;
        } else {
          double ret = decimalmax - (decimalmax - decimalmin) * maxInd
              / (maxInd - minInd);
          return String.valueOf(ret);
        }
      } else {
        // right border is the min
        if (colStatTypes[colStatIndex] == ColStatType.Long) {
          Long ret = (Long) max[0] - ((Long) max[0] - (Long) min[0])
              * (rightBorderInd - maxInd) / (minInd - maxInd);
          return ret;
        } else if (colStatTypes[colStatIndex] == ColStatType.Double) {
          Double ret = (Double) max[0] - ((Double) max[0] - (Double) min[0])
              * (rightBorderInd - maxInd) / (minInd - maxInd);
          return ret;
        } else {
          double ret = decimalmax - (decimalmax - decimalmin)
              * (rightBorderInd - maxInd) / (minInd - maxInd);
          return String.valueOf(ret);
        }
      }
    }
  }
}