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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.hive.common.util;

import java.math.BigDecimal;
import java.text.SimpleDateFormat;

import org.apache.hadoop.hive.common.type.HiveIntervalDayTime;

/**
 * DateUtils. Thread-safe class
 *
 */
public class DateUtils {

  private static final ThreadLocal dateFormatLocal = new ThreadLocal() {
    @Override
    protected SimpleDateFormat initialValue() {
      return new SimpleDateFormat("yyyy-MM-dd");
    }
  };

  public static SimpleDateFormat getDateFormat() {
    return dateFormatLocal.get();
  }

  public static final int NANOS_PER_SEC = 1000000000;
  public static final BigDecimal MAX_INT_BD = new BigDecimal(Integer.MAX_VALUE);
  public static final BigDecimal NANOS_PER_SEC_BD = new BigDecimal(NANOS_PER_SEC);

  public static int parseNumericValueWithRange(String fieldName,
      String strVal, int minValue, int maxValue) throws IllegalArgumentException {
    int result = 0;
    if (strVal != null) {
      result = Integer.parseInt(strVal);
      if (result < minValue || result > maxValue) {
        throw new IllegalArgumentException(String.format("%s value %d outside range [%d, %d]",
            fieldName, result, minValue, maxValue));
      }
    }
    return result;
  }

  public static long getIntervalDayTimeTotalNanos(HiveIntervalDayTime intervalDayTime) {
    return intervalDayTime.getTotalSeconds() * NANOS_PER_SEC + intervalDayTime.getNanos();
  }

  public static void setIntervalDayTimeTotalNanos(HiveIntervalDayTime intervalDayTime,
      long totalNanos) {
    intervalDayTime.set(totalNanos / NANOS_PER_SEC, (int) (totalNanos % NANOS_PER_SEC));
  }

  public static long getIntervalDayTimeTotalSecondsFromTotalNanos(long totalNanos) {
    return totalNanos / NANOS_PER_SEC;
  }

  public static int getIntervalDayTimeNanosFromTotalNanos(long totalNanos) {
    return (int) (totalNanos % NANOS_PER_SEC);
  }
}