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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.impossibl.postgres.system.procs;

import java.time.ZoneId;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

import static java.util.concurrent.TimeUnit.SECONDS;


class DatesTimes {

  static final TimeZone UTC = TimeZone.getTimeZone("UTC");
  static final ZoneId UTC_ID = UTC.toZoneId();

  static final String POS_INFINITY = "infinity";
  static final String NEG_INFINITY = "-infinity";

  static final long JAVA_DATE_POSITIVE_INFINITY_MSECS = 9223372036825200000L;
  static final long JAVA_DATE_NEGATIVE_INFINITY_MSECS = -9223372036832400000L;

  private static final long PG_EPOCH_SECS = 946684800L;

  static long pgEpochToJava(long value, TimeUnit timeUnit) {

    return value + timeUnit.convert(PG_EPOCH_SECS, SECONDS);
  }

  static long javaEpochToPg(long value, TimeUnit timeUnit) {

    return value - timeUnit.convert(PG_EPOCH_SECS, SECONDS);
  }

}