/*
 * 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.iotdb.commons.utils;

import org.apache.iotdb.commons.conf.CommonDescriptor;

public class CommonDateTimeUtils {

  public CommonDateTimeUtils() {
    // Empty constructor
  }

  public static long convertMilliTimeWithPrecision(long milliTime, String timePrecision) {
    long result = milliTime;
    switch (timePrecision) {
      case "ns":
        result = milliTime * 1000_000L;
        break;
      case "us":
        result = milliTime * 1000L;
        break;
      default:
        break;
    }
    return result;
  }

  public static long currentTime() {
    long startupNano = CommonDescriptor.getInstance().getConfig().getStartUpNanosecond();
    String timePrecision = CommonDescriptor.getInstance().getConfig().getTimestampPrecision();
    switch (timePrecision) {
      case "ns":
        return System.currentTimeMillis() * 1000_000 + (System.nanoTime() - startupNano) % 1000_000;
      case "us":
        return System.currentTimeMillis() * 1000 + (System.nanoTime() - startupNano) / 1000 % 1000;
      default:
        return System.currentTimeMillis();
    }
  }
}
