/*
    * 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
    *
    *      https://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.commons.net.ntp;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.util.Calendar;
  import java.util.Date;
  import java.util.TimeZone;
  
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class that validates assertions for the basic TimeStamp operations and comparisons.
   */
  class TimeStampTest {
  
      private static final String TIME1 = "c1a9ae1c.cf6ac48d"; // Tue, Dec 17 2002 14:07:24.810 UTC
      private static final String TIME2 = "c1a9ae1c.cf6ac48f"; // Tue, Dec 17 2002 14:07:24.810 UTC
      private static final String TIME3 = "c1a9ae1d.cf6ac48e"; // Tue, Dec 17 2002 14:07:25.810 UTC
  
      @Test
      void testCompare() {
  
          final TimeStamp ts1 = new TimeStamp(TIME1); // Tue, Dec 17 2002 14:07:24.810 UTC
          final TimeStamp ts2 = new TimeStamp(TIME1);
          final TimeStamp ts3 = new TimeStamp(TIME2); // Tue, Dec 17 2002 14:07:24.810 UTC
          final TimeStamp ts4 = new TimeStamp(TIME3); // Tue, Dec 17 2002 14:07:25.810 UTC
  
          // do assertion tests on TimeStamp class
          assertEquals(ts1, ts2, "equals(1,2)");
          assertEquals(0, ts1.compareTo(ts2), "compareTo(1,2)");
          assertEquals(ts1.ntpValue(), ts2.ntpValue(), "ntpValue(1,2)");
          assertEquals(ts1.hashCode(), ts2.hashCode(), "hashCode(1,2)");
          assertEquals(ts1, ts1, "ts1==ts1");
  
          // timestamps in ts1 (TIME1) and ts3 (TIME2) are only off by the smallest
          // fraction of a second (~200 picoseconds) so the times are not equal but
          // when converted to Java dates (in milliseconds) they will be equal.
          assertFalse(ts1.equals(ts3), "ts1 != ts3");
          assertEquals(-1, ts1.compareTo(ts3), "compareTo(1,3)");
          assertEquals(ts1.getSeconds(), ts3.getSeconds(), "seconds");
          assertTrue(ts1.getFraction() != ts3.getFraction(), "fraction");
          assertTrue(ts1.ntpValue() != ts3.ntpValue(), "ntpValue(1,3)");
          assertTrue(ts1.hashCode() != ts3.hashCode(), "hashCode(1,3)");
          final long time1 = ts1.getTime();
          final long time3 = ts3.getTime();
          assertEquals(time1, time3, "equals(time1,3)"); // ntpTime1 != ntpTime3 but JavaTime(t1) == JavaTime(t3)...
  
          assertFalse(ts3.equals(ts4), "ts3 != ts4");
          assertTrue(time3 != ts4.getTime(), "time3 != ts4.time");
      }
  
      @Test
      void testDateConversion() {
          // convert current date to NtpTimeStamp then compare Java date
          // computed from NTP timestamp with original Java date.
          final Calendar refCal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
          final Date refDate = refCal.getTime();
          final TimeStamp ts = new TimeStamp(refDate);
          assertEquals(refDate.getTime(), ts.getTime(), "refDate.getTime()");
          final Date tsDate = ts.getDate();
          assertEquals(refDate, tsDate);
      }
  
      @Test
      void testNotSame() {
          final TimeStamp time = TimeStamp.getCurrentTime();
          Object other = Integer.valueOf(0);
          if (time.equals(other)) {
              fail("TimeStamp cannot equal Date");
          }
          other = null;
          if (time.equals(other)) {
              fail("TimeStamp cannot equal null");
          }
      }
  
      @Test
      void testUTCString() {
          final TimeStamp ts1 = new TimeStamp(TIME1); // Tue, Dec 17 2002 14:07:24.810 UTC
          final String actual = ts1.toUTCString();
         assertEquals("Tue, Dec 17 2002 14:07:24.810 UTC", actual);
     }
 
 }