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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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   *
   *     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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.cql3.functions;
  
  import java.nio.ByteBuffer;
  import java.time.*;
  import java.time.format.DateTimeFormatter;
  import java.util.Date;
  
  import org.junit.Test;
  
  import org.apache.cassandra.db.marshal.LongType;
  import org.apache.cassandra.db.marshal.SimpleDateType;
  import org.apache.cassandra.db.marshal.TimeUUIDType;
  import org.apache.cassandra.db.marshal.TimestampType;
  import org.apache.cassandra.transport.ProtocolVersion;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.cql3.functions.TimeFcts.*;
  import static org.apache.cassandra.utils.TimeUUID.Generator.atUnixMillisAsBytes;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  public class TimeFctsTest
  {
      private static final LocalDate LOCAL_DATE = LocalDate.of(2019, 8, 3);
  
      private static final ZonedDateTime DATE = LOCAL_DATE.atStartOfDay(ZoneOffset.UTC);
      private static final LocalTime LOCAL_TIME = LocalTime.of(11, 3, 2);
      private static final ZonedDateTime DATE_TIME =
              ZonedDateTime.of(LOCAL_DATE, LOCAL_TIME, ZoneOffset.UTC);
      private static final String DATE_STRING = DATE.format(DateTimeFormatter.ISO_LOCAL_DATE);
      private static final String DATE_TIME_STRING =
              DATE_STRING + " " + LOCAL_TIME.format(DateTimeFormatter.ISO_LOCAL_TIME);
  
      @Test
      public void testMinTimeUuid()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = TimestampType.instance.fromString(DATE_TIME_STRING + "+00");
          ByteBuffer output = executeFunction(TimeFcts.minTimeuuidFct, input);
          assertEquals(TimeUUID.minAtUnixMillis(timeInMillis), TimeUUIDType.instance.compose(output));
      }
  
      @Test
      public void testMinTimeUuidFromBigInt()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = LongType.instance.decompose(timeInMillis);
          ByteBuffer output = executeFunction(TimeFcts.minTimeuuidFct, input);
          assertEquals(TimeUUID.minAtUnixMillis(timeInMillis), TimeUUIDType.instance.compose(output));
      }
  
      @Test
      public void testMaxTimeUuid()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = TimestampType.instance.fromString(DATE_TIME_STRING + "+00");
          ByteBuffer output = executeFunction(TimeFcts.maxTimeuuidFct, input);
          assertEquals(TimeUUID.maxAtUnixMillis(timeInMillis), TimeUUIDType.instance.compose(output));
      }
  
      @Test
      public void testMaxTimeUuidFromBigInt()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = LongType.instance.decompose(timeInMillis);
          ByteBuffer output = executeFunction(TimeFcts.maxTimeuuidFct, input);
          assertEquals(TimeUUID.maxAtUnixMillis(timeInMillis), TimeUUIDType.instance.compose(output));
      }
  
      @Test
      public void testTimeUuidToTimestamp()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = ByteBuffer.wrap(atUnixMillisAsBytes(timeInMillis, 0));
          ByteBuffer output = executeFunction(toTimestamp(TimeUUIDType.instance), input);
          assertEquals(Date.from(DATE_TIME.toInstant()), TimestampType.instance.compose(output));
      }
  
      @Test
      public void testTimeUuidToUnixTimestamp()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = ByteBuffer.wrap(atUnixMillisAsBytes(timeInMillis, 0));
          ByteBuffer output = executeFunction(toUnixTimestamp(TimeUUIDType.instance), input);
          assertEquals(timeInMillis, LongType.instance.compose(output).longValue());
      }
  
      @Test
      public void testTimeUuidToDate()
      {
          long timeInMillis = DATE_TIME.toInstant().toEpochMilli();
          ByteBuffer input = ByteBuffer.wrap(atUnixMillisAsBytes(timeInMillis, 0));
          ByteBuffer output = executeFunction(toDate(TimeUUIDType.instance), input);
  
          long expectedTime = DATE.toInstant().toEpochMilli();
  
          assertEquals(expectedTime, SimpleDateType.instance.toTimeInMillis(output));
      }
  
      @Test
      public void testDateToTimestamp()
      {
          ByteBuffer input = SimpleDateType.instance.fromString(DATE_STRING);
          ByteBuffer output = executeFunction(toTimestamp(SimpleDateType.instance), input);
          assertEquals(Date.from(DATE.toInstant()), TimestampType.instance.compose(output));
      }
  
      @Test
      public void testDateToUnixTimestamp()
      {
          ByteBuffer input = SimpleDateType.instance.fromString(DATE_STRING);
          ByteBuffer output = executeFunction(toUnixTimestamp(SimpleDateType.instance), input);
          assertEquals(DATE.toInstant().toEpochMilli(), LongType.instance.compose(output).longValue());
      }
  
      @Test
      public void testTimestampToDate()
      {
          ByteBuffer input = TimestampType.instance.fromString(DATE_TIME_STRING + "+00");
          ByteBuffer output = executeFunction(toDate(TimestampType.instance), input);
          assertEquals(DATE.toInstant().toEpochMilli(), SimpleDateType.instance.toTimeInMillis(output));
      }
  
      @Test
      public void testBigIntegerToDate()
      {
          long millis = DATE.toInstant().toEpochMilli();
  
          ByteBuffer input = LongType.instance.decompose(millis);
          ByteBuffer output = executeFunction(toDate(TimestampType.instance), input);
          assertEquals(DATE.toInstant().toEpochMilli(), SimpleDateType.instance.toTimeInMillis(output));
      }
  
      @Test
      public void testTimestampToDateWithEmptyInput()
      {
          ByteBuffer output = executeFunction(toDate(TimestampType.instance), ByteBufferUtil.EMPTY_BYTE_BUFFER);
          assertNull(output);
      }
  
      @Test
      public void testTimestampToUnixTimestamp()
      {
          ByteBuffer input = TimestampType.instance.decompose(Date.from(DATE_TIME.toInstant()));
          ByteBuffer output = executeFunction(toUnixTimestamp(TimestampType.instance), input);
          assertEquals(DATE_TIME.toInstant().toEpochMilli(), LongType.instance.compose(output).longValue());
      }
  
      @Test
      public void testBigIntegerToTimestamp()
      {
          long millis = DATE_TIME.toInstant().toEpochMilli();
  
          ByteBuffer input = LongType.instance.decompose(millis);
          ByteBuffer output = executeFunction(toTimestamp(TimestampType.instance), input);
          assertEquals(DATE_TIME.toInstant().toEpochMilli(), LongType.instance.compose(output).longValue());
      }
  
      @Test
      public void testTimestampToUnixTimestampWithEmptyInput()
      {
          ByteBuffer output = executeFunction(TimeFcts.toUnixTimestamp(TimestampType.instance), ByteBufferUtil.EMPTY_BYTE_BUFFER);
          assertNull(output);
      }
  
      private static ByteBuffer executeFunction(Function function, ByteBuffer input)
      {
          Arguments arguments = function.newArguments(ProtocolVersion.CURRENT);
          arguments.set(0, input);
          return ((ScalarFunction) function).execute(arguments);
      }
  }
  