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   *  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
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   *    https://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cayenne.crypto.transformer.value;
  
  import java.time.LocalDate;
  import java.time.LocalDateTime;
  import java.time.LocalTime;
  import java.util.Objects;
  
  import org.apache.cayenne.crypto.CayenneCryptoException;
  
  /**
   * @since 4.1
   */
  public class LocalDateTimeConverter implements BytesConverter<LocalDateTime> {
  
      public static final BytesConverter<LocalDateTime> INSTANCE = new LocalDateTimeConverter(LongConverter.INSTANCE);
  
      private BytesConverter<Long> longConverter;
  
      public LocalDateTimeConverter(BytesConverter<Long> longConverter) {
          this.longConverter = Objects.requireNonNull(longConverter);
      }
  
  
      @Override
      public LocalDateTime fromBytes(byte[] bytes) {
          if (bytes.length < 2) {
              throw new IllegalArgumentException("Unexpected number of bytes: " + bytes.length);
          }
  
          // long values converted to varying length byte arrays, so first byte is length
          int dateLength = bytes[0];
          if(dateLength <= 0 || dateLength >= bytes.length - 1) {
              throw new CayenneCryptoException("Corrupted data for LocalDateTime: wrong encoded length");
          }
          int timeLength = bytes.length - 1 - dateLength;
  
          byte[] date = new byte[dateLength];
          byte[] time = new byte[timeLength];
  
          System.arraycopy(bytes, 1, date, 0, dateLength);
          System.arraycopy(bytes, dateLength + 1, time, 0, timeLength);
  
          LocalDate localDate = LocalDate.ofEpochDay(longConverter.fromBytes(date));
          LocalTime localTime = LocalTime.ofNanoOfDay(longConverter.fromBytes(time));
          return LocalDateTime.of(localDate, localTime);
      }
  
  
      @Override
      public byte[] toBytes(LocalDateTime value) {
          byte[] date = longConverter.toBytes(value.toLocalDate().toEpochDay());
          byte[] time = longConverter.toBytes(value.toLocalTime().toNanoOfDay());
  
          byte [] datetime = new byte[date.length + time.length  + 1];
          // store date part length as first byte
          datetime[0] = (byte)date.length;
          System.arraycopy(date,0, datetime, 1, date.length);
          System.arraycopy(time,0, datetime, date.length + 1, time.length);
  
          return datetime;
      }
  }
  