content: /*
   * 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 com.datastax.dse.driver.internal.core.type.codec.time;
  
  import com.datastax.dse.driver.api.core.data.time.DateRange;
  import com.datastax.dse.driver.api.core.data.time.DateRangeBound;
  import com.datastax.dse.driver.api.core.data.time.DateRangePrecision;
  import com.datastax.dse.driver.api.core.type.DseDataTypes;
  import com.datastax.oss.driver.api.core.ProtocolVersion;
  import com.datastax.oss.driver.api.core.type.DataType;
  import com.datastax.oss.driver.api.core.type.codec.TypeCodec;
  import com.datastax.oss.driver.api.core.type.reflect.GenericType;
  import com.datastax.oss.driver.internal.core.util.Strings;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.nio.ByteBuffer;
  import java.text.ParseException;
  import java.time.Instant;
  import java.time.ZoneOffset;
  import java.time.ZonedDateTime;
  import java.util.Optional;
  
  public class DateRangeCodec implements TypeCodec<DateRange> {
  
    private static final GenericType<DateRange> JAVA_TYPE = GenericType.of(DateRange.class);
    private static final DataType CQL_TYPE = DseDataTypes.DATE_RANGE;
  
    // e.g. [2001-01-01]
    private static final byte DATE_RANGE_TYPE_SINGLE_DATE = 0x00;
    // e.g. [2001-01-01 TO 2001-01-31]
    private static final byte DATE_RANGE_TYPE_CLOSED_RANGE = 0x01;
    // e.g. [2001-01-01 TO *]
    private static final byte DATE_RANGE_TYPE_OPEN_RANGE_HIGH = 0x02;
    // e.g. [* TO 2001-01-01]
    private static final byte DATE_RANGE_TYPE_OPEN_RANGE_LOW = 0x03;
    // [* TO *]
    private static final byte DATE_RANGE_TYPE_BOTH_OPEN_RANGE = 0x04;
    // *
    private static final byte DATE_RANGE_TYPE_SINGLE_DATE_OPEN = 0x05;
  
    @NonNull
    @Override
    public GenericType<DateRange> getJavaType() {
      return JAVA_TYPE;
    }
  
    @NonNull
    @Override
    public DataType getCqlType() {
      return CQL_TYPE;
    }
  
    @Override
    public boolean accepts(@NonNull Class<?> javaClass) {
      return javaClass == DateRange.class;
    }
  
    @Nullable
    @Override
    public ByteBuffer encode(
        @Nullable DateRange dateRange, @NonNull ProtocolVersion protocolVersion) {
      if (dateRange == null) {
        return null;
      }
      byte rangeType = encodeType(dateRange);
      int bufferSize = 1;
      DateRangeBound lowerBound = dateRange.getLowerBound();
      Optional<DateRangeBound> maybeUpperBound = dateRange.getUpperBound();
      bufferSize += lowerBound.isUnbounded() ? 0 : 9;
      bufferSize += maybeUpperBound.map(upperBound -> upperBound.isUnbounded() ? 0 : 9).orElse(0);
      ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
      buffer.put(rangeType);
      if (!lowerBound.isUnbounded()) {
        put(buffer, lowerBound);
      }
      maybeUpperBound.ifPresent(
          upperBound -> {
            if (!upperBound.isUnbounded()) {
              put(buffer, upperBound);
            }
          });
      return (ByteBuffer) buffer.flip();
    }
  
    private static byte encodeType(DateRange dateRange) {
      if (dateRange.isSingleBounded()) {
        return dateRange.getLowerBound().isUnbounded()
            ? DATE_RANGE_TYPE_SINGLE_DATE_OPEN
            : DATE_RANGE_TYPE_SINGLE_DATE;
      } else {
        DateRangeBound upperBound =
            dateRange
                .getUpperBound()
                .orElseThrow(
                    () ->
                        new IllegalStateException("Upper bound should be set if !isSingleBounded()"));
        if (dateRange.getLowerBound().isUnbounded()) {
          return upperBound.isUnbounded()
              ? DATE_RANGE_TYPE_BOTH_OPEN_RANGE
              : DATE_RANGE_TYPE_OPEN_RANGE_LOW;
        } else {
          return upperBound.isUnbounded()
              ? DATE_RANGE_TYPE_OPEN_RANGE_HIGH
              : DATE_RANGE_TYPE_CLOSED_RANGE;
        }
      }
    }
  
    private static void put(ByteBuffer buffer, DateRangeBound bound) {
      buffer.putLong(bound.getTimestamp().toInstant().toEpochMilli());
      buffer.put(bound.getPrecision().getEncoding());
    }
  
    @Nullable
    @Override
    public DateRange decode(@Nullable ByteBuffer bytes, @NonNull ProtocolVersion protocolVersion) {
      if (bytes == null || bytes.remaining() == 0) {
        return null;
      }
      byte type = bytes.get();
      switch (type) {
        case DATE_RANGE_TYPE_SINGLE_DATE:
          return new DateRange(decodeLowerBound(bytes));
        case DATE_RANGE_TYPE_CLOSED_RANGE:
          return new DateRange(decodeLowerBound(bytes), decodeUpperBound(bytes));
        case DATE_RANGE_TYPE_OPEN_RANGE_HIGH:
          return new DateRange(decodeLowerBound(bytes), DateRangeBound.UNBOUNDED);
        case DATE_RANGE_TYPE_OPEN_RANGE_LOW:
          return new DateRange(DateRangeBound.UNBOUNDED, decodeUpperBound(bytes));
        case DATE_RANGE_TYPE_BOTH_OPEN_RANGE:
          return new DateRange(DateRangeBound.UNBOUNDED, DateRangeBound.UNBOUNDED);
        case DATE_RANGE_TYPE_SINGLE_DATE_OPEN:
          return new DateRange(DateRangeBound.UNBOUNDED);
        default:
          throw new IllegalArgumentException("Unknown date range type: " + type);
      }
    }
  
    private static DateRangeBound decodeLowerBound(ByteBuffer bytes) {
      long epochMilli = bytes.getLong();
      ZonedDateTime timestamp =
          ZonedDateTime.ofInstant(Instant.ofEpochMilli(epochMilli), ZoneOffset.UTC);
      DateRangePrecision precision = DateRangePrecision.fromEncoding(bytes.get());
      return DateRangeBound.lowerBound(timestamp, precision);
    }
  
    private static DateRangeBound decodeUpperBound(ByteBuffer bytes) {
      long epochMilli = bytes.getLong();
      ZonedDateTime timestamp =
          ZonedDateTime.ofInstant(Instant.ofEpochMilli(epochMilli), ZoneOffset.UTC);
      DateRangePrecision precision = DateRangePrecision.fromEncoding(bytes.get());
      return DateRangeBound.upperBound(timestamp, precision);
    }
  
    @NonNull
    @Override
    public String format(@Nullable DateRange dateRange) {
      return (dateRange == null) ? "NULL" : Strings.quote(dateRange.toString());
    }
  
    @Nullable
    @Override
    public DateRange parse(@Nullable String value) {
      if (value == null || value.isEmpty() || value.equalsIgnoreCase("NULL")) {
        return null;
      }
      try {
        return DateRange.parse(Strings.unquote(value));
      } catch (ParseException e) {
        throw new IllegalArgumentException(String.format("Invalid date range literal: %s", value), e);
      }
    }
  }
  