/*
 * 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.schema.filter.impl.values;

import org.apache.iotdb.commons.schema.filter.SchemaFilter;
import org.apache.iotdb.commons.schema.filter.SchemaFilterType;
import org.apache.iotdb.commons.schema.filter.SchemaFilterVisitor;

import org.apache.tsfile.common.regexp.LikePattern;
import org.apache.tsfile.utils.RamUsageEstimator;
import org.apache.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Objects;
import java.util.Optional;

public class LikeFilter extends SchemaFilter {
  private static final long INSTANCE_SIZE =
      RamUsageEstimator.shallowSizeOfInstance(LikeFilter.class);

  private final LikePattern pattern;

  public LikeFilter(final String regex, final Optional<Character> escape) {
    this.pattern = LikePattern.compile(regex, escape);
  }

  public LikeFilter(final ByteBuffer byteBuffer) {
    this.pattern =
        LikePattern.compile(
            ReadWriteIOUtils.readString(byteBuffer),
            ReadWriteIOUtils.readBool(byteBuffer)
                ? Optional.of(ReadWriteIOUtils.readString(byteBuffer).charAt(0))
                : Optional.empty());
  }

  public LikePattern getPattern() {
    return pattern;
  }

  @Override
  public <C> Boolean accept(final SchemaFilterVisitor<C> visitor, final C node) {
    return visitor.visitLikeFilter(this, node);
  }

  @Override
  public SchemaFilterType getSchemaFilterType() {
    return SchemaFilterType.LIKE;
  }

  @Override
  protected void serialize(final ByteBuffer byteBuffer) {
    ReadWriteIOUtils.write(pattern.getPattern(), byteBuffer);
    if (pattern.getEscape().isPresent()) {
      ReadWriteIOUtils.write(true, byteBuffer);
      ReadWriteIOUtils.write(pattern.getEscape().get().toString(), byteBuffer);
    } else {
      ReadWriteIOUtils.write(false, byteBuffer);
    }
  }

  @Override
  protected void serialize(final DataOutputStream stream) throws IOException {
    ReadWriteIOUtils.write(pattern.getPattern(), stream);
    if (pattern.getEscape().isPresent()) {
      ReadWriteIOUtils.write(true, stream);
      ReadWriteIOUtils.write(pattern.getEscape().get().toString(), stream);
    } else {
      ReadWriteIOUtils.write(false, stream);
    }
  }

  @Override
  public boolean equals(final Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    final LikeFilter that = (LikeFilter) o;
    return Objects.equals(pattern, that.pattern);
  }

  @Override
  public int hashCode() {
    return Objects.hash(pattern);
  }

  @Override
  public long ramBytesUsed() {
    long size = INSTANCE_SIZE;
    size += RamUsageEstimator.sizeOfObject(pattern);
    return size;
  }
}
