/*
 * 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.tsfile.read.expression.impl;

import org.apache.iotdb.tsfile.read.expression.ExpressionType;
import org.apache.iotdb.tsfile.read.expression.IBinaryExpression;
import org.apache.iotdb.tsfile.read.expression.IExpression;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.Serializable;
import java.nio.ByteBuffer;
import java.util.Objects;

public abstract class BinaryExpression implements IBinaryExpression, Serializable {

  private static final long serialVersionUID = -711801318534904452L;

  public static AndExpression and(IExpression left, IExpression right) {
    return new AndExpression(left, right);
  }

  public static OrExpression or(IExpression left, IExpression right) {
    return new OrExpression(left, right);
  }

  @Override
  public abstract IExpression clone();

  protected static class AndExpression extends BinaryExpression {

    private IExpression left;
    private IExpression right;

    public AndExpression(IExpression left, IExpression right) {
      this.left = left;
      this.right = right;
    }

    @Override
    public IExpression getLeft() {
      return left;
    }

    @Override
    public IExpression getRight() {
      return right;
    }

    @Override
    public void setLeft(IExpression leftExpression) {
      this.left = leftExpression;
    }

    @Override
    public void setRight(IExpression rightExpression) {
      this.right = rightExpression;
    }

    @Override
    public ExpressionType getType() {
      return ExpressionType.AND;
    }

    @Override
    public IExpression clone() {
      return new AndExpression(left.clone(), right.clone());
    }

    @Override
    public void serialize(ByteBuffer byteBuffer) {
      ReadWriteIOUtils.write((byte) getType().ordinal(), byteBuffer);
      left.serialize(byteBuffer);
      right.serialize(byteBuffer);
    }

    @Override
    public String toString() {
      return "[" + left + " && " + right + "]";
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }

      if (o == null || getClass() != o.getClass()) {
        return false;
      }

      AndExpression that = (AndExpression) o;
      return Objects.equals(toString(), that.toString());
    }

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

  protected static class OrExpression extends BinaryExpression {

    private IExpression left;
    private IExpression right;

    public OrExpression(IExpression left, IExpression right) {
      this.left = left;
      this.right = right;
    }

    @Override
    public IExpression getLeft() {
      return left;
    }

    @Override
    public IExpression getRight() {
      return right;
    }

    @Override
    public void setLeft(IExpression leftExpression) {
      this.left = leftExpression;
    }

    @Override
    public void setRight(IExpression rightExpression) {
      this.right = rightExpression;
    }

    @Override
    public ExpressionType getType() {
      return ExpressionType.OR;
    }

    @Override
    public IExpression clone() {
      return new OrExpression(left.clone(), right.clone());
    }

    @Override
    public void serialize(ByteBuffer byteBuffer) {
      ReadWriteIOUtils.write((byte) getType().ordinal(), byteBuffer);
      left.serialize(byteBuffer);
      right.serialize(byteBuffer);
    }

    @Override
    public String toString() {
      return "[" + left + " || " + right + "]";
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }

      if (o == null || getClass() != o.getClass()) {
        return false;
      }

      OrExpression that = (OrExpression) o;
      return Objects.equals(toString(), that.toString());
    }

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