/*
 * 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.db.queryengine.plan.relational.sql.ast;

import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;

public class TableFunctionArgument extends Node {
  private final Optional<Identifier> name;
  private final Node value;

  public TableFunctionArgument(NodeLocation location, Optional<Identifier> name, Node value) {
    super(location);
    this.name = requireNonNull(name, "name is null");
    requireNonNull(value, "value is null");
    checkArgument(value instanceof TableFunctionTableArgument || value instanceof Expression);
    this.value = value;
  }

  public Optional<Identifier> getName() {
    return name;
  }

  public Node getValue() {
    return value;
  }

  @Override
  public <R, C> R accept(AstVisitor<R, C> visitor, C context) {
    return visitor.visitTableFunctionArgument(this, context);
  }

  @Override
  public List<? extends Node> getChildren() {
    return ImmutableList.of(value);
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    TableFunctionArgument other = (TableFunctionArgument) o;
    return Objects.equals(name, other.name) && Objects.equals(value, other.value);
  }

  @Override
  public int hashCode() {
    return Objects.hash(name, value);
  }

  @Override
  public String toString() {
    return name.map(identifier -> identifier + " => ").orElse("") + value;
  }

  @Override
  public boolean shallowEquals(Node o) {
    if (!sameClass(this, o)) {
      return false;
    }

    return Objects.equals(name, ((TableFunctionArgument) o).name);
  }
}
