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/*
 * Licensed 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 io.trino.sql.tree;

import com.google.common.collect.ImmutableList;

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

import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;

public class MergeInsert
        extends MergeCase
{
    private final List columns;
    private final List values;

    public MergeInsert(Optional expression, List columns, List values)
    {
        this(Optional.empty(), expression, columns, values);
    }

    public MergeInsert(NodeLocation location, Optional expression, List columns, List values)
    {
        this(Optional.of(location), expression, columns, values);
    }

    public MergeInsert(Optional location, Optional expression, List columns, List values)
    {
        super(location, expression);
        this.columns = ImmutableList.copyOf(requireNonNull(columns, "columns is null"));
        this.values = ImmutableList.copyOf(requireNonNull(values, "values is null"));
    }

    public List getColumns()
    {
        return columns;
    }

    public List getValues()
    {
        return values;
    }

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

    @Override
    public List getSetColumns()
    {
        return columns;
    }

    @Override
    public List getSetExpressions()
    {
        return values;
    }

    @Override
    public List getChildren()
    {
        ImmutableList.Builder builder = ImmutableList.builder();
        expression.ifPresent(builder::add);
        builder.addAll(columns);
        builder.addAll(values);
        return builder.build();
    }

    @Override
    public int hashCode()
    {
        return Objects.hash(expression, columns, values);
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }
        MergeInsert o = (MergeInsert) obj;
        return Objects.equals(expression, o.expression) &&
                Objects.equals(columns, o.columns) &&
                Objects.equals(values, o.values);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("expression", expression.orElse(null))
                .add("columns", columns)
                .add("values", values)
                .omitNullValues()
                .toString();
    }
}