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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 java.util.stream.Collectors;

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;

public final class GroupingSets
        extends GroupingElement
{
    public enum Type
    {
        EXPLICIT,
        ROLLUP,
        CUBE
    }

    private final Type type;
    private final List> sets;

    public GroupingSets(Type type, List> groupingSets)
    {
        this(Optional.empty(), type, groupingSets);
    }

    public GroupingSets(NodeLocation location, Type type, List> sets)
    {
        this(Optional.of(location), type, sets);
    }

    private GroupingSets(Optional location, Type type, List> sets)
    {
        super(location);
        this.type = requireNonNull(type, "type is null");
        requireNonNull(sets, "sets is null");
        checkArgument(!sets.isEmpty(), "grouping sets cannot be empty");
        this.sets = sets.stream().map(ImmutableList::copyOf).collect(toImmutableList());
    }

    public Type getType()
    {
        return type;
    }

    public List> getSets()
    {
        return sets;
    }

    @Override
    public List getExpressions()
    {
        return sets.stream()
                .flatMap(List::stream)
                .collect(Collectors.toList());
    }

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

    @Override
    public List getChildren()
    {
        return ImmutableList.of();
    }

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

    @Override
    public int hashCode()
    {
        return Objects.hash(type, sets);
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("type", type)
                .add("sets", sets)
                .toString();
    }

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

        GroupingSets that = (GroupingSets) other;
        return Objects.equals(sets, that.sets) && Objects.equals(type, that.type);
    }
}