/*
 * 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 edu.stanford.futuredata.macrobase.sql.tree;

import static com.google.common.base.MoreObjects.toStringHelper;

import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

public class TableSubquery extends QueryBody {

    private final Query query;

    public TableSubquery(Query query) {
        this(Optional.empty(), query);
    }

    public TableSubquery(NodeLocation location, Query query) {
        this(Optional.of(location), query);
    }

    private TableSubquery(Optional<NodeLocation> location, Query query) {
        super(location);
        this.query = query;
    }

    public Query getQuery() {
        return query;
    }

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

    @Override
    public Select getSelect() {
        return SELECT_ALL;
    }

    @Override
    public Optional<Expression> getWhere() {
        return Optional.empty();

    }

    @Override
    public Optional<OrderBy> getOrderBy() {
        return Optional.empty();
    }

    @Override
    public Optional<String> getLimit() {
        return Optional.empty();
    }

    @Override
    public Optional<ExportClause> getExportExpr() {
        return Optional.empty();
    }

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

    @Override
    public String toString() {
        return toStringHelper(this)
            .addValue(query)
            .toString();
    }

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

        TableSubquery tableSubquery = (TableSubquery) o;
        return Objects.equals(query, tableSubquery.query);
    }

    @Override
    public int hashCode() {
        return query.hashCode();
    }
}
