/*
 * Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.jet.sql.impl.opt.physical;

import com.hazelcast.jet.core.Vertex;
import com.hazelcast.sql.impl.expression.Expression;
import com.hazelcast.sql.impl.plan.node.PlanNodeSchema;
import com.hazelcast.sql.impl.type.QueryDataType;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rex.RexNode;

import java.util.List;

import static com.hazelcast.jet.impl.util.Util.toList;

public class ProjectPhysicalRel extends Project implements PhysicalRel {

    ProjectPhysicalRel(
            RelOptCluster cluster,
            RelTraitSet traits,
            RelNode input,
            List<? extends RexNode> projects,
            RelDataType rowType
    ) {
        super(cluster, traits, input, projects, rowType);
    }

    public List<Expression<?>> projection() {
        return project(((PhysicalRel) getInput()).schema(), getProjects());
    }

    @Override
    public PlanNodeSchema schema() {
        List<QueryDataType> fieldTypes = toList(projection(), Expression::getType);
        return new PlanNodeSchema(fieldTypes);
    }

    @Override
    public Vertex accept(CreateDagVisitor visitor) {
        return visitor.onProject(this);
    }

    @Override
    public final Project copy(RelTraitSet traitSet, RelNode input, List<RexNode> projects, RelDataType rowType) {
        return new ProjectPhysicalRel(getCluster(), traitSet, input, projects, rowType);
    }
}
