/*
 * 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.hyracks.algebricks.core.algebra.operators.physical;

import java.util.ArrayList;
import java.util.List;

import org.apache.hyracks.algebricks.common.constraints.AlgebricksPartitionConstraint;
import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
import org.apache.hyracks.algebricks.common.utils.Pair;
import org.apache.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder;
import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
import org.apache.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
import org.apache.hyracks.algebricks.core.algebra.metadata.IDataSource;
import org.apache.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
import org.apache.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
import org.apache.hyracks.algebricks.core.algebra.operators.logical.WriteResultOperator;
import org.apache.hyracks.algebricks.core.algebra.properties.IPartitioningRequirementsCoordinator;
import org.apache.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector;
import org.apache.hyracks.algebricks.core.algebra.properties.PhysicalRequirements;
import org.apache.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector;
import org.apache.hyracks.algebricks.core.jobgen.impl.JobGenContext;
import org.apache.hyracks.api.dataflow.IOperatorDescriptor;
import org.apache.hyracks.api.job.JobSpecification;

public class WriteResultPOperator extends AbstractPhysicalOperator {

    private LogicalVariable payload;
    private List<LogicalVariable> keys;
    private IDataSource<?> dataSource;
    private final List<LogicalVariable> additionalFilteringKeys;

    public WriteResultPOperator(IDataSource<?> dataSource, LogicalVariable payload, List<LogicalVariable> keys,
            List<LogicalVariable> additionalFilteringKeys) {
        this.dataSource = dataSource;
        this.payload = payload;
        this.keys = keys;
        this.additionalFilteringKeys = additionalFilteringKeys;
    }

    @Override
    public String toString() {
        return getOperatorTag().toString() + " " + payload + " " + keys;
    }

    @Override
    public PhysicalOperatorTag getOperatorTag() {
        return PhysicalOperatorTag.WRITE_RESULT;
    }

    @Override
    public boolean isMicroOperator() {
        return true;
    }

    @Override
    public void computeDeliveredProperties(ILogicalOperator op, IOptimizationContext context) {
        AbstractLogicalOperator op2 = (AbstractLogicalOperator) op.getInputs().get(0).getValue();
        deliveredProperties = (StructuralPropertiesVector) op2.getDeliveredPhysicalProperties().clone();
    }

    @Override
    public PhysicalRequirements getRequiredPropertiesForChildren(ILogicalOperator op,
            IPhysicalPropertiesVector reqdByParent, IOptimizationContext context) {
        List<LogicalVariable> scanVariables = new ArrayList<LogicalVariable>();
        scanVariables.addAll(keys);
        scanVariables.add(new LogicalVariable(-1));
        IPhysicalPropertiesVector r = dataSource.getPropertiesProvider().computePropertiesVector(scanVariables);
        IPhysicalPropertiesVector[] requirements = new IPhysicalPropertiesVector[1];
        requirements[0] = r;
        return new PhysicalRequirements(requirements, IPartitioningRequirementsCoordinator.NO_COORDINATION);
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op,
            IOperatorSchema propagatedSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema)
            throws AlgebricksException {
        WriteResultOperator writeResultOp = (WriteResultOperator) op;
        IMetadataProvider mp = context.getMetadataProvider();

        JobSpecification spec = builder.getJobSpec();
        Pair<IOperatorDescriptor, AlgebricksPartitionConstraint> runtimeAndConstraints = mp.getWriteResultRuntime(
                dataSource, propagatedSchema, keys, payload, additionalFilteringKeys, context, spec);

        builder.contributeHyracksOperator(writeResultOp, runtimeAndConstraints.first);
        builder.contributeAlgebricksPartitionConstraint(runtimeAndConstraints.first, runtimeAndConstraints.second);
        ILogicalOperator src = writeResultOp.getInputs().get(0).getValue();
        builder.contributeGraphEdge(src, 0, writeResultOp, 0);
    }

    @Override
    public boolean expensiveThanMaterialization() {
        return false;
    }
}
