/*
 * Copyright (C) 2018-2020. Huawei Technologies Co., Ltd. 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 io.prestosql.sql.planner.plan;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import io.prestosql.metadata.TableHandle;
import io.prestosql.sql.planner.Symbol;
import io.prestosql.sql.planner.plan.TableWriterNode.WriterTarget;

import javax.annotation.concurrent.Immutable;

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

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

@Immutable
public class VacuumTableNode
        extends PlanNode
{
    private final TableHandle table;
    private final String partition;
    private final boolean isFull;
    private final WriterTarget target;
    private final Symbol rowCountSymbol;
    private final Symbol fragmentSymbol;
    private final Optional<StatisticAggregations> statisticsAggregation;
    private final Optional<StatisticAggregationsDescriptor<Symbol>> statisticsAggregationDescriptor;
    private final List<Symbol> inputSymbols;
    private final List<Symbol> outputs;

    @JsonCreator
    public VacuumTableNode(
            @JsonProperty("id") PlanNodeId id,
            @JsonProperty("table") TableHandle table,
            @JsonProperty("target") WriterTarget target,
            @JsonProperty("rowCountSymbol") Symbol rowCountSymbol,
            @JsonProperty("fragmentSymbol") Symbol fragmentSymbol,
            @JsonProperty("partition") String partition,
            @JsonProperty("full") boolean isFull,
            @JsonProperty("inputSymbols") List<Symbol> inputSymbols,
            @JsonProperty("statisticsAggregation") Optional<StatisticAggregations> statisticsAggregation,
            @JsonProperty("statisticsAggregationDescriptor") Optional<StatisticAggregationsDescriptor<Symbol>> statisticsAggregationDescriptor)
    {
        super(id);
        this.table = requireNonNull(table, "table is null");
        this.target = requireNonNull(target, "target is null");
        this.rowCountSymbol = requireNonNull(rowCountSymbol, "rowCountSymbol is null");
        this.fragmentSymbol = requireNonNull(fragmentSymbol, "fragmentSymbol is null");
        this.partition = requireNonNull(partition, "partition is null");
        this.isFull = isFull;
        this.inputSymbols = inputSymbols;
        this.statisticsAggregation = requireNonNull(statisticsAggregation, "statisticsAggregation is null");
        this.statisticsAggregationDescriptor = requireNonNull(statisticsAggregationDescriptor, "statisticsAggregationDescriptor is null");
        checkArgument(statisticsAggregation.isPresent() == statisticsAggregationDescriptor.isPresent(), "statisticsAggregation and statisticsAggregationDescriptor must be either present or absent");

        ImmutableList.Builder<Symbol> outputs = ImmutableList.<Symbol>builder()
                .add(rowCountSymbol)
                .add(fragmentSymbol);
        statisticsAggregation.ifPresent(aggregation -> {
            outputs.addAll(aggregation.getGroupingSymbols());
            outputs.addAll(aggregation.getAggregations().keySet());
        });
        this.outputs = outputs.build();
    }

    @JsonProperty("table")
    public TableHandle getTable()
    {
        return table;
    }

    @JsonProperty("partition")
    public String getPartition()
    {
        return partition;
    }

    @JsonProperty("target")
    public WriterTarget getTarget()
    {
        return target;
    }

    @JsonProperty("full")
    public boolean isFull()
    {
        return isFull;
    }

    @JsonProperty
    public Symbol getRowCountSymbol()
    {
        return rowCountSymbol;
    }

    @JsonProperty
    public Symbol getFragmentSymbol()
    {
        return fragmentSymbol;
    }

    @JsonProperty
    public List<Symbol> getInputSymbols()
    {
        return inputSymbols;
    }

    @JsonProperty
    public Optional<StatisticAggregations> getStatisticsAggregation()
    {
        return statisticsAggregation;
    }

    @JsonProperty
    public Optional<StatisticAggregationsDescriptor<Symbol>> getStatisticsAggregationDescriptor()
    {
        return statisticsAggregationDescriptor;
    }

    @Override
    public List<PlanNode> getSources()
    {
        return ImmutableList.of();
    }

    @Override
    public List<Symbol> getOutputSymbols()
    {
        return outputs;
    }

    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("table", table)
                .add("full", isFull)
                .add("partition", partition)
                .toString();
    }

    @Override
    public PlanNode replaceChildren(List<PlanNode> newChildren)
    {
        checkArgument(newChildren.isEmpty(), "newChildren is not empty");
        return this;
    }

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