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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.execution.scheduler;

import io.trino.execution.NodeTaskMap;
import io.trino.execution.PartitionedSplitsInfo;
import io.trino.execution.RemoteTask;
import io.trino.metadata.InternalNode;
import io.trino.spi.SplitWeight;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

import static com.google.common.base.Preconditions.checkArgument;
import static java.lang.Math.addExact;
import static java.util.Objects.requireNonNull;

public final class NodeAssignmentStats
{
    private final NodeTaskMap nodeTaskMap;
    private final Map nodeTotalSplitsInfo;
    private final Map stageQueuedSplitInfo;

    public NodeAssignmentStats(NodeTaskMap nodeTaskMap, NodeMap nodeMap, List existingTasks)
    {
        this.nodeTaskMap = requireNonNull(nodeTaskMap, "nodeTaskMap is null");
        int nodeMapSize = nodeMap.getNodesByHostAndPort().size();
        this.nodeTotalSplitsInfo = new HashMap<>(nodeMapSize);
        this.stageQueuedSplitInfo = new HashMap<>(nodeMapSize);

        for (RemoteTask task : existingTasks) {
            checkArgument(stageQueuedSplitInfo.put(task.getNodeId(), new PendingSplitInfo(task.getQueuedPartitionedSplitsInfo(), task.getUnacknowledgedPartitionedSplitCount())) == null, "A single stage may not have multiple tasks running on the same node");
        }

        // pre-populate the assignment counts with zeros
        if (existingTasks.size() < nodeMapSize) {
            Function createEmptySplitInfo = ignored -> new PendingSplitInfo(PartitionedSplitsInfo.forZeroSplits(), 0);
            for (InternalNode node : nodeMap.getNodesByHostAndPort().values()) {
                stageQueuedSplitInfo.computeIfAbsent(node.getNodeIdentifier(), createEmptySplitInfo);
            }
        }
    }

    public long getTotalSplitsWeight(InternalNode node)
    {
        PartitionedSplitsInfo nodeTotalSplits = nodeTotalSplitsInfo.computeIfAbsent(node, nodeTaskMap::getPartitionedSplitsOnNode);
        PendingSplitInfo stageInfo = stageQueuedSplitInfo.get(node.getNodeIdentifier());
        if (stageInfo == null) {
            return nodeTotalSplits.getWeightSum();
        }
        return addExact(nodeTotalSplits.getWeightSum(), stageInfo.getAssignedSplitsWeight());
    }

    public long getQueuedSplitsWeightForStage(InternalNode node)
    {
        return getQueuedSplitsWeightForStage(node.getNodeIdentifier());
    }

    public long getQueuedSplitsWeightForStage(String nodeId)
    {
        PendingSplitInfo stageInfo = stageQueuedSplitInfo.get(nodeId);
        return stageInfo == null ? 0 : stageInfo.getQueuedSplitsWeight();
    }

    public int getUnacknowledgedSplitCountForStage(InternalNode node)
    {
        PendingSplitInfo stageInfo = stageQueuedSplitInfo.get(node.getNodeIdentifier());
        return stageInfo == null ? 0 : stageInfo.getUnacknowledgedSplitCount();
    }

    public void addAssignedSplit(InternalNode node, SplitWeight splitWeight)
    {
        getOrCreateStageSplitInfo(node).addAssignedSplit(splitWeight);
    }

    public void removeAssignedSplit(InternalNode node, SplitWeight splitWeight)
    {
        getOrCreateStageSplitInfo(node).removeAssignedSplit(splitWeight);
    }

    private PendingSplitInfo getOrCreateStageSplitInfo(InternalNode node)
    {
        String nodeId = node.getNodeIdentifier();
        // Avoids the extra per-invocation lambda allocation of computeIfAbsent since assigning a split to an existing task more common than creating a new task
        PendingSplitInfo stageInfo = stageQueuedSplitInfo.get(nodeId);
        if (stageInfo == null) {
            stageInfo = new PendingSplitInfo(PartitionedSplitsInfo.forZeroSplits(), 0);
            stageQueuedSplitInfo.put(nodeId, stageInfo);
        }
        return stageInfo;
    }

    private static final class PendingSplitInfo
    {
        private final long queuedSplitsWeight;
        private final int unacknowledgedSplitCount;
        private int assignedSplits;
        private long assignedSplitsWeight;

        private PendingSplitInfo(PartitionedSplitsInfo queuedSplitsInfo, int unacknowledgedSplitCount)
        {
            this.queuedSplitsWeight = queuedSplitsInfo.getWeightSum();
            this.unacknowledgedSplitCount = unacknowledgedSplitCount;
        }

        public long getAssignedSplitsWeight()
        {
            return assignedSplitsWeight;
        }

        public long getQueuedSplitsWeight()
        {
            return addExact(queuedSplitsWeight, assignedSplitsWeight);
        }

        public int getUnacknowledgedSplitCount()
        {
            return unacknowledgedSplitCount + assignedSplits;
        }

        public void addAssignedSplit(SplitWeight splitWeight)
        {
            assignedSplits++;
            assignedSplitsWeight = addExact(assignedSplitsWeight, splitWeight.getRawValue());
        }

        public void removeAssignedSplit(SplitWeight splitWeight)
        {
            assignedSplits--;
            assignedSplitsWeight -= splitWeight.getRawValue();
        }
    }
}