/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.action.admin.cluster.node.stats;

import org.elasticsearch.action.FailedNodeException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.nodes.BaseNodeRequest;
import org.elasticsearch.action.support.nodes.TransportNodesAction;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.node.NodeService;
import org.elasticsearch.tasks.CancellableTask;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.tasks.TaskId;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class TransportNodesStatsAction extends TransportNodesAction<NodesStatsRequest,
                                                                    NodesStatsResponse,
                                                                    TransportNodesStatsAction.NodeStatsRequest,
                                                                    NodeStats> {

    private final NodeService nodeService;

    @Inject
    public TransportNodesStatsAction(ThreadPool threadPool, ClusterService clusterService, TransportService transportService,
                                     NodeService nodeService, ActionFilters actionFilters) {
        super(NodesStatsAction.NAME, threadPool, clusterService, transportService, actionFilters,
            NodesStatsRequest::new, NodeStatsRequest::new, ThreadPool.Names.MANAGEMENT, NodeStats.class);
        this.nodeService = nodeService;
    }

    @Override
    protected NodesStatsResponse newResponse(NodesStatsRequest request, List<NodeStats> responses, List<FailedNodeException> failures) {
        return new NodesStatsResponse(clusterService.getClusterName(), responses, failures);
    }

    @Override
    protected NodeStatsRequest newNodeRequest(NodesStatsRequest request) {
        return new NodeStatsRequest(request);
    }

    @Override
    protected NodeStats newNodeResponse(StreamInput in) throws IOException {
        return new NodeStats(in);
    }

    @Override
    protected NodeStats nodeOperation(NodeStatsRequest nodeStatsRequest, Task task) {
        assert task instanceof CancellableTask;
        return nodeOperation(nodeStatsRequest);
    }

    @Override
    protected NodeStats nodeOperation(NodeStatsRequest nodeStatsRequest) {
        NodesStatsRequest request = nodeStatsRequest.request;
        Set<String> metrics = request.requestedMetrics();
        return nodeService.stats(
            request.indices(),
            NodesStatsRequest.Metric.OS.containedIn(metrics),
            NodesStatsRequest.Metric.PROCESS.containedIn(metrics),
            NodesStatsRequest.Metric.JVM.containedIn(metrics),
            NodesStatsRequest.Metric.THREAD_POOL.containedIn(metrics),
            NodesStatsRequest.Metric.FS.containedIn(metrics),
            NodesStatsRequest.Metric.TRANSPORT.containedIn(metrics),
            NodesStatsRequest.Metric.HTTP.containedIn(metrics),
            NodesStatsRequest.Metric.BREAKER.containedIn(metrics),
            NodesStatsRequest.Metric.SCRIPT.containedIn(metrics),
            NodesStatsRequest.Metric.DISCOVERY.containedIn(metrics),
            NodesStatsRequest.Metric.INGEST.containedIn(metrics),
            NodesStatsRequest.Metric.ADAPTIVE_SELECTION.containedIn(metrics),
            NodesStatsRequest.Metric.SCRIPT_CACHE.containedIn(metrics),
            NodesStatsRequest.Metric.INDEXING_PRESSURE.containedIn(metrics));
    }

    public static class NodeStatsRequest extends BaseNodeRequest {

        NodesStatsRequest request;

        public NodeStatsRequest(StreamInput in) throws IOException {
            super(in);
            request = new NodesStatsRequest(in);
        }

        NodeStatsRequest(NodesStatsRequest request) {
            this.request = request;
        }

        @Override
        public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
            return new CancellableTask(id, type, action, "", parentTaskId, headers);
        }

        @Override
        public void writeTo(StreamOutput out) throws IOException {
            super.writeTo(out);
            request.writeTo(out);
        }
    }
}
