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/*
 * 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.search;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.node.ResponseCollectorService;
import org.elasticsearch.search.SearchPhaseResult;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.transport.Transport;

import java.util.Objects;
import java.util.function.BiFunction;

/**
 * A wrapper of search action listeners (search results) that unwraps the query
 * result to get the piggybacked queue size and service time EWMA, adding those
 * values to the coordinating nodes' {@link ResponseCollectorService}.
 */
public final class SearchExecutionStatsCollector extends ActionListener.Delegating {

    private final String nodeId;
    private final ResponseCollectorService collector;
    private final long startNanos;

    SearchExecutionStatsCollector(ActionListener listener,
                                  ResponseCollectorService collector,
                                  String nodeId) {
        super(Objects.requireNonNull(listener, "listener cannot be null"));
        this.collector = Objects.requireNonNull(collector, "response collector cannot be null");
        this.startNanos = System.nanoTime();
        this.nodeId = nodeId;
    }

    public static BiFunction makeWrapper(ResponseCollectorService service) {
        return (connection, originalListener) -> new SearchExecutionStatsCollector(originalListener, service, connection.getNode().getId());
    }

    @Override
    public void onResponse(SearchPhaseResult response) {
        QuerySearchResult queryResult = response.queryResult();
        if (nodeId != null && queryResult != null) {
            final long serviceTimeEWMA = queryResult.serviceTimeEWMA();
            final int queueSize = queryResult.nodeQueueSize();
            final long responseDuration = System.nanoTime() - startNanos;
            // EWMA/queue size may be -1 if the query node doesn't support capturing it
            if (serviceTimeEWMA > 0 && queueSize >= 0) {
                collector.addNodeStatistics(nodeId, queueSize, responseDuration, serviceTimeEWMA);
            }
        }
        delegate.onResponse(response);
    }
}