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/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.action.search;

import org.apache.logging.log4j.Logger;
import org.opensearch.cluster.ClusterState;
import org.opensearch.cluster.routing.GroupShardsIterator;
import org.opensearch.core.action.ActionListener;
import org.opensearch.search.SearchShardTarget;
import org.opensearch.search.builder.SearchSourceBuilder;
import org.opensearch.search.dfs.AggregatedDfs;
import org.opensearch.search.dfs.DfsSearchResult;
import org.opensearch.search.internal.AliasFilter;
import org.opensearch.telemetry.tracing.Tracer;
import org.opensearch.transport.Transport;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Executor;
import java.util.function.BiFunction;

/**
 * Async action for DFS Query Then Fetch
 *
 * @opensearch.internal
 */
final class SearchDfsQueryThenFetchAsyncAction extends AbstractSearchAsyncAction {

    private final SearchPhaseController searchPhaseController;

    private final QueryPhaseResultConsumer queryPhaseResultConsumer;

    SearchDfsQueryThenFetchAsyncAction(
        final Logger logger,
        final SearchTransportService searchTransportService,
        final BiFunction nodeIdToConnection,
        final Map aliasFilter,
        final Map concreteIndexBoosts,
        final Map> indexRoutings,
        final SearchPhaseController searchPhaseController,
        final Executor executor,
        final QueryPhaseResultConsumer queryPhaseResultConsumer,
        final SearchRequest request,
        final ActionListener listener,
        final GroupShardsIterator shardsIts,
        final TransportSearchAction.SearchTimeProvider timeProvider,
        final ClusterState clusterState,
        final SearchTask task,
        SearchResponse.Clusters clusters,
        SearchRequestContext searchRequestContext,
        final Tracer tracer
    ) {
        super(
            SearchPhaseName.DFS_PRE_QUERY.getName(),
            logger,
            searchTransportService,
            nodeIdToConnection,
            aliasFilter,
            concreteIndexBoosts,
            indexRoutings,
            executor,
            request,
            listener,
            shardsIts,
            timeProvider,
            clusterState,
            task,
            new ArraySearchPhaseResults<>(shardsIts.size()),
            request.getMaxConcurrentShardRequests(),
            clusters,
            searchRequestContext,
            tracer
        );
        this.queryPhaseResultConsumer = queryPhaseResultConsumer;
        this.searchPhaseController = searchPhaseController;
        SearchProgressListener progressListener = task.getProgressListener();
        SearchSourceBuilder sourceBuilder = request.source();
        progressListener.notifyListShards(
            SearchProgressListener.buildSearchShards(this.shardsIts),
            SearchProgressListener.buildSearchShards(toSkipShardsIts),
            clusters,
            sourceBuilder == null || sourceBuilder.size() != 0
        );
    }

    @Override
    protected void executePhaseOnShard(
        final SearchShardIterator shardIt,
        final SearchShardTarget shard,
        final SearchActionListener listener
    ) {
        getSearchTransport().sendExecuteDfs(
            getConnection(shard.getClusterAlias(), shard.getNodeId()),
            buildShardSearchRequest(shardIt),
            getTask(),
            listener
        );
    }

    @Override
    protected SearchPhase getNextPhase(final SearchPhaseResults results, SearchPhaseContext context) {
        final List dfsSearchResults = results.getAtomicArray().asList();
        final AggregatedDfs aggregatedDfs = searchPhaseController.aggregateDfs(dfsSearchResults);

        return new DfsQueryPhase(
            dfsSearchResults,
            aggregatedDfs,
            queryPhaseResultConsumer,
            (queryResults) -> new FetchSearchPhase(queryResults, searchPhaseController, aggregatedDfs, context),
            context
        );
    }
}