/*
 * 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.termvectors;

import org.apache.logging.log4j.message.ParameterizedMessage;
import org.opensearch.action.support.ActionFilters;
import org.opensearch.action.support.TransportActions;
import org.opensearch.action.support.single.shard.TransportSingleShardAction;
import org.opensearch.cluster.ClusterState;
import org.opensearch.cluster.metadata.IndexNameExpressionResolver;
import org.opensearch.cluster.routing.ShardIterator;
import org.opensearch.cluster.service.ClusterService;
import org.opensearch.common.inject.Inject;
import org.opensearch.core.common.io.stream.Writeable;
import org.opensearch.core.index.shard.ShardId;
import org.opensearch.index.IndexService;
import org.opensearch.index.shard.IndexShard;
import org.opensearch.index.termvectors.TermVectorsService;
import org.opensearch.indices.IndicesService;
import org.opensearch.threadpool.ThreadPool;
import org.opensearch.transport.TransportService;

/**
 * Performs the multi term shard level get operation.
 *
 * @opensearch.internal
 */
public class TransportShardMultiTermsVectorAction extends TransportSingleShardAction<
    MultiTermVectorsShardRequest,
    MultiTermVectorsShardResponse> {

    private final IndicesService indicesService;

    private static final String ACTION_NAME = MultiTermVectorsAction.NAME + "[shard]";

    @Inject
    public TransportShardMultiTermsVectorAction(
        ClusterService clusterService,
        TransportService transportService,
        IndicesService indicesService,
        ThreadPool threadPool,
        ActionFilters actionFilters,
        IndexNameExpressionResolver indexNameExpressionResolver
    ) {
        super(
            ACTION_NAME,
            threadPool,
            clusterService,
            transportService,
            actionFilters,
            indexNameExpressionResolver,
            MultiTermVectorsShardRequest::new,
            ThreadPool.Names.GET
        );
        this.indicesService = indicesService;
    }

    @Override
    protected boolean isSubAction() {
        return true;
    }

    @Override
    protected Writeable.Reader<MultiTermVectorsShardResponse> getResponseReader() {
        return MultiTermVectorsShardResponse::new;
    }

    @Override
    protected boolean resolveIndex(MultiTermVectorsShardRequest request) {
        return false;
    }

    @Override
    protected ShardIterator shards(ClusterState state, InternalRequest request) {
        return clusterService.operationRouting()
            .getShards(state, request.concreteIndex(), request.request().shardId(), request.request().preference());
    }

    @Override
    protected MultiTermVectorsShardResponse shardOperation(MultiTermVectorsShardRequest request, ShardId shardId) {
        final MultiTermVectorsShardResponse response = new MultiTermVectorsShardResponse();
        final IndexService indexService = indicesService.indexServiceSafe(shardId.getIndex());
        final IndexShard indexShard = indexService.getShard(shardId.id());
        for (int i = 0; i < request.locations.size(); i++) {
            TermVectorsRequest termVectorsRequest = request.requests.get(i);
            try {
                TermVectorsResponse termVectorsResponse = TermVectorsService.getTermVectors(indexShard, termVectorsRequest);
                response.add(request.locations.get(i), termVectorsResponse);
            } catch (RuntimeException e) {
                if (TransportActions.isShardNotAvailableException(e)) {
                    throw e;
                } else {
                    logger.debug(
                        () -> new ParameterizedMessage(
                            "{} failed to execute multi term vectors for [{}]",
                            shardId,
                            termVectorsRequest.id()
                        ),
                        e
                    );
                    response.add(
                        request.locations.get(i),
                        new MultiTermVectorsResponse.Failure(request.index(), termVectorsRequest.id(), e)
                    );
                }
            }
        }

        return response;
    }

    @Override
    protected String getExecutor(MultiTermVectorsShardRequest request, ShardId shardId) {
        IndexService indexService = indicesService.indexServiceSafe(shardId.getIndex());
        return indexService.getIndexSettings().isSearchThrottled()
            ? ThreadPool.Names.SEARCH_THROTTLED
            : super.getExecutor(request, shardId);
    }
}
