/*
 * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

package org.elasticsearch.search.scroll;

import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.test.ESIntegTestCase;

import java.util.ArrayList;
import java.util.List;

import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAllSuccessful;
import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.lessThan;

@ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.TEST, numDataNodes = 0, numClientNodes = 0)
public class SearchScrollWithFailingNodesIT extends ESIntegTestCase {
    @Override
    protected int numberOfShards() {
        return 2;
    }

    @Override
    protected int numberOfReplicas() {
        return 0;
    }

    public void testScanScrollWithShardExceptions() throws Exception {
        internalCluster().startNode();
        internalCluster().startNode();
        assertAcked(
            prepareCreate("test")
                // Enforces that only one shard can only be allocated to a single node
                .setSettings(
                    Settings.builder()
                        .put(indexSettings())
                        .put(ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE_SETTING.getKey(), 1)
                )
        );

        List<IndexRequestBuilder> writes = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            writes.add(prepareIndex("test").setSource(jsonBuilder().startObject().field("field", i).endObject()));
        }
        indexRandom(false, writes);
        refresh();

        SearchResponse searchResponse = prepareSearch().setQuery(matchAllQuery())
            .setSize(10)
            .setScroll(TimeValue.timeValueMinutes(1))
            .get();
        try {
            assertAllSuccessful(searchResponse);
            long numHits = 0;
            do {
                numHits += searchResponse.getHits().getHits().length;
                searchResponse.decRef();
                searchResponse = client().prepareSearchScroll(searchResponse.getScrollId()).setScroll(TimeValue.timeValueMinutes(1)).get();
                assertAllSuccessful(searchResponse);
            } while (searchResponse.getHits().getHits().length > 0);
            assertThat(numHits, equalTo(100L));
            clearScroll("_all");

            internalCluster().stopRandomNonMasterNode();

            searchResponse.decRef();
            searchResponse = prepareSearch().setQuery(matchAllQuery()).setSize(10).setScroll(TimeValue.timeValueMinutes(1)).get();
            assertThat(searchResponse.getSuccessfulShards(), lessThan(searchResponse.getTotalShards()));
            numHits = 0;
            int numberOfSuccessfulShards = searchResponse.getSuccessfulShards();
            do {
                numHits += searchResponse.getHits().getHits().length;
                searchResponse.decRef();
                searchResponse = client().prepareSearchScroll(searchResponse.getScrollId()).setScroll(TimeValue.timeValueMinutes(1)).get();
                assertThat(searchResponse.getSuccessfulShards(), equalTo(numberOfSuccessfulShards));
            } while (searchResponse.getHits().getHits().length > 0);
            assertThat(numHits, greaterThan(0L));

            clearScroll(searchResponse.getScrollId());
        } finally {
            searchResponse.decRef();
        }
    }

}