/*
 * 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.aggregations.bucket;

import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.metrics.Stats;
import org.elasticsearch.test.ESIntegTestCase;

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

import static org.elasticsearch.search.aggregations.AggregationBuilders.global;
import static org.elasticsearch.search.aggregations.AggregationBuilders.stats;
import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailuresAndResponse;
import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.sameInstance;
import static org.hamcrest.core.IsNull.notNullValue;

@ESIntegTestCase.SuiteScopeTestCase
public class GlobalIT extends ESIntegTestCase {

    static int numDocs;

    @Override
    public void setupSuiteScopeCluster() throws Exception {
        createIndex("idx");
        createIndex("idx2");
        List<IndexRequestBuilder> builders = new ArrayList<>();
        numDocs = randomIntBetween(3, 20);
        for (int i = 0; i < numDocs / 2; i++) {
            builders.add(
                prepareIndex("idx").setId("" + i + 1)
                    .setSource(jsonBuilder().startObject().field("value", i + 1).field("tag", "tag1").endObject())
            );
        }
        for (int i = numDocs / 2; i < numDocs; i++) {
            builders.add(
                prepareIndex("idx").setId("" + i + 1)
                    .setSource(
                        jsonBuilder().startObject().field("value", i + 1).field("tag", "tag2").field("name", "name" + i + 1).endObject()
                    )
            );
        }
        indexRandom(true, builders);
        ensureSearchable();
    }

    public void testWithStatsSubAggregator() throws Exception {
        assertNoFailuresAndResponse(
            prepareSearch("idx").setQuery(QueryBuilders.termQuery("tag", "tag1"))
                .addAggregation(global("global").subAggregation(stats("value_stats").field("value"))),
            response -> {
                SingleBucketAggregation global = response.getAggregations().get("global");
                assertThat(global, notNullValue());
                assertThat(global.getName(), equalTo("global"));
                assertThat(global.getDocCount(), equalTo((long) numDocs));
                assertThat((long) ((InternalAggregation) global).getProperty("_count"), equalTo((long) numDocs));
                assertThat(global.getAggregations().asList().isEmpty(), is(false));

                Stats stats = global.getAggregations().get("value_stats");
                assertThat((Stats) ((InternalAggregation) global).getProperty("value_stats"), sameInstance(stats));
                assertThat(stats, notNullValue());
                assertThat(stats.getName(), equalTo("value_stats"));
                long sum = 0;
                for (int i = 0; i < numDocs; ++i) {
                    sum += i + 1;
                }
                assertThat(stats.getAvg(), equalTo((double) sum / numDocs));
                assertThat(stats.getMin(), equalTo(1.0));
                assertThat(stats.getMax(), equalTo((double) numDocs));
                assertThat(stats.getCount(), equalTo((long) numDocs));
                assertThat(stats.getSum(), equalTo((double) sum));
            }
        );
    }

    public void testNonTopLevel() throws Exception {
        try {
            prepareSearch("idx").setQuery(QueryBuilders.termQuery("tag", "tag1"))
                .addAggregation(global("global").subAggregation(global("inner_global")))
                .get();

            fail(
                "expected to fail executing non-top-level global aggregator. global aggregations are only allowed as top level"
                    + "aggregations"
            );

        } catch (ElasticsearchException e) {
            assertThat(e.getMessage(), is("all shards failed"));
        }
    }
}