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 * 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
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package org.elasticsearch.similarity;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.test.ESIntegTestCase;

import static org.elasticsearch.action.support.WriteRequest.RefreshPolicy.IMMEDIATE;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
import static org.elasticsearch.index.query.QueryBuilders.matchQuery;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.not;

public class SimilarityIT extends ESIntegTestCase {
    public void testCustomBM25Similarity() throws Exception {
        try {
            client().admin().indices().prepareDelete("test").execute().actionGet();
        } catch (Exception e) {
            // ignore
        }

        client().admin().indices().prepareCreate("test")
                .addMapping("type1", jsonBuilder().startObject()
                        .startObject("type1")
                            .startObject("properties")
                                .startObject("field1")
                                    .field("similarity", "custom")
                                    .field("type", "text")
                                .endObject()
                                .startObject("field2")
                                    .field("similarity", "classic")
                                    .field("type", "text")
                                .endObject()
                            .endObject()
                        .endObject()
                    .endObject())
                .setSettings(Settings.builder()
                        .put("index.number_of_shards", 1)
                        .put("index.number_of_replicas", 0)
                        .put("similarity.custom.type", "BM25")
                        .put("similarity.custom.k1", 2.0f)
                        .put("similarity.custom.b", 0.5f)
                ).execute().actionGet();

        client().prepareIndex("test", "type1", "1").setSource("field1", "the quick brown fox jumped over the lazy dog",
                                                            "field2", "the quick brown fox jumped over the lazy dog")
                .setRefreshPolicy(IMMEDIATE).execute().actionGet();

        SearchResponse bm25SearchResponse = client().prepareSearch().setQuery(matchQuery("field1", "quick brown fox")).execute().actionGet();
        assertThat(bm25SearchResponse.getHits().getTotalHits(), equalTo(1L));
        float bm25Score = bm25SearchResponse.getHits().getHits()[0].getScore();

        SearchResponse defaultSearchResponse = client().prepareSearch().setQuery(matchQuery("field2", "quick brown fox")).execute().actionGet();
        assertThat(defaultSearchResponse.getHits().getTotalHits(), equalTo(1L));
        float defaultScore = defaultSearchResponse.getHits().getHits()[0].getScore();

        assertThat(bm25Score, not(equalTo(defaultScore)));
    }
}