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 * 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.
 */

package org.elasticsearch.index.analysis.synonyms;

import org.apache.logging.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.lucene.all.AllTokenStream;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.analysis.IndexAnalyzers;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.IndexSettingsModule;
import org.hamcrest.MatcherAssert;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

import static org.hamcrest.Matchers.equalTo;

public class SynonymsAnalysisTests extends ESTestCase {
    protected final Logger logger = Loggers.getLogger(getClass());
    private IndexAnalyzers indexAnalyzers;

    public void testSynonymsAnalysis() throws IOException {
        InputStream synonyms = getClass().getResourceAsStream("synonyms.txt");
        InputStream synonymsWordnet = getClass().getResourceAsStream("synonyms_wordnet.txt");
        Path home = createTempDir();
        Path config = home.resolve("config");
        Files.createDirectory(config);
        Files.copy(synonyms, config.resolve("synonyms.txt"));
        Files.copy(synonymsWordnet, config.resolve("synonyms_wordnet.txt"));

        String json = "/org/elasticsearch/index/analysis/synonyms/synonyms.json";
        Settings settings = Settings.builder().
            loadFromStream(json, getClass().getResourceAsStream(json))
                .put(Environment.PATH_HOME_SETTING.getKey(), home)
                .put(IndexMetaData.SETTING_VERSION_CREATED, Version.CURRENT).build();

        IndexSettings idxSettings = IndexSettingsModule.newIndexSettings("index", settings);
        indexAnalyzers = createTestAnalysis(idxSettings, settings).indexAnalyzers;

        match("synonymAnalyzer", "kimchy is the dude abides", "shay is the elasticsearch man!");
        match("synonymAnalyzer_file", "kimchy is the dude abides", "shay is the elasticsearch man!");
        match("synonymAnalyzerWordnet", "abstain", "abstain refrain desist");
        match("synonymAnalyzerWordnet_file", "abstain", "abstain refrain desist");
        match("synonymAnalyzerWithsettings", "kimchy", "sha hay");
    }

    private void match(String analyzerName, String source, String target) throws IOException {
        Analyzer analyzer = indexAnalyzers.get(analyzerName).analyzer();

        TokenStream stream = AllTokenStream.allTokenStream("_all", source, 1.0f, analyzer);
        stream.reset();
        CharTermAttribute termAtt = stream.addAttribute(CharTermAttribute.class);

        StringBuilder sb = new StringBuilder();
        while (stream.incrementToken()) {
            sb.append(termAtt.toString()).append(" ");
        }

        MatcherAssert.assertThat(target, equalTo(sb.toString().trim()));
    }

}
