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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;

import org.apache.lucene.analysis.TokenFilter;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.env.TestEnvironment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.IndexSettingsModule;
import org.elasticsearch.test.VersionUtils;

import java.io.IOException;

public class PreConfiguredTokenFilterTests extends ESTestCase {

    private final Settings emptyNodeSettings = Settings.builder()
            .put(Environment.PATH_HOME_SETTING.getKey(), createTempDir().toString())
            .build();

    public void testCachingWithSingleton() throws IOException {
        PreConfiguredTokenFilter pctf =
                PreConfiguredTokenFilter.singleton("singleton", randomBoolean(),
                        (tokenStream) -> new TokenFilter(tokenStream) {
                            @Override
                            public boolean incrementToken() {
                                return false;
                            }
                        });

        IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", Settings.EMPTY);

        Version version1 = VersionUtils.randomVersion(random());
        Settings settings1 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version1)
                .build();
        TokenFilterFactory tff_v1_1 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "singleton", settings1);
        TokenFilterFactory tff_v1_2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "singleton", settings1);
        assertSame(tff_v1_1, tff_v1_2);

        Version version2 = randomValueOtherThan(version1, () -> randomFrom(VersionUtils.allVersions()));
        Settings settings2 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version2)
                .build();

        TokenFilterFactory tff_v2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "singleton", settings2);
        assertSame(tff_v1_1, tff_v2);
    }

    public void testCachingWithElasticsearchVersion() throws IOException {
        PreConfiguredTokenFilter pctf =
            PreConfiguredTokenFilter.elasticsearchVersion("elasticsearch_version", randomBoolean(),
                (tokenStream, esVersion) -> new TokenFilter(tokenStream) {
                    @Override
                    public boolean incrementToken() {
                        return false;
                    }
                });

        IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", Settings.EMPTY);

        Version version1 = VersionUtils.randomVersion(random());
        Settings settings1 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version1)
                .build();
        TokenFilterFactory tff_v1_1 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "elasticsearch_version", settings1);
        TokenFilterFactory tff_v1_2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "elasticsearch_version", settings1);
        assertSame(tff_v1_1, tff_v1_2);

        Version version2 = randomValueOtherThan(version1, () -> randomFrom(VersionUtils.allVersions()));
        Settings settings2 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version2)
                .build();

        TokenFilterFactory tff_v2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "elasticsearch_version", settings2);
        assertNotSame(tff_v1_1, tff_v2);
    }

    public void testCachingWithLuceneVersion() throws IOException {
        PreConfiguredTokenFilter pctf =
                PreConfiguredTokenFilter.luceneVersion("lucene_version", randomBoolean(),
                        (tokenStream, luceneVersion) -> new TokenFilter(tokenStream) {
                            @Override
                            public boolean incrementToken() {
                                return false;
                            }
                        });

        IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", Settings.EMPTY);

        Version version1 = Version.CURRENT;
        Settings settings1 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version1)
                .build();
        TokenFilterFactory tff_v1_1 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "lucene_version", settings1);
        TokenFilterFactory tff_v1_2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "lucene_version", settings1);
        assertSame(tff_v1_1, tff_v1_2);

        byte major = VersionUtils.getFirstVersion().major;
        Version version2 = Version.fromString(major - 1 + ".0.0");
        Settings settings2 = Settings.builder().put(IndexMetadata.SETTING_VERSION_CREATED, version2)
                .build();

        TokenFilterFactory tff_v2 =
                pctf.get(indexSettings, TestEnvironment.newEnvironment(emptyNodeSettings), "lucene_version", settings2);
        assertNotSame(tff_v1_1, tff_v2);
    }
}
