/*
 * 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.elasticsearch.Version;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.indices.analysis.AnalysisModule;
import org.elasticsearch.plugins.AnalysisPlugin;
import org.elasticsearch.test.ESTestCase;
import org.elasticsearch.test.IndexSettingsModule;

import java.io.IOException;
import java.nio.file.Path;
import java.util.Arrays;

public class AnalysisTestsHelper {

    public static ESTestCase.TestAnalysis createTestAnalysisFromClassPath(Path baseDir,
            String resource) throws IOException {
        Settings settings = Settings.builder()
                .loadFromStream(resource, AnalysisTestsHelper.class.getResourceAsStream(resource))
                .put(Environment.PATH_HOME_SETTING.getKey(), baseDir.toString())
                .build();

        return createTestAnalysisFromSettings(settings);
    }

    public static ESTestCase.TestAnalysis createTestAnalysisFromSettings(
            Settings settings, AnalysisPlugin... plugins) throws IOException {
        if (settings.get(IndexMetaData.SETTING_VERSION_CREATED) == null) {
            settings = Settings.builder().put(settings)
                    .put(IndexMetaData.SETTING_VERSION_CREATED, Version.CURRENT).build();
        }
        IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", settings);
        AnalysisRegistry analysisRegistry =
                new AnalysisModule(new Environment(settings), Arrays.asList(plugins))
                .getAnalysisRegistry();
        return new ESTestCase.TestAnalysis(analysisRegistry.build(indexSettings),
            analysisRegistry.buildTokenFilterFactories(indexSettings),
            analysisRegistry.buildTokenizerFactories(indexSettings),
            analysisRegistry.buildCharFilterFactories(indexSettings));
    }
}