/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF 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.apache.tuweni.junit;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;

import java.io.IOException;
import java.io.UncheckedIOException;

import org.junit.jupiter.api.extension.AfterAllCallback;
import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ParameterContext;
import org.junit.jupiter.api.extension.ParameterResolutionException;
import org.junit.jupiter.api.extension.ParameterResolver;

/**
 * A junit5 extension, that provides a memory-backed Lucene index writer for tests.
 *
 * The index writer is created for the test suite and injected into any tests with parameters annotated by
 * {@link LuceneIndexWriter}.
 */
public class LuceneIndexWriterExtension implements ParameterResolver, AfterAllCallback {

  private Directory index;
  private IndexWriter writer;

  @Override
  public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext)
      throws ParameterResolutionException {
    return parameterContext.getParameter().isAnnotationPresent(LuceneIndexWriter.class)
        || parameterContext.getParameter().isAnnotationPresent(LuceneIndex.class);
  }

  @Override
  public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext)
      throws ParameterResolutionException {
    if (writer == null) {
      try {
        index = new ByteBuffersDirectory();

        StandardAnalyzer analyzer = new StandardAnalyzer();
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        writer = new IndexWriter(index, config);
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      }
    }
    if (parameterContext.isAnnotated(LuceneIndexWriter.class)) {
      return writer;
    } else {
      return index;
    }
  }

  @Override
  public void afterAll(ExtensionContext context) throws Exception {
    if (writer != null) {
      writer.close();
    }
    if (index != null) {
      index.close();
    }
  }


}
