/*
 * 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.jackrabbit.oak.index;

import org.apache.jackrabbit.oak.index.indexer.document.DocumentStoreIndexerBase;
import org.apache.jackrabbit.oak.index.indexer.document.ElasticIndexer;
import org.apache.jackrabbit.oak.index.indexer.document.ElasticIndexerProvider;
import org.apache.jackrabbit.oak.index.indexer.document.NodeStateIndexer;
import org.apache.jackrabbit.oak.index.indexer.document.NodeStateIndexerProvider;
import org.apache.jackrabbit.oak.plugins.index.elastic.ElasticConnection;
import org.apache.jackrabbit.oak.plugins.index.elastic.index.ElasticRetryPolicy;

import java.util.List;

/*
Out of band indexer for Elasticsearch. Provides support to index document store for  given index definitions or reindex existing indexes
 */
public class ElasticDocumentStoreIndexer extends DocumentStoreIndexerBase {
    private final IndexHelper indexHelper;
    private final String indexPrefix;
    private final String scheme;
    private final String host;
    private final int port;
    private final String apiKeyId;
    private final String apiSecretId;
    private final ElasticRetryPolicy retryPolicy;

    public ElasticDocumentStoreIndexer(IndexHelper indexHelper, IndexerSupport indexerSupport,
                                       String indexPrefix, String scheme,
                                       String host, int port,
                                       String apiKeyId, String apiSecretId) {
        super(indexHelper, indexerSupport);
        this.indexHelper = indexHelper;
        this.indexPrefix = indexPrefix;
        this.scheme = scheme;
        this.host = host;
        this.port = port;
        this.apiKeyId = apiKeyId;
        this.apiSecretId = apiSecretId;
        this.retryPolicy = ElasticRetryPolicy.createRetryPolicyFromSystemProperties();
    }

    protected NodeStateIndexerProvider createProvider() {
        NodeStateIndexerProvider provider = createElasticIndexerProvider();
        closer.register(provider);
        return provider;
    }

    /*
    Used to provision elastic index before starting indexing
    Otherwise proper alias naming and mapping will not be applied
     */
    @Override
    protected void preIndexOperations(List<NodeStateIndexer> indexers) {
        // For all the available indexers check if it's an ElasticIndexer
        // and then provision the index
        for (NodeStateIndexer indexer : indexers) {
            if (indexer instanceof ElasticIndexer) {
                ((ElasticIndexer) indexer).provisionIndex();
            }
        }
    }

    private NodeStateIndexerProvider createElasticIndexerProvider() {
        final ElasticConnection.Builder.BuildStep buildStep = ElasticConnection.newBuilder()
                .withIndexPrefix(indexPrefix)
                .withConnectionParameters(
                        scheme,
                        host,
                        port
                );
        final ElasticConnection connection;
        if (apiKeyId != null && apiSecretId != null) {
            connection = buildStep.withApiKeys(apiKeyId, apiSecretId).build();
        } else {
            connection = buildStep.build();
        }
        closer.register(connection);
        return new ElasticIndexerProvider(indexHelper, connection, retryPolicy);
    }

}
