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/**
 * The MIT License
 * Copyright © 2010 JmxTrans team
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.googlecode.jmxtrans.model.output.elastic;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.io.Resources;
import com.googlecode.jmxtrans.exceptions.LifecycleException;
import com.googlecode.jmxtrans.model.Query;
import com.googlecode.jmxtrans.model.Result;
import com.googlecode.jmxtrans.model.Server;
import com.googlecode.jmxtrans.model.ValidationException;
import com.googlecode.jmxtrans.model.output.BaseOutputWriter;
import io.searchbox.client.JestClient;
import io.searchbox.client.JestClientFactory;
import io.searchbox.client.JestResult;
import io.searchbox.client.config.HttpClientConfig;
import io.searchbox.core.Index;
import io.searchbox.indices.CreateIndex;
import io.searchbox.indices.IndicesExists;
import io.searchbox.indices.mapping.PutMapping;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.concurrent.NotThreadSafe;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import static com.googlecode.jmxtrans.util.NumberUtils.isNumeric;

/**
 * Feed data directly into elastic.
 *
 * @author Peter Paul Bakker - [email protected]
 */

@NotThreadSafe
public class ElasticWriter extends BaseOutputWriter {
	
	private static final Logger log = LoggerFactory.getLogger(ElasticWriter.class);
	
	private static final String DEFAULT_ROOT_PREFIX = "jmxtrans";
	private static final String ELASTIC_TYPE_NAME = "jmx-entry";

	private static final Object CREATE_MAPPING_LOCK = new Object();

	// injected for mockito unit tests: do not make final
	private JestClient jestClient;

	private final String rootPrefix;
	private final String connectionUrl;
	private final String indexName;

	@JsonCreator
	public ElasticWriter(
			@JsonProperty("typeNames") ImmutableList typeNames,
			@JsonProperty("booleanAsNumber") boolean booleanAsNumber,
			@JsonProperty("rootPrefix") String rootPrefix,
			@JsonProperty("debug") Boolean debugEnabled,
			@JsonProperty("connectionUrl") String connectionUrl,
			@JsonProperty("settings") Map settings) throws IOException {

		super(typeNames, booleanAsNumber, debugEnabled, settings);

		this.rootPrefix = firstNonNull(
						rootPrefix,
						(String) getSettings().get("rootPrefix"),
						DEFAULT_ROOT_PREFIX);

		this.connectionUrl = connectionUrl;
		this.indexName = this.rootPrefix + "_jmx-entries";
		this.jestClient = createJestClient(connectionUrl);
	}

	private JestClient createJestClient(String connectionUrl) {
		log.info("Create a jest elastic search client for connection url [{}]", connectionUrl);
		JestClientFactory factory = new JestClientFactory();
		factory.setHttpClientConfig(
				new HttpClientConfig.Builder(connectionUrl)
						.multiThreaded(true)
						.build());
		return factory.getObject();
	}

	@Override
	protected void internalWrite(Server server, Query query, ImmutableList results) throws Exception {

		for (Result result : results) {
			log.debug("Query result: [{}]", result);
			Map resultValues = result.getValues();
			for (Entry values : resultValues.entrySet()) {
				Object value = values.getValue();
				if (isNumeric(value)) {

					Map map = new HashMap<>();
					map.put("serverAlias", server.getAlias());
					map.put("server", server.getHost());
					map.put("port", server.getPort());
					map.put("objDomain", result.getObjDomain());
					map.put("className", result.getClassName());
					map.put("typeName", result.getTypeName());
					map.put("attributeName", result.getAttributeName());
					map.put("key", values.getKey());
					map.put("keyAlias", result.getKeyAlias());
					map.put("value", Double.parseDouble(value.toString()));
					map.put("timestamp", result.getEpoch());

					log.debug("Insert into Elastic: Index: [{}] Type: [{}] Map: [{}]", indexName, ELASTIC_TYPE_NAME, map);
					Index index = new Index.Builder(map).index(indexName).type(ELASTIC_TYPE_NAME).build();
					JestResult addToIndex = jestClient.execute(index);
					if (!addToIndex.isSucceeded()) {
						throw new ElasticWriterException(String.format("Unable to write entry to elastic: %s", addToIndex.getErrorMessage()));
					}
				} else {
					log.warn("Unable to submit non-numeric value to Elastic: [{}] from result [{}]", value, result);
				}
			}
		}
	}

	private static void createMappingIfNeeded(JestClient jestClient, String indexName, String typeName) throws ElasticWriterException, IOException {
		synchronized (CREATE_MAPPING_LOCK) {
			IndicesExists indicesExists = new IndicesExists.Builder(indexName).build();
			boolean indexExists = jestClient.execute(indicesExists).isSucceeded();

			if (!indexExists) {

				CreateIndex createIndex = new CreateIndex.Builder(indexName).build();
				jestClient.execute(createIndex);

				URL url = ElasticWriter.class.getResource("/elastic-mapping.json");
				String mapping = Resources.toString(url, Charsets.UTF_8);

				PutMapping putMapping = new PutMapping.Builder(indexName, typeName,mapping).build();

				JestResult result = jestClient.execute(putMapping);
				if (!result.isSucceeded()) {
					throw new ElasticWriterException(String.format("Failed to create mapping: %s", result.getErrorMessage()));
				}
				else {
					log.info("Created mapping for index {}", indexName);
				}
			}
		}
	}

	@Override
	public void start() throws LifecycleException {
		super.start();
		try {
			createMappingIfNeeded(jestClient, indexName, ELASTIC_TYPE_NAME);
		} catch (Exception e) {
			throw new LifecycleException("Failed to create elastic mapping.", e);
		}
	}

	@Override
	public void close() throws LifecycleException {
		super.close();
		jestClient.shutdownClient();
	}

	@Override
	public void validateSetup(Server server, Query query) throws ValidationException {
		// no validations
	}

	@Override
	public String toString() {
		final StringBuilder sb = new StringBuilder("ElasticWriter{");
		sb.append("rootPrefix='").append(rootPrefix).append('\'');
		sb.append(", connectionUrl='").append(connectionUrl).append('\'');
		sb.append(", indexName='").append(indexName).append('\'');
		sb.append('}');
		return sb.toString();
	}
}