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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * Licensed 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 io.gravitee.reporter.elasticsearch;

import io.gravitee.common.service.AbstractService;
import io.gravitee.elasticsearch.client.Client;
import io.gravitee.elasticsearch.version.ElasticsearchInfo;
import io.gravitee.reporter.api.Reportable;
import io.gravitee.reporter.api.Reporter;
import io.gravitee.reporter.api.health.EndpointStatus;
import io.gravitee.reporter.api.http.Metrics;
import io.gravitee.reporter.api.log.Log;
import io.gravitee.reporter.api.monitor.Monitor;
import io.gravitee.reporter.elasticsearch.config.ReporterConfiguration;
import io.gravitee.reporter.elasticsearch.indexer.Indexer;
import io.gravitee.reporter.elasticsearch.mapping.IndexPreparer;
import io.gravitee.reporter.elasticsearch.spring.context.*;
import io.reactivex.BackpressureStrategy;
import io.reactivex.CompletableObserver;
import io.reactivex.Observable;
import io.reactivex.Single;
import io.reactivex.disposables.Disposable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;

import java.util.concurrent.TimeUnit;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class ElasticsearchReporter extends AbstractService implements Reporter {

	private static final Logger LOGGER = LoggerFactory.getLogger(ElasticsearchReporter.class);

	@Autowired
	private Client client;

	@Autowired
	private ReporterConfiguration configuration;

	/**
	 * Indexer is settled in a lazy way as soon as the ES version has been discovered.
	 */
	private Indexer indexer;

	@Override
	protected void doStart() throws Exception {
		if (configuration.isEnabled()) {
			super.doStart();
			LOGGER.info("Starting Elastic reporter engine...");

			ElasticsearchInfo elasticsearchInfo = retreiveElasticSearchInfo();
			AbstractElasticBeanRegistrer elasticsearchBeanRegister = getBeanRegistrerFromElasticsearchInfo(elasticsearchInfo);
			if (elasticsearchBeanRegister == null) {
				LOGGER.error("{} version {} is not supported by this connector", elasticsearchInfo.getVersion().isOpenSearch() ? "OpenSearch" : "ElasticSearch", elasticsearchInfo.getVersion().getNumber());
				LOGGER.info("Starting Elastic reporter engine... ERROR");
				return;
			}

			DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory) applicationContext.getAutowireCapableBeanFactory();
			elasticsearchBeanRegister.register(beanFactory, configuration);

			IndexPreparer preparer = applicationContext.getBean(IndexPreparer.class);
			preparer
				.prepare()
				.doOnComplete(() -> {
					LOGGER.info("Starting Elastic reporter engine... DONE");
				})
				.subscribe(new CompletableObserver() {
					@Override
					public void onSubscribe(Disposable d) {}

					@Override
					public void onComplete() {
						LOGGER.info("Index mapping template successfully defined");
					}

					@Override
					public void onError(Throwable t) {
						LOGGER.error("An error occurs while creating index mapping template", t);
					}
				});

			indexer = applicationContext.getBean(Indexer.class);
		}
	}

	@Override
	public void report(Reportable reportable) {
		if (configuration.isEnabled()) {
			indexer.index(reportable);
		}
	}

	Single rxReport(Reportable reportable) {
		indexer.index(reportable);
		return Single.just(reportable);
	}

	@Override
	public boolean canHandle(Reportable reportable) {
		return reportable instanceof Metrics ||
				reportable instanceof EndpointStatus ||
				reportable instanceof Monitor ||
				reportable instanceof Log;
	}

	@Override
	protected void doStop() throws Exception {
		if (configuration.isEnabled()) {
			super.doStop();
			LOGGER.info("Stopping Elastic reporter engine... DONE");
		}
	}

	private ElasticsearchInfo retreiveElasticSearchInfo() {
		// Wait for a connection to ES and retry each 5 seconds
		Single elasticsearchInfoSingle = client.getInfo()
				.retryWhen(error -> error.flatMap(
						throwable -> Observable.just(new Object()).delay(5, TimeUnit.SECONDS).toFlowable(BackpressureStrategy.LATEST)));
		elasticsearchInfoSingle.subscribe();
		return elasticsearchInfoSingle.blockingGet();
	}

	protected AbstractElasticBeanRegistrer getBeanRegistrerFromElasticsearchInfo(ElasticsearchInfo elasticsearchInfo) {
		if (elasticsearchInfo.getVersion().isOpenSearch()) {
			if (elasticsearchInfo.getVersion().getMajorVersion() == 1) {
				return new OpenSearchBeanRegistrer();
			}
			return null;
		}

		switch (elasticsearchInfo.getVersion().getMajorVersion()) {
			case 5: return new Elastic5xBeanRegistrer();
			case 6: return new Elastic6xBeanRegistrer();
			case 7: return new Elastic7xBeanRegistrer();
			default: return null;
		}
	}
}