package eu.eudat.configurations;

import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager;
import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor;
import org.apache.http.nio.reactor.IOReactorException;
import org.apache.http.nio.reactor.IOReactorExceptionHandler;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

import java.io.IOException;

/**
 * Created by ikalyvas on 7/5/2018.
 */
@Configuration
public class ElasticSearchConfiguration {
    private static final Logger logger = LoggerFactory.getLogger(ElasticSearchConfiguration.class);

    private Environment environment;

    @Autowired
    public ElasticSearchConfiguration(Environment environment) {
        this.environment = environment;
    }

    @Bean(destroyMethod = "close")
    public RestHighLevelClient client() throws Exception {
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY,
                new UsernamePasswordCredentials(this.environment.getProperty("elasticsearch.username"), this.environment.getProperty("elasticsearch.password")));

        try {
            DefaultConnectingIOReactor ioReactor = new DefaultConnectingIOReactor();
            ioReactor.setExceptionHandler(new IOReactorExceptionHandler() {
                @Override
                public boolean handle(IOException e) {
                    logger.warn("System may be unstable: IOReactor encountered a checked exception : " + e.getMessage(), e);
                    return true; // Return true to note this exception as handled, it will not be re-thrown
                }

                @Override
                public boolean handle(RuntimeException e) {
                    logger.warn("System may be unstable: IOReactor encountered a runtime exception : " + e.getMessage(), e);
                    return true; // Return true to note this exception as handled, it will not be re-thrown
                }
            });

            RestHighLevelClient client = new RestHighLevelClient(
                    RestClient.builder(
                            new HttpHost(this.environment.getProperty("elasticsearch.host"),
                                    Integer.parseInt(this.environment.getProperty("elasticsearch.port")), "http"))
                            .setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder
                                    .setDefaultCredentialsProvider(credentialsProvider).setConnectionManager(new PoolingNHttpClientConnectionManager(ioReactor))));
            return client;
        }catch (IOReactorException ex) {
            throw new RuntimeException(ex);
        }
    }
}