package eu.dnetlib.ariadneplus.workflows.nodes;

import com.google.common.collect.Lists;
import com.google.gson.Gson;
import eu.dnetlib.enabling.resultset.ResultSetInfo;
import eu.dnetlib.enabling.resultset.client.ResultSetClient;
import eu.dnetlib.msro.workflows.graph.Arc;
import eu.dnetlib.msro.workflows.nodes.AsyncJobNode;
import eu.dnetlib.msro.workflows.procs.Env;
import eu.dnetlib.msro.workflows.procs.Token;
import eu.dnetlib.msro.workflows.util.ResultsetProgressProvider;
import eu.dnetlib.msro.workflows.util.WorkflowsConstants;
import eu.dnetlib.rmi.common.ResultSet;
import eu.dnetlib.rmi.manager.MSROException;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.springframework.beans.factory.annotation.Autowired;

import java.io.IOException;
import java.io.InputStream;
import java.net.ConnectException;
import java.util.List;


public class IndexOnESJobNode extends AsyncJobNode {

	private static final Log log = LogFactory.getLog(IndexOnESJobNode.class);

	private String eprParam;

	@Autowired
	private ResultSetClient resultSetClient;

	private String publisherEndpoint;
	private String datasourceInterface;
	private String datasource;

	//for parallel requests to the publisher endpoint
//	private int nThreads = 5;

	@Override
	protected String execute(final Env env) throws Exception {

		int statusCode = -1;
		String indexOnESResult = "noResult";
		log.info("Publisher endpoint: " + getPublisherEndpoint());
//		PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
//		cm.setMaxTotal(nThreads);
//		CloseableHttpClient client = HttpClients.custom().setConnectionManager(cm).build();
		CloseableHttpClient client = HttpClients.createDefault();

		log.info("IndexOnES endpoint: " + getIndexOnESEndpoint());
		CloseableHttpResponse responsePOST = null;
		try {
			HttpPost post = new HttpPost(getIndexOnESEndpoint());
			List<NameValuePair> params = Lists.newArrayList();
			String[] splits = getDatasourceInterface().split("::");
			String datasource = splits[2];
			String collectionId = splits[3];
			params.add(new BasicNameValuePair("datasource", datasource));
			params.add(new BasicNameValuePair("collectionId", collectionId));
			UrlEncodedFormEntity ent =  new UrlEncodedFormEntity(params, "UTF-8");
			post.setEntity(ent);
			log.info("Calling IndexOnES endpoint with params: "+getDatasource()+" "+getDatasourceInterface());
			responsePOST = client.execute(post);
			statusCode = responsePOST.getStatusLine().getStatusCode();
			try(InputStream responseBody = responsePOST.getEntity().getContent()) {
				indexOnESResult = IOUtils.toString(responseBody, "UTF-8");
			} catch (Exception e) {}
			switch (statusCode) {
			case 200:
				log.info("index on ES completed");
				break;
			default:
				log.error("error indexing on ES  " + responsePOST.getStatusLine().getStatusCode() + ": " + responsePOST.getStatusLine().getReasonPhrase());
				break;
			}
		} catch (ConnectException ce) {
			log.error(ce);
			throw new MSROException("Unable to connect to Publisher endpoint" + getIndexOnESEndpoint());
		}
		catch (IOException e) {
			log.error(e);
			throw new MSROException("IO Error" + getIndexOnESEndpoint());
		}
		finally{
			if(responsePOST != null) responsePOST.close();
			client.close();
//			cm.shutdown();
		}

		env.setAttribute(WorkflowsConstants.MAIN_LOG_PREFIX + "statusCode", Integer.toString(statusCode));
		env.setAttribute(WorkflowsConstants.MAIN_LOG_PREFIX + "indexResult", indexOnESResult);

		if (statusCode!=200) {
			throw new MSROException("Error from Publisher endpoint [ status code: " + statusCode + " ]");
		}

		return Arc.DEFAULT_ARC;
	}

	public String getPublisherEndpoint() {
		return publisherEndpoint;
	}
	
	private String getIndexOnESEndpoint() {
		return publisherEndpoint.concat("/indexOnES");
	}

	public void setPublisherEndpoint(final String publisherEndpoint) {
		this.publisherEndpoint = publisherEndpoint;
	}

	public ResultSetClient getResultSetClient() {
		return resultSetClient;
	}

	public void setResultSetClient(final ResultSetClient resultSetClient) {
		this.resultSetClient = resultSetClient;
	}

	public String getEprParam() {
		return eprParam;
	}

	public void setEprParam(String eprParam) {
		this.eprParam = eprParam;
	}
	
	public String getDatasourceInterface() {
		return datasourceInterface;
	}

	
	public void setDatasourceInterface(String datasourceInterface) {
		this.datasourceInterface = datasourceInterface;
	}

	@Override
	protected void beforeStart(Token token) {
		token.setProgressProvider(new ResultsetProgressProvider(token.getEnv().getAttribute(getEprParam(), ResultSet.class), this.resultSetClient));
	}

	public String getDatasource() {
		return datasource;
	}

	public void setDatasource(String datasource) {
		this.datasource = datasource;
	}

}