package eu.dnetlib.dhp.oa.graph.dump;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Serializable;
import java.nio.charset.StandardCharsets;
import java.util.Optional;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.dom4j.DocumentException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.SAXException;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpException;

/**
 * This class connects with the IS related to the isLookUpUrl got as parameter. It saves the information about the
 * context that will guide the dump of the results. The information saved is a HashMap. The key is the id of a community
 * - research infrastructure/initiative , the value is the label of the research community - research
 * infrastructure/initiative.
 */

public class SaveCommunityMap implements Serializable {

	private static final Logger log = LoggerFactory.getLogger(SaveCommunityMap.class);
	private final transient QueryInformationSystem queryInformationSystem;

	private final transient BufferedWriter writer;

	public SaveCommunityMap(String hdfsPath, String hdfsNameNode, String isLookUpUrl) throws IOException {
		final Configuration conf = new Configuration();
		conf.set("fs.defaultFS", hdfsNameNode);
		FileSystem fileSystem = FileSystem.get(conf);
		Path hdfsWritePath = new Path(hdfsPath);

		if (fileSystem.exists(hdfsWritePath)) {
			fileSystem.delete(hdfsWritePath, true);
		}

		queryInformationSystem = new QueryInformationSystem();
		queryInformationSystem.setIsLookUp(Utils.getIsLookUpService(isLookUpUrl));

		FSDataOutputStream fos = fileSystem.create(hdfsWritePath);
		writer = new BufferedWriter(new OutputStreamWriter(fos, StandardCharsets.UTF_8));
	}

	public static void main(String[] args) throws Exception {
		String jsonConfiguration = IOUtils
			.toString(
				SaveCommunityMap.class
					.getResourceAsStream(
						"/eu/dnetlib/dhp/oa/graph/dump/input_cm_parameters.json"));

		final ArgumentApplicationParser parser = new ArgumentApplicationParser(jsonConfiguration);
		parser.parseArgument(args);

		final String nameNode = parser.get("nameNode");
		log.info("nameNode: {}", nameNode);

		final String outputPath = parser.get("outputPath");
		log.info("outputPath: {}", outputPath);

		final String isLookUpUrl = parser.get("isLookUpUrl");
		log.info("isLookUpUrl: {}", isLookUpUrl);

		final Boolean singleCommunity = Optional
			.ofNullable(parser.get("singleDeposition"))
			.map(Boolean::valueOf)
			.orElse(false);

		final String community_id = Optional.ofNullable(parser.get("communityId")).orElse(null);

		final SaveCommunityMap scm = new SaveCommunityMap(outputPath, nameNode, isLookUpUrl);

		scm.saveCommunityMap(singleCommunity, community_id);

	}

	private void saveCommunityMap(boolean singleCommunity, String communityId)
		throws ISLookUpException, IOException, DocumentException, SAXException {
		final String communityMapString = Utils.OBJECT_MAPPER
			.writeValueAsString(queryInformationSystem.getCommunityMap(singleCommunity, communityId));
		log.info("communityMap {} ", communityMapString);
		writer
			.write(
				communityMapString);
		writer.close();
	}

}