package eu.dnetlib.dhp.oa.dedup;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import org.apache.commons.io.IOUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.graphx.Edge;
import org.apache.spark.rdd.RDD;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.SaveMode;
import org.apache.spark.sql.SparkSession;
import org.dom4j.DocumentException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.schema.oaf.DataInfo;
import eu.dnetlib.dhp.schema.oaf.KeyValue;
import eu.dnetlib.dhp.schema.oaf.Qualifier;
import eu.dnetlib.dhp.schema.oaf.Relation;
import eu.dnetlib.dhp.utils.ISLookupClientFactory;
import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpException;
import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;
import eu.dnetlib.pace.config.DedupConfig;

//copy simrels (verified) from relation to the workdir in order to make them available for the deduplication
public class SparkCopyOpenorgsSimRels extends AbstractSparkAction {
	private static final Logger log = LoggerFactory.getLogger(SparkCopyOpenorgsSimRels.class);

	public SparkCopyOpenorgsSimRels(ArgumentApplicationParser parser, SparkSession spark) {
		super(parser, spark);
	}

	public static void main(String[] args) throws Exception {
		ArgumentApplicationParser parser = new ArgumentApplicationParser(
			IOUtils
				.toString(
					SparkCopyOpenorgsSimRels.class
						.getResourceAsStream(
							"/eu/dnetlib/dhp/oa/dedup/copyOpenorgsMergeRels_parameters.json")));
		parser.parseArgument(args);

		SparkConf conf = new SparkConf();
		new SparkCopyOpenorgsSimRels(parser, getSparkSession(conf))
			.run(ISLookupClientFactory.getLookUpService(parser.get("isLookUpUrl")));
	}

	@Override
	public void run(ISLookUpService isLookUpService)
		throws DocumentException, IOException, ISLookUpException {

		// read oozie parameters
		final String graphBasePath = parser.get("graphBasePath");
		final String actionSetId = parser.get("actionSetId");
		final String workingPath = parser.get("workingPath");
		final int numPartitions = Optional
			.ofNullable(parser.get("numPartitions"))
			.map(Integer::valueOf)
			.orElse(NUM_PARTITIONS);

		log.info("numPartitions: '{}'", numPartitions);
		log.info("graphBasePath: '{}'", graphBasePath);
		log.info("actionSetId:   '{}'", actionSetId);
		log.info("workingPath:   '{}'", workingPath);

		log.info("Copying OpenOrgs SimRels");

		final String outputPath = DedupUtility.createSimRelPath(workingPath, actionSetId, "organization");

		final String relationPath = DedupUtility.createEntityPath(graphBasePath, "relation");

		Dataset<Relation> rawRels = spark
			.read()
			.textFile(relationPath)
			.map(patchRelFn(), Encoders.bean(Relation.class))
			.filter(this::filterOpenorgsRels);

		saveParquet(rawRels, outputPath, SaveMode.Append);

		log.info("Copied " + rawRels.count() + " Similarity Relations");
	}

	private static MapFunction<String, Relation> patchRelFn() {
		return value -> {
			final Relation rel = OBJECT_MAPPER.readValue(value, Relation.class);
			if (rel.getDataInfo() == null) {
				rel.setDataInfo(new DataInfo());
			}
			return rel;
		};
	}

	private boolean filterOpenorgsRels(Relation rel) {

		if (rel.getRelClass().equals("isSimilarTo") && rel.getRelType().equals("organizationOrganization")
			&& rel.getSubRelType().equals("dedup") && isOpenorgs(rel))
			return true;
		return false;
	}

	private boolean isOpenorgs(Relation rel) {

		if (rel.getCollectedfrom() != null) {
			for (KeyValue k : rel.getCollectedfrom()) {
				if (k.getValue() != null && k.getValue().equals("OpenOrgs Database")) {
					return true;
				}
			}
		}
		return false;
	}
}