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

import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;

import java.io.Serializable;
import java.util.*;

import org.apache.commons.io.IOUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.common.api.zenodo.Community;
import eu.dnetlib.dhp.oa.graph.dump.ResultMapper;
import eu.dnetlib.dhp.oa.graph.dump.Utils;
import eu.dnetlib.dhp.oa.graph.dump.community.CommunityMap;
import eu.dnetlib.dhp.schema.dump.oaf.community.CommunityResult;
import eu.dnetlib.dhp.schema.dump.oaf.community.Project;
import eu.dnetlib.dhp.schema.oaf.Relation;
import scala.Tuple2;

/**
 * Preparation of the Project information to be added to the dumped results. For each result associated to at least one
 * Project, a serialization of an instance af ResultProject closs is done. ResultProject contains the resultId, and the
 * list of Projects (as in eu.dnetlib.dhp.schema.dump.oaf.community.Project) it is associated to
 */
public class SparkDumpFunderResults implements Serializable {
	private static final Logger log = LoggerFactory.getLogger(SparkDumpFunderResults.class);

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

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

		Boolean isSparkSessionManaged = Optional
			.ofNullable(parser.get("isSparkSessionManaged"))
			.map(Boolean::valueOf)
			.orElse(Boolean.TRUE);
		log.info("isSparkSessionManaged: {}", isSparkSessionManaged);

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

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

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

		SparkConf conf = new SparkConf();

		runWithSparkSession(
			conf,
			isSparkSessionManaged,
			spark -> {
				Utils.removeOutputDir(spark, outputPath);
				writeResultProjectList(spark, inputPath, outputPath, relationPath);
			});
	}

	private static void writeResultProjectList(SparkSession spark, String inputPath, String outputPath,
		String relationPath) {

		Dataset<Relation> relation = Utils
			.readPath(spark, relationPath + "/relation", Relation.class)
			.filter("dataInfo.deletedbyinference = false and relClass = 'isProducedBy'");

		Dataset<CommunityResult> result = Utils
			.readPath(spark, inputPath + "/publication", CommunityResult.class)
			.union(Utils.readPath(spark, inputPath + "/dataset", CommunityResult.class))
			.union(Utils.readPath(spark, inputPath + "/orp", CommunityResult.class))
			.union(Utils.readPath(spark, inputPath + "/software", CommunityResult.class));

		List<String> funderList = relation
			.select("target")
			.map((MapFunction<Row, String>) value -> value.getString(0).substring(0, 15), Encoders.STRING())
			.distinct()
			.collectAsList();

//		Dataset<CommunityResult> results = result
//			.joinWith(relation, result.col("id").equalTo(relation.col("target")), "inner")
//			.map((MapFunction<Tuple2<CommunityResult, Relation>, CommunityResult>) value -> {
//				return value._1();
//			}, Encoders.bean(CommunityResult.class));

		funderList.forEach(funder -> writeFunderResult(funder, result, outputPath));

	}

	private static void writeFunderResult(String funder, Dataset<CommunityResult> results, String outputPath) {

		results.map((MapFunction<CommunityResult, CommunityResult>) r -> {
			if (!Optional.ofNullable(r.getProjects()).isPresent()) {
				return null;
			}
			for (Project p : r.getProjects()) {
				if (p.getId().startsWith(funder)) {
					return r;
				}
			}
			return null;
		}, Encoders.bean(CommunityResult.class))
			.filter(Objects::nonNull)
			.write()
			.mode(SaveMode.Overwrite)
			.option("compression", "gzip")
			.json(outputPath + "/" + funder);
	}

}