package eu.dnetlib.dhp.resulttocommunityfromorganization;

/**
 * @author miriam.baglioni
 * @Date 16/10/23
 */
/**
 * @author miriam.baglioni
 * @Date 16/10/23
 */
import static eu.dnetlib.dhp.PropagationConstant.*;
import static eu.dnetlib.dhp.PropagationConstant.OBJECT_MAPPER;
import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkHiveSession;
import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;

import java.util.*;
import java.util.stream.Collectors;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.io.ObjectWritable;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.function.*;
import org.apache.spark.api.java.function.FilterFunction;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.*;
import org.apache.spark.sql.types.DataTypes;
import org.apache.spark.sql.types.StructType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;

import eu.dnetlib.dhp.api.Utils;
import eu.dnetlib.dhp.api.model.CommunityEntityMap;
import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.schema.common.ModelConstants;
import eu.dnetlib.dhp.schema.oaf.Relation;
import scala.Tuple2;

public class PrepareResultCommunity2 {

	private static final Logger log = LoggerFactory
		.getLogger(eu.dnetlib.dhp.resulttocommunityfromorganization.PrepareResultCommunitySet.class);

	public static void main(String[] args) throws Exception {
		String jsonConfiguration = IOUtils
			.toString(
				eu.dnetlib.dhp.resulttocommunityfromorganization.PrepareResultCommunitySet.class
					.getResourceAsStream(
						"/eu/dnetlib/dhp/resulttocommunityfromorganization/input_preparecommunitytoresult_parameters.json"));

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

		Boolean isSparkSessionManaged = isSparkSessionManaged(parser);
		log.info("isSparkSessionManaged: {}", isSparkSessionManaged);

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

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

		final boolean production = Boolean.valueOf(parser.get("production"));
		log.info("production: {}", production);

		final CommunityEntityMap organizationMap = Utils.getCommunityOrganization(production);
		log.info("organizationMap: {}", new Gson().toJson(organizationMap));

		SparkConf conf = new SparkConf();

		runWithSparkSession(
			conf,
			isSparkSessionManaged,
			spark -> {
				removeOutputDir(spark, outputPath);
				prepareInfo(spark, inputPath, outputPath, organizationMap);
			});
	}

	private static void prepareInfo(
		SparkSession spark,
		String inputPath,
		String outputPath,
		CommunityEntityMap organizationMap) {

		final StructType structureSchema = new StructType()
			.add(
				"dataInfo", new StructType()
					.add("deletedbyinference", DataTypes.BooleanType)
					.add("invisible", DataTypes.BooleanType))
			.add("source", DataTypes.StringType)
			.add("target", DataTypes.StringType)
			.add("relClass", DataTypes.StringType);

		readPath(spark, inputPath, Relation.class)
			.foreach((ForeachFunction<Relation>) r -> System.out.println(new ObjectMapper().writeValueAsString(r)));

		Dataset<Row> resultOrganization = spark
			.read()
			.schema(Encoders.bean(Relation.class).schema())
			.json(inputPath)
			.filter(
				"dataInfo.deletedbyinference != true " +
					"and relClass == '" + ModelConstants.HAS_AUTHOR_INSTITUTION + "'")
			.select(
				new Column("source").as("resultId"),
				new Column("target").as("organizationId"));

		resultOrganization
			.foreach((ForeachFunction<Row>) r -> System.out.println(new ObjectMapper().writeValueAsString(r)));

		Dataset<Row> organizationOrganization = spark
			.read()
			.schema(structureSchema)
			.json(inputPath)
			.filter(
				"dataInfo.deletedbyinference != true " +
					"and relClass == '" + ModelConstants.MERGES + "'")
			.select(
				new Column("source").as("masterOrganization"),
				new Column("target").as("duplicateOrganization"));

		resultOrganization
			.joinWith(
				organizationOrganization, resultOrganization
					.col("organizationId")
					.equalTo(organizationOrganization.col("masterOrganization")),
				"left")
			.groupByKey(
				(MapFunction<Tuple2<Row, Row>, String>) t2 -> (String) t2._1().getAs("resultId"), Encoders.STRING())
			.mapGroups((MapGroupsFunction<String, Tuple2<Row, Row>, ResultCommunityList>) (k, v) -> {
				ResultCommunityList rcl = new ResultCommunityList();
				rcl.setResultId(k);
				ArrayList<String> cl = new ArrayList<>();
				Tuple2<Row, Row> first = v.next();
				cl.addAll(organizationMap.get(first._1().getAs("organizationId")));
				if (Optional.ofNullable(first._2()).isPresent()) {
					cl.addAll(organizationMap.get(first._2().getAs(("duplicateOrganization"))));
				}
				v.forEachRemaining(o -> cl.addAll(organizationMap.get(o._2().getAs("duplicateOrganization"))));
				if (cl.size() == 0)
					return null;
				rcl.setCommunityList(new ArrayList<>(cl.stream().distinct().collect(Collectors.toList())));
				return rcl;
			}, Encoders.bean(ResultCommunityList.class))
			.filter(Objects::nonNull)
			.write()
			.mode(SaveMode.Overwrite)
			.option("compression", "gzip")
			.json(outputPath);

//            Dataset<Relation> relation = readPath(spark, inputPath, Relation.class)
//                    .filter((FilterFunction<Relation>) r -> !r.getDataInfo().getDeletedbyinference() );
//
//            relation.createOrReplaceTempView("relation");
//
//            String query = "SELECT result_organization.source resultId, result_organization.target orgId, org_set merges "
//                    + "FROM (SELECT source, target "
//                    + "      FROM relation "
//                    + "      AND lower(relClass) = '"
//                    + ModelConstants.HAS_AUTHOR_INSTITUTION.toLowerCase()
//                    + "') result_organization "
//                    + "LEFT JOIN (SELECT source, collect_set(target) org_set "
//                    + "      FROM relation "
//                    + "      AND lower(relClass) = '"
//                    + ModelConstants.MERGES.toLowerCase()
//                    + "' "
//                    + "      GROUP BY source) organization_organization "
//                    + "ON result_organization.target = organization_organization.source ";
//
//            Dataset<ResultOrganizations> result_organizationset = spark
//                    .sql(query)
//                    .as(Encoders.bean(ResultOrganizations.class));
//
//            result_organizationset
//                    .map(mapResultCommunityFn(organizationMap), Encoders.bean(ResultCommunityList.class))
//                    .filter(Objects::nonNull)
//                    .toJavaRDD()
//                    .mapToPair(value -> new Tuple2<>(value.getResultId(), value))
//                    .reduceByKey((a, b) -> {
//                        ArrayList<String> cl = a.getCommunityList();
//                        b.getCommunityList().stream().forEach(s -> {
//                            if (!cl.contains(s)) {
//                                cl.add(s);
//                            }
//                        });
//                        a.setCommunityList(cl);
//                        return a;
//                    })
//                    .map(value -> OBJECT_MAPPER.writeValueAsString(value._2()))
//                    .saveAsTextFile(outputPath, GzipCodec.class);
	}

	private static MapFunction<ResultOrganizations, ResultCommunityList> mapResultCommunityFn(
		CommunityEntityMap organizationMap) {
		return value -> {
			String rId = value.getResultId();
			Optional<List<String>> orgs = Optional.ofNullable(value.getMerges());
			String oTarget = value.getOrgId();
			Set<String> communitySet = new HashSet<>();
			if (organizationMap.containsKey(oTarget)) {
				communitySet.addAll(organizationMap.get(oTarget));
			}
			if (orgs.isPresent())
				for (String oId : orgs.get()) {
					if (organizationMap.containsKey(oId)) {
						communitySet.addAll(organizationMap.get(oId));
					}
				}
			if (!communitySet.isEmpty()) {
				ResultCommunityList rcl = new ResultCommunityList();
				rcl.setResultId(rId);
				ArrayList<String> communityList = new ArrayList<>();
				communityList.addAll(communitySet);
				rcl.setCommunityList(communityList);
				return rcl;
			}
			return null;
		};
	}
}