package eu.dnetlib.dhp.actionmanager.bipaffiliations;

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

import java.io.Serializable;
import java.util.stream.Collectors;

import eu.dnetlib.dhp.actionmanager.Constants;
import eu.dnetlib.dhp.actionmanager.bipaffiliations.model.*;
import eu.dnetlib.dhp.actionmanager.ror.GenerateRorActionSetJob;
import eu.dnetlib.dhp.schema.action.AtomicAction;
import eu.dnetlib.dhp.schema.oaf.utils.CleaningFunctions;
import eu.dnetlib.dhp.schema.oaf.utils.IdentifierFactory;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.SequenceFileOutputFormat;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.MapFunction;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.SparkSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.spark.sql.Dataset;

import com.fasterxml.jackson.databind.ObjectMapper;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.schema.common.ModelConstants;
import eu.dnetlib.dhp.schema.oaf.*;
import eu.dnetlib.dhp.schema.oaf.utils.OafMapperUtils;
import scala.Tuple2;

/**
 * Creates action sets for Crossref affiliation relations inferred by BIP!
 */
public class PrepareAffiliationRelations implements Serializable {

    private static final String DOI = "doi";
    private static final Logger log = LoggerFactory.getLogger(PrepareAffiliationRelations.class);
    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
    private static final String ID_PREFIX = "50|doi_________::";
    public static final String BIP_AFFILIATIONS_CLASSID = "result:organization:bipinference";
    public static final String BIP_AFFILIATIONS_CLASSNAME = "Affiliation relation inferred by BIP!";
    public static final String BIP_INFERENCE_PROVENANCE = "bip_affiliation";

    public static <I extends Result> void main(String[] args) throws Exception {

        String jsonConfiguration = IOUtils
            .toString(
                PrepareAffiliationRelations.class
                .getResourceAsStream(
                    "/eu/dnetlib/dhp/actionmanager/bipaffiliations/input_actionset_parameter.json"));

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

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

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

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

        SparkConf conf = new SparkConf();

        runWithSparkSession(
            conf,
            isSparkSessionManaged,
            spark -> {
                Constants.removeOutputDir(spark, outputPath);
                prepareAffiliationRelations(spark, inputPath, outputPath);
            });
    }

    private static <I extends Result> void prepareAffiliationRelations(SparkSession spark, String inputPath, String outputPath) {

        final JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext());

        // load and parse affiliation relations from HDFS
        JavaRDD<AffiliationRelationDeserializer> affiliationRelationsDeserializeRDD = sc
            .textFile(inputPath)
            .map(item -> OBJECT_MAPPER.readValue(item, AffiliationRelationDeserializer.class));

        // convert affiliation to an internal representation
        Dataset<AffiliationRelationModel> affiliationRelations =
            spark.createDataset(
                affiliationRelationsDeserializeRDD.flatMap(entry ->
                    entry.getMatchings().stream().flatMap(matching ->
                    matching.getRorId().stream().map( rorId -> new AffiliationRelationModel(
                        entry.getDoi(),
                        rorId,
                        matching.getConfidence()
                    ))).collect(Collectors.toList())
                    .iterator())
                .rdd(),
                Encoders.bean(AffiliationRelationModel.class));

        // prepare action sets for affiliation relations
        affiliationRelations
            .map((MapFunction<AffiliationRelationModel, Relation>) affRel -> {

                // DOI to OpenAIRE id
                final String paperId = ID_PREFIX + IdentifierFactory.md5(CleaningFunctions.normalizePidValue("doi", affRel.getDoi()));

                // ROR id to OpenAIRE id
                final String affId = GenerateRorActionSetJob.calculateOpenaireId(affRel.getRorId());

                Qualifier qualifier = OafMapperUtils.qualifier(
                    BIP_AFFILIATIONS_CLASSID,
                    BIP_AFFILIATIONS_CLASSNAME,
                    ModelConstants.DNET_PROVENANCE_ACTIONS,
                    ModelConstants.DNET_PROVENANCE_ACTIONS);

                // format data info; setting `confidence` into relation's `trust`
                DataInfo dataInfo = OafMapperUtils.dataInfo(
                   false,
                   BIP_INFERENCE_PROVENANCE,
                   true,
                   false,
                   qualifier,
                   Double.toString(affRel.getConfidence()));

                return OafMapperUtils.getRelation(
                    paperId,
                    affId,
                    ModelConstants.RESULT_ORGANIZATION,
                    ModelConstants.AFFILIATION,
                    ModelConstants.HAS_AUTHOR_INSTITUTION,
                    null,
                    dataInfo,
                    null);

            }, Encoders.bean(Relation.class))
            .toJavaRDD()
            .map(p -> new AtomicAction(Relation.class, p))
            .mapToPair(
                aa -> new Tuple2<>(new Text(aa.getClazz().getCanonicalName()),
                    new Text(OBJECT_MAPPER.writeValueAsString(aa))))
            .saveAsHadoopFile(outputPath, Text.class, Text.class, SequenceFileOutputFormat.class);

    }
}