package eu.dnetlib.dhp.resulttocommunityfromorganization;

import com.fasterxml.jackson.databind.ObjectMapper;
import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.schema.oaf.*;
import org.apache.commons.io.IOUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.sql.Encoders;
import org.apache.spark.sql.SaveMode;
import org.apache.spark.sql.SparkSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.*;
import java.util.stream.Collectors;

import static eu.dnetlib.dhp.PropagationConstant.*;
import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkHiveSession;

public class SparkResultToCommunityFromOrganizationJob2 {

    private static final Logger log = LoggerFactory.getLogger(SparkResultToCommunityFromOrganizationJob2.class);

    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();


    public static void main(String[] args) throws Exception {
        String jsonConfiguration = IOUtils.toString(SparkResultToCommunityFromOrganizationJob2.class
                .getResourceAsStream("/eu/dnetlib/dhp/resulttocommunityfromorganization/input_communitytoresult_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 String possibleupdatespath = parser.get("preparedInfoPath");
        log.info("preparedInfoPath: {}", possibleupdatespath);

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

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

        Class<? extends Result> resultClazz = (Class<? extends Result>) Class.forName(resultClassName);

        SparkConf conf = new SparkConf();
        conf.set("hive.metastore.uris", parser.get("hive_metastore_uris"));


        runWithSparkHiveSession(conf, isSparkSessionManaged,
                spark -> {
                    if (isTest(parser)) {
                        removeOutputDir(spark, outputPath);
                    }
                    execPropagation(spark, inputPath, outputPath, resultClazz, possibleupdatespath);
                });

    }

    private static <R extends Result> void execPropagation(SparkSession spark, String inputPath, String outputPath,
                                                           Class<R> resultClazz, String possibleUpdatesPath) {
        org.apache.spark.sql.Dataset<ResultCommunityList> possibleUpdates = readResultCommunityList(spark, possibleUpdatesPath);
        org.apache.spark.sql.Dataset<R> result = readPathEntity(spark, inputPath, resultClazz);


        result
                .joinWith(possibleUpdates, result.col("id").equalTo(possibleUpdates.col("resultId")),
                        "left_outer")
                .map(value -> {
                    R ret = value._1();
                    Optional<ResultCommunityList> rcl = Optional.ofNullable(value._2());
                    if(rcl.isPresent()){
                        ArrayList<String> communitySet = rcl.get().getCommunityList();
                        List<String> contextList = ret.getContext().stream().map(con -> con.getId()).collect(Collectors.toList());
                        Result res = new Result();
                        res.setId(ret.getId());
                        List<Context> propagatedContexts = new ArrayList<>();
                        for(String cId:communitySet){
                            if(!contextList.contains(cId)){
                                Context newContext = new Context();
                                newContext.setId(cId);
                                newContext.setDataInfo(Arrays.asList(getDataInfo(PROPAGATION_DATA_INFO_TYPE,
                                        PROPAGATION_RESULT_COMMUNITY_ORGANIZATION_CLASS_ID, PROPAGATION_RESULT_COMMUNITY_ORGANIZATION_CLASS_NAME)));
                                propagatedContexts.add(newContext);
                            }
                        }
                        res.setContext(propagatedContexts);
                        ret.mergeFrom(res);
                    }
                    return ret;
                }, Encoders.bean(resultClazz))
                .toJSON()
                .write()
                .mode(SaveMode.Overwrite)
                .option("compression","gzip")
                .text(outputPath);

    }

    private static org.apache.spark.sql.Dataset<ResultCommunityList> readResultCommunityList(SparkSession spark, String possibleUpdatesPath) {
        return spark
                .read()
                .textFile(possibleUpdatesPath)
                .map(value -> OBJECT_MAPPER.readValue(value, ResultCommunityList.class), Encoders.bean(ResultCommunityList.class));
    }

}