package eu.dnetlib.pace.util;

import com.google.common.collect.Lists;
import eu.dnetlib.pace.clustering.NGramUtils;
import eu.dnetlib.pace.config.DedupConfig;
import eu.dnetlib.pace.config.WfConfig;
import eu.dnetlib.pace.model.Field;
import eu.dnetlib.pace.model.MapDocument;
import eu.dnetlib.pace.model.MapDocumentComparator;
import eu.dnetlib.pace.tree.JsonListMatch;
import eu.dnetlib.pace.tree.LevensteinTitle;
import eu.dnetlib.pace.tree.SizeMatch;
import eu.dnetlib.pace.tree.TitleVersionMatch;
import eu.dnetlib.pace.tree.support.FieldStats;
import eu.dnetlib.pace.tree.support.TreeProcessor;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.*;

public class BlockProcessorForTesting {

        public static final List<String> accumulators= new ArrayList<>();

        private static final Log log = LogFactory.getLog(eu.dnetlib.pace.util.BlockProcessorForTesting.class);

        private DedupConfig dedupConf;

        public static void constructAccumulator( final DedupConfig dedupConf) {
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), "records per hash key = 1"));
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), "missing " + dedupConf.getWf().getOrderField()));
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), String.format("Skipped records for count(%s) >= %s", dedupConf.getWf().getOrderField(), dedupConf.getWf().getGroupMaxSize())));
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), "skip list"));
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), "dedupSimilarity (x2)"));
            accumulators.add(String.format("%s::%s",dedupConf.getWf().getEntityType(), "d < " + dedupConf.getWf().getThreshold()));
        }

        public BlockProcessorForTesting(DedupConfig dedupConf) {
            this.dedupConf = dedupConf;
        }

        public void processSortedBlock(final String key, final List<MapDocument> documents, final Reporter context, boolean useTree)  {
            if (documents.size() > 1) {
//            log.info("reducing key: '" + key + "' records: " + q.size());
                process(prepare(documents), context, useTree);

            } else {
                context.incrementCounter(dedupConf.getWf().getEntityType(), "records per hash key = 1", 1);
            }
        }

        public void process(final String key, final Iterable<MapDocument> documents, final Reporter context, boolean useTree)  {

            final Queue<MapDocument> q = prepare(documents);

            if (q.size() > 1) {
//            log.info("reducing key: '" + key + "' records: " + q.size());
                process(simplifyQueue(q, key, context), context, useTree);

            } else {
                context.incrementCounter(dedupConf.getWf().getEntityType(), "records per hash key = 1", 1);
            }
        }

        private Queue<MapDocument> prepare(final Iterable<MapDocument> documents) {
            final Queue<MapDocument> queue = new PriorityQueue<>(100, new MapDocumentComparator(dedupConf.getWf().getOrderField()));

            final Set<String> seen = new HashSet<String>();
            final int queueMaxSize = dedupConf.getWf().getQueueMaxSize();

            documents.forEach(doc -> {
                if (queue.size() <= queueMaxSize) {
                    final String id = doc.getIdentifier();

                    if (!seen.contains(id)) {
                        seen.add(id);
                        queue.add(doc);
                    }
                }
            });

            return queue;
        }

        private Queue<MapDocument> simplifyQueue(final Queue<MapDocument> queue, final String ngram, final Reporter context) {
            final Queue<MapDocument> q = new LinkedList<>();

            String fieldRef = "";
            final List<MapDocument> tempResults = Lists.newArrayList();

            while (!queue.isEmpty()) {
                final MapDocument result = queue.remove();

                final String orderFieldName = dedupConf.getWf().getOrderField();
                final Field orderFieldValue = result.values(orderFieldName);
                if (!orderFieldValue.isEmpty()) {
                    final String field = NGramUtils.cleanupForOrdering(orderFieldValue.stringValue());
                    if (field.equals(fieldRef)) {
                        tempResults.add(result);
                    } else {
                        populateSimplifiedQueue(q, tempResults, context, fieldRef, ngram);
                        tempResults.clear();
                        tempResults.add(result);
                        fieldRef = field;
                    }
                } else {
                    context.incrementCounter(dedupConf.getWf().getEntityType(), "missing " + dedupConf.getWf().getOrderField(), 1);
                }
            }
            populateSimplifiedQueue(q, tempResults, context, fieldRef, ngram);

            return q;
        }

        private void populateSimplifiedQueue(final Queue<MapDocument> q,
                                             final List<MapDocument> tempResults,
                                             final Reporter context,
                                             final String fieldRef,
                                             final String ngram) {
            WfConfig wf = dedupConf.getWf();
            if (tempResults.size() < wf.getGroupMaxSize()) {
                q.addAll(tempResults);
            } else {
                context.incrementCounter(wf.getEntityType(), String.format("Skipped records for count(%s) >= %s", wf.getOrderField(), wf.getGroupMaxSize()), tempResults.size());
//            log.info("Skipped field: " + fieldRef + " - size: " + tempResults.size() + " - ngram: " + ngram);
            }
        }

        private void process(final Queue<MapDocument> queue, final Reporter context, boolean useTree)  {

            while (!queue.isEmpty()) {

                final MapDocument pivot = queue.remove();
                final String idPivot = pivot.getIdentifier();

                WfConfig wf = dedupConf.getWf();
                final Field fieldsPivot = pivot.values(wf.getOrderField());
                final String fieldPivot = (fieldsPivot == null) || fieldsPivot.isEmpty() ? "" : fieldsPivot.stringValue();

                if (fieldPivot != null) {
                    int i = 0;
                    for (final MapDocument curr : queue) {
                        final String idCurr = curr.getIdentifier();

                        if (mustSkip(idCurr)) {

                            context.incrementCounter(wf.getEntityType(), "skip list", 1);

                            break;
                        }

                        if (i > wf.getSlidingWindowSize()) {
                            break;
                        }

                        final Field fieldsCurr = curr.values(wf.getOrderField());
                        final String fieldCurr = (fieldsCurr == null) || fieldsCurr.isEmpty() ? null : fieldsCurr.stringValue();

                        if (!idCurr.equals(idPivot) && (fieldCurr != null)) {

//                            if (new TreeProcessor(dedupConf).compare(pivot, curr) == true && publicationCompare(pivot, curr, dedupConf) == false)
//                                emitOutput(true, idPivot, idCurr, context);
//
                            if(useTree)
                                emitOutput(new TreeProcessor(dedupConf).compare(pivot, curr), idPivot, idCurr, context);
                            else
                                emitOutput(publicationCompare(pivot, curr, dedupConf), idPivot, idCurr, context);

                        }
                    }
                }
            }
        }

        private boolean publicationCompare(MapDocument a, MapDocument b, DedupConfig config) {

            double score = 0.0;
            //LAYER 1 - comparison of the PIDs json lists
            Map<String, String> params = new HashMap<>();
            params.put("jpath_value", "$.value");
            params.put("jpath_classid", "$.qualifier.classid");
            JsonListMatch jsonListMatch = new JsonListMatch(params);
            double result = jsonListMatch.compare(a.getFieldMap().get("pid"), b.getFieldMap().get("pid"), config);
            if (result >= 0.5) //if the result of the comparison is greater than the threshold
                score += 10.0;  //high score because it should match when the first condition is satisfied
            else
                score += 0.0;

            //LAYER 2 - comparison of the title version and the size of the authors lists
            TitleVersionMatch titleVersionMatch = new TitleVersionMatch(params);
            double result1 = titleVersionMatch.compare(a.getFieldMap().get("title"), b.getFieldMap().get("title"), config);
            SizeMatch sizeMatch = new SizeMatch(params);
            double result2 = sizeMatch.compare(a.getFieldMap().get("authors"), b.getFieldMap().get("authors"), config);
            if (Math.min(result1, result2) != 0)
                score+=0;
            else
                score-=2;

            //LAYER 3 - computation of levenshtein on titles
            LevensteinTitle levensteinTitle = new LevensteinTitle(params);
            double result3 = levensteinTitle.compare(a.getFieldMap().get("title"), b.getFieldMap().get("title"), config);
            score += Double.isNaN(result3)?0.0:result3;

            return score >= 0.99;
        }

        private void emitOutput(final boolean result, final String idPivot, final String idCurr, final Reporter context)  {

            if (result) {
                writeSimilarity(context, idPivot, idCurr);
                context.incrementCounter(dedupConf.getWf().getEntityType(), "dedupSimilarity (x2)", 1);
            } else {
                context.incrementCounter(dedupConf.getWf().getEntityType(), "d < " + dedupConf.getWf().getThreshold(), 1);
            }
        }

        private boolean mustSkip(final String idPivot) {
            return dedupConf.getWf().getSkipList().contains(getNsPrefix(idPivot));
        }

        private String getNsPrefix(final String id) {
            return StringUtils.substringBetween(id, "|", "::");
        }

        private void writeSimilarity(final Reporter context, final String from, final String to)  {
            final String type = dedupConf.getWf().getEntityType();

            context.emit(type, from, to);
            context.emit(type, to, from);
        }
}