D-Net

package eu.dnetlib.data.dedup;

import java.io.IOException;

import java.util.*;

import java.util.stream.Collectors;

import javax.annotation.Resource;

import com.google.common.base.Function;

import com.google.common.base.Joiner;

import com.google.common.base.Splitter;

import com.google.common.collect.Iterables;

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

import com.google.common.collect.Sets;

import eu.dnetlib.data.mapreduce.util.OafDecoder;

import eu.dnetlib.data.mapreduce.util.OafEntityDecoder;

import eu.dnetlib.data.proto.OafProtos.Oaf;

import eu.dnetlib.data.transform.OafEntityMerger;

import eu.dnetlib.data.transform.SolrProtoMapper;

import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpDocumentNotFoundException;

import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpException;

import eu.dnetlib.enabling.is.lookup.rmi.ISLookUpService;

import eu.dnetlib.enabling.locators.UniqueServiceLocator;

import eu.dnetlib.functionality.index.client.IndexClient;

import eu.dnetlib.functionality.index.client.IndexClientException;

import eu.dnetlib.functionality.index.client.response.LookupResponse;

import eu.dnetlib.functionality.index.client.solr.SolrIndexClient;

import eu.dnetlib.functionality.index.client.solr.SolrIndexClientFactory;

import eu.dnetlib.functionality.modular.ui.dedup.SimilarityGroup;

import eu.dnetlib.pace.config.DedupConfig;

import org.apache.commons.codec.binary.Base64;

import org.apache.commons.lang.StringUtils;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.apache.solr.common.SolrInputDocument;

import org.dom4j.DocumentException;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

public class DedupIndexDAO {

	private static final Log log = LogFactory.getLog(DedupIndexDAO.class);

	private static final String ID_PREFIX_REGEX = "^\\d\\d\\|";

	private static final Map<String, Map<String, String>> paths = Maps.newHashMap();

	static {

		paths.put("result", new HashMap<>());

		paths.put("organization", new HashMap<>());

		paths.put("person", new HashMap<>());

		paths.get("result").put("provenance", "collectedfrom/value");

		paths.get("organization").put("provenance", "collectedfrom/value");

		paths.get("person").put("provenance", "collectedfrom/value");

		paths.get("result").put("title", "result/metadata/title/value");

		paths.get("result").put("dateofacceptance", "result/metadata/dateofacceptance/value");

		paths.get("result").put("description", "result/metadata/description/value");

		paths.get("result").put("author", "result/metadata/author/fullname");

		paths.get("organization").put("legalname", "organization/metadata/legalname/value");

		paths.get("organization").put("legalshortname", "organization/metadata/legalshortname/value");

		paths.get("organization").put("websiteurl", "organization/metadata/websiteurl/value");

		paths.get("organization").put("country", "organization/metadata/country/classid");

		paths.get("person").put("fullname", "person/metadata/fullname/value");

	}

	@Resource

	private UniqueServiceLocator serviceLocator;

	/**

	 * The index client factory.

	 */

	@Autowired

	private SolrIndexClientFactory indexClientFactory;

	private IndexClient indexClient = null;

	@Value("${dnet.dedup.index.collection}")

	private String dedupIndexCollection;

	public OafResult search(final String type, final String userQuery, final String actionSet, final int start, final int rows, final String fields)

			throws Exception {

		final String cqlQuery =

				String.format("(>s=SOLR s.q.op=AND) and oaftype = %s and actionset exact \"%s\" and deletedbyinference = false and %s", type, actionSet,

						userQuery);

		final LookupResponse rsp = getIndexClient().lookup(cqlQuery, null, start, (start + rows) - 1);

		final List<String> fieldList = Lists.newLinkedList(Splitter.on(",").omitEmptyStrings().trimResults().split(fields));

		final List<Map<String, String>> resList = Lists.newLinkedList(Iterables.transform(toOaf(rsp), getOaf2FieldMapFunction(type, fieldList)));

		return new OafResult(rsp.getTotal(), resList);

	}

	public OafResult searchById(final String actionSet, final String type, final String objidentifier, final List<String> fields) throws Exception {

		final String cqlQuery = "objidentifier exact \"" + objidentifier + "\" and actionset exact \"" + actionSet + "\"";

		final LookupResponse rsp = getIndexClient().lookup(cqlQuery, null, 0, 1);

		final Iterable<Oaf> oafList = toOaf(rsp);

		final List<Map<String, String>> resList = Lists.newLinkedList(Iterables.transform(oafList, getOaf2FieldMapFunction(type, fields)));

		return new OafResult(rsp.getTotal(), resList);

	}

	public boolean commit(final SimilarityGroup group) throws Exception {

		int commitStatus = 0;

		int addStatus = 0;

		log.info("starting index update");

		try(final SolrIndexClient indexClient = (SolrIndexClient) getIndexClient()) {

			final SolrProtoMapper mapper = initProtoMapper();

			final Function<Oaf, SolrInputDocument> oaf2solr = oaf2solr(group, mapper);

			final List<SolrInputDocument> buffer = Lists.newLinkedList();

			// mark as deleted all the documents in the group

			final List<Oaf> groupDocs = markDeleted(asOafBuilder(parseBase64(queryIndex(group.getGroup(), group.getActionSet()))));

			buffer.addAll(asIndexDocs(oaf2solr, groupDocs));

			// elect a new representative

			final SolrInputDocument newRoot = oaf2solr.apply(OafEntityMerger.merge(getDedupConf(group), newRootId(group), groupDocs).build());

			final String newRootId = (String) newRoot.getFieldValue("objidentifier");

			// newRoot.setField("actionset", dedupConf.getWf().getConfigurationId());

			buffer.add(newRoot);

			// mark as non deleted the documents taken away from the group

			final List<Oaf> dissimDocs = markUnDeleted(asOafBuilder(parseBase64(queryIndex(unique(group.getDissimilar()), group.getActionSet()))));

			buffer.addAll(asIndexDocs(oaf2solr, dissimDocs));

			log.debug(String.format("adding %d documents to index %s", buffer.size(), dedupIndexCollection));

			// add the changes to the server

			addStatus = indexClient.feed(buffer);

			log.debug("solr add status: " + addStatus);

			// delete the old representatives, avoiding to remove the current one (if it didn't change)

			log.debug(String.format("deleting %d documents from index %s", group.getRootIds().size(), dedupIndexCollection));

			for (final String rootId : Iterables.filter(group.getRootIds(), rootId -> !rootId.equals(newRootId))) {

				indexClient.remove(String.format("objidentifier:\"%s\"", mapper.getRecordId(rootId, group.getActionSet())));

			}

			commitStatus = indexClient.commit().getStatus();

			log.debug("solr commit status: " + commitStatus);

		}

		return (addStatus == 0) && (commitStatus == 0);

	}

	private Iterable<Oaf> toOaf(final LookupResponse rsp) {

		return Iterables.transform(rsp.getRecords(), getXml2OafFunction());

	}

	private Iterable<Oaf> parseBase64(final Iterable<String> r) {

		return Iterables.transform(r, getXml2OafFunction());

	}

	private Function<String, Oaf> getXml2OafFunction() {

		return s -> {

			// final String base64 = s.replaceAll("<record.*>", "").replace("</record>", "");

			final String base64 = StringUtils.substringBefore(StringUtils.substringAfter(s, ">"), "<");

			try {

				final byte[] oafBytes = Base64.decodeBase64(base64);

				final Oaf oaf = OafDecoder.decode(oafBytes).getOaf();

				return oaf;

			} catch (final Throwable e) {

				throw new IllegalArgumentException("unable to decode base64 encoded Oaf object: " + base64);

			}

		};

	}

	private SolrProtoMapper initProtoMapper() throws DocumentException, ISLookUpException, ISLookUpDocumentNotFoundException {

		return new SolrProtoMapper(

				serviceLocator

						.getService(ISLookUpService.class)

						.getResourceProfileByQuery(

								"collection('')//RESOURCE_PROFILE["

										+ ".//RESOURCE_TYPE/@value = 'MDFormatDSResourceType' and "

										+ ".//NAME='OPENAIRE']//LAYOUT[@name='index']/FIELDS"));

	}

	private String getResourceProfileByQuery(final String xquery) throws ISLookUpException {

		log.debug("quering for service property: " + xquery);

		final String res = serviceLocator.getService(ISLookUpService.class).getResourceProfileByQuery(xquery);

		if (StringUtils.isBlank(res)) throw new IllegalStateException("unable to find unique service property, xquery: " + xquery);

		return res;

	}

	private Function<Oaf, Map<String, String>> getOaf2FieldMapFunction(final String type, final List<String> fields) {

		return oaf -> {

			final OafEntityDecoder ed = OafDecoder.decode(oaf).decodeEntity();

			final Map<String, String> res = Maps.newHashMap();

			final String oafId = cleanId(oaf.getEntity().getId());

			final List<String> idList = oaf.getEntity().getChildrenList().stream()

					.map(e -> e.getId())

					.map(s -> cleanId(s))

					.collect(Collectors.toList());

			if (idList.isEmpty()) {

				idList.add(oafId);

			}

			res.put("id", oafId);

			res.put("idList", Joiner.on(",").join(idList));

			res.put("groupSize", idList.isEmpty() ? "1" : idList.size() + "");

			for (final String fieldName : fields) {

				res.put(fieldName, Joiner.on("; ").skipNulls().join(ed.getFieldValues(paths.get(type).get(fieldName))));

			}

			return res;

		};

	}

	private String cleanId(final String id) {

		return id.replaceFirst(ID_PREFIX_REGEX, "");

	}

	private IndexClient getIndexClient() throws IndexClientException, ISLookUpDocumentNotFoundException, ISLookUpException {

		if (indexClient == null) {

			indexClient = indexClientFactory.getClient(dedupIndexCollection);

		}

		return indexClient;

	}

	private Iterable<String> queryIndex(final Iterable<String> ids, final String actionset) {

		return Iterables.transform(ids, id -> {

			try {

				final String cql = "objidentifier exact \"" + id + "\" and actionset exact \"" + actionset + "\"";

				final LookupResponse rsp = getIndexClient().lookup(cql, null, 0, 1);

				log.debug(String.format("query index for id '%s', found '%d'", id, rsp.getTotal()));

				return Iterables.getOnlyElement(rsp.getRecords());

			} catch (final Throwable e) {

				log.error(e);

				throw new RuntimeException("unable to query id: " + id, e);

			}

		});

	}

	private List<Oaf> markDeleted(final Iterable<Oaf.Builder> builders) {

		return Lists.newArrayList(Iterables.transform(builders, builder -> {

			// TODO add more changes to the Oaf object here as needed.

			builder.getDataInfoBuilder().setDeletedbyinference(true);

			return builder.build();

		}));

	}

	private List<Oaf> markUnDeleted(final Iterable<Oaf.Builder> builders) {

		return Lists.newArrayList(Iterables.transform(builders, builder -> {

			// TODO add more changes to the Oaf object here as needed.

			builder.getDataInfoBuilder().setDeletedbyinference(false);

			return builder.build();

		}));

	}

	private Iterable<Oaf.Builder> asOafBuilder(final Iterable<Oaf> oaf) {

		return Iterables.transform(oaf, oaf1 -> Oaf.newBuilder(oaf1));

	}

	private String newRootId(final SimilarityGroup group) {

		return "dedup_wf_001::" + Collections.min(group.getGroup()).replaceFirst("^.*::", "");

		// else return Collections.min(group.getRootIds());

	}

	private List<SolrInputDocument> asIndexDocs(final Function<Oaf, SolrInputDocument> mapper, final Iterable<Oaf> protos) {

		return Lists.newArrayList(Iterables.transform(protos, mapper));

	}

	private Function<Oaf, SolrInputDocument> oaf2solr(final SimilarityGroup group, final SolrProtoMapper mapper) {

		return oaf -> {

			try {

				return mapper.map(oaf, group.getDate(), "", group.getActionSet());

			} catch (final Throwable e) {

				throw new IllegalArgumentException("unable to map proto to index document", e);

			}

		};

	}

	private Set<String> unique(final Map<String, Set<String>> map) {

		final Set<String> res = Sets.newHashSet();

		for (final Set<String> ids : map.values()) {

			res.addAll(ids);

		}

		return res;

	}

	private DedupConfig getDedupConf(final SimilarityGroup group) throws IOException {

		final Map<String, String> config = Maps.newHashMap();

		config.put("entityType", group.getEntityType().getType());

		config.put("configurationId", group.getActionSet());

		final DedupConfig dedupConf = DedupConfig.loadDefault(config);

		return dedupConf;

	}

}