package eu.dnetlib.openaire.community.importer;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.transaction.Transactional;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.DocumentHelper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.Lists;

import eu.dnetlib.openaire.community.CommunityService;
import eu.dnetlib.openaire.community.model.DbOrganization;
import eu.dnetlib.openaire.community.repository.DbOrganizationRepository;
import eu.dnetlib.openaire.exporter.exceptions.CommunityException;
import eu.dnetlib.openaire.exporter.model.community.CommunityClaimType;
import eu.dnetlib.openaire.exporter.model.community.CommunityContentprovider;
import eu.dnetlib.openaire.exporter.model.community.CommunityDetails;
import eu.dnetlib.openaire.exporter.model.community.CommunityMembershipType;
import eu.dnetlib.openaire.exporter.model.community.CommunityOrganization;
import eu.dnetlib.openaire.exporter.model.community.CommunityProject;
import eu.dnetlib.openaire.exporter.model.community.CommunityStatus;
import eu.dnetlib.openaire.exporter.model.community.CommunityType;
import eu.dnetlib.openaire.exporter.model.community.SubCommunity;
import eu.dnetlib.openaire.exporter.model.community.selectioncriteria.SelectionCriteria;
import eu.dnetlib.openaire.exporter.model.context.Category;
import eu.dnetlib.openaire.exporter.model.context.Concept;
import eu.dnetlib.openaire.exporter.model.context.Context;
import eu.dnetlib.openaire.exporter.model.context.Param;

@Service
public class CommunityImporterService {

	private final static String pattern = "yyyy-MM-dd'T'hh:mm:ss";

	// common
	private final static String OPENAIRE_ID = "openaireId";
	private final static String PIPE_SEPARATOR = "||";
	private final static String ID_SEPARATOR = "::";
	private final static String CSV_DELIMITER = ",";
	private final static String CLABEL = "label";

	// id suffixes
	private final static String PROJECTS_ID_SUFFIX = ID_SEPARATOR + "projects";
	private final static String CONTENTPROVIDERS_ID_SUFFIX = ID_SEPARATOR + "contentproviders";
	private final static String ZENODOCOMMUNITY_ID_SUFFIX = ID_SEPARATOR + "zenodocommunities";
	private final static String ORGANIZATION_ID_SUFFIX = ID_SEPARATOR + "organizations";

	// community summary
	private final static String CSUMMARY_DESCRIPTION = "description";
	private final static String CSUMMARY_LOGOURL = "logourl";
	private final static String CSUMMARY_STATUS = "status";
	private final static String CSUMMARY_NAME = "name";
	private final static String CSUMMARY_MANAGER = "manager";
	private final static String CSUMMARY_ZENODOC = "zenodoCommunity";

	// community profile
	private final static String CPROFILE_SUBJECT = "subject";
	private final static String CPROFILE_CREATIONDATE = "creationdate";
	private final static String CPROFILE_FOS = "fos";
	private final static String CPROFILE_SDG = "sdg";
	private final static String CPROFILE_ADVANCED_CONSTRAINT = "advancedConstraints";
	private final static String CPROFILE_REMOVE_CONSTRAINT = "removeConstraints";

	// community project
	private final static String CPROJECT_FUNDER = "funder";
	private final static String CPROJECT_NUMBER = "CD_PROJECT_NUMBER";
	private final static String CPROJECT_FULLNAME = "projectfullname";
	private final static String CPROJECT_ACRONYM = "acronym";

	// community content provider
	private final static String CCONTENTPROVIDER_NAME = "name";
	private final static String CCONTENTPROVIDER_OFFICIALNAME = "officialname";
	private final static String CCONTENTPROVIDER_ENABLED = "enabled";
	private final static String CCONTENTPROVIDERENABLED_DEFAULT = "true";
	private final static String CCONTENTPROVIDER_SELCRITERIA = "selcriteria";

	// community zenodo community
	private final static String CZENODOCOMMUNITY_ID = "zenodoid";

	// community organization
	private final static String CORGANIZATION_NAME = "name";
	private final static String CORGANIZATION_LOGOURL = "logourl";
	private final static String CORGANIZATION_WEBSITEURL = "websiteurl";

	@Autowired
	private DbOrganizationRepository dbOrganizationRepository;

	@Autowired
	private CommunityService service;

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

	@Transactional
	public List<DbOrganization> importPropagationOrganizationsFromProfile(final String xml, final boolean simulation) throws Exception {
		final String json = DocumentHelper.parseText(xml)
			.selectSingleNode("//NODE[@name='setPropagationOrganizationCommunityMap']//PARAM[@name='parameterValue']")
			.getText();

		final List<DbOrganization> list = new ObjectMapper()
			.readValue(json, new TypeReference<Map<String, List<String>>>() {})
			.entrySet()
			.stream()
			.flatMap(e -> e.getValue().stream().map(community -> new DbOrganization(community, e.getKey())))
			.collect(Collectors.toList());

		if (!simulation) {
			dbOrganizationRepository.saveAll(list);
		}

		return list;
	}

	@Transactional
	public void importCommunity(final Context context) {
		try {

			final CommunityDetails community = asCommunityDetails(context);

			final List<CommunityContentprovider> datasources =
				getCommunityInfo(context, CONTENTPROVIDERS_ID_SUFFIX, c -> asCommunityDataprovider(context.getId(), c));

			// TODO: REMOVE THIS FILTER ?
			final List<CommunityProject> projects =
				getCommunityInfo(context, PROJECTS_ID_SUFFIX, c -> asCommunityProject(context.getId(), c))
					.stream()
					.filter(p -> p.getOpenaireId() != null)
					.collect(Collectors.toList());

			final List<CommunityOrganization> orgs =
				getCommunityInfo(context, ORGANIZATION_ID_SUFFIX, c -> asCommunityOrganization(context.getId(), c));

			final List<String> otherZenodoCimmunities =
				getCommunityInfo(context, ZENODOCOMMUNITY_ID_SUFFIX, c -> asZenodoCommunity(c));

			community.setOtherZenodoCommunities(otherZenodoCimmunities);

			final List<SubCommunity> subs = context.getCategories()
				.entrySet()
				.stream()
				.filter(e -> !e.getKey().equals(context.getId() + CONTENTPROVIDERS_ID_SUFFIX))
				.filter(e -> !e.getKey().equals(context.getId() + PROJECTS_ID_SUFFIX))
				.filter(e -> !e.getKey().equals(context.getId() + ORGANIZATION_ID_SUFFIX))
				.filter(e -> !e.getKey().equals(context.getId() + ZENODOCOMMUNITY_ID_SUFFIX))
				.map(e -> e.getValue())
				.map(cat -> asSubCommunities(context.getId(), null, cat.getLabel(), cat.getConcepts()))
				.flatMap(List::stream)
				.collect(Collectors.toList());

			service.saveCommunity(community);
			service.addCommunityProjectList(context.getId(), projects);
			service.addCommunityContentProvidersList(context.getId(), datasources);
			service.addCommunityOrganizationList(context.getId(), orgs);
			service.addSubCommunityList(subs);
		} catch (final Exception e) {
			throw new RuntimeException("Error importing community: " + context.getId(), e);
		}
	}

	private <R> List<R> getCommunityInfo(final Context context, final String idSuffix, final Function<Concept, R> mapping)
		throws CommunityException {
		if (context != null) {
			final Map<String, Category> categories = context.getCategories();
			final Category category = categories.get(context.getId() + idSuffix);
			if (category != null) { return category.getConcepts()
				.stream()
				.map(mapping)
				.collect(Collectors.toList()); }
		}
		return Lists.newArrayList();
	}

	private static CommunityDetails asCommunityDetails(final Context c) {

		final CommunityDetails details = new CommunityDetails();

		details.setId(c.getId());
		details.setShortName(c.getLabel());
		details.setLastUpdateDate(convertToLocalDateTime(c.getLastUpdateDate()));
		details.setCreationDate(convertToLocalDateTime(c.getCreationDate()));
		details.setQueryId(c.getId() + PIPE_SEPARATOR + c.getLabel());
		details.setType(CommunityType.valueOf(c.getType()));
		details.setMembership(CommunityMembershipType.open);
		details.setClaim(CommunityClaimType.all);

		final Map<String, List<Param>> params = c.getParams();
		if (params.containsKey(CSUMMARY_DESCRIPTION)) {
			details.setDescription(asCsv(params.get(CSUMMARY_DESCRIPTION)));
		}
		if (params.containsKey(CSUMMARY_LOGOURL)) {
			details.setLogoUrl(asCsv(params.get(CSUMMARY_LOGOURL)));
		}
		if (params.containsKey(CSUMMARY_STATUS)) {
			details.setStatus(CommunityStatus.valueOf(firstValue(params, CSUMMARY_STATUS)));
		}
		if (params.containsKey(CSUMMARY_NAME)) {
			details.setName(asCsv(params.get(CSUMMARY_NAME)));
		} else {
			details.setName(c.getLabel());
		}
		if (params.containsKey(CSUMMARY_ZENODOC)) {
			details.setZenodoCommunity(asCsv(params.get(CSUMMARY_ZENODOC)));
		}
		if (params.containsKey(CPROFILE_SUBJECT)) {
			details.setSubjects(splitValues(asValues(params.get(CPROFILE_SUBJECT)), CSV_DELIMITER));
		}
		if (params.containsKey(CPROFILE_FOS)) {
			details.setFos(splitValues(asValues(params.get(CPROFILE_FOS)), CSV_DELIMITER));
		}
		if (params.containsKey(CPROFILE_SDG)) {
			details.setSdg(splitValues(asValues(params.get(CPROFILE_SDG)), CSV_DELIMITER));
		}
		if (params.containsKey(CPROFILE_ADVANCED_CONSTRAINT)) {
			// In the map the string is the serialization of the json representing the selection criteria so it is a valid json
			details.setAdvancedConstraints(SelectionCriteria.fromJson(asCsv(params.get(CPROFILE_ADVANCED_CONSTRAINT))));
		}
		if (params.containsKey(CPROFILE_REMOVE_CONSTRAINT)) {
			// In the map the string is the serialization of the json representing the selection criteria so it is a valid json
			details.setRemoveConstraints(SelectionCriteria.fromJson(asCsv(params.get(CPROFILE_REMOVE_CONSTRAINT))));
		}
		if (params.containsKey(CPROFILE_CREATIONDATE)) {
			try {
				final Date d = org.apache.commons.lang3.time.DateUtils.parseDate(asCsv(params.get(CPROFILE_CREATIONDATE)), pattern);
				details.setCreationDate(convertToLocalDateTime(d));
			} catch (final Exception e) {
				log.debug("Exception on date format: " + e.getMessage());
			}
		}

		return details;
	}

	private static CommunityProject asCommunityProject(final String communityId, final Concept c) {
		final Map<String, List<Param>> p = c.getParams();
		final CommunityProject project = new CommunityProject();
		project.setCommunityId(communityId);
		project.setOpenaireId(firstValue(p, OPENAIRE_ID));
		project.setFunder(firstValue(p, CPROJECT_FUNDER));
		project.setGrantId(firstValue(p, CPROJECT_NUMBER));
		project.setName(firstValue(p, CPROJECT_FULLNAME));
		project.setAcronym(firstValue(p, CPROJECT_ACRONYM));
		return project;
	}

	private static CommunityContentprovider asCommunityDataprovider(final String communityId, final Concept c) {
		final Map<String, List<Param>> p = c.getParams();
		final CommunityContentprovider d = new CommunityContentprovider();
		d.setCommunityId(communityId);
		d.setOpenaireId(firstValue(p, OPENAIRE_ID));
		d.setName(firstValue(p, CCONTENTPROVIDER_NAME));
		d.setOfficialname(firstValue(p, CCONTENTPROVIDER_OFFICIALNAME));
		d.setSelectioncriteria(SelectionCriteria.fromJson(firstValue(p, CCONTENTPROVIDER_SELCRITERIA)));
		return d;
	}

	private static CommunityOrganization asCommunityOrganization(final String id, final Concept c) {
		final Map<String, List<Param>> p = c.getParams();
		final CommunityOrganization o = new CommunityOrganization();
		o.setCommunityId(id);
		// o.setId(StringUtils.substringAfterLast(c.getId(), ID_SEPARATOR));
		o.setName(firstValue(p, CORGANIZATION_NAME));
		o.setLogo_url(getDecodedUrl(firstValue(p, CORGANIZATION_LOGOURL)));
		o.setWebsite_url(getDecodedUrl(firstValue(p, CORGANIZATION_WEBSITEURL)));
		return o;
	}

	private static String asZenodoCommunity(final Concept c) {
		return firstValue(c.getParams(), CZENODOCOMMUNITY_ID);
	}

	private static List<SubCommunity> asSubCommunities(final String communityId, final String parent, final String category, final List<Concept> concepts) {
		final List<SubCommunity> list = new ArrayList<>();
		for (final Concept c : concepts) {
			final SubCommunity sc = new SubCommunity();
			sc.setSubCommunityId(c.getId());
			sc.setCommunityId(communityId);
			sc.setParent(parent);
			sc.setCategory(category);
			sc.setLabel(c.getLabel());
			sc.setParams(c.getParams());
			sc.setClaim(c.isClaim());
			list.add(sc);
			list.addAll(asSubCommunities(communityId, c.getId(), category, c.getConcepts()));
		}
		return list;
	}

	private static String getDecodedUrl(final String encoded_url) {
		if (encoded_url == null) { return encoded_url; }
		return new String(Base64.getDecoder().decode(encoded_url));
	}

	private static List<String> splitValues(final Stream<String> stream, final String separator) {
		return stream.map(s -> s.split(separator))
			.map(Arrays::asList)
			.flatMap(List::stream)
			.filter(StringUtils::isNotBlank)
			.map(StringUtils::trim)
			.collect(Collectors.toList());
	}

	private static String firstValue(final Map<String, List<Param>> p, final String paramName) {
		return asValues(p.get(paramName)).findFirst().orElse(null);
	}

	private static String asCsv(final List<Param> params) {
		return asValues(params)
			.collect(Collectors.joining(CSV_DELIMITER));
	}

	private static Stream<String> asValues(final List<Param> params) {
		return params == null ? Stream.empty()
			: params.stream()
				.map(Param::getValue)
				.map(StringUtils::trim)
				.distinct();
	}

	private static LocalDateTime convertToLocalDateTime(final Date date) {
		return date.toInstant()
			.atZone(ZoneId.systemDefault())
			.toLocalDateTime();
	}

	protected DbOrganizationRepository getDbOrganizationRepository() {
		return dbOrganizationRepository;
	}

	protected void setDbOrganizationRepository(final DbOrganizationRepository dbOrganizationRepository) {
		this.dbOrganizationRepository = dbOrganizationRepository;
	}

	protected CommunityService getService() {
		return service;
	}

	protected void setService(final CommunityService service) {
		this.service = service;
	}
}