package eu.dnetlib.openaire.community.db;

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.stream.Collectors;

import javax.transaction.Transactional;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.stereotype.Service;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import eu.dnetlib.openaire.community.db.model.DbCommunity;
import eu.dnetlib.openaire.community.db.model.DbDatasource;
import eu.dnetlib.openaire.community.db.model.DbDatasourcePK;
import eu.dnetlib.openaire.community.db.model.DbProject;
import eu.dnetlib.openaire.community.db.model.DbProjectPK;
import eu.dnetlib.openaire.community.db.repository.DbCommunityRepository;
import eu.dnetlib.openaire.community.db.repository.DbDatasourceRepository;
import eu.dnetlib.openaire.community.db.repository.DbOrganizationRepository;
import eu.dnetlib.openaire.community.db.repository.DbProjectRepository;
import eu.dnetlib.openaire.community.db.repository.DbSupportOrgRepository;
import eu.dnetlib.openaire.exporter.exceptions.CommunityException;
import eu.dnetlib.openaire.exporter.exceptions.ResourceNotFoundException;
import eu.dnetlib.openaire.exporter.model.community.CommunityContentprovider;
import eu.dnetlib.openaire.exporter.model.community.CommunityDetails;
import eu.dnetlib.openaire.exporter.model.community.CommunityOpenAIRECommunities;
import eu.dnetlib.openaire.exporter.model.community.CommunityOrganization;
import eu.dnetlib.openaire.exporter.model.community.CommunityProject;
import eu.dnetlib.openaire.exporter.model.community.CommunitySummary;
import eu.dnetlib.openaire.exporter.model.community.CommunityWritableProperties;
import eu.dnetlib.openaire.exporter.model.community.CommunityZenodoCommunity;
import eu.dnetlib.openaire.exporter.model.community.selectioncriteria.SelectionCriteria;

@Service
@ConditionalOnProperty(value = "openaire.exporter.enable.community", havingValue = "true")
public class CommunityService {

	// TODO
	// 1) Aggiungere i campi membership e claim al modello delle api
	// 2) Capire come gestire il campo Id (Integer) di CommunityProject
	// 3) Gestire paginazione dei progetti
	// 4) CommunityContentprovider sono le datasources?
	// 5) Capire come gestire il campo Id (Integer) di CommunityContentprovider
	// 5) Capire come gestire il campo Id (Integer) di CommunityOrganization

	@Autowired
	private DbCommunityRepository dbCommunityRepository;
	@Autowired
	private DbProjectRepository dbProjectRepository;
	@Autowired
	private DbDatasourceRepository dbDatasourceRepository;
	@Autowired
	private DbOrganizationRepository dbOrganizationRepository;
	@Autowired
	private DbSupportOrgRepository dbSupportOrgRepository;

	public List<CommunitySummary> listCommunities() throws CommunityException {
		return dbCommunityRepository.findAll()
			.stream()
			.map(ConvertionUtils::toSummary)
			.collect(Collectors.toList());
	}

	public CommunityDetails getCommunity(final String id) throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
		return null;
	}

	public void setCommunity(final String id, final CommunityWritableProperties details) throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
	}

	public List<CommunityProject> getCommunityProjects(final String id) throws CommunityException, ResourceNotFoundException {
		return dbProjectRepository.findByCommunity(id)
			.stream()
			.map(ConvertionUtils::toCommunityProject)
			.collect(Collectors.toList());
	}

	public CommunityProject addCommunityProject(final String id, final CommunityProject project) throws CommunityException, ResourceNotFoundException {
		final DbProject p = ConvertionUtils.toDbProject(id, project);
		dbProjectRepository.save(p);
		return project;
	}

	public List<CommunityProject> addCommunityProjectList(final String id, final List<CommunityProject> projectList)
		throws CommunityException, ResourceNotFoundException {

		final List<DbProject> list = projectList.stream()
			.map(p -> ConvertionUtils.toDbProject(id, p))
			.collect(Collectors.toList());

		dbProjectRepository.saveAll(list);

		return projectList;
	}

	public void removeCommunityProject(final String id, final String projectId) throws CommunityException, ResourceNotFoundException {
		dbProjectRepository.deleteById(new DbProjectPK(id, projectId));
	}

	public void removeCommunityProjectList(final String id, final List<String> projectIdList) throws CommunityException, ResourceNotFoundException {
		final List<DbProjectPK> list = projectIdList.stream()
			.map(projectId -> new DbProjectPK(id, projectId))
			.collect(Collectors.toList());
		dbProjectRepository.deleteAllById(list);
	}

	public List<CommunityContentprovider> getCommunityContentproviders(final String id) throws CommunityException, ResourceNotFoundException {
		return dbDatasourceRepository.findByCommunity(id)
			.stream()
			.map(ConvertionUtils::toCommunityContentprovider)
			.collect(Collectors.toList());
	}

	public CommunityContentprovider addCommunityContentprovider(final String id, final CommunityContentprovider cp)
		throws CommunityException, ResourceNotFoundException {
		final DbDatasource ds = ConvertionUtils.toDbDatasource(id, cp);
		dbDatasourceRepository.save(ds);
		return cp;
	}

	public List<CommunityContentprovider> addCommunityContentProvidersList(final String id, final List<CommunityContentprovider> contentprovidersList)
		throws CommunityException, ResourceNotFoundException {

		final List<DbDatasource> list = contentprovidersList.stream()
			.map(cp -> ConvertionUtils.toDbDatasource(id, cp))
			.collect(Collectors.toList());

		dbDatasourceRepository.saveAll(list);

		return contentprovidersList;
	}

	public void removeCommunityContentProvider(final String id, final String contentproviderId) throws CommunityException, ResourceNotFoundException {
		dbDatasourceRepository.deleteById(new DbDatasourcePK(id, contentproviderId));
	}

	public void removeCommunityContentProviderList(final String id, final List<String> contentProviderIdList)
		throws CommunityException, ResourceNotFoundException {
		final List<DbDatasourcePK> list = contentProviderIdList.stream()
			.map(dsId -> new DbDatasourcePK(id, dsId))
			.collect(Collectors.toList());
		dbDatasourceRepository.deleteAllById(list);
	}

	public void removeCommunityOrganization(final String id, final String organizationId) throws CommunityException, ResourceNotFoundException {
		dbDatasourceRepository.deleteById(new DbDatasourcePK(id, organizationId));
	}

	public List<CommunityOrganization> getCommunityOrganizations(final String id) throws CommunityException, ResourceNotFoundException {
		return dbOrganizationRepository.findByCommunity(id)
			.stream()
			.map(ConvertionUtils::toCommunityOrganiztion)
			.collect(Collectors.toList());
	}

	@Transactional
	public CommunityDetails addCommunitySubjects(final String id, final List<String> subjects) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, subjects, c -> c.getSubjects(), (c, subs) -> c.setSubjects(subs), false);
	}

	@Transactional
	public CommunityDetails removeCommunitySubjects(final String id, final List<String> subjects) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, subjects, c -> c.getSubjects(), (c, subs) -> c.setSubjects(subs), true);
	}

	@Transactional
	public CommunityDetails addCommunityFOS(final String id, final List<String> foss) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, foss, c -> c.getFos(), (c, fos) -> c.setFos(fos), false);
	}

	@Transactional
	public CommunityDetails removeCommunityFOS(final String id, final List<String> foss) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, foss, c -> c.getFos(), (c, fos) -> c.setFos(fos), true);
	}

	@Transactional
	public CommunityDetails addCommunitySDG(final String id, final List<String> sdgs) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, sdgs, c -> c.getSdg(), (c, sdg) -> c.setSdg(sdg), false);
	}

	@Transactional
	public CommunityDetails removeCommunitySDG(final String id, final List<String> sdgs) throws CommunityException, ResourceNotFoundException {
		return modifyElementToArrayField(id, sdgs, c -> c.getSdg(), (c, sdg) -> c.setSdg(sdg), true);
	}

	public CommunityDetails addCommunityAdvancedConstraint(final String id, final SelectionCriteria advancedCosntraint)
		throws CommunityException, ResourceNotFoundException {

		try {
			final DbCommunity dbEntry = dbCommunityRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("Community not found: " + id));
			dbEntry.setAdvancedConstraints(new ObjectMapper().writeValueAsString(advancedCosntraint));
			dbCommunityRepository.save(dbEntry);
			return getCommunity(id);
		} catch (final JsonProcessingException e) {
			throw new CommunityException("Error converting json");
		}

	}

	public CommunityDetails removeCommunityAdvancedConstraint(final String id) throws ResourceNotFoundException, CommunityException {
		final DbCommunity dbEntry = dbCommunityRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("Community not found: " + id));
		dbEntry.setAdvancedConstraints(null);
		dbCommunityRepository.save(dbEntry);
		return getCommunity(id);
	}

	public List<CommunityZenodoCommunity> getCommunityZenodoCommunities(final String id) throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
		return null;
	}

	public void removeCommunityZenodoCommunity(final String id, final Integer zenodoCommId) throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
	}

	public CommunityZenodoCommunity addCommunityZenodoCommunity(final String id, final CommunityZenodoCommunity zc)
		throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
		return null;
	}

	public CommunityOpenAIRECommunities getOpenAIRECommunities(final String zenodoId) throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
		return null;
	}

	public CommunityOrganization addCommunityOrganization(final String id, final CommunityOrganization organization)
		throws CommunityException, ResourceNotFoundException {
		// TODO Auto-generated method stub
		return null;
	}

	private CommunityDetails modifyElementToArrayField(final String id,
		final List<String> values,
		final Function<DbCommunity, String[]> getter,
		final BiConsumer<DbCommunity, String[]> setter,
		final boolean remove) throws ResourceNotFoundException, CommunityException {

		final DbCommunity dbEntry = dbCommunityRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("Community not found: " + id));

		final Set<String> tmpList = new LinkedHashSet<>();
		final String[] oldValues = getter.apply(dbEntry);
		if (oldValues != null) {
			for (final String s : oldValues) {
				tmpList.add(s);
			}
		}
		if (remove) {
			tmpList.removeAll(values);
		} else {
			tmpList.addAll(values);
		}

		setter.accept(dbEntry, tmpList.toArray(new String[tmpList.size()]));

		dbCommunityRepository.save(dbEntry);

		return getCommunity(id);
	}

}