package eu.dnetlib.organizations.controller;

import java.io.IOException;
import java.time.OffsetDateTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.stream.Stream;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.security.core.Authentication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import eu.dnetlib.common.controller.AbstractDnetController;
import eu.dnetlib.organizations.model.JournalEntry;
import eu.dnetlib.organizations.model.Note;
import eu.dnetlib.organizations.model.OpenaireDuplicate;
import eu.dnetlib.organizations.model.utils.BrowseEntry;
import eu.dnetlib.organizations.model.utils.OrganizationConflict;
import eu.dnetlib.organizations.model.view.ConflictGroupView;
import eu.dnetlib.organizations.model.view.DuplicateGroupView;
import eu.dnetlib.organizations.model.view.OpenaireDuplicateView;
import eu.dnetlib.organizations.model.view.OrganizationInfoView;
import eu.dnetlib.organizations.model.view.OrganizationSimpleView;
import eu.dnetlib.organizations.model.view.OrganizationView;
import eu.dnetlib.organizations.repository.JournalEntryRepository;
import eu.dnetlib.organizations.repository.NoteRepository;
import eu.dnetlib.organizations.repository.UserCountryRepository;
import eu.dnetlib.organizations.repository.readonly.ConflictGroupViewRepository;
import eu.dnetlib.organizations.repository.readonly.DuplicateGroupViewRepository;
import eu.dnetlib.organizations.repository.readonly.OpenaireDuplicateViewRepository;
import eu.dnetlib.organizations.repository.readonly.OrganizationInfoViewRepository;
import eu.dnetlib.organizations.repository.readonly.OrganizationSimpleViewRepository;
import eu.dnetlib.organizations.repository.readonly.OrganizationViewRepository;
import eu.dnetlib.organizations.repository.readonly.SuggestionInfoViewByCountryRepository;
import eu.dnetlib.organizations.utils.CSVConverter;
import eu.dnetlib.organizations.utils.DatabaseUtils;
import eu.dnetlib.organizations.utils.OrganizationStatus;

@RestController
@RequestMapping("/api/organizations")
public class OrganizationController extends AbstractDnetController {

	private static final String SPECIAL_STATUS_FOR_CANDIDATE_DUP = "candidate_dup";

	@Autowired
	private OrganizationViewRepository organizationViewRepository;
	@Autowired
	private OrganizationInfoViewRepository organizationInfoViewRepository;
	@Autowired
	private OrganizationSimpleViewRepository organizationSimpleViewRepository;
	@Autowired
	private OpenaireDuplicateViewRepository openaireDuplicateViewRepository;
	@Autowired
	private ConflictGroupViewRepository conflictGroupViewRepository;
	@Autowired
	private SuggestionInfoViewByCountryRepository suggestionInfoViewByCountryRepository;
	@Autowired
	private UserCountryRepository userCountryRepository;
	@Autowired
	private DuplicateGroupViewRepository duplicateGroupViewRepository;
	@Autowired
	private NoteRepository noteRepository;
	@Autowired
	private JournalEntryRepository journalEntryRepository;
	@Autowired
	private DatabaseUtils databaseUtils;

	@PostMapping("/save")
	public List<String> save(@RequestBody final OrganizationView org, final Authentication authentication) {

		if (StringUtils.isBlank(org.getName())) {
			throw new RuntimeException("Missing field: name");
		} else if (StringUtils.isBlank(org.getCountry())) {
			throw new RuntimeException("Missing field: country");
		} else if (StringUtils.isBlank(org.getType())) {
			throw new RuntimeException("Missing field: type");
		} else if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(org.getCountry(), UserInfo.getEmail(authentication))) {
				final String orgId =
					databaseUtils.insertOrUpdateOrganization(org, UserInfo.getEmail(authentication), UserInfo.isSimpleUser(authentication));
				return Arrays.asList(orgId);
			} else {
				throw new RuntimeException("User not authorized");
			}
	}

	@GetMapping("/info")
	public OrganizationInfoView infoById(@RequestParam final String id, final Authentication authentication) {
		return organizationInfoViewRepository.findById(id).get();
	}

	@GetMapping("/suggestionsInfo")
	public SuggestionInfo suggestionsInfo(final Authentication authentication) {
		final SuggestionInfo info = new SuggestionInfo();

		if (UserInfo.isSuperAdmin(authentication)) {
			suggestionInfoViewByCountryRepository.findAll().forEach(info::add);
		} else if (UserInfo.isSimpleUser(authentication) || UserInfo.isNationalAdmin(authentication)) {
			userCountryRepository.getCountriesForUser(UserInfo.getEmail(authentication))
				.stream()
				.map(suggestionInfoViewByCountryRepository::findById)
				.filter(Optional::isPresent)
				.map(Optional::get)
				.forEach(info::add);
		}
		return info;
	}

	@GetMapping("/get")
	public OrganizationView findById(@RequestParam final String id, final Authentication authentication) {
		final OrganizationView org = organizationViewRepository.findById(id).get();

		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(org.getCountry(), UserInfo.getEmail(authentication))) {
			return org;
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping("/conflicts")
	public List<OrganizationConflict> conflicts(@RequestParam final String id, final Authentication authentication) {
		if (UserInfo.isSuperAdmin(authentication) || userCountryRepository.verifyAuthorizationForId(id, UserInfo.getEmail(authentication))) {
			return databaseUtils.listConflictsForId(id);
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping("/duplicates")
	public List<OpenaireDuplicateView> duplicates(@RequestParam final String id, final Authentication authentication) {
		if (UserInfo.isSuperAdmin(authentication) || userCountryRepository.verifyAuthorizationForId(id, UserInfo.getEmail(authentication))) {
			return listDuplicates(id);
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	private List<OpenaireDuplicateView> listDuplicates(final String id) {
		return openaireDuplicateViewRepository.findByLocalId(id);
	}

	@GetMapping("/conflicts/byCountry/{country}")
	public Collection<Set<OrganizationConflict>> findConflictsByCountry(@PathVariable final String country, final Authentication authentication) {

		if (UserInfo.isSuperAdmin(authentication)) {
			return groupConflicts(conflictGroupViewRepository.findByCountry1OrCountry2(country, country).stream());
		} else if (UserInfo.isSimpleUser(authentication) || UserInfo.isNationalAdmin(authentication)) {
			final Stream<ConflictGroupView> list = userCountryRepository.getCountriesForUser(UserInfo.getEmail(authentication))
				.stream()
				.filter(country::equalsIgnoreCase)
				.map(c -> conflictGroupViewRepository.findByCountry1OrCountry2(c, c).stream())
				.findFirst()
				.orElse(Stream.empty());
			return groupConflicts(list);
		} else {
			throw new RuntimeException("User not authorized");
		}

	}

	@GetMapping("/duplicates/byCountry/{country}")
	public Iterable<DuplicateGroupView> findDuplicatesByCountry(@PathVariable final String country, final Authentication authentication) {

		if (UserInfo.isSuperAdmin(authentication)) {
			return duplicateGroupViewRepository.findByCountry(country);
		} else if (UserInfo.isSimpleUser(authentication) || UserInfo.isNationalAdmin(authentication)) {
			return userCountryRepository.getCountriesForUser(UserInfo.getEmail(authentication))
				.stream()
				.filter(country::equalsIgnoreCase)
				.map(duplicateGroupViewRepository::findByCountry)
				.findFirst()
				.orElse(new ArrayList<DuplicateGroupView>());
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping(value = "/duplicates/byCountry/{country}/csv", produces = "text/csv")
	public void findDuplicatesByCountryCSV(@PathVariable final String country, final HttpServletResponse res, final Authentication authentication)
		throws IOException {
		final Iterable<DuplicateGroupView> list = findDuplicatesByCountry(country, authentication);
		CSVConverter.writeCSV(res.getOutputStream(), list, DuplicateGroupView.class, "id", "name", "city", "country", "numberOfDuplicates");
	}

	private Collection<Set<OrganizationConflict>> groupConflicts(final Stream<ConflictGroupView> stream) {
		final Map<String, Set<OrganizationConflict>> map = new TreeMap<>();
		stream.forEach(c -> {
			if (!map.containsKey(c.getGroup())) {
				map.put(c.getGroup(), new TreeSet<>());
			}
			map.get(c.getGroup()).add(new OrganizationConflict(c.getId1(), c.getName1(), c.getType1(), c.getCity1(), c.getCountry1()));
			map.get(c.getGroup()).add(new OrganizationConflict(c.getId2(), c.getName2(), c.getType2(), c.getCity2(), c.getCountry2()));
		});
		return map.values();
	}

	@PostMapping("/duplicates")
	public List<OpenaireDuplicateView> duplicates(@RequestBody final List<OpenaireDuplicate> simrels, final Authentication authentication) {

		if (simrels.isEmpty()) { return new ArrayList<>(); }

		final boolean b = UserInfo.isSuperAdmin(authentication)
			|| simrels.stream()
				.map(OpenaireDuplicate::getLocalId)
				.distinct()
				.allMatch(id -> userCountryRepository.verifyAuthorizationForId(id, UserInfo.getEmail(authentication)));

		if (b) {
			databaseUtils.saveDuplicates(simrels, UserInfo.getEmail(authentication));
			return listDuplicates(simrels.get(0).getLocalId());
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping("/search/{page}/{size}")
	public Page<OrganizationSimpleView> search(@PathVariable final int page,
		@PathVariable final int size,
		@RequestParam final String q,
		@RequestParam(required = false, defaultValue = "") final String status,
		final Authentication authentication) {

		if (status.equals(SPECIAL_STATUS_FOR_CANDIDATE_DUP)) {
			return UserInfo.isSuperAdmin(authentication)
				? organizationSimpleViewRepository.searchCandidateDuplicates(q, PageRequest.of(page, size))
				: organizationSimpleViewRepository.searchCandidateDuplicatesForUser(q, UserInfo.getEmail(authentication), PageRequest.of(page, size));
		} else {
			final List<String> statuses;
			if (StringUtils.isNotBlank(status)) {
				statuses = Arrays.asList(status.split(","));
			} else if (UserInfo.isSimpleUser(authentication)) {
				statuses = Arrays.asList(OrganizationStatus.approved.toString());
			} else {
				statuses = Arrays.asList(OrganizationStatus.approved.toString(), OrganizationStatus.suggested.toString());
			}

			return UserInfo.isSuperAdmin(authentication)
				? organizationSimpleViewRepository.search(q, statuses, PageRequest.of(page, size))
				: organizationSimpleViewRepository.searchForUser(q, UserInfo.getEmail(authentication), statuses, PageRequest.of(page, size));
		}
	}

	@GetMapping("/byCountry/{status}/{code}/{page}/{size}")
	public Page<OrganizationSimpleView> findByCountry(@PathVariable final String status,
		@PathVariable final String code,
		@PathVariable final int page,
		@PathVariable final int size,
		final Authentication authentication) {
		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(code, UserInfo.getEmail(authentication))) {
			if (status.equalsIgnoreCase("all")) {
				return organizationSimpleViewRepository.findByCountryOrderByName(code, PageRequest.of(page, size));
			} else {
				return organizationSimpleViewRepository.findByCountryAndStatusOrderByName(code, status, PageRequest.of(page, size));
			}
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping("/byCountry/{status}/{code}")
	public Iterable<OrganizationSimpleView> findOrgsByStatusAndCountry(@PathVariable final String status,
		@PathVariable final String code,
		final Authentication authentication) {
		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(code, UserInfo.getEmail(authentication))) {
			if (status.equalsIgnoreCase("all")) {
				return organizationSimpleViewRepository.findByCountryOrderByName(code);
			} else {
				return organizationSimpleViewRepository.findByCountryAndStatusOrderByName(code, status);
			}
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping(value = "/byCountry/{status}/{code}/csv", produces = "text/csv")
	public void findOrgsByStatusAndCountryCSV(@PathVariable final String status,
		@PathVariable final String code,
		final HttpServletResponse res,
		final Authentication authentication) throws IOException {
		final Iterable<OrganizationSimpleView> list = findOrgsByStatusAndCountry(status, code, authentication);
		CSVConverter.writeCSV(res
			.getOutputStream(), list, OrganizationSimpleView.class, "id", "name", "type", "city", "country", "acronyms", "urls", "status", "nSimilarDups", "nSuggestedDups", "nDifferentDups");
	}

	@GetMapping("/byType/{status}/{type}/{page}/{size}")
	public Page<OrganizationSimpleView> findByType(@PathVariable final String status,
		@PathVariable final String type,
		@PathVariable final int page,
		@PathVariable final int size,
		final Authentication authentication) {

		if (UserInfo.isSuperAdmin(authentication)) {
			if (status.equalsIgnoreCase("all")) {
				return organizationSimpleViewRepository.findByTypeOrderByName(type, PageRequest.of(page, size));
			} else {
				return organizationSimpleViewRepository.findByTypeAndStatusOrderByName(type, status, PageRequest.of(page, size));
			}
		} else {
			if (status.equalsIgnoreCase("all")) {
				return organizationSimpleViewRepository.findByTypeForUser(type, UserInfo.getEmail(authentication), PageRequest.of(page, size));
			} else {
				return organizationSimpleViewRepository
					.findByTypeAndStatusForUser(type, status, UserInfo.getEmail(authentication), PageRequest.of(page, size));
			}
		}

	}

	@GetMapping("/browse/countries")
	public List<BrowseEntry> browseCountries(final Authentication authentication) {
		return UserInfo.isSuperAdmin(authentication)
			? databaseUtils.browseCountries()
			: databaseUtils.browseCountriesForUser(UserInfo.getEmail(authentication));
	}

	@GetMapping("/browse/types")
	public List<BrowseEntry> browseOrganizationTypes(final Authentication authentication) {
		return UserInfo.isSuperAdmin(authentication)
			? databaseUtils.browseTypes()
			: databaseUtils.browseTypesForUser(UserInfo.getEmail(authentication));
	}

	@PostMapping("/conflicts/fix/similar")
	public List<String> fixConflictSim(final Authentication authentication, @RequestBody final List<String> ids) {
		if (ids.size() > 1 && UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForId(ids.get(0), UserInfo.getEmail(authentication))) {
			final String newOrgId = databaseUtils.fixConflictSimilars(ids, UserInfo.getEmail(authentication));
			return Arrays.asList(newOrgId);
		} else {
			return new ArrayList<>();
		}
	}

	@PostMapping("/conflicts/fix/different")
	public List<String> fixConflictDiff(final Authentication authentication, @RequestBody final List<String> ids) {
		if (ids.size() > 1 && UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForId(ids.get(0), UserInfo.getEmail(authentication))) {
			databaseUtils.fixConflictDifferents(ids, UserInfo.getEmail(authentication));
			return ids;
		} else {
			return new ArrayList<>();
		}
	}

	@GetMapping("/note")
	public Note noteById(@RequestParam final String id, final Authentication authentication) {
		final OrganizationView org = organizationViewRepository.findById(id).get();

		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(org.getCountry(), UserInfo.getEmail(authentication))) {
			return noteRepository.findById(id).orElse(new Note(id, "", null, null));
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@PostMapping("/note")
	public Note saveNote(@RequestBody final Note note, final Authentication authentication) {
		final String orgId = note.getOrgId();

		final OrganizationView org = organizationViewRepository.findById(orgId).get();

		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(org.getCountry(), UserInfo.getEmail(authentication))) {

			if (StringUtils.isNotBlank(note.getNote())) {
				note.setModifiedBy(UserInfo.getEmail(authentication));
				note.setModificationDate(OffsetDateTime.now());
				return noteRepository.save(note);
			} else {
				noteRepository.deleteById(orgId);
				return new Note(orgId, "", null, null);
			}
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

	@GetMapping("/journal")
	public List<JournalEntry> journalEntriesById(@RequestParam final String id, final Authentication authentication) {
		final OrganizationView org = organizationViewRepository.findById(id).get();

		if (UserInfo.isSuperAdmin(authentication)
			|| userCountryRepository.verifyAuthorizationForCountry(org.getCountry(), UserInfo.getEmail(authentication))) {
			return journalEntryRepository.findByOrgIdOrderByDateDesc(id);
		} else {
			throw new RuntimeException("User not authorized");
		}
	}

}