package eu.eudat.controllers;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import eu.eudat.authorization.AuthorizationFlags;
import eu.eudat.authorization.Permission;
import eu.eudat.commons.XmlHandlingService;
import eu.eudat.commons.enums.FieldType;
import eu.eudat.commons.scope.user.UserScope;
import eu.eudat.commons.types.descriptiontemplate.DefinitionEntity;
import eu.eudat.commons.types.descriptiontemplate.FieldEntity;
import eu.eudat.commons.types.descriptiontemplate.FieldSetEntity;
import eu.eudat.commons.types.descriptiontemplate.SectionEntity;
import eu.eudat.commons.types.descriptiontemplate.fielddata.UploadDataEntity;
import eu.eudat.data.DescriptionTemplateEntity;
import eu.eudat.data.old.Dataset;
import eu.eudat.data.old.FileUpload;
import eu.eudat.exceptions.security.UnauthorisedException;
import eu.eudat.logic.managers.DatasetProfileManager;
import eu.eudat.logic.services.ApiContext;
import eu.eudat.logic.services.operations.DatabaseRepository;
import eu.eudat.logic.utilities.documents.helpers.FileEnvelope;
import eu.eudat.logic.utilities.json.JsonSearcher;
import eu.eudat.models.HintedModelFactory;
import eu.eudat.models.data.datasetwizard.DatasetWizardModel;
import eu.eudat.models.data.helpers.responses.ResponseItem;
import eu.eudat.query.DescriptionTemplateQuery;
import eu.eudat.types.ApiMessageCode;
import gr.cite.commons.web.authz.service.AuthorizationService;
import gr.cite.tools.data.query.QueryFactory;
import jakarta.xml.bind.JAXBException;
import org.apache.poi.util.IOUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.unit.DataSize;
import org.springframework.util.unit.DataUnit;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import jakarta.transaction.Transactional;
import org.xml.sax.SAXException;

import javax.management.InvalidApplicationException;
import javax.xml.parsers.ParserConfigurationException;
import java.io.*;
import java.nio.file.Files;
import java.util.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.stream.Collectors;

@RestController
@CrossOrigin
@RequestMapping(value = {"/api/file/"})
public class FileController {

    private DatasetProfileManager datasetProfileManager;
    private final Environment environment;
    private DatabaseRepository databaseRepository;
    private final AuthorizationService authorizationService;
    private final UserScope userScope;
    private final QueryFactory queryFactory;
    private final XmlHandlingService xmlHandlingService;

    @Autowired
    public FileController(DatasetProfileManager datasetProfileManager, Environment environment, ApiContext apiContext, AuthorizationService authorizationService, UserScope userScope, QueryFactory queryFactory, XmlHandlingService xmlHandlingService) {
        this.datasetProfileManager = datasetProfileManager;
        this.environment = environment;
        this.databaseRepository = apiContext.getOperationsContext().getDatabaseRepository();
        this.authorizationService = authorizationService;
        this.userScope = userScope;
        this.queryFactory = queryFactory;
        this.xmlHandlingService = xmlHandlingService;
    }

    @RequestMapping(method = RequestMethod.POST, value = {"/upload"})
    public ResponseEntity<ResponseItem<String>> upload(
            @RequestParam("file") MultipartFile file, @RequestParam("datasetProfileId") String datasetProfileId, @RequestParam("fieldId") String fieldId)
            throws IllegalAccessException, IOException, InvalidApplicationException, JAXBException, ParserConfigurationException, InstantiationException, SAXException {
        this.authorizationService.authorizeForce(Permission.AdminRole, Permission.ManagerRole, Permission.UserRole);
        
        String uuid = UUID.randomUUID().toString();

        DescriptionTemplateEntity descriptionTemplate = this.queryFactory.query(DescriptionTemplateQuery.class).ids(UUID.fromString(datasetProfileId)).authorize(AuthorizationFlags.OwnerOrPermission).first();
        DefinitionEntity definition = descriptionTemplate == null ? null : this.xmlHandlingService.fromXml(DefinitionEntity.class, descriptionTemplate.getDefinition());

        AtomicBoolean acceptedFile = new AtomicBoolean(false);
        List<FieldEntity> fieldEntities = definition != null ? definition.getFieldById(fieldId).stream().filter(x -> x != null && x.getData() != null && x.getData().getFieldType().equals(FieldType.UPLOAD)).toList() : new ArrayList<>();

        fieldEntities.forEach(x-> {
            UploadDataEntity uploadDataEntity = (UploadDataEntity)x.getData();
            if (DataSize.ofBytes(file.getSize()).equals(DataSize.ofMegabytes(uploadDataEntity.getMaxFileSizeInMB()))) {
                acceptedFile.set(true);
            }
            if(acceptedFile.get() && uploadDataEntity.getTypes() != null && !uploadDataEntity.getTypes().isEmpty()) {
                acceptedFile.set(false);
                for (UploadDataEntity.Option option: uploadDataEntity.getTypes()) {
                    if(Objects.equals(file.getContentType(), option.getValue())) {
                        acceptedFile.set(true);
                    }
                }
            }
        });

        if(!acceptedFile.get()) {
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(new ResponseItem<String>().status(ApiMessageCode.ERROR_MESSAGE).message("The uploaded file is too large or has an unaccepted type"));
        }


        File convFile = new File(this.environment.getProperty("temp.temp") + uuid);
        convFile.createNewFile();
        FileOutputStream fos = new FileOutputStream(convFile);
        fos.write(file.getBytes());
        fos.close();


        return ResponseEntity.status(HttpStatus.OK).body(new ResponseItem<String>().payload(uuid)
                .status(ApiMessageCode.SUCCESS_MESSAGE).message(""));
    }

    @RequestMapping(method = RequestMethod.POST, value = {"/delete-temp"})
    public ResponseEntity<ResponseItem<String>> upload(@RequestBody String filename) throws IllegalAccessException, IOException {
        File convFile = new File(this.environment.getProperty("temp.temp") + filename);
//        Boolean deleted = convFile.delete();
        Boolean deleted = Files.deleteIfExists(convFile.toPath());

        return ResponseEntity.status(HttpStatus.OK).body(new ResponseItem<String>().payload(deleted.toString())
                .status(ApiMessageCode.SUCCESS_MESSAGE).message(""));
    }

    @Transactional
    @RequestMapping(method = RequestMethod.GET, value = {"{id}"}, produces = "application/json")
    public @ResponseBody
    ResponseEntity download(@PathVariable String id) throws IOException, InvalidApplicationException {

        this.authorizationService.authorizeForce(Permission.AdminRole, Permission.ManagerRole, Permission.UserRole, Permission.AnonymousRole);
        
        FileUpload fileUpload = databaseRepository.getFileUploadDao().find(UUID.fromString(id));
        if(fileUpload == null) {
            throw new NoSuchElementException("File with id "+id+" not found");
        }

        if(fileUpload.getEntityType().name().equals(FileUpload.EntityType.DATASET.name())) {
            Dataset datasetEntity = databaseRepository.getDatasetDao().find(fileUpload.getEntityId(), HintedModelFactory.getHint(DatasetWizardModel.class));
            if (datasetEntity == null) {
                throw new NoSuchElementException("No dataset with id " + fileUpload.getEntityId() + "  found. This dataset was related to the file with id " + id);
            }
            if (!datasetEntity.getDmp().isPublic() && datasetEntity.getDmp().getUsers()
                    .stream().filter(userInfo ->  this.userScope.getUserIdSafe().equals(userInfo.getUser().getId()))
                    .collect(Collectors.toList()).size() == 0)
                throw new UnauthorisedException();
        }

        FileEnvelope fileEnvelope = new FileEnvelope();
        fileEnvelope.setFilename(fileUpload.getName());
        File exportFile = new File(this.environment.getProperty("file.storage") + id);
        fileEnvelope.setFile(exportFile);

        InputStream resource = new FileInputStream(fileEnvelope.getFile());
        HttpHeaders responseHeaders = new HttpHeaders();
        responseHeaders.setContentLength(fileEnvelope.getFile().length());
        responseHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        String fileName = fileEnvelope.getFilename().replace(" ", "_").replace(",", "_");
        responseHeaders.set("Content-Disposition", "attachment;filename=" + fileName);
        responseHeaders.set("Access-Control-Expose-Headers", "Content-Disposition");
        responseHeaders.set("Cache-Control", "no-store");
        responseHeaders.get("Access-Control-Expose-Headers").add("Content-Type");

        byte[] content = IOUtils.toByteArray(resource);
        resource.close();
        return new ResponseEntity<>(content,
                responseHeaders,
                HttpStatus.OK);

    }

}