package eu.old.eudat.migration;

import eu.eudat.commons.XmlHandlingService;
import eu.eudat.commons.enums.FieldType;
import eu.eudat.commons.types.descriptiontemplate.*;
import eu.eudat.commons.types.descriptiontemplate.fielddata.BaseFieldDataEntity;
import eu.eudat.commons.types.descriptiontemplate.fielddata.LabelDataEntity;
import eu.eudat.commons.types.descriptiontemplate.fielddata.ReferenceTypeDataEntity;
import eu.eudat.convention.ConventionService;
import eu.eudat.data.DescriptionTemplateEntity;
import eu.eudat.data.ReferenceTypeEntity;
import eu.eudat.model.DescriptionTemplate;
import eu.eudat.model.ReferenceType;
import eu.eudat.query.DescriptionTemplateQuery;
import eu.eudat.query.ReferenceTypeQuery;
import gr.cite.tools.data.query.Ordering;
import gr.cite.tools.data.query.Paging;
import gr.cite.tools.data.query.QueryFactory;
import gr.cite.tools.fieldset.BaseFieldSet;
import gr.cite.tools.logging.LoggerService;
import jakarta.persistence.EntityManager;
import jakarta.xml.bind.JAXBException;
import org.jetbrains.annotations.NotNull;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.xml.sax.SAXException;

import javax.management.InvalidApplicationException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

@Service
public class DescriptionTemplateXmlCleanInvalidReferenceTypesService {

    private static final LoggerService logger = new LoggerService(LoggerFactory.getLogger(DescriptionTemplateXmlCleanInvalidReferenceTypesService.class));
    private final EntityManager entityManager;
    private final ConventionService conventionService;
    private final XmlHandlingService xmlHandlingService;
    private final QueryFactory queryFactory;

    private static final int PageSize = 500;
    private static final boolean TestMode = false;

    public DescriptionTemplateXmlCleanInvalidReferenceTypesService(EntityManager entityManager, ConventionService conventionService, XmlHandlingService xmlHandlingService, QueryFactory queryFactory) {
        this.entityManager = entityManager;
        this.conventionService = conventionService;
        this.xmlHandlingService = xmlHandlingService;
	    this.queryFactory = queryFactory;
    }

    public void migrate() throws IOException, NoSuchFieldException, IllegalAccessException, JAXBException, ParserConfigurationException, InstantiationException, SAXException, InvalidApplicationException, TransformerException, URISyntaxException {
        long total = this.queryFactory.query(DescriptionTemplateQuery.class).count();
        logger.debug("Clean old reference types from DescriptionTemplate Total : " + total);
        int page = 0;

        List<UUID> existingReferenceTypeIds = this.queryFactory.query(ReferenceTypeQuery.class).collectAs(new BaseFieldSet().ensure(ReferenceType._id)).stream().map(ReferenceTypeEntity::getId).toList();
        List<DescriptionTemplateEntity> items;
        do {
            DescriptionTemplateQuery query = this.queryFactory.query(DescriptionTemplateQuery.class);
            query.setOrder(new Ordering().addDescending(DescriptionTemplate._createdAt));
            query.setPage(new Paging(page * PageSize, PageSize));
            items = query.collect();
            if (items != null && !items.isEmpty()) {

                logger.debug("Migrate DescriptionTemplate " + page * PageSize + " of " + total);

                for (DescriptionTemplateEntity item : items) {
                    if (this.conventionService.isNullOrEmpty(item.getDefinition())) continue;
                    DefinitionEntity definition = this.xmlHandlingService.fromXml(DefinitionEntity.class, item.getDefinition());
                    item.setDefinition(this.xmlHandlingService.toXml(this.buildDefinitionEntity(definition, existingReferenceTypeIds)));
                    this.entityManager.merge(item);
                }

                this.entityManager.flush();
                page++;
            }
        } while (items != null && !items.isEmpty() && !TestMode);

        this.entityManager.flush();
    }

    private @NotNull DefinitionEntity buildDefinitionEntity(DefinitionEntity persist, List<UUID> existingReferenceTypeIds) {
        DefinitionEntity data = new DefinitionEntity();
        if (persist == null)
            return data;
        if (!this.conventionService.isListNullOrEmpty(persist.getPages())) {
            data.setPages(new ArrayList<>());
            for (PageEntity pagePersist : persist.getPages()) {
                data.getPages().add(this.buildPageEntity(pagePersist, existingReferenceTypeIds));
            }
        }

        return data;
    }

    private @NotNull SectionEntity buildSectionEntity(SectionEntity persist, List<UUID> existingReferenceTypeIds) {
        SectionEntity data = new SectionEntity();
        if (persist == null)
            return data;

        data.setId(persist.getId());
        data.setDescription(persist.getDescription());
        data.setExtendedDescription(persist.getExtendedDescription());
        data.setNumbering(persist.getNumbering());
        data.setOrdinal(persist.getOrdinal());
        data.setDefaultVisibility(persist.isDefaultVisibility());
        data.setMultiplicity(persist.getMultiplicity());
        data.setTitle(persist.getTitle());

        if (!this.conventionService.isListNullOrEmpty(persist.getSections())) {
            data.setSections(new ArrayList<>());
            for (SectionEntity sectionPersist : persist.getSections()) {
                data.getSections().add(this.buildSectionEntity(sectionPersist, existingReferenceTypeIds));
            }
        }

        if (!this.conventionService.isListNullOrEmpty(persist.getFieldSets())) {
            data.setFieldSets(new ArrayList<>());
            for (FieldSetEntity fieldSetPersist : persist.getFieldSets()) {
                data.getFieldSets().add(this.buildFieldSetEntity(fieldSetPersist, existingReferenceTypeIds));
            }
        }

        return data;
    }

    private @NotNull FieldSetEntity buildFieldSetEntity(FieldSetEntity persist, List<UUID> existingReferenceTypeIds) {
        FieldSetEntity data = new FieldSetEntity();
        if (persist == null)
            return data;

        data.setId(persist.getId());
        data.setOrdinal(persist.getOrdinal());
        data.setNumbering(persist.getNumbering());
        data.setTitle(persist.getTitle());
        data.setExtendedDescription(persist.getExtendedDescription());
        data.setAdditionalInformation(persist.getAdditionalInformation());
        data.setHasCommentField(persist.getHasCommentField());
        data.setMultiplicity(persist.getMultiplicity());

        if (!this.conventionService.isListNullOrEmpty(persist.getFields())) {
            data.setFields(new ArrayList<>());
            for (FieldEntity fieldPersist : persist.getFields()) {
                data.getFields().add(this.buildFieldEntity(fieldPersist, existingReferenceTypeIds));
            }
        }
        return data;
    }

    private @NotNull FieldEntity buildFieldEntity(FieldEntity persist, List<UUID> existingReferenceTypeIds) {
        FieldEntity data = new FieldEntity();
        if (persist == null)
            return data;

        data.setId(persist.getId());
        data.setOrdinal(persist.getOrdinal());
        data.setSchematics(persist.getSchematics());
        data.setNumbering(persist.getNumbering());
        data.setDefaultValue(persist.getDefaultValue());
        data.setValidations(persist.getValidations());
        data.setIncludeInExport(persist.getIncludeInExport());
        data.setVisibilityRules(persist.getVisibilityRules());
        if (persist.getData() != null) data.setData(this.buildFieldDataEntity(persist.getData(), existingReferenceTypeIds));

        return data;
    }

    private BaseFieldDataEntity buildFieldDataEntity(BaseFieldDataEntity persist, List<UUID> existingReferenceTypeIds) {
        if (persist.getFieldType().equals(FieldType.REFERENCE_TYPES)){
            ReferenceTypeDataEntity entity = (ReferenceTypeDataEntity)persist;
            if (existingReferenceTypeIds.contains(entity.getReferenceTypeId())) return entity;
            else {
                LabelDataEntity data = new LabelDataEntity();
                data.setLabel(entity.getLabel());
                data.setFieldType(FieldType.TEXT_AREA);
                return data;
            }
        } else {
            return persist;
        }
    }



    private @NotNull PageEntity buildPageEntity(PageEntity persist, List<UUID> existingReferenceTypeIds) {
        PageEntity data = new PageEntity();
        if (persist == null)
            return data;

        data.setId(persist.getId());
        data.setOrdinal(persist.getOrdinal());
        data.setTitle(persist.getTitle());

        if (!this.conventionService.isListNullOrEmpty(persist.getSections())) {
            data.setSections(new ArrayList<>());
            for (SectionEntity sectionPersist : persist.getSections()) {
                data.getSections().add(this.buildSectionEntity(sectionPersist, existingReferenceTypeIds));
            }
        }
        return data;
    }
}