package eu.old.eudat.migration;

import com.fasterxml.jackson.core.JsonProcessingException;
import eu.eudat.commons.JsonHandlingService;
import eu.eudat.commons.enums.*;
import eu.eudat.data.DescriptionEntity;
import eu.old.eudat.data.entities.Dataset;
import eu.old.eudat.logic.services.operations.DatabaseRepository;
import eu.old.eudat.models.data.datasetwizard.DatasetWizardModel;
import eu.old.eudat.queryable.QueryableList;
import jakarta.persistence.EntityManager;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class DatasetMigrationService {

    private final DatabaseRepository databaseRepository;

    private final JsonHandlingService jsonHandlingService;

    private final EntityManager entityManager;

    public DatasetMigrationService(DatabaseRepository databaseRepository, JsonHandlingService jsonHandlingService, EntityManager entityManager) {
        this.databaseRepository = databaseRepository;
        this.jsonHandlingService = jsonHandlingService;
        this.entityManager = entityManager;
    }

    public QueryableList<Dataset> datasetQueryableList() {
        return databaseRepository.getDatasetDao().asQueryable();
    }

    public List<DatasetWizardModel> getDatasets(Integer skip, Integer take) {
        List<Dataset> datasets = datasetQueryableList()
                .orderBy((builder, root) -> builder.desc(root.get("created")))
                .skip(skip)
                .take(take)
                .toList();

        return datasets.stream().map(x -> {
            DatasetWizardModel dataset = new DatasetWizardModel();
            dataset.fromDataModel(x);
            return dataset;
        }).toList();
    }

    public List<DatasetMigrationCollectedInfo> collectDatasetsInfo() throws JsonProcessingException {
        List<DatasetMigrationCollectedInfo> collectedInfoList = new ArrayList<>();
        List<DatasetWizardModel> datasets = getDatasets(0, Integer.MAX_VALUE);
        for (DatasetWizardModel datasetWizardModel : datasets) {
            DatasetMigrationCollectedInfo datasetMigrationCollectedInfo = new DatasetMigrationCollectedInfo();

            //Collect basic dataset information
            DescriptionEntity descriptionEntity = new DescriptionEntity();
            descriptionEntity.setId(datasetWizardModel.getId());
            descriptionEntity.setDescription(datasetWizardModel.getDescription());
            descriptionEntity.setCreatedById(datasetWizardModel.getCreatedBy());
            descriptionEntity.setDmpId(datasetWizardModel.getDmp().getId());
            descriptionEntity.setLabel(datasetWizardModel.getLabel());
            if (datasetWizardModel.getCreated() != null)
                descriptionEntity.setCreatedAt(datasetWizardModel.getCreated().toInstant());
            if (datasetWizardModel.getModified() != null)
                descriptionEntity.setUpdatedAt(datasetWizardModel.getModified().toInstant());
            if (datasetWizardModel.getFinalized() != null)
                descriptionEntity.setFinalizedAt(datasetWizardModel.getFinalized().toInstant());
            if (datasetWizardModel.getStatus() == 99) {
                descriptionEntity.setIsActive(IsActive.Inactive);
                descriptionEntity.setStatus(DescriptionStatus.Canceled);
            } else {
                descriptionEntity.setIsActive(IsActive.Active);
                descriptionEntity.setStatus(DescriptionStatus.of(datasetWizardModel.getStatus()));
            }
//            descriptionEntity.setDmpDescriptionTemplateId(); //TODO MIGRATE DMPDESCRIPTIONTEMPLATES

            datasetMigrationCollectedInfo.descriptionEntity = descriptionEntity;

            collectedInfoList.add(datasetMigrationCollectedInfo);
        }
        return collectedInfoList;
    }

    public String migrate() throws JsonProcessingException {
        for (DatasetMigrationCollectedInfo collectedInfo : collectDatasetsInfo()) {
            this.entityManager.persist(collectedInfo.descriptionEntity);
        }
        this.entityManager.flush();
        return "Migrated dmps";
    }

    public static class DatasetMigrationCollectedInfo {

        public DescriptionEntity descriptionEntity;

    }

}