package eu.eudat.model.builder;

import eu.eudat.authorization.AuthorizationFlags;
import eu.eudat.convention.ConventionService;
import eu.eudat.data.DescriptionEntity;
import eu.eudat.model.*;
import eu.eudat.query.DescriptionTemplateQuery;
import eu.eudat.query.DmpDescriptionTemplateQuery;
import eu.eudat.query.DmpQuery;
import gr.cite.tools.data.builder.BuilderFactory;
import gr.cite.tools.data.query.QueryFactory;
import gr.cite.tools.exception.MyApplicationException;
import gr.cite.tools.fieldset.BaseFieldSet;
import gr.cite.tools.fieldset.FieldSet;
import gr.cite.tools.logging.DataLogEntry;
import gr.cite.tools.logging.LoggerService;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

import java.util.*;
import java.util.stream.Collectors;

@Component
@Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class PublicDescriptionBuilder extends BaseBuilder<PublicDescription, DescriptionEntity> {

    private final QueryFactory queryFactory;

    private final BuilderFactory builderFactory;
    private EnumSet<AuthorizationFlags> authorize = EnumSet.of(AuthorizationFlags.None);

    @Autowired
    public PublicDescriptionBuilder(
            ConventionService conventionService,
            QueryFactory queryFactory,
            BuilderFactory builderFactory) {
        super(conventionService, new LoggerService(LoggerFactory.getLogger(PublicDescriptionBuilder.class)));
        this.queryFactory = queryFactory;
        this.builderFactory = builderFactory;
    }

    public PublicDescriptionBuilder authorize(EnumSet<AuthorizationFlags> values) {
        this.authorize = values;
        return this;
    }

    @Override
    public List<PublicDescription> build(FieldSet fields, List<DescriptionEntity> data) throws MyApplicationException {
        this.logger.debug("building for {} items requesting {} fields", Optional.ofNullable(data).map(List::size).orElse(0), Optional.ofNullable(fields).map(FieldSet::getFields).map(Set::size).orElse(0));
        this.logger.trace(new DataLogEntry("requested fields", fields));
        if (fields == null || data == null || fields.isEmpty())
            return new ArrayList<>();

        FieldSet dmpDescriptionTemplateFields = fields.extractPrefixed(this.asPrefix(PublicDescription._dmpDescriptionTemplate));
        Map<UUID, PublicDmpDescriptionTemplate> dmpDescriptionTemplateItemsMap = this.collectDmpDescriptionTemplates(dmpDescriptionTemplateFields, data);

        FieldSet descriptionTemplateFields = fields.extractPrefixed(this.asPrefix(PublicDescription._descriptionTemplate));
        Map<UUID, PublicDescriptionTemplate> descriptionTemplateItemsMap = this.collectDescriptionTemplates(descriptionTemplateFields, data);

        FieldSet dmpFields = fields.extractPrefixed(this.asPrefix(PublicDescription._dmp));
        Map<UUID, PublicDmp> dmpItemsMap = this.collectDmps(dmpFields, data);

        List<PublicDescription> models = new ArrayList<>();
        for (DescriptionEntity d : data) {
            PublicDescription m = new PublicDescription();
            if (fields.hasField(this.asIndexer(PublicDescription._id))) m.setId(d.getId());
            if (fields.hasField(this.asIndexer(PublicDescription._label)))  m.setLabel(d.getLabel());
            if (fields.hasField(this.asIndexer(PublicDescription._status))) m.setStatus(d.getStatus());
            if (fields.hasField(this.asIndexer(PublicDescription._description))) m.setDescription(d.getDescription());
            if (fields.hasField(this.asIndexer(PublicDescription._createdAt))) m.setCreatedAt(d.getCreatedAt());
            if (fields.hasField(this.asIndexer(PublicDescription._updatedAt))) m.setUpdatedAt(d.getUpdatedAt());
            if (fields.hasField(this.asIndexer(PublicDescription._finalizedAt))) m.setFinalizedAt(d.getFinalizedAt());
            if (!dmpFields.isEmpty() && dmpItemsMap != null && dmpItemsMap.containsKey(d.getDmpId()))  m.setDmp(dmpItemsMap.get(d.getDmpId()));
            if (!dmpDescriptionTemplateFields.isEmpty() && dmpDescriptionTemplateItemsMap != null && dmpDescriptionTemplateItemsMap.containsKey(d.getDmpDescriptionTemplateId()))  m.setDmpDescriptionTemplate(dmpDescriptionTemplateItemsMap.get(d.getDmpDescriptionTemplateId()));
            if (!descriptionTemplateFields.isEmpty() && descriptionTemplateItemsMap != null && descriptionTemplateItemsMap.containsKey(d.getDescriptionTemplateId()))  m.setDescriptionTemplate(descriptionTemplateItemsMap.get(d.getDescriptionTemplateId()));
            models.add(m);
        }

        this.logger.debug("build {} items", Optional.of(models).map(List::size).orElse(0));

        return models;
    }

    private Map<UUID, PublicDmpDescriptionTemplate> collectDmpDescriptionTemplates(FieldSet fields, List<DescriptionEntity> data) throws MyApplicationException {
        if (fields.isEmpty() || data.isEmpty())
            return null;
        this.logger.debug("checking related - {}", PublicDmpDescriptionTemplate.class.getSimpleName());

        Map<UUID, PublicDmpDescriptionTemplate> itemMap;
        if (!fields.hasOtherField(this.asIndexer(PublicDmpDescriptionTemplate._id))) {
            itemMap = this.asEmpty(
                    data.stream().map(DescriptionEntity::getDmpDescriptionTemplateId).distinct().collect(Collectors.toList()),
                    x -> {
                        PublicDmpDescriptionTemplate item = new PublicDmpDescriptionTemplate();
                        item.setId(x);
                        return item;
                    },
                    PublicDmpDescriptionTemplate::getId);
        } else {
            FieldSet clone = new BaseFieldSet(fields.getFields()).ensure(PublicDmpDescriptionTemplate._id);
            DmpDescriptionTemplateQuery q = this.queryFactory.query(DmpDescriptionTemplateQuery.class).authorize(this.authorize).ids(data.stream().map(DescriptionEntity::getDmpDescriptionTemplateId).distinct().collect(Collectors.toList()));
            itemMap = this.builderFactory.builder(PublicDmpDescriptionTemplateBuilder.class).authorize(this.authorize).asForeignKey(q, clone, PublicDmpDescriptionTemplate::getId);
        }
        if (!fields.hasField(PublicDmpDescriptionTemplate._id)) {
            itemMap.forEach((id, item) -> {
                if (item != null)
                    item.setId(null);
            });
        }

        return itemMap;
    }

    private Map<UUID, PublicDescriptionTemplate> collectDescriptionTemplates(FieldSet fields, List<DescriptionEntity> data) throws MyApplicationException {
        if (fields.isEmpty() || data.isEmpty())
            return null;
        this.logger.debug("checking related - {}", PublicDescriptionTemplate.class.getSimpleName());

        Map<UUID, PublicDescriptionTemplate> itemMap;
        if (!fields.hasOtherField(this.asIndexer(PublicDescriptionTemplate._id))) {
            itemMap = this.asEmpty(
                    data.stream().map(DescriptionEntity::getDescriptionTemplateId).distinct().collect(Collectors.toList()),
                    x -> {
                        PublicDescriptionTemplate item = new PublicDescriptionTemplate();
                        item.setId(x);
                        return item;
                    },
                    PublicDescriptionTemplate::getId);
        } else {
            FieldSet clone = new BaseFieldSet(fields.getFields()).ensure(PublicDescriptionTemplate._id);
            DescriptionTemplateQuery q = this.queryFactory.query(DescriptionTemplateQuery.class).authorize(this.authorize).ids(data.stream().map(DescriptionEntity::getDescriptionTemplateId).distinct().collect(Collectors.toList()));
            itemMap = this.builderFactory.builder(PublicDescriptionTemplateBuilder.class).authorize(this.authorize).asForeignKey(q, clone, PublicDescriptionTemplate::getId);
        }
        if (!fields.hasField(PublicDescriptionTemplate._id)) {
            itemMap.forEach((id, item) -> {
                if (item != null)
                    item.setId(null);
            });
        }

        return itemMap;
    }

    private Map<UUID, PublicDmp> collectDmps(FieldSet fields, List<DescriptionEntity> data) throws MyApplicationException {
        if (fields.isEmpty() || data.isEmpty())
            return null;
        this.logger.debug("checking related - {}", PublicDmp.class.getSimpleName());

        Map<UUID, PublicDmp> itemMap;
        if (!fields.hasOtherField(this.asIndexer(PublicDmp._id))) {
            itemMap = this.asEmpty(
                    data.stream().map(DescriptionEntity::getDmpId).distinct().collect(Collectors.toList()),
                    x -> {
                        PublicDmp item = new PublicDmp();
                        item.setId(x);
                        return item;
                    },
                    PublicDmp::getId);
        } else {
            FieldSet clone = new BaseFieldSet(fields.getFields()).ensure(PublicDmp._id);
            DmpQuery q = this.queryFactory.query(DmpQuery.class).authorize(this.authorize).ids(data.stream().map(DescriptionEntity::getDmpId).distinct().collect(Collectors.toList()));
            itemMap = this.builderFactory.builder(PublicDmpBuilder.class).authorize(this.authorize).asForeignKey(q, clone, PublicDmp::getId);
        }
        if (!fields.hasField(PublicDmp._id)) {
            itemMap.forEach((id, item) -> {
                if (item != null)
                    item.setId(null);
            });
        }

        return itemMap;
    }

}