package eu.eudat.model.builder;

import eu.eudat.authorization.AuthorizationFlags;
import eu.eudat.convention.ConventionService;
import eu.eudat.data.StorageFileEntity;
import eu.eudat.model.*;
import eu.eudat.query.*;
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 StorageFileBuilder extends BaseBuilder<StorageFile, StorageFileEntity> {

    private final QueryFactory queryFactory;

    private final BuilderFactory builderFactory;

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

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

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

    @Override
    public List<StorageFile> build(FieldSet fields, List<StorageFileEntity> 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 userFields = fields.extractPrefixed(this.asPrefix(StorageFile._owner));
        Map<UUID, User> userItemsMap = this.collectUsers(userFields, data);

        List<StorageFile> models = new ArrayList<>();
        for (StorageFileEntity d : data) {
            StorageFile m = new StorageFile();
            if (fields.hasField(this.asIndexer(StorageFile._id))) m.setId(d.getId());
            if (fields.hasField(this.asIndexer(StorageFile._name)))  m.setName(d.getName());
            if (fields.hasField(this.asIndexer(StorageFile._fileRef))) m.setFileRef(d.getFileRef());
            if (fields.hasField(this.asIndexer(StorageFile._extension))) m.setExtension(d.getExtension());
            if (fields.hasField(this.asIndexer(StorageFile._createdAt))) m.setCreatedAt(d.getCreatedAt());
            if (fields.hasField(this.asIndexer(StorageFile._mimeType))) m.setMimeType(d.getMimeType());
            if (fields.hasField(this.asIndexer(StorageFile._storageType))) m.setStorageType(d.getStorageType());
            if (fields.hasField(this.asIndexer(StorageFile._purgeAt))) m.setPurgeAt(d.getPurgeAt());
            if (fields.hasField(this.asIndexer(StorageFile._purgedAt))) m.setPurgedAt(d.getPurgedAt());
            if (fields.hasField(this.asIndexer(StorageFile._fullName))) m.setFullName(d.getName() + (d.getExtension().startsWith(".") ? "" : ".") + d.getExtension());
            if (!userFields.isEmpty() && userItemsMap != null && userItemsMap.containsKey(d.getOwnerId())) m.setOwner(userItemsMap.get(d.getOwnerId()));
            models.add(m);
        }

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

        return models;
    }

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

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

        return itemMap;
    }

}