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/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package org.dspace.rdf.storage;

import java.sql.SQLException;
import java.util.List;
import java.util.UUID;

import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.Logger;
import org.dspace.content.DSpaceObject;
import org.dspace.content.factory.ContentServiceFactory;
import org.dspace.content.service.SiteService;
import org.dspace.core.Constants;
import org.dspace.core.Context;
import org.dspace.handle.service.HandleService;
import org.springframework.beans.factory.annotation.Autowired;

/**
 * @author Pascal-Nicolas Becker (dspace -at- pascal -hyphen- becker -dot- de)
 */
public class HandleURIGenerator implements URIGenerator {
    private static final Logger log = org.apache.logging.log4j.LogManager.getLogger(HandleURIGenerator.class);

    @Autowired(required = true)
    protected SiteService siteService;
    @Autowired(required = true)
    protected HandleService handleService;


    @Override
    public String generateIdentifier(Context context, int type, UUID id,
                                     String handle, List identifiers) throws SQLException {
        if (type == Constants.SITE) {
            return handleService.getCanonicalForm(siteService.findSite(context).getHandle());
        }

        if (type == Constants.COMMUNITY
            || type == Constants.COLLECTION
            || type == Constants.ITEM) {
            if (StringUtils.isEmpty(handle)) {
                throw new IllegalArgumentException("Handle is null");
            }
            log.debug("Generated identifier "
                          + handleService.getCanonicalForm(handle) + " for "
                          + Constants.typeText[type] + " " + id.toString() + ".");
            return handleService.getCanonicalForm(handle);
        }

        return null;
    }

    @Override
    public String generateIdentifier(Context context, DSpaceObject dso) throws SQLException {
        if (dso.getType() != Constants.SITE
            && dso.getType() != Constants.COMMUNITY
            && dso.getType() != Constants.COLLECTION
            && dso.getType() != Constants.ITEM) {
            return null;
        }

        return generateIdentifier(context, dso.getType(), dso.getID(),
                                  dso.getHandle(), ContentServiceFactory.getInstance().getDSpaceObjectService(dso)
                                                                        .getIdentifiers(context, dso));
    }
}