package net.curisit.securis.services.helpers;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Date;

import javax.inject.Inject;
import javax.inject.Singleton;
import javax.persistence.EntityManager;

import net.curisit.securis.db.License;
import net.curisit.securis.db.LicenseHistory;
import net.curisit.securis.db.LicenseStatus;
import net.curisit.securis.db.User;
import net.curisit.securis.security.BasicSecurityContext;
import net.curisit.securis.services.exception.SeCurisServiceException;

import org.apache.commons.io.FileUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

@Singleton
public class LicenseHelper {

    private static final Logger LOG = LogManager.getLogger(LicenseHelper.class);

    @Inject
    private UserHelper userHelper;

    /**
     * Cancel the license
     * 
     * @param lic
     * @param em
     */
    public void cancelLicense(License lic, String reason, BasicSecurityContext bsc, EntityManager em) throws SeCurisServiceException {
        lic.setStatus(LicenseStatus.CANCELLED);
        lic.setCancelledById(bsc.getUserPrincipal().getName());
        lic.setModificationTimestamp(new Date());
        em.persist(lic);

        em.persist(createLicenseHistoryAction(lic, userHelper.getUser(bsc, em), LicenseHistory.Actions.CANCEL, "Cancellation reason: " + reason));

    }

    public LicenseHistory createLicenseHistoryAction(License lic, User user, String action, String comments) {
        LicenseHistory lh = new LicenseHistory();
        lh.setLicense(lic);
        lh.setUser(user);
        lh.setCreationTimestamp(new Date());
        lh.setAction(action);
        lh.setComments(comments);
        return lh;
    }

    public LicenseHistory createLicenseHistoryAction(License lic, User user, String action) {
        return createLicenseHistoryAction(lic, user, action, null);
    }

    public File createTemporaryLicenseFile(License lic, String licFileName) throws IOException {
        File f = Files.createTempDirectory("securis-server").toFile();
        f = new File(f, licFileName);
        FileUtils.writeStringToFile(f, lic.getLicenseData());
        return f;
    }
}