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/**
 * Copyright (C) 2019 Bonitasoft S.A.
 * Bonitasoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation
 * version 2.1 of the License.
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301, USA.
 **/
package org.bonitasoft.engine.services.impl;

import lombok.extern.slf4j.Slf4j;
import org.bonitasoft.engine.commons.ExceptionUtils;
import org.bonitasoft.engine.services.QueriableLogSessionProvider;
import org.bonitasoft.engine.session.SSessionNotFoundException;
import org.bonitasoft.engine.session.SessionService;
import org.bonitasoft.engine.session.model.SSession;
import org.bonitasoft.engine.sessionaccessor.ReadSessionAccessor;
import org.bonitasoft.engine.sessionaccessor.SessionIdNotSetException;

/**
 * @author Elias Ricken de Medeiros
 * @author Matthieu Chaffotte
 * @author Celine Souchet
 */
@Slf4j
public class QueriableLogSessionProviderImpl implements QueriableLogSessionProvider {

    private final SessionService sessionService;

    private final ReadSessionAccessor sessionAccessor;

    private final ThreadLocal localSession = new ThreadLocal<>();

    public QueriableLogSessionProviderImpl(final SessionService sessionService,
            final ReadSessionAccessor sessionAccessor) {
        this.sessionService = sessionService;
        this.sessionAccessor = sessionAccessor;
    }

    private SSession getSession() {
        SSession session = localSession.get();
        try {
            if (session == null || session.getId() != sessionAccessor.getSessionId()) {
                long sessionId;
                sessionId = sessionAccessor.getSessionId();
                session = sessionService.getSession(sessionId);
                localSession.set(session);
            }
        } catch (final SessionIdNotSetException e) {
            // system: no session
            return null;
        } catch (final SSessionNotFoundException e) {
            log.warn(ExceptionUtils.printLightWeightStacktrace(e));
        }
        return session;
    }

    @Override
    public String getUserId() {
        final SSession session = getSession();
        if (session != null) {
            return session.getUserName();
        }
        return SessionService.SYSTEM;
    }

    @Override
    public String getClusterNode() {
        final SSession session = getSession();
        if (session != null) {
            return session.getClusterNode();
        }
        return "";
    }

}