/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.common.portability.internal.windows;

import com.redhat.thermostat.common.portability.PortableProcessImpl;
import com.redhat.thermostat.common.portability.ProcessUserInfo;
import com.redhat.thermostat.common.portability.ProcessUserInfoBuilder;
import com.redhat.thermostat.common.portability.PortableProcess;
import com.redhat.thermostat.common.utils.LoggingUtils;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Build User information via Windows helper classes
 */
public class WindowsUserInfoBuilderImpl implements ProcessUserInfoBuilder {

    private final PortableProcess procHelper;

    private static final ProcessUserInfo NON_EXISTENT_USER = new ProcessUserInfo();
    private static final Logger logger = LoggingUtils.getLogger(WindowsUserInfoBuilderImpl.class);

    public WindowsUserInfoBuilderImpl() {
        this(PortableProcessImpl.getInstance());
    }

    WindowsUserInfoBuilderImpl(PortableProcess helper) {
        this.procHelper = helper;
    }

    @Override
    public ProcessUserInfo build(int pid) {
        ProcessUserInfo info = NON_EXISTENT_USER;
        try {
            final long uid = procHelper.getUid(pid);
            final String name = procHelper.getUserName(pid);
            info = new ProcessUserInfo(uid, name);
        } catch (Exception e) {
            logger.log(Level.WARNING, "Unable to read user info for " + pid, e);
        }

        return info;
    }
}