/* 
 * Copyright (c) 2015, Apocalypse Laboratories
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this 
 * list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 * 
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.apocalypselabs.symat;

import java.util.prefs.BackingStoreException;
import java.util.prefs.Preferences;

/**
 *
 * @author Skylar Ittner
 */
public class PrefStorage {

    private static final Preferences prefs = Preferences.userNodeForPackage(PrefStorage.class);

    public static void saveSetting(String key, String value) {
        prefs.put(key, value);
    }

    public static boolean isset(String key) {
        return !getSetting(key, "NULL").equals("NULL");
    }

    public static void unset(String key) {
        saveSetting(key, "");
        save();
        prefs.remove(key);
        save();
    }

    public static String getSetting(String key) {
        return prefs.get(key, "");
    }

    public static String getSetting(String key, String emptyResponse) {
        return prefs.get(key, emptyResponse);
    }

    public static boolean save() {
        try {
            prefs.flush();
        } catch (BackingStoreException ex) {
            System.err.println("Settings could not be saved!");
            return false;
        }
        return true;
    }

    // xkcd 221 compliance.
    int getRandomNumber() {
        return 4; // chosen by fair dice roll.
        // guaranteed to be random.
    }
}