/*
    GNU GENERAL LICENSE
    Copyright (C) 2006 The Lobo Project. Copyright (C) 2014 - 2017 Lobo Evolution

    This program 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
    verion 3 of the License, or (at your option) any later version.

    This program 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 License for more details.

    You should have received a copy of the GNU General Public
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
    

    Contact info: lobochief@users.sourceforge.net; ivan.difrancesco@yahoo.it
 */
package org.lobobrowser.util.gui;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * The Class StorageManagerCommon.
 */
public class StorageManagerCommon {
    /** The Constant logger. */
    private static final Logger logger = LogManager
            .getLogger(StorageManagerCommon.class);
    /** The Constant SETTINGS_DIR. */
    private static final String SETTINGS_DIR = "settings";
    /** The Constant STORE_DIR_NAME. */
    private static final String STORE_DIR_NAME = ".lobo";
    /** The Constant instance. */
    private static final StorageManagerCommon instance = new StorageManagerCommon();
    
    /** Gets the Constant instance.
	 *
	 * @return the Constant instance
	 */
    public static StorageManagerCommon getInstance() throws IOException {
        return instance;
    }
    
    /**
     * Save settings.
     *
     * @param name
     *            the name
     * @param data
     *            the data
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    public void saveSettings(String name, Serializable data)
            throws IOException {
        File dir = this.getSettingsDirectory();
        if (!dir.exists()) {
            dir.mkdirs();
        }
        File file = new File(dir, name);
        OutputStream out = new FileOutputStream(file);
        BufferedOutputStream bos = new BufferedOutputStream(out);
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        try {
            oos.writeObject(data);
            oos.flush();
        } finally {
            oos.close();
            bos.close();
            out.close();
        }
    }
    
    /**
     * Retrieve settings.
     *
     * @param name
     *            the name
     * @param classLoader
     *            the class loader
     * @return the serializable
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     * @throws ClassNotFoundException
     *             the class not found exception
     */
    public Serializable retrieveSettings(String name, ClassLoader classLoader)
            throws IOException, ClassNotFoundException {
        File dir = this.getSettingsDirectory();
        if (!dir.exists()) {
            return null;
        }
        File file = new File(dir, name);
        if (!file.exists()) {
            return null;
        }
        InputStream in = new FileInputStream(file);
        BufferedInputStream bin = new BufferedInputStream(in);
        ObjectInputStream ois = new ClassLoaderObjectInputStream(bin,
                classLoader);
        try {
            try {
                return (Serializable) ois.readObject();
            } catch (InvalidClassException ice) {
                logger.error(ice.getMessage());
                return null;
            }
        } finally {
            ois.close();
            bin.close();
            in.close();
        }
    }
    
    /** Gets the settings directory.
	 *
	 * @return the settings directory
	 */
    public File getSettingsDirectory() {
        File homeDir = new File(System.getProperty("user.home"));
        File settingsDir = new File(homeDir, STORE_DIR_NAME);
        return new File(settingsDir, SETTINGS_DIR);
    }
}