/*

 *   StarOffice News Server

 *   see AUTHORS for the list of contributors

 *

 *   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 version 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 Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

package com.so.news;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Properties;

/**

 * Manages the n3tpd configuration.

 * @author Christian Lins

 */

public class Config

{

  /** The filename of the logfile */

  public static final String CONFIG_N3TPD_LOGFILE = "n3tpd.logfile";

  /** The filename of the config file that is loaded on startup */

  public static final String FILE                 = "n3tpd.conf";

  private static final Properties defaultConfig = new Properties();

  private static Config instance = null;

  static

  {

    // Set some default values

    defaultConfig.setProperty("n3tpd.article.lifetime", "300"); // 300 days

    defaultConfig.setProperty("n3tpd.article.maxsize", "100");  // 100 kbyte

    defaultConfig.setProperty("n3tpd.port", "119");

    defaultConfig.setProperty("n3tpd.auxport", "8080");

    defaultConfig.setProperty("n3tpd.server.backlog", "10");

    defaultConfig.setProperty("n3tpd.hostname", "localhost");

    defaultConfig.setProperty("n3tpd.storage.database", "jdbc:mysql://localhost/n3tpd_data");

    defaultConfig.setProperty("n3tpd.storage.dbmsdriver", "com.mysql.jdbc.Driver");

    defaultConfig.setProperty("n3tpd.storage.user", "n3tpd_user");

    defaultConfig.setProperty("n3tpd.storage.password", "mysecret");

    instance = new Config();

  }

  /**

   * @return A Config instance

   */

  public static Config getInstance()

  {

    return instance;

  }

  // Every config instance is initialized with the default values.

  private Properties settings = (Properties)defaultConfig.clone();

  /**

   * Config is a singelton class with only one instance at time.

   * So the constructor is private to prevent the creation of more

   * then one Config instance.

   * @see Config.getInstance() to retrieve an instance of Config

   */

  private Config()

  {

    try

    {

      // Load settings from file

      load();

    }

    catch(IOException e)

    {

      e.printStackTrace();

    }

  }

  /**

   * Loads the configuration from the config file. By default this is done

   * by the (private) constructor but it can be useful to reload the config

   * by invoking this method.

   * @throws IOException

   */

  public void load() throws IOException

  {

    try

    {

      settings.load(new FileInputStream(FILE));

    }

    catch (FileNotFoundException e)

    {

      save();

    }

  }

  /**

   * Saves this Config to the config file. By default this is done

   * at program end.

   * @throws FileNotFoundException

   * @throws IOException

   */

  public void save() throws FileNotFoundException, IOException

  {

    settings.store(new FileOutputStream(FILE), "N3TPD Config File");

  }

  /**

   * Returns the value that is stored within this config

   * identified by the given key. If the key cannot be found

   * the default value is returned.

   * @param key Key to identify the value.

   * @param def The default value that is returned if the key

   * is not found in this Config.

   * @return

   */

  public String get(String key, String def)

  {

    return settings.getProperty(key, def);

  }

  /**

   * Returns the value that is stored within this config

   * identified by the given key. If the key cannot be found

   * the default value is returned.

   * @param key Key to identify the value.

   * @param def The default value that is returned if the key

   * is not found in this Config.

   * @return

   */

  public int get(String key, int def)

  {

    try

    {

      String val = get(key);

      return Integer.parseInt(val);

    }

    catch(Exception e)

    {

      return def;

    }

  }

  /**

   * Returns the value that is stored within this config

   * identified by the given key. If the key cannot be found

   * the default value is returned.

   * @param key Key to identify the value.

   * @param def The default value that is returned if the key

   * is not found in this Config.

   * @return

   */

  public long get(String key, long def)

  {

    try

    {

      String val = get(key);

      return Long.parseLong(val);

    }

    catch(Exception e)

    {

      return def;

    }

  }

  /**

   * Returns the value for the given key or null if the

   * key is not found in this Config.

   * @param key

   * @return

   */

  private String get(String key)

  {

    return settings.getProperty(key);

  }

  /**

   * Sets the value for a given key.

   * @param key

   * @param value

   */

  public void set(String key, String value)

  {

    settings.setProperty(key, value);

  }

}