/*

 *   SONEWS 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 org.sonews.daemon;

import org.sonews.util.Log;

import java.sql.SQLException;

import org.sonews.daemon.storage.Database;

import org.sonews.util.AbstractConfig;

import org.sonews.util.TimeoutMap;

/**

 * Provides access to the program wide configuration that is stored within

 * the server's database.

 * @author Christian Lins

 * @since sonews/0.5.0

 */

public final class Config extends AbstractConfig

{

  /** Config key constant. Value is the maximum article size in kilobytes. */

  public static final String ARTICLE_MAXSIZE   = "sonews.article.maxsize";

  /** Config key constant. Value: Amount of news that are feeded per run. */

  public static final String FEED_NEWSPERRUN   = "sonews.feed.newsperrun";

  public static final String FEED_PULLINTERVAL = "sonews.feed.pullinterval";

  public static final String HOSTNAME          = "sonews.hostname";

  public static final String PORT              = "sonews.port";

  public static final String TIMEOUT           = "sonews.timeout";

  public static final String MLPOLL_DELETEUNKNOWN = "sonews.mlpoll.deleteunknown";

  public static final String MLPOLL_HOST       = "sonews.mlpoll.host";

  public static final String MLPOLL_PASSWORD   = "sonews.mlpoll.password";

  public static final String MLPOLL_USER       = "sonews.mlpoll.user";

  public static final String MLSEND_ADDRESS    = "sonews.mlsend.address";

  public static final String MLSEND_RW_FROM    = "sonews.mlsend.rewrite.from";

  public static final String MLSEND_RW_SENDER  = "sonews.mlsend.rewrite.sender";

  public static final String MLSEND_HOST       = "sonews.mlsend.host";

  public static final String MLSEND_PASSWORD   = "sonews.mlsend.password";

  public static final String MLSEND_PORT       = "sonews.mlsend.port";

  public static final String MLSEND_USER       = "sonews.mlsend.user";

  public static final String[] AVAILABLE_KEYS = {

    Config.ARTICLE_MAXSIZE,

    Config.FEED_NEWSPERRUN,

    Config.FEED_PULLINTERVAL,

    Config.HOSTNAME,

    Config.MLPOLL_DELETEUNKNOWN,

    Config.MLPOLL_HOST,

    Config.MLPOLL_PASSWORD,

    Config.MLPOLL_USER,

    Config.MLSEND_ADDRESS,

    Config.MLSEND_HOST,

    Config.MLSEND_PASSWORD,

    Config.MLSEND_PORT,

    Config.MLSEND_RW_FROM,

    Config.MLSEND_RW_SENDER,

    Config.MLSEND_USER,

    Config.PORT,

    Config.TIMEOUT

  };

  private static Config instance = new Config();

  public static Config getInstance()

  {

    return instance;

  }

  private final TimeoutMap<String, String> values 

    = new TimeoutMap<String, String>();

  private Config()

  {

    super();

  }

  /**

   * Returns the config value for the given key or the defaultValue if the

   * key is not found in config.

   * @param key

   * @param defaultValue

   * @return

   */

  public String get(String key, String defaultValue)

  {

    try

    {

      String configValue = values.get(key);

      if(configValue == null)

      {

        configValue = Database.getInstance().getConfigValue(key);

        if(configValue == null)

        {

          return defaultValue;

        }

        else

        {

          values.put(key, configValue);

          return configValue;

        }

      }

      else

      {

        return configValue;

      }

    }

    catch(SQLException ex)

    {

      Log.msg(ex.getMessage(), false);

      return defaultValue;

    }

  }

  /**

   * Sets the config value which is identified by the given key.

   * @param key

   * @param value

   */

  public void set(String key, String value)

  {

    values.put(key, value);

    try

    {

      // Write values to database

      Database.getInstance().setConfigValue(key, value);

    }

    catch(SQLException ex)

    {

      ex.printStackTrace();

    }

  }

}