/*
 * Copyright 2009-2012 by KNURT Systeme (http://www.knurt.de)
 *
 * Licensed under the Creative Commons License Attribution-NonCommercial-ShareAlike 3.0 Unported;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://creativecommons.org/licenses/by-nc-sa/3.0/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.knurt.fam.connector;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.PropertyResourceBundle;

import de.knurt.fam.core.aspects.logging.FamLog;

/**
 * container for all config vars
 * 
 * @author Daniel Oltmanns
 * @since 1.21 (09/29/2010)
 */
class FamConfig {

  private Properties globalProperties;
  private String configDirectory = null;
  /** one and only instance of FamConnector */
  private volatile static FamConfig me;

  public static FamConfig getInstance() {
    return getInstance("/opt/knurt/fam", false);
  }

  /**
   * return the one and only instance of FamConnector
   * 
   * @return the one and only instance of FamConnector
   */
  public static FamConfig getInstance(String configDirectory, Boolean isTest) {
    if (me == null) {
      // ↖ no instance so far
      synchronized (FamConnector.class) {
        if (me == null) {
          // ↖ still no instance so far
          // ↓ the one and only me
          me = new FamConfig(configDirectory, isTest.booleanValue());
        }
      }
    }
    return me;
  }

  protected String getConfigDirectory() {
    return configDirectory;
  }

  private FamConfig(String configDirectory, boolean isTest) {
    FamLog.info("use config dir: " + configDirectory, 201111061912l);
    this.configDirectory = configDirectory;
    if (this.globalProperties == null) {
      this.globalProperties = new Properties();
      try {
        String configFile = configDirectory + System.getProperty("file.separator") + "config" + System.getProperty("file.separator") + (isTest ? "fam_global_test.conf" : "fam_global.conf");
        PropertyResourceBundle p = new PropertyResourceBundle(new FileInputStream(configFile));
        for (String key : p.keySet()) {
          this.globalProperties.put(key, p.getString(key));
        }
      } catch (IOException ex) {
        FamLog.exception(ex, 201111041300l);
      }
    }
  }

  protected String getGlobalProperty(String key) {
    return this.globalProperties.getProperty(key);
  }

  protected Properties getGlobalProperties() {
    return globalProperties;
  }

  /**
   * Return true, if this is the development environment.
   * 
   * @return true, if this is the development environment.
   */
  protected final boolean isDev() {
    return this.propertyValueEquals("env_dev", "true");
  }

  private boolean propertyValueEquals(String key, String value) {
    return this.getGlobalProperty(key) != null && this.getGlobalProperty(key).equalsIgnoreCase(value);
  }

  protected boolean isPreview() {
    return this.propertyValueEquals("env_preview", "true");
  }
}