package org.pentaho.pac.server.common;

import java.io.File;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.hibernate.util.DTDEntityResolver;
import org.pentaho.pac.server.i18n.Messages;
import org.pentaho.platform.engine.core.system.SystemSettings;
import org.pentaho.platform.util.xml.dom4j.XmlDom4JHelper;

/**
 * Reuse of {@link SystemSettings} where settings are read from <code>resource/config/console.xml</code>.
 * 
 * @author mlowery
 */
public class OpenAdminConsoleSettings extends SystemSettings {

  private static final long serialVersionUID = -5912709145466266140L;
  private static final Log logger = LogFactory.getLog(OpenAdminConsoleSettings.class);
  public static final String DEFAULT_PROPERTIES_FILE_NAME = "console.xml"; //$NON-NLS-1$
  public OpenAdminConsoleSettings() {
    super();
  }

  /**
   * Need to override since default implementation points to solution path (e.g. pentaho-solutions).
   */
  @Override
  protected String getAbsolutePath(String path) {
    try {
      File file = new File(ClassLoader.getSystemResource(path).toURI());
      return file.getAbsolutePath();
    } catch(Exception e) {
      logger.info( Messages.getErrorString("AppConfigProperties.ERROR_0009_UNABLE_TO_GET_ABSOLUTE_PATH", path, e.getLocalizedMessage())); //$NON-NLS-1$
      return "resource/config/" + path; //$NON-NLS-1$  
    }
  }

  /**
   * Need to override since default implementation points to pentaho.xml.
   */
  @Override
  public String getSystemSetting(final String settingName, final String defaultValue) {
    return getSystemSetting(DEFAULT_PROPERTIES_FILE_NAME, settingName, defaultValue);
  }

  /**
   * Need to override to stop caching behavior. Caching is disabled to allow this object to see changes to
   * the console.xml file that are made by other objects.
   */
  @Override
  public Document getSystemSettingsDocument(final String actionPath) {
    
    File f = new File(getAbsolutePath(actionPath));
    if (!f.exists()) {
      return null;
    }
    Document systemSettingsDocument = null;

    try {
      systemSettingsDocument = XmlDom4JHelper.getDocFromFile(f, new DTDEntityResolver());
    } catch (DocumentException e) {
      logger.error(e);
    } catch (IOException e) {
      logger.error(e);
    }

    return systemSettingsDocument;
  }

}