package uk.org.ury.show.viewer;

import java.util.List;

import uk.org.ury.config.ConfigReader;
import uk.org.ury.database.DatabaseDriver;
import uk.org.ury.database.UserClass;
import uk.org.ury.database.exceptions.MissingCredentialsException;
import uk.org.ury.database.exceptions.QueryFailureException;
import uk.org.ury.frontend.AbstractFrontendModule;
import uk.org.ury.frontend.FrontendMaster;
import uk.org.ury.frontend.FrontendModulePanel;
import uk.org.ury.frontend.exceptions.UICreationFailureException;

import uk.org.ury.show.ShowChannel;
import uk.org.ury.show.ShowUtils;
import uk.org.ury.show.item.ShowItem;


/**
 * Frontend module for viewing show details.
 * 
 * This serves as the base for the show playout and editor classes,
 * but can be used stand-alone as an (admittedly rather pointless) 
 * module.
 * 
 * @author  Matt Windsor
 *
 */

public class ShowViewer extends AbstractFrontendModule
{
  /**
   * 
   */
  
  private static final long serialVersionUID = -2782366476480563739L;
  private DatabaseDriver dd;
  private ShowChannel[] channels;
  private ShowViewerPanel panel;
  private ConfigReader config;
  
  
  /**
   * Construct a new ShowViewer as a frontend object.
   */
  
  public
  ShowViewer ()
  {
    channels = new ShowChannel[ShowUtils.NUM_CHANNELS];
  }
  
  
  /**
   * Run the library viewer frontend.
   */
  
  @Override
  public FrontendModulePanel
  runFrontend (FrontendMaster master)
  { 
    dd = null;
    config = null;
    
    try
    {
      config = new ConfigReader (master.getResourceDirectory () + "conf.xml");
    }
    catch (MissingCredentialsException e)
    {
      System.out.println(e);
    }
  
    
    
    try
      {
        dd = new DatabaseDriver (config, UserClass.READ_ONLY);
      }
    catch (MissingCredentialsException e)
      {
        // TODO: Privilege de-escalation
        master.fatalError (e.getMessage ());
      }
    catch (Exception f)
      {
        master.fatalError (f.getMessage ());
      }
    
    for (int i = 0; i < channels.length; i++)
      {
        channels[i] = new ShowChannel ();
        
        try
          {
            for (ShowItem item : ShowUtils.getChannelList (dd, 4696, i))
              {
                channels[i].add (item);
              }
          }
        catch (QueryFailureException e)
          {
            master.fatalError (e.getMessage ());
          }
      }
    
    try
      {
        panel = new ShowViewerPanel (this, master);
      }
    catch (UICreationFailureException e)
      {
        master.fatalError (e.getMessage ());
      }
    
    return panel;
  }


  /**
   * @return  the channel array.
   */
  
  public ShowChannel[]
  getChannels ()
  {
    // TODO Auto-generated method stub
    return channels;
  }

  
  /**
   * @return  the list of bin names.
   * 
   * @throws  QueryFailureException if the underlying database query
   *          fails.
   */

  public List<String>
  getBins () throws QueryFailureException
  {
    return ShowUtils.getPublicFolders (dd);
  }
}