package lava.net.psyc.packages;

import lava.net.common.UNL;
import lava.net.common.Value;
import lava.net.common.VariableModifier;
import lava.net.psyc.PSYCDeliveryException;
import lava.net.psyc.PSYCMessageCenter;
import lava.net.psyc.PSYCPackage;

/**
 *
 **/
public class AuthenticationServer extends Skeleton 
{
   /**
    *
    **/
   public final static String PackageName = "AuthenticationServer";

   class DummyListener implements AuthenticationServerListener
   {
      /**
       *
       **/
      public void authenticationGotPassword(UNL client, String password)
      {
      }

   }

   /**
    *
    **/
   private AuthenticationServerListener listener = new DummyListener();

   /**
    *
    **/
   public AuthenticationServer(AuthenticationServerListener listener)
   {
      super();
      setPackageName(PackageName);
      addPackageMethod(Authentication.queryPasswordTag,//
      Authentication.queryPasswordAliases,false);
      addPackageMethod(Authentication.setPasswordTag,//
      Authentication.setPasswordAliases,false);
      addPackageMethod(Authentication.errorInvalidPasswordTag,//
      Authentication.errorInvalidPasswordAliases,false);
      addPackageVariable(Authentication.passwordTag,//
      Authentication.passwordAliases,true);
      if(listener != null)
         this.listener = listener;
   }

   /**
    *
    **/
   public boolean understands()
   {
      return !(listener instanceof DummyListener);
   }

   /**
    *
    **/
   public void variableChanged(UNL source, VariableModifier modifier)
   {
      char glyph = modifier.getGlyph();
      String name = modifier.getName();
      if(name.equals(Authentication.passwordTag))
      {
         if(glyph == VariableModifier.GLYPH_SET || //
         glyph == VariableModifier.GLYPH_ASSIGN)
         {
            Value value = modifier.getValue();
            if(value == null)
               return;
            listener.authenticationGotPassword(source,value.toString());
         }
      }
   }

   /**
    *
    **/
   public String getPassword(UNL client)
   {
      Value v = center.getValue(client,Authentication.passwordTag);
      if(v != null)
         return v.toString();
      return null;
   }

   /**
    *
    **/
   public void queryPassword(UNL client, String body) //
   throws PSYCDeliveryException
   {
      center.sendChecked(client,Authentication.PackageName,//
      Authentication.queryPasswordTag,body);
   }

   /**
    *
    **/
   public void queryPassword(UNL client) throws PSYCDeliveryException
   {
      queryPassword(client,null);
   }

   /**
    *
    **/
   public void invalidPassword(UNL client, String body) //
   throws PSYCDeliveryException
   {
      center.sendChecked(client,Authentication.PackageName,//
      Authentication.errorInvalidPasswordTag,body);
   }

   /**
    *
    **/
   public void invalidPassword(UNL client) throws PSYCDeliveryException
   {
      invalidPassword(client,null);
   }

}