package lava.net.psyc.packages;

import java.util.Hashtable;
import lava.net.common.UNL;
import lava.net.common.Value;
import lava.net.psyc.PSYCDeliveryException;
import lava.net.psyc.PSYCMessageCenter;
import lava.net.psyc.PSYCPackage;

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

   /**
    *
    **/
   public final static String passwordTag = "_password";

   /**
    *
    **/
   protected final static String[] passwordAliases = {"password"};

   /**
    *
    **/
   public final static String queryPasswordTag = "_query_password";

   /**
    *
    **/
   protected final static String[] queryPasswordAliases = {"query_password"};

   /**
    *
    **/
   public final static String setPasswordTag = "_set_password";

   /**
    *
    **/
   protected final static String[] setPasswordAliases = {"set_password"};

   /**
    *
    **/
   public final static String errorInvalidPasswordTag = //
   "_error_invalid_password";

   /**
    *
    **/
   protected final static String[] errorInvalidPasswordAliases = //
   {"error_invalid_password"};

   class DummyListener implements AuthenticationListener
   {
      /**
       *
       **/
      public String authenticationGetPassword(UNL server, String body) //
      throws AuthenticationWontGivePasswordException
      {
         return null;
      }

      /**
       *
       **/
      public void authenticationInvalidPassword(UNL server, String body)
      {
      }

   }

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

   /**
    *
    **/
   private Hashtable vars = new Hashtable();

   /**
    *
    **/
   private Hashtable passwordSent = new Hashtable();

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

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

   /**
    *
    **/
   public void received(UNL source, String method, String body)
   {
      // We'll ever get the method name we've registered,
      // even if a submethod were called
      if(errorInvalidPasswordTag.equals(method))
      {
         if(havePasswordSent(source))
         {
            removePasswordSent(source);
            listener.authenticationInvalidPassword(source,body);
         }
      }
      else
         if(queryPasswordTag.equals(method))
         {
            try
            {
               vars.clear();
               vars.put(passwordTag,new Value(//
               listener.authenticationGetPassword(source,body)));
               try
               {
                  center.sendChecked(source,//
                  AuthenticationServer.PackageName,setPasswordTag,null,//
                  vars);
                  addPasswordSent(source);
               }
               catch(PSYCDeliveryException e)
               {
               }
            }
            catch(AuthenticationWontGivePasswordException e)
            {
            // TODO: send some error if we don't want send an password
            }
         }
   }

   /**
    *
    **/
   public boolean havePasswordSent(UNL server)
   {
      return passwordSent.get(server) != null;
   }

   /**
    *
    **/
   public void addPasswordSent(UNL server)
   {
      passwordSent.put(server,server);
   }

   /**
    *
    **/
   public void removePasswordSent(UNL server)
   {
      passwordSent.remove(server);
   }

   /**
    *
    **/
   public void sendPassword(UNL server, String password) //
   throws PSYCDeliveryException
   {
      vars.clear();
      vars.put(passwordTag,new Value(password));
      center.sendChecked(server,AuthenticationServer.PackageName,//
      setPasswordTag,null,vars);
      addPasswordSent(server);
   }

}