import java.net.* ;
import java.io.* ;
import java.util.* ;

class ConnectionWaiter  extends ServerSocket {
    	
   ConnectionWaiter(int socket)throws Exception{
     super(socket) ;
     }   

   Socket connected()throws Exception{
   return super.accept()  ;
     }
   
   void closeConnection()throws Exception  {super.close ();}
   
   }

class Connection extends Thread {
Socket s;
Vector v;
BufferedReader in;
PrintWriter out;
String nimi ;
User loser;
	
Connection(Socket s ,Vector v ){ this.s=s ;this.v=v ; initIOStreams(); start(); }

void initIOStreams(){
	try{
		in=new BufferedReader (new InputStreamReader (s.getInputStream ()));
		out=new PrintWriter (s.getOutputStream (),true) ;
	    }catch(Exception e){}
   }

public void run(){
	this.begin();
	this.justTalk();
try{
	s.close ();	}catch(Exception e){ }
    }

void begin(){
	try{	
out.println ("");
Date d=new Date ();
out.println ("");
out.println (d.toString  ().substring (0,20));
out.println ("Sisesta kasutajanimi :");
while(true){
	nimi=in.readLine ().toLowerCase ();
    if ((nimi.equals ("")))out.println ("Vigane kasutajanimi :") ;
	else if (this.isUserName (nimi)) out.println ("See nimi on juba kasutusel");
	else
	break ;	
	
}
loser=new User (nimi,s);
v.addElement (loser);
out.println ("Tere "+nimi+" !");
out.println ("");
	}catch(Exception e){out.println ("ei saa lugeda !") ;}
   }

void justTalk(){
	String  fromK;
	//loeb kuni kasutaja ei ole tillinud .
read:	while(true){
		try{
	  fromK=in.readLine ();
	  if(fromK.toLowerCase ().equals (".quit")) {  break  read ;} 
	  if(fromK.toLowerCase ().equals (".list")){this.getList() ; continue ;  }
	  if(fromK.toLowerCase ().equals (".privateto")) { myPrivateLine()  ; continue ;} 
	  // kill Enum ;
	    
	 /* for(Enumeration e=v.elements ();e.hasMoreElements ();   )	{
			if ((User)(e.nextElement ())==loser) { continue ; }
			else{
			Socket now=((User)(e.nextElement ())).getSocket ()  ;
			PrintWriter print_out=new PrintWriter (now.getOutputStream (),true);
			print_out.println (nimi+" :>"+fromK);
			   }//if lopp <<>>      
			}// for lõpp <<>>
			*/
    	int j;	
		for(j=0;j<v.size ();j++  )	{
			if ((User)(v.elementAt (j))==loser) { continue ; }
			else{
			Socket now=((User)(v.elementAt (j))).getSocket ()  ;
			PrintWriter print_out=new PrintWriter (now.getOutputStream (),true);
			print_out.println (nimi+" :>"+fromK);
			   }//if lopp <<>>      
			}// for lõpp <<>>
	
	                   // otsepöörduse lopp	
		}catch(Exception e){}
	    }////while lopp <<>>
		v.removeElement (loser);
     }

void myPrivateLine() throws Exception {
	out.println ("Kellega koneleks ?");
	String partner;
     partner =in.readLine ().toLowerCase ();
	if(!this.isUserName(partner)){out.println ("Pole sellist kasutajat !");}
	else
	{ try{
      User myLine=this.getUser (partner);	
	  PrintWriter print_out=new PrintWriter (myLine.getSocket().getOutputStream (),true  ) ;
	  while(true){
	  String transs=in.readLine ();
	  if(transs.toLowerCase ().equals (".killpr")){ break ;}
	  print_out.println ("PRIVATE "+nimi+" :>"+transs);}
	   }catch(Exception e){}
	}	
 }

 User getUser(String name){
		int i ;
		User user=null;
		User out;
		for (i=0;i<v.size ();i++){
			out=(User)(v.elementAt (i));
		if (out.getUID ().toLowerCase ().equals (name.toLowerCase ()))
		   user=out ;
		         }
		return user;
	      }

	 boolean isUserName(String name){
		boolean out=false ;
		int i ;
		for (i=0;i<v.size ();i++){
		if (((User)(v.elementAt (i))).getUID ().toLowerCase ().equals (name.toLowerCase ()))
		out=true ;
		      }
		return out;
		      }

void getList(){
/*	for (Enumeration e=v.elements ();e.hasMoreElements (); ){
		if ((User)(e.nextElement ())==loser) { continue ;  }
		    else
		out.println (((User)(e.nextElement ())).getUID ());
	} 
*/	
	int i=0;
	for ( ; i<v.size (); i++ ){
		if ((User)(v.elementAt (i))==loser) {  continue ;}
		    else
		out.println (((User)(v.elementAt (i))).getUID ());
	             } 
		  }
}

public class Chat{
	Vector users;
	ConnectionWaiter waiter;
    int PORT=5001 ;
	
	Chat()throws Exception {
		try{	
	users=new Vector ();
	waiter=new ConnectionWaiter(PORT);
	while(true){
		    Socket new_user=waiter.connected();
			new Connection (new_user,users);		
		}
	     
		}catch(Exception e){System.out .println ("Viga tekkimisel !");}
		waiter.closeConnection ();
	}
	
	public static void main(String args[]) throws Exception {
     new Chat ();		
	}
}

class User{
	String UID;
	Socket us ;
	User(String UID, Socket us  ){
	this.UID =UID ;  this.us =us ;
	}
	
	String getUID(){
	return UID ;
	}
	
	Socket getSocket(){
	return us ;
	}
}