/*
 * Created on 2004-11-27
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package chatserver;

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import chat.ChatServer;
import chat.Chatter;

/**
 * @author Lance
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class ChatServerImpl 
	extends java.rmi.server.UnicastRemoteObject
	implements ChatServer{
	
	/**
	 * @throws RemoteException
	 */
	protected ChatServerImpl() throws RemoteException {
		super();
		// TODO Auto-generated constructor stub
	}

	static ChatServerImpl server=null;
	private static final String BINDNAME="ChatServer";
	private static final String[] STATEMSG=
		new String[]{"服務器啟動", "服務器停止"};
	List chatters=new ArrayList();
	List listeners=new ArrayList();
	
	//獲得ChatServerImpl對象
	public static ChatServerImpl getInstance(){
		try{
			if (server==null)
				server=new ChatServerImpl();
		}catch(RemoteException e){
			e.printStackTrace();
			return null;
		}
		return server;
		
	}
	
	public void start()throws RemoteException,MalformedURLException{
		Naming.rebind(BINDNAME, server);
		notifyListener(STATEMSG[0]);
	}
	
	public void stop()
	throws RemoteException,NotBoundException,MalformedURLException{
		notifyListener(STATEMSG[1]);
		Iterator itr=chatters.iterator();
		
		while(itr.hasNext()){
			UserInfo u=(UserInfo)itr.next();
			u.getChatter().serverStop();
		}
		
		Naming.unbind(BINDNAME);
	}
	
	//添加一個Listener
	public void addListener(ChatServerListener listener){
		listeners.add(listener);
	}
	
	//移除一個Listener
	public void removeListener(ChatServerListener listener){
		listeners.remove(listener);
	}
	
	//通知所有Listener事件發生
	void notifyListener(String msg){
		Iterator itr=listeners.iterator();
		ChatServerEvent evt=new ChatServerEvent(this,msg);
		
		while(itr.hasNext()){
			((ChatServerListener)itr.next()).serverEvent(evt);
		}
	}


	/* (non-Javadoc)
	 * @see chat.ChatServer#login(java.lang.String, chat.Chatter)
	 */
	public void login(String name, Chatter chatter) throws RemoteException {
		// TODO Auto-generated method stub
		if(chatter!=null && name!=null){
			
			UserInfo u=new UserInfo(name,chatter);
			notifyListener(u.getName()+"進入聊天室");
			Iterator itr=chatters.iterator();
			
			while(itr.hasNext()){
				
				UserInfo u2=(UserInfo)itr.next();
				u2.getChatter().receiveEnter(name,chatter,false);
				chatter.receiveEnter(u2.getName(),u2.getChatter(),true);
			}
			chatters.add(u);
			
		}
	}


	/* (non-Javadoc)
	 * @see chat.ChatServer#logout(java.lang.String)
	 */
	public void logout(String name) throws RemoteException {
		// TODO Auto-generated method stub
		if(name==null){
			
			System.out.println("null name on logout:cannot remove chatter");
			return;
		}
		
		UserInfo u_gone=null;
		Iterator itr=null;
		
		synchronized(chatters){
			for(int i=0; i<chatters.size(); i++){
				
				UserInfo u=(UserInfo)chatters.get(i);
				
				if(u.getName().equals(name)){
					
					notifyListener(name+"離開聊天室");
					u_gone=u;
					chatters.remove(i);
					itr=chatters.iterator();
					break;
				}
			}
		}
		
		if(u_gone==null || itr==null){
			System.out.println(
					"no user by name of "+name+" found: not removing chatter");
			return;
		}
		
		while(itr.hasNext()){
			
			UserInfo u=(UserInfo)itr.next();
			u.getChatter().receiveExit(name);
		}

	}
	

	/* (non-Javadoc)
	 * @see chat.ChatServer#chat(java.lang.String, java.lang.String)
	 */
	public void chat(String name, String message) throws RemoteException {
		// TODO Auto-generated method stub
		Iterator itr=chatters.iterator();
		
		while(itr.hasNext()){
			
			UserInfo u=(UserInfo)itr.next();
			if(!name.equals(u.getName()))
				u.getChatter().receiveChat(name, message);
		}
		notifyListener(name+":"+message);
		
	}
	
}//END CLASS