import java.lang.*;
import java.io.*;
import java.net.*;

class Server {
   public static void main(String args[]) {
      String welcome = "Welcome! The server is now connected.";
      String login = "Enter username and password: ";
	  String message; 
			  
      try {
    	  //Detecting the localhost's ip address
    	  InetAddress localaddr = InetAddress.getLocalHost();
    	  System.out.println("SERVER\n");
    	  System.out.println ("Local hostnameIP: " + localaddr );
    	  
		 // Creating a server socket for connection
         ServerSocket srvr = new ServerSocket(1234);
		 System.out.println("Waiting for connection on "+localaddr);
		 // Accept incoming connection
		 Socket skt = srvr.accept();
         System.out.print("Server has connected!\n");
         // get Input and Output streams
		 PrintWriter out = new PrintWriter(skt.getOutputStream(), true);
		 out.flush();
		 BufferedReader in = new BufferedReader(new InputStreamReader(skt.getInputStream()));
		 BufferedReader log = new BufferedReader(new InputStreamReader(skt.getInputStream())); //read input for login
         System.out.print("Sending string: '" + welcome + "'\n");
		 out.println(welcome);
		 out.println(login);
		 //out.println(enterUser);
		 
		 
		 //login
		 //out.print("Username: ");
		 String username = in.readLine();
		 System.out.println("Client's username: " + username);
		 
		 //out.print("Password: ");
		 String password = in.readLine();
		 System.out.println("Client's password: " + password);
		 
		 if (username.equals("hello123") && password.equals("mypass")) {
			 out.println("Correct login!");
			 System.out.println ("Client's IP Address: " + localaddr.getHostAddress());
		 }
		 if (!username.equals("hello123")||!password.equals("mypass")) {
			 out.println("Wrong login - server closing");
			 out.close();
	         skt.close();
	         srvr.close();
		 }
		 
		 
		 do {

				message=in.readLine();
				System.out.println("client> "+message);
				if (message.equals("password")){
					out.println("Access Granted");
				}else if (message.equals("bye")){
					out.println("Server closing");
					System.out.println("server> Server closing");
				}
		}while(!message.equals("bye"));
         out.close();
         skt.close();
         srvr.close();
      }catch(BindException e){
  		//e.printStackTrace();
        System.out.print("A server is already running on the same port.");    	  
      }catch(SocketException e) {
		//e.printStackTrace();
        System.out.print("Client has disconnected rudely.");
      }catch(Exception e){
    	  //e.printStackTrace();
          System.out.print(":( Whoops! It didn't work!\n");

      }
   }
   
   

}