package MV3500Cohort2018JulySeptember.homework1;

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

/**
 * Very slightly more complex than example1. The only thing this does
 * differently is introduce a loop into the response, so you don't
 * have to restart the program after one response. Also, it prints
 * out the socket pair the server sees. Run the program via telnet
 * several times and compare the socket pairs.
 * 
 * telnet localhost 2317-2326
 * 
 * If you're sophisticated you can contact the instructor's computer
 * while running this program.
 * 
 * telnet ipOfServersLaptop 2317
 * telnet ipOfServersLaptop 2318
 * telnet ipOfServersLaptop 2319
 * telnet ipOfServersLaptop 2320
 * telnet ipOfServersLaptop 2321
 * telnet ipOfServersLaptop 2322
 * telnet ipOfServersLaptop 2323
 * telnet ipOfServersLaptop 2324
 * telnet ipOfServersLaptop 2325
 * telnet ipOfServersLaptop 2326
 * 
 * And have him display the socket pairs he got.
 * @author mcgredo
 */
public class FurrAssignment2 
{
    /**
     * Default constructor to silence javadoc warning
     * @see <a href="https://stackoverflow.com/questions/4488716/java-default-constructor" target="_blank">StackOverflow: Java default constructor</a>
     */
    public FurrAssignment2 ()
    {
        // default initializations occur here
    }
    /** run the program
     * @param args command-line arguments, string parameters (unused) */
    public static void main(String[] args)
    {
        try
        {
            // ServerSocket waits for a connection from a client. 
            // Notice that it is outside the loop; ServerSocket
            // needs to be made only once.
			ServerSocket[] serverSocket = new ServerSocket[10];  // created an array for 10 ports to be open
			int connectionCount = 0; // state
			int j = 0; //number of ports to open
            for(int i=2317; j<10; i++){
				serverSocket[j] = new ServerSocket(i);  //open the ports
				System.out.println("server established for port # " +i +" in Array slot " +j);  
				j++;
			}
			j=0; 
            // Loop, infinitely, waiting for client connections.
            // Stop the program somewhere else.
			Socket clientConnections[] = new Socket[10];  //not used, but wanted to create connections.
			//clientConnections[j] = serverSocket[j].accept();
			//Socket clientConnection;
			boolean wait = true;  //not used, tried to find a way to see what port had a pending connection
			
            while(true)
            {
				//Loop to look for the port that is being connected to, can't find the variable or bool to see what is pending connection
//				while(wait)
//				{
//					for(int i =0; i<10; i++){
//						int z = 2317;
//						if(serverSocket[i].isClosed()){
//						//try(
//								Socket clientConnection = serverSocket[i].accept();
//								//)
//							z++;
//							wait=false;
//							return;
//						}
//					}
//				}
//				for(int i=0; i<10; i++){
//					if(serverSocket[i].isClosed())
//						j=i;
//				}
										
				try (
					
						Socket clientConnection = serverSocket[j].accept(); // blocks! then proceeds once a connection is "accept"ed  //will only follow on for port 2317 since that is in slot 0 in the array
						
				) 
				
				{
					
					
					connectionCount++; // got another one!
					
					OutputStream os = clientConnection.getOutputStream();
					PrintStream ps = new PrintStream(os);
					
					ps.println("This client response was written by server FurrAssignment2"); // to remote client  //Changed name
					System.out.println("This server response was written by server FurrAssignment2"); // to server console  // Changed name
					
					// Print some information locally about the Socket
					// connection. This includes the port and IP numbers
					// on both sides (the socket pair.)
					
					InetAddress localAddress = clientConnection.getLocalAddress();
					InetAddress remoteAddress = clientConnection.getInetAddress();
					
					int localPort = clientConnection.getLocalPort();
					int remotePort = clientConnection.getPort();
					
					// My socket pair connection looks like this, to localhost:
					// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
					// Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
					//
					// Why is the first IP/port the same, while the second set has
					// different ports?
					
					
					System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " +
							remoteAddress.toString() + ", " + remotePort + " ))");
					
					System.out.println("got another connection, #" + connectionCount); // report progress
					j++;
					// Notice the use of flush() and close(). Without
					// the close() to Socket object may stay open for
					// a while after the client has stopped needing this
					// connection. Close() explicitly ends the connection.
					ps.flush();
				} // got another one!
            }
       }
        catch(Exception e)
        {
            System.out.println("problem with networking: " + e);
        }
       
    }
    
}