/*
 * Author: Wenbing Zhao
 * Last Modified: 9/18/2006
 * For EEC484/584 Project 1
 */

import java.io.*; 
  
public class ParSender extends DataLinkLayer{ 
    public static final int RECEIVER_PORT = 9888;
    public static final int SENDER_PORT = 9887;

    public ParSender(PhysicalLayer pl) {
	super(pl);
    }

    public void run() {
	int nextFrameToSend;
	Frame frame = new Frame();
	Packet packet = new Packet();
	
	nextFrameToSend = 0;
	getPacketToSend(packet);

	while(true) {
	    // To be completed
	    // populate the frame fields

	    sendFrameToPhysicalLayer(frame);
	    m_wakeup = false;

	    // To be completed

	    int event = waitForEvent();
	    if(EVENT_FRAME_ARRIVAL == event) {
		frame = receiveFrameFromPhysicalLayer();
		
		// To be completed
	    }
	}
    }

    // To be modified
    // We get packet to send from stdin
    void getPacketToSend(Packet packet) {
	System.out.println("Please enter a message to send: ");
	try {
	    BufferedReader inFromUser = 
		new BufferedReader(new InputStreamReader(System.in)); 
	    String sentence = inFromUser.readLine(); 
	    byte[] sendData = sentence.getBytes();         
	    System.out.println("Sending: "+sentence);
	    packet.length = sendData.length;
	    packet.payload = sendData;
	} catch(Exception e) {
	    System.out.println("IO error: "+e);
	}
    }

    public static void main(String args[]) throws Exception { 
	PhysicalLayer pl = new PhysicalLayer(SENDER_PORT, RECEIVER_PORT);
	ParSender sender = new ParSender(pl);
	pl.setDataLinkLayer(sender);
	sender.run();
    } 
}