package Oblig1;


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

class udpklient
{
public static void main(String args[]) throws Exception
	{
	BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
	DatagramSocket clientSocket = new DatagramSocket();
	InetAddress IPAddress = InetAddress.getByName("localhost");
	byte[] sendData = new byte[1024];
	byte[] receiveData = new byte[1024];

	//Filnamn
	System.out.println("Skriv tittel: ");
	String filnamn = inFromUser.readLine();
	sendData = filnamn.getBytes();

	DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, 9876);
	clientSocket.send(sendPacket);

	String fil = "";
	String sekvens = "0";
	String mottattSek = "";
	String modifiedSentence = "";

	boolean ferdig = false;

	while(!ferdig){

		do{
		//Mottar data
		DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
		clientSocket.receive(receivePacket);
		modifiedSentence = new String(receivePacket.getData());

		//Henter sekvensnummer
		mottattSek = modifiedSentence.substring(0,1);
		}while(!mottattSek.equals(sekvens));

		  // Forbered neste sekvensnummer
        if(sekvens.equals("0")){
        	sekvens="1";
        }else{
        	sekvens = "0";
        }

        //Legger til linje til fil
		fil+=modifiedSentence.substring(1);
		//Stopper dersom den når slutten av fila
		if(fil.contains(".")){
			ferdig=true;
		}

		//Klargjer sekvensnummer for sending og sender det
		sendData = sekvens.getBytes();
		DatagramPacket sendSek = new DatagramPacket(sendData, sendData.length, IPAddress, 9876);
		clientSocket.send(sendSek);
	}

	System.out.println("FROM SERVER:" + fil);
	clientSocket.close();
	}
}