/***********************************/
/*	     Client.java	   */
/*	     main part		   */
/*				   */
/***********************************/

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

class Client
{ 
	public static void main(String a[]) 
		throws SocketException, IOException
	{ 
	        String	host = new String("");  //soccer server Name.
		int	port = 6000;            //default port number.
		int     m_port;                 //port after connected to server.
		InetAddress    m_host;
		String   team = new String("Nippon"); //team name.
		DatagramSocket socket;

		char           side;    // side{left, right}
		int            iside;   // 1 = left side, -1 = right side
		int            p_no;    // player number

		try
		{								 
			for( int c = 0 ; c < a.length ; c += 2 ) 
			{ 
				if( a[c].compareTo("-h") == 0 ) 
					host = a[c+1];
				else if( a[c].compareTo("-p") == 0 )
					port = Integer.parseInt(a[c+1]);
				else if( a[c].compareTo("-t") == 0 )
                                        team  = a[c+1];
                                else
                                        throw new Exception();
			}  
		} 
		catch(Exception e)      
		{ 
       			System.err.println("");
         		System.err.println("USAGE:  [-parameter value]");
         		System.err.println("");
      			System.err.println("  Parameters  value        default");
			System.err.println(" ------------------------------------");
      			System.err.println("  h        host_name    localhost");
      			System.err.println("  port        port_number  6000");
      			System.err.println("  team        team_name    Nippon");
      			System.err.println("");
         		System.err.println("  Example:");
      			System.err.println("  agent -h ***.&&&.ac.jp -p 6000 -t Japan");
         		System.err.println("    or");
         		System.err.println("   agent -h 157.110.**.***");
     			return;
		} 
		/* send init command to[ host port] */
		socket = new DatagramSocket(); 
	        m_host = InetAddress.getByName(host);
		String s = "(init " + team + ")"; 
                // version control string is "(init " + team + "(version 4.00))".
		byte[] send_data = new byte[s.length()];
		send_data = s.getBytes();
		try{
			DatagramPacket p_out = 
			new DatagramPacket(send_data, send_data.length, m_host, port);
			socket.send(p_out);			
		}
		catch (Exception e){
			System.err.println(e);
		}
		// recieve the first reply from the soocer server. 
		// it contains side and player number from "(init l 8 before_kick_off)".
 
		int MAX_LENGTH = 1028;  /* message buffer length */
		byte[] buffer = new byte[MAX_LENGTH];
		byte[] data = new byte[MAX_LENGTH];
		try{
			DatagramPacket p_in = new DatagramPacket(buffer, buffer.length);			
			socket.receive(p_in);
			data = p_in.getData();
			String message = new String(data, 0, p_in.getLength());
			System.out.println("received on port =" + p_in.getPort());
			System.out.println("received message =" + message);
			m_port = p_in.getPort();    // after "init", use port[xxxx] recieved packet.
			System.out.println("retruned port n#  =" + m_port);

			// parse reply from SoccerServer.
			StringTokenizer tokenizer = new StringTokenizer(message,"() ");
			if( tokenizer.nextToken().compareTo("init") != 0)
			    throw new IOException(message);
			side = tokenizer.nextToken().charAt(0);
			p_no = Integer.parseInt(tokenizer.nextToken());
			System.out.println("side & player-number = " + side + p_no);
		}
		catch (Exception e){
			System.err.println(e);
		}		
		
	}
}