ceng320assignment4

import java.io.*;
import java.util.*;
import java.lang.*;
import java.net.*;
// Essential Libraries
/**
 *
 * @author Deo Anthony Madrid
 */
public class main{

    String helpMenu(String [] tokens)
    {
	int tokenSize = tokens.length;
	// Help menu for specified token
		String [] cmd = new String[tokenSize];
		String [][] helpArray = new String[][] {

			{"help", "\r\n help gives you a description of the specified command.\n"},
            {"time", "\r\n time gives you the current UNIX time from a UDP based server.\n"},
            {"rand", "\r\n rand gives you a randum number generated from a TCP based server.\n"},
            {"dict", "\r\n dict gives you a detailed description of a phrase/word.\n"},
            {"exit", "\r\n exit - ends the client session\n"}
        };

		for(int t = 1 ;t < tokenSize; t++){
			if(tokens[t]!=null){
				for(int i=0;i<5;i++){
					if(tokens[t].equals(helpArray[i][0])){
					cmd[t]=helpArray[i][1];
					}
				}
			}
			else{
				break;
			}
			t++;
		}
		if(tokenSize == 1) return "Available commands are: \r\n help \r\n time \r\n rand \r\n dict \r\n exit";
		else
		{
		StringBuffer sb = new StringBuffer();
		for(int s = 1; s < cmd.length; s++) {
			sb.append(cmd[s]);
		}
		String str = sb.toString();
		if(str.equals("null")){
			return("No Help for that Command!");
		}
		else{
		return str;
		}
      // return "This is the help command method";
     }
	}

    String dayTime(String [] args) throws IOException
    {
		// Start a daytime client to connect to server
	System.out.println("UDP DaytimeClient Running");

    String hostname = "localhost";
    int port = 40156;

    InetAddress address = InetAddress.getByName(hostname);
    DatagramSocket socket = new DatagramSocket();

    byte[] buffer = new byte[512];

    DatagramPacket request = new DatagramPacket(buffer, buffer.length, address, port);
    socket.send(request);


    byte[] receive = new byte[66666];
    Date date = new Date();
    String strDate = (date.toString());
    byte[] dateMsg = strDate.getBytes();

    DatagramPacket DpReceive = null;
    DpReceive = new DatagramPacket(receive, receive.length);

    // Step 3 : recieve the data in byte buffer.
    socket.receive(DpReceive);
    System.out.println("Client: " + DpReceive);
	// display time and date using toString()
    receive = new byte[66666];
	return (date.toString());
     // return "This is the time command method";
     }
    String randNum(String [] tokens)
    {
	  int min = 1;
      int max = Integer.parseInt(tokens[1]);

      //Generate random int value from 1 to user specified max
      System.out.println("Random value in int from "+min+" to "+max+ ":");
      int randNum = (int)Math.floor(Math.random()*(max-min+1)+min);
	  String output = Integer.toString(randNum);

      return output;
     }
    String dicT(String [] tokens)
    {
		// To be run on VM with working dict function installed
      ProcessBuilder processBuilder = new ProcessBuilder();

        processBuilder.command("dict",tokens[1]);

        try {

            Process process = processBuilder.start();

            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(process.getInputStream()));

            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            int exitCode = process.waitFor();
            System.out.println("\nExited with error code : " + exitCode);

        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
		return "This is the dict command method";
     }


    main(InputStream in, PrintStream out) throws IOException {
       while(true)
       {
      Scanner scanner=new Scanner(in);
	  String line;
	  String[] tokens;
	  out.print("Enter a cmd: help, time, rand, dict, or exit: ");
	  out.flush();
          while(scanner.hasNextLine()) {
              //Input stream for user input commands
              line=scanner.nextLine();
	      tokens=line.split(" ");
	      switch(tokens[0].toLowerCase())
	      {
                  case "help": out.println(helpMenu(tokens));
				 break;
                  case "time": out.println(dayTime(tokens));
				 break;
                  case "rand": out.println(randNum(tokens));
				 break;
                  case "dict": out.println(dicT(tokens));
				 break;
	              case "exit": out.println("Ending Client Session");
			         System.exit(0);

	          default:  out.println("Bad command: " + tokens[0]);
		}
	      out.print("Next command: ");
              out.flush();
          }

       }
    }


    public static void main(String[] args) throws IOException {
		// Main Method
        new main(System.in,System.out);
    }

}