import java.io.*;
import java.util.*;


public class ThreadTestMain {

    public static void main(String[] args) {

	boolean help_menu = args.length==1 && 
	    (args[0].equals("help") || args[0].equals("-h"));

	if (args.length==0 || help_menu) {
	    menu();
	    if (help_menu)
		System.exit(1);
	}

	ThreadTest[] ta = new ThreadTest[100];  //runnables
	Thread[] T = new Thread[100];           //threads

	//start some jobs and threads to run them by 
	//based on cmd line args as snooze times in seconds
	int num_threads = args.length;
	int orig_num_threads = num_threads;
	for (int i=0; i<num_threads; i++) {
	    ta[i] = new ThreadTest( Integer.parseInt(args[i])*1000 );
	    T[i] = new Thread( ta[i] );
	    T[i].start();
	}

	//read commands from user
        System.out.println("Enter commands: k #");
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
	char cmd;
	try {
	    do {
		String cmd_line;
		cmd_line = in.readLine();
		//this all has to be in the try block???: else init error if used outside
		if (cmd_line.length()>0) 
		    cmd = cmd_line.charAt(0);
		else
		    cmd = 'h';
		int thread_id, i, new_snooze;
		switch (cmd) {
		case 'k': 
		    thread_id = Integer.parseInt(cmd_line.substring(1).trim());
		    i = findThread(thread_id, ta, num_threads);
		    if (i != -1) {
			ta[i].pleaseStop();
			ta[i] = ta[num_threads-1];  //unordered list
			//deprecated: also, pleaseStop not in Thread error
			//ta[thread_i].stop();   
			num_threads--;
		    }
		    else
			System.out.println("no such thread");
		    break;
		case 'p': 
		    thread_id = Integer.parseInt(cmd_line.substring(1).trim());
		    i = findThread(thread_id, ta, num_threads);
		    if (i != -1) {
			ta[i].pleasePause();
		    }
		    else
			System.out.println("no such thread");
		    break;
		case 'c': 
		    thread_id = Integer.parseInt(cmd_line.substring(1).trim());
		    i = findThread(thread_id, ta, num_threads);
		    if (i != -1) {
			ta[i].pleaseContinue();
		    }
		    else
			System.out.println("no such thread");
		    break;
		case 'u': 
		    StringTokenizer two_ints = 
			new StringTokenizer(cmd_line.substring(1));
		    thread_id =  Integer.parseInt(two_ints.nextToken());
		    try {
			new_snooze = Integer.parseInt(two_ints.nextToken());
		    }
		    catch (NoSuchElementException e) {
			new_snooze = 1000;     //default snooze
		    }
		    //debug:
		    //System.out.println(thread_id+"  "+new_snooze);
		    i = findThread(thread_id, ta, num_threads);
		    if (i != -1) {
			ta[i].updateSnooze(new_snooze);
		    }
		    else
			System.out.println("no such thread");

		    break;
		case 's':
		    try {
			new_snooze =Integer.parseInt(cmd_line.substring(1).trim());
		    }
		    catch (NumberFormatException e) {
			new_snooze = 1000;
		    }
		    ta[num_threads] = new ThreadTest(new_snooze);
		    T[num_threads] = new Thread( ta[num_threads] );
		    T[num_threads].start();
		    num_threads++;
		    break;
		case 'h': menu();
		    break;
		case 'q': break;

		default: System.out.println("unknown command");
		}

	    } while (cmd != 'q');
	}
	//so don't need throws IOException (from readLine) for method
	catch (IOException e) {}

	//kill remaining threads
	int i = 0;
	while (num_threads > 0) {
	    if (ta[i] != null) {
		ta[i].pleaseStop();
		ta[i] = null;
		num_threads--;
	    }
	    i++;
	}
	System.out.println("Main is done");
    }



    private static int findThread(int thread_id, ThreadTest[] ta, int num_threads) {
	int i=0;
	boolean found = false;
	while (i<num_threads && !found)
	    if (ta[i]!=null && ta[i].id==thread_id)
		return i;
	    else
		i++;
	if (!found)
	    return -1;
	else
	    return i;    //complains if not here too?!?!?
    }


    public static void menu() {
	System.out.println("Usage: ThreadTestMain [sleep]+");
	System.out.println("commands:");
	System.out.println("k(ill)   threadID#");
	System.out.println("u(pdate) threadID# [newSnoozeTime=1000]");
	System.out.println("s(tart)  [newSnoozeTime=1000]");
	System.out.println("p(ause)  threadID#");
	System.out.println("c(ontinue) threadID#");
	System.out.println("h(elp) show this menu");
	System.out.println("q(uit)");
    }


}