/**
 * Starter code for the Sandwich Shop Problem
  */
 import java.util.concurrent.Semaphore;
public class SandwichShopStarter {
    //DECLARE YOUR STATIC SEMAPHORES HERE
	 private static Semaphore sema1 = new Semaphore(0);
	 private static Semaphore sema2 = new Semaphore(0);
	 private static int employee = 0;
	 private static int customer = 0;

    public static void main(String[] args) {
        if (args.length != 1) {
            printUsage();
        }

        int num = 0;
        try {
            num = Integer.parseInt(args[0]); // number of Customers
        }
        catch (NumberFormatException e) {
            printUsage();
        }

        //INITIALIZE THE SEMAPHORES HERE THINK IF THEY START AT 0 OR 1

        System.out.println("Customer:\t\t\t\t\t\t\t\t\t\t\t| Employee:");
        System.out.print("Traveling\tArrived\t\tOrdering\tBrowsing\tAt Register\tLeaving");
        System.out.println("\t\t| Waiting\tSandwich Making\t\tAt Register\tPayment Accepted");
        System.out .println("---------------------------------------------------"
                        + "---------------------------------------------+--------"
                        + "-------------------------------------------------------------------");

        Thread emp = new EmployeeThread();
        emp.start();

        Thread[] custs = new Thread[num];
        for (int i = 0; i < num; i++) {
            custs[i] = new CustomerThread(i);
            custs[i].start();
        }
        for (int i = 0; i < num; i++) {
            try {
                custs[i].join();
            }
            catch (InterruptedException e) {
            }
        }

        System.exit(0);
    }

    private static void printUsage() {
        System.out.println("Usage: java SandwichShop <num>");
        System.out.println("  <num>: Number of customers.");
        System.exit(-1);
    }

    public static void randomSleep(int max) {
        try {
            Thread.sleep((int) (Math.random() * max));
        }
        catch (InterruptedException e) {
        }
    }

private static class CustomerThread extends Thread {

    private int id;
    public CustomerThread(int id) {
        this.id = id;
    }
    public void run() {
    //HERE you add the acquire and release of the semaphore
        travelToShop();

        arriveAtShop();
        placeOrder();
        sema1.release();
        browseShop();
 	    try {sema2.acquire();} catch(InterruptedException e){}
        atRegister();
        sema1.release();
 	    try {sema2.acquire();} catch(InterruptedException e){}
        leaveShop();


    }

    private void travelToShop() {
        System.out.println("Customer " + id + "\t\t\t\t\t\t\t\t\t\t\t|");
        SandwichShopStarter.randomSleep(1000);
    }
    private void arriveAtShop() {
        System.out.println("\t\tCustomer " + id + "\t\t\t\t\t\t\t\t\t|");
    }
    private void placeOrder() {
        System.out.println("\t\t\t\tCustomer " + id + "\t\t\t\t\t\t\t|");
    }
    private void browseShop() {
        System.out.println("\t\t\t\t\t\tCustomer " + id + "\t\t\t\t\t|");
        SandwichShopStarter.randomSleep(1000);
    }

    private void atRegister() {
        System.out.println("\t\t\t\t\t\t\t\tCustomer " + id + "\t\t\t|");
    }

    private void leaveShop() {
        System.out.println("\t\t\t\t\t\t\t\t\t\tCustomer " + id + "\t|");
    }
}

private static class EmployeeThread extends Thread {

    public void run() {
        //HERE you add the acquire and release of the semaphore
        //try {sema1.acquire();} catch(InterruptedException e){}
    	   waitForCustomer();
    	   //insert semaphore here
    	   try {sema1.acquire();} catch(InterruptedException e){}
           makeSandwich();
           atCashRegister();
           sema2.release();
           try {sema1.acquire();} catch(InterruptedException e){}
           paymentAccepted();
        }


    private void waitForCustomer() {
        System.out.println("\t\t\t\t\t\t\t\t\t\t\t\t| Employee");
    }

    private void makeSandwich() {
        System.out.println("\t\t\t\t\t\t\t\t\t\t\t\t| \t\tEmployee");
        SandwichShopStarter.randomSleep(1000);
    }

    private void atCashRegister() {
        System.out.println("\t\t\t\t\t\t\t\t\t\t\t\t| \t\t\t\t\tEmployee");
    }

    private void paymentAccepted() {
        System.out.println("\t\t\t\t\t\t\t\t\t\t\t\t| \t\t\t\t\t\t\tEmployee");
    }
}
}