public class TheatreSimulatorProgram { 
    // Simulate the opening of a movie to a theatre
    public static void openMovie(Theatre aTheatre, String newMovie) {
        aTheatre.moviePlaying = newMovie;
        aTheatre.movieEarnings = 0;
        aTheatre.seatsSold = 0;
        aTheatre.admittedPatrons = 0;
    }
    
    // Simulate a patron entering a theatre
    public static void admit(Patron aPatron, Theatre aTheatre) {
        if ((aPatron.ticket != null) && 
            (aPatron.ticket.theatreID == aTheatre.id)) {
            
            aPatron.ticket = null;
            aTheatre.admittedPatrons++;
        }
    }
    
    // Determine and return the price that the given Patron should pay for a ticket
    public static float priceFor(Patron p) {
        if (p.age <= 12)
            return Ticket.REG_CHILD_PRICE;
        else if (p.age >= 65)
            return Ticket.REG_SENIOR_PRICE;
        
        return Ticket.REG_ADULT_PRICE;
    }
    
    // Simulate a patron buying a ticket at a theatre
    public static void buyTicket(Patron aPatron, Theatre aTheatre) {
        if (aTheatre.seatsSold < aTheatre.capacity) {
            Ticket  t = new Ticket(aTheatre.id);    // make the ticket
            aPatron.ticket = t;                     // store the ticket
            
            // Now increase the earnings and add 1 to the count of seats sold
            aTheatre.movieEarnings += priceFor(aPatron);
            aTheatre.seatsSold++;
        }
    }
    
    // Simulate a patron returning a ticket for a theatre
    public static void returnTicket(Patron aPatron, Theatre aTheatre) {
        if ((aPatron.ticket != null) && 
            (aPatron.ticket.theatreID == aTheatre.id)) {
            
            aPatron.ticket = null;
            
            // Now decrease the earnings and deduct 1 from the count
            aTheatre.movieEarnings -= priceFor(aPatron);
            aTheatre.seatsSold--; 
        }
    }

    // The program starts here
    public static void main(String args[]) { 
        // Make a couple of theatres
        Theatre t1 = new Theatre('A', 3);  // capacity = 3 
        Theatre t2 = new Theatre('B', 10);
        
        // Make a few of patrons
        Patron adam = new Patron(10); 
        Patron biff = new Patron(17); 
        Patron chad = new Patron(21); 
        Patron dana = new Patron(73);
        
        System.out.println("Theatre 1 capacity:   " + t1.capacity); 
        System.out.println("Theatre 1 seats sold: " + t1.seatsSold); 
        
        System.out.println("Theatre 1 opening Movie ... \"Jurassic World\"");
        openMovie(t1, "Jurassic World"); 
        System.out.println("Theatre 1 earnings:   " + t1.movieEarnings);
        
        System.out.println("10 year old buying a ticket ... ");
        buyTicket(adam, t1); 
        System.out.println(adam); 
        
        System.out.println("17 year old and 21 year old buying tickets ... ");
        buyTicket(biff, t1); 
        buyTicket(chad, t1); 
        System.out.println("Theatre 1 seats sold: " + t1.seatsSold); 
        System.out.println("Theatre 1 earnings:   " + t1.movieEarnings);
        
        System.out.println("10 year old returning a ticket ... ");
        returnTicket(adam, t1); 
        System.out.println("Theatre 1 seats sold: " + t1.seatsSold); 
        System.out.println("Theatre 1 earnings:   " + t1.movieEarnings);
        System.out.println(adam);
        
        System.out.println("73 year old buying a ticket ... ");
        buyTicket(dana, t1); 
        System.out.println(dana);
        System.out.println("Theatre 1 seats sold: " + t1.seatsSold); 
        
        System.out.println("Admitting 17 year old into theatre ... ");
        admit(biff, t1); 
        System.out.println(biff);
        
        System.out.println("Admitting 21 year old into wrong theatre ... ");
        admit(chad, t2); 
        System.out.println(chad);
        System.out.println("Theatre 2 admitted patrons: " + t2.admittedPatrons); 
        
        System.out.println("Admitting 21 year old into correct theatre ... ");
        admit(chad, t1); 
        System.out.println("Theatre 1 admitted patrons: " + t1.admittedPatrons); 
        System.out.println("Admitting 73 year old into theatre 1 ... ");
        admit(dana, t1); 
        System.out.println("Theatre 1 admitted patrons: " + t1.admittedPatrons); 
        System.out.println("Attempt to admit 10 year old into theatre 1 ... ");
        admit(adam, t1); 
        System.out.println("Theatre 1 admitted patrons: " + t1.admittedPatrons); 
        System.out.println("Theatre 1 earnings:   " + t1.movieEarnings);
    } 
}