/*

Wendy is a class of objects used within an application, but
we have added a test program (static main) to it so that it can
be tested on its own

[[a "Wendy" is a time object ;-) from earlier examples!]]

*/

public class Wendy {

        public int hour;
        public int minute;
        public int second;
        public static int howmany = 0;

/* This is a test program ... when you load in the methods
and run them normally it will be ignored but when you ask the
JVM to run this class on its own, this is the entry point! */

public static void main (String [] args)
                throws CloneNotSupportedException {

        // Set up an array for times
        Wendy [] services = new Wendy[4];

        services[0] = new Wendy(6,40);
        services[1] = new Wendy(7,17);
        services[2] = new Wendy(19,11);
        services[3] = new Wendy(19,47);

        // Delay the 19:11 by 17 minutes
        // (Deer on line near Lacock)
        // This copies the REFERENCE so that "delayed" is
        // really another name for services[2]

        Wendy delayed = services[2];
        delayed.setforward(17 * 60);

        // The clone method (inherited from Object) on the
        // other hand duplicates all the fields
        // Not everything supports "clone" ;-)

        // Wendy knockon = (Wendy)(services[3].clone());
        // knockon.setforward(14 * 60);

        // Let's have it produce its own documentation!

        System.out.println("All about this class");
        System.out.println("Test program documentation ...");
        System.out.println("Support contact data, etc...");

        // In here, getsid is a dynamic or object method
        // in runs on an individual object

        for (int j=0; j<services.length; j++) {
                // A comparison of two objects
                System.out.println(services[j]);
                if (j > 0) {
                    int interval = services[j-1].getgap(services[j]);
                    System.out.println ("Wait of "+interval+" mins");
                    }
                System.out.println("There is a train at "
                        + services[j].getsid());
                System.out.println("i.e. " + services[j].getdef() +
                        " when the next train goes");
                }

        // In here, getcount is a static or class method
        // in runs on the class as a whole

        int quantity = Wendy.getcount();
        System.out.println("A total of "+quantity+
                "services");
        }

        // Overloaded constructors both call internal routine
        public Wendy(int hour, int m, int s){
                timeset(hour,m,s);
                }
        public Wendy(int hour, int m){
                timeset(hour,m,30);
                }
        private void timeset(int hour, int m, int s) {
                this.hour = hour;
                minute = m;
                second = s;
                howmany += 1;
                }

        public int getsid(){
                return ((hour * 60)+ minute)*60 + second;
                }
        public int gethour(){
                return hour;
                }
        public void setforward(int secondsplus) {
                // Good example of "encapsulation" - hiding within
                second += secondsplus;
                int extramins = second / 60;
                second = second % 60;
                minute += extramins;
                int extrahours = minute / 60;
                minute = minute % 60;
                hour += extrahours;
                }
        public String getdef() {
                String result = "It is " + hour + " " +
                        minute + " minute " + second + "second";
                return result;
                }

        public int getgap(Wendy that) {
                // Explicit use of "this" is just for clarity!
                int sec_1 = this.getsid();
                int sec_2 = that.getsid();
                return ((sec_2 - sec_1) / 60);
                }

        public String toString() {
                String aboot = "\nIt's a Wendy "+
                                "hour: " + hour +
                                " minute: " + minute +
                                " second: " + second ;
                return aboot;
                }

// CLASS method(s) can only access static variables

        public static int getcount() {
                return (howmany);
                }
}