/*
 * Class whose objects are point in time represented by hours, minutes and seconds.
 * The class has getters that return the hours, minutes and seconds for a given time stamp.
 * The class has no setters due to the implementation of the method void skip(TimeStamp time).
 * This method can change a timestamp if that is what one want to do.
 */

public class TimeStamp{

	//Attributes
	private int hours;
	private int minutes;
	private int seconds;

	public static void main(String[] args){
		System.out.println("This is a class that can manage time stamps.");
		System.out.println("The timestamps are given in hours:minutes:seconds.");
		System.out.println("Hours are in the interval from 0 to 23, minutes in ");
		System.out.println("the interval 0 to 59 and seconds in the interval from 0 to 59.");
		System.out.print("\n");

		TimeStamp timeStamp1 = new TimeStamp(23, 59, 59);
		TimeStamp timeStamp2 = new TimeStamp(1, 23, 45);

		System.out.println(timeStamp1.toString());
		timeStamp1.skipMinute();
		System.out.println(timeStamp1.toString());
		timeStamp1.skipSecond();
		System.out.println(timeStamp1.toString());
		timeStamp1.skip(timeStamp2);
		System.out.println(timeStamp1.toString());
		System.out.println(timeStamp1.equals(timeStamp2));
		System.out.println(timeStamp1.copy().toString());
	}

	//Getters
	public int getHours(){
		return this.hours;
	}

	public int getMinutes(){
		return this.minutes;
	}

	public int getSeconds(){
		return this.seconds;
	}


	//Default constructor i.e. hours, minutes and seconds are set to 0.
	public TimeStamp(){
		this.hours = 0;
		this.minutes = 0;
		this.seconds = 0;
	}

	//Constructor where you set the hours. Minutes and seconds are set to 0.
	public TimeStamp(int hours){
		if(valid(hours, 0, 0)){
			this.hours = hours;
			this.minutes = 0;
			this.seconds = 0;
		} else {
			System.out.println("Please enter valid amount of hours");
		}
	}

	//Constructor where you set the hours and minutes. Seconds are set to 0.
	public TimeStamp(int hours, int minutes){
		if(valid(hours, minutes, 0)){
			this.hours = hours;
			this.minutes = minutes;
			this.seconds = 0;
		} else {
			System.out.println("Please enter valid amount of hours and/or minutes");
		}
	}

	//Constructor where you set the hours, minutes and seconds.
	public TimeStamp(int hours, int minutes, int seconds){
		if(valid(hours, minutes, seconds)){
			this.hours = hours;
			this.minutes = minutes;
			this.seconds = seconds;
		} else {
			System.out.println("Please enter valid amount of hours, minutes and/or seconds");
		}
	}

	//Method that checks whether the given time stamp is valid
	public boolean valid(int hours, int minutes, int seconds){
		boolean valid;
		if(0 <= hours && hours < 24 && 0 <= minutes && minutes < 60 && 0 <= seconds && seconds < 60){
			valid = true;
		} else {
			valid = false;
		}
		return valid;
	}


	//Method that adds one second to a time stamp
	public void skipSecond(){
		if(seconds < 59){
			seconds = seconds + 1;
		} else {
			seconds = 0;
			skipMinute();
		}
	}

	//Method that adds one minute to a time stamp
	public void skipMinute(){
		if(minutes < 59){
			minutes = minutes + 1;
		} else {
			minutes = 0;
			skipHour();
		}
	}

	//Method that adds one hour to a time stamo
	public void skipHour(){
		if(hours < 23){
			hours = hours + 1;
		} else {
			hours = 0;
		}
	}

	//Adds the amount of time described in time to the time stamp.
	public void skip(TimeStamp time){
		for(int i = 0; i < time.getSeconds(); i++){
			skipSecond();
		}
		for(int i = 0; i < time.getMinutes(); i++){
			skipMinute();
		}
		for(int i = 0; i < time.getHours(); i++){
			skipHour();
		}

	}

	//Checks whether two time stamps are equal.
	public boolean equals(Object other){
		TimeStamp otherTimeStamp = (TimeStamp)other;
		return this.seconds == otherTimeStamp.seconds && this.minutes == otherTimeStamp.minutes && this.hours == otherTimeStamp.hours;
	}

	//Produces a copy of a time stamp.
	public TimeStamp copy(){
		TimeStamp copy = new TimeStamp();
		copy.seconds = this.seconds;
		copy.minutes = this.minutes;
		copy.hours = this.hours;
		return copy;
	}


	//toString method that returns textual representation of a time stamp
	public String toString(){
		return getHours() + ":" + getMinutes() + ":" + getSeconds();
	}

}




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/*
 * Class with objects that represent a date as a year, month and day.
 * We have getters for the year, month and day. Setters are omitted since
 * if we want to change a date, we do so by using void skipTime().
 */

public class Date extends TimeStamp{

	private int year;
	private int month;
	private int day;


	//Constructor that creates a date corresponding to the given year, month and day. The time is set to midnight.
	public Date(int year, int month, int day){
		super();
		this.year = year;
		this.month = month;
		this.day = day;
	}

	//Constructor that creates a date corresponding to the given year, month, date and time stamp.
	public Date(int year, int month, int day, TimeStamp time(hours, minutes, seconds)){
		super(hours, minutes, seconds);
		this.year = year;
		this.month = month;
		this.day = day;
	}

	//Checks whether the given date is a valid date
	public boolean valid(int year, int month, int day){
		boolean valid;

		return valid;
	}




}