// Author: James D. Skrentny, skrentny@cs.wisc.edu
//         copyright 2009-2012 all rights reserved

// My solutions work from coarse to fine units of time
// that is, from year to month to day.
//
// I've also chosen to test in the order of past, future, and
// present. Different orderings are possible. Only when
// the current unit of time is in the present, do we test the
// next finer unit of time.


// WORKS, but can you find any unnecessary if conditions?

if (year < YEAR) {
	System.out.println("Past!");
} else if (year > YEAR) {
	System.out.println("Future!");
} else if (year == YEAR) {
	if (month < MONTH) {
		System.out.println("Past!");
	} else if (month > MONTH) {
		System.out.println("Future!");
	} else if (month == MONTH) {
		if (day < DAY) {
			System.out.println("Past!");
		} else if (day > DAY) {
			System.out.println("Future!");
		} else if (day == DAY) {
			System.out.println("Present!");
		}
	}
}


// WORKS and more EFFICIENT. Solution eliminates unnecessary
// if conditions. Structure could still be improved since it
// still uses 3 if-else-if statements (one for year, month and day).

if (year < YEAR) {
	System.out.println("Past!");
} else if (year > YEAR) {
	System.out.println("Future!");
} else { // year must be in present
	if (month < MONTH) {
		System.out.println("Past!");
	} else if (month > MONTH) {
		System.out.println("Future!");
	} else { // year & month both must be in present
		if (day < DAY) {
			System.out.println("Past!");
		} else if (day > DAY) {
			System.out.println("Future!");
		} else {
			System.out.println("Present!");
		}
	}
}


// WORKS, EFFICIENT, and better STRUCTURE. Good solution that uses
// 1 if-else-if statement but notice the code redundancy?
// Redundancy is a sign of poor structure! We can do better...

if (year < YEAR) {
	System.out.println("Past!");
} else if (year > YEAR) {
	System.out.println("Future!");
} else if (month < MONTH) { // year in present
	System.out.println("Past!");
} else if (month > MONTH) {
	System.out.println("Future!");
} else if (day < DAY) {     // year & month in present
	System.out.println("Past!");
} else if (day > DAY) {
	System.out.println("Future!");
} else {
	System.out.println("Present!");
} 


// WORKS, EFFICIENT, and good STRUCTURE. Excellent solution that
// that eliminates the code redundancy above by compounding
// the conditions.
// Must be careful to include conditions to ensure year and month
// are same as present date for logic to work.

if (     year <  YEAR
	  || year == YEAR && month <  MONTH
	  || year == YEAR && month == MONTH && day < DAY) {
	System.out.println("Past!");
}
else if (    year >  YEAR
	      || year == YEAR && month >  MONTH
	      || year == YEAR && month == MONTH && day > DAY) {
	System.out.println("Future!");
}
else {
	System.out.println("Present!");
}

// Note the compound conditions work without needing extra ()'s!
// Why? (hint - review p. 103 and see Appendix B on p. 453)