Data Update

Task/Biorhythms/Java/biorhythms.java

@@ -0,0 +1,76 @@
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+
+public final class Biorythms {
+
+	public static void main(String[] aArgs) {
+	    List<List<String>> datePairs = List.of(
+	    	List.of( "1943-03-09", "1972-07-11" ),
+	    	List.of( "1809-01-12", "1863-11-19" ),
+	    	List.of( "1809-02-12", "1863-11-19" ));
+	
+	    for ( List<String> datePair : datePairs ) {
+	    	biorhythms(datePair);
+	    }
+	}
+	
+	private static void biorhythms(List<String> aDatePair) {
+		DateTimeFormatter formatter = DateTimeFormatter.ISO_LOCAL_DATE;
+	    LocalDate birthDate = LocalDate.parse(aDatePair.get(0), formatter);
+	    LocalDate targetDate = LocalDate.parse(aDatePair.get(1), formatter);
+	    final int daysBetween = (int) ChronoUnit.DAYS.between(birthDate, targetDate);
+	    System.out.println("Birth date " + birthDate + ", Target date " + targetDate);
+	    System.out.println("Days between: " + daysBetween);
+	
+	    for ( Cycle cycle : Cycle.values() ) {
+	        final int cycleLength = cycle.length();
+	        final int positionInCycle = daysBetween % cycleLength;
+	        final int quadrantIndex = 4 * positionInCycle / cycleLength;	
+	        final int percentage = (int) Math.round(100 * Math.sin(2 * Math.PI * positionInCycle / cycleLength));
+	
+	        String description;
+	        if ( percentage > 95 ) {
+	        	description = "peak";
+	        } else if ( percentage < -95 ) {
+	        	description = "valley";
+	        } else if ( Math.abs(percentage) < 5 ) {
+	            description = "critical transition";
+	        } else {
+	        	final int daysToTransition = ( cycleLength * ( quadrantIndex + 1 ) / 4 ) - positionInCycle;
+		        LocalDate transitionDate = targetDate.plusDays(daysToTransition);
+		        List<String> descriptions = cycle.descriptions(quadrantIndex);
+		        String trend = descriptions.get(0);
+		        String nextTransition = descriptions.get(1);
+	            description = percentage + "% (" + trend + ", next " + nextTransition + " " + transitionDate + ")";
+	        }
+	
+	        System.out.println(cycle + " day " + positionInCycle  + ": " + description);
+	    }
+	    System.out.println();
+	}
+	
+	private enum Cycle {		
+		PHYSICAL(23), EMOTIONAL(28), MENTAL(33);
+		
+		public int length() {
+			return length;
+		}
+		
+		public List<String> descriptions(int aNumber) {
+			return DESCRIPTIONS.get(aNumber);
+		}
+				
+		private Cycle(int aLength) {
+			length = aLength;
+		}	
+		
+		private final int length;
+		
+		private static final List<List<String>> DESCRIPTIONS = List.of(
+			List.of( "up and rising", "peak" ), List.of( "up but falling", "transition" ),
+		    List.of( "down and falling", "valley" ), List.of( "down but rising", "transition" )); 		
+	}
+
+}