From ff8ad824ddf5d900815cd3027b827dc6902d87ff Mon Sep 17 00:00:00 2001
From: Guilherme Rodrigues <guilherme.machado.r@gmail.com>
Date: Fri, 4 Mar 2016 23:43:56 -0300
Subject: [PATCH] Creating filter 'age' to calculate the age based on the
 birthdate

---
 src/filters.js      | 27 +++++++++++++++++++++++++--
 src/filters.test.js | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/src/filters.js b/src/filters.js
index ff18725..971a224 100644
--- a/src/filters.js
+++ b/src/filters.js
@@ -53,7 +53,7 @@ m.filter('percentage', ['$filter', function($filter) {
 			thousandsDelimiter = $locale.NUMBER_FORMATS.GROUP_SEP,
 			currencySym = '';
 
-		if(currency === true) {
+		if (currency === true) {
 			currencySym = $locale.NUMBER_FORMATS.CURRENCY_SYM + ' ';
 		} else if (currency) {
 			currencySym = currency;
@@ -66,4 +66,27 @@ m.filter('percentage', ['$filter', function($filter) {
 	return function(input) {
 		return BrM.nfeAccessKey(input);
 	};
-}]);
+}])
+.filter('age', function() {
+	/**
+	 * @param value birthdate can be a date object or a time in milliseconds
+	 * return the age based on the birthdate or undefined if value is invalid.
+	 */
+	 return function calculateAge(value) {
+		 if (!value) {
+			 return undefined;
+		 }
+		 var isDateInstance = (value instanceof Date);
+		 var isValidType = isDateInstance || !isNaN(parseInt(value));
+		 if (!isValidType) {
+			 return undefined;
+		 }
+		 var birthdate = isDateInstance ? value : new Date(value);
+		 if (birthdate > new Date()) {
+			 return undefined;
+		 }
+		 var ageDifMs = Date.now() - birthdate.getTime();
+		 var ageDate = new Date(ageDifMs); // miliseconds from epoch
+		 return Math.abs(ageDate.getUTCFullYear() - 1970);
+	 }
+});
diff --git a/src/filters.test.js b/src/filters.test.js
index 3c3d005..cbbf9a6 100644
--- a/src/filters.test.js
+++ b/src/filters.test.js
@@ -142,4 +142,36 @@ describe('br-filters', function() {
 				.toBe('3514 0111 7242 5800 0157 5500 1000 6882 1916 3038 6000');
 		});
 	});
+	describe('age', function() {
+		it('should be undefined if null, undefined or empty', function() {
+			expect(testFilter('age')(null)).toBe(undefined);
+			expect(testFilter('age')(undefined)).toBe(undefined);
+			expect(testFilter('age')('')).toBe(undefined);
+		});
+		
+		it('should be undefined if not date or time in milliseconds', function() {
+			expect(testFilter('age')('not a date')).toBe(undefined);
+			expect(testFilter('age')(true)).toBe(undefined);
+		});
+		
+		it('should be undefined for future birthdate', function() {
+			var futureYear = new Date();
+			futureYear.setFullYear(futureYear.getFullYear() + 1);
+			expect(testFilter('age')(futureYear)).toBe(undefined);
+			var futureMonth = new Date();
+			futureMonth.setMonth(futureMonth.getMonth() + 1);
+			expect(testFilter('age')(futureMonth)).toBe(undefined);
+			var futureDay = new Date();
+			futureDay.setDate(futureDay.getDate() + 1);
+			expect(testFilter('age')(futureDay)).toBe(undefined);
+			var futureMinute = new Date();
+			futureMinute.setMinutes(futureMinute.getMinutes() + 1);
+			expect(testFilter('age')(futureMinute)).toBe(undefined);
+		});
+		
+		it('should format date as 27', function() {
+			expect(testFilter('age')(new Date(1988, 10, 07))).toBe(27);
+			expect(testFilter('age')(597463200000)).toBe(27);
+		});
+	})
 });