From 33f50aaccee4e0e924f9bd23d1940f9f135c6dde Mon Sep 17 00:00:00 2001
From: Kimmo Puputti <git@kimmo.kpuputti.fi>
Date: Thu, 5 Oct 2017 16:00:48 +0300
Subject: [PATCH] Add validator for min age from a date object

---
 .../BirthdayInputField/BirthdayInputField.example.js      | 4 +++-
 src/util/validators.js                                    | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/components/BirthdayInputField/BirthdayInputField.example.js b/src/components/BirthdayInputField/BirthdayInputField.example.js
index 13a989cf..c82ff930 100644
--- a/src/components/BirthdayInputField/BirthdayInputField.example.js
+++ b/src/components/BirthdayInputField/BirthdayInputField.example.js
@@ -8,6 +8,8 @@ const formName = 'Styleguide.BirthdayInput.Form';
 
 const FormComponent = () => {
   const required = validators.required('A valid date is required');
+  const minAge = 18;
+  const minAgeRequired = validators.ageAtLeast(`Age should be at least ${minAge}`, minAge);
   return (
     <form>
       <BirthdayInputField
@@ -15,7 +17,7 @@ const FormComponent = () => {
         name="birthday"
         label="Date of birth"
         format={null}
-        validate={required}
+        validate={[required, minAgeRequired]}
       />
     </form>
   );
diff --git a/src/util/validators.js b/src/util/validators.js
index 0e916365..9fedaaa9 100644
--- a/src/util/validators.js
+++ b/src/util/validators.js
@@ -1,3 +1,4 @@
+import moment from 'moment';
 import { types } from 'sharetribe-sdk';
 
 const { LatLng } = types;
@@ -68,3 +69,10 @@ export const emailFormatValid = message =>
   value => {
     return value && EMAIL_RE.test(value) ? VALID : message;
   };
+
+export const ageAtLeast = (message, minYears) =>
+  value => {
+    const now = moment();
+    const ageInYears = now.diff(moment(value), 'years', true);
+    return value && value instanceof Date && ageInYears >= minYears ? VALID : message;
+  };