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+{- RequestMethod.hs -- how to request somebody's age off the Internet
+Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name>
+
+This module is a part of ageOf.
+
+ageOf is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later
+version.
+
+ageOf is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+ageOf. If not, see <http://www.gnu.org/licenses/>. -}
+
+module RequestMethod ( RequestMethod(..)
+ , getAge
+ ) where
+
+import Control.Applicative ((<$>))
+import Data.Time
+
+data RequestMethod = AgeFunction (String -> IO (Maybe Integer))
+ | BirthDateFunction (String -> IO (Maybe Day))
+
+getAge :: RequestMethod -> String -> IO (Maybe Integer)
+getAge (AgeFunction f) name = f name
+getAge (BirthDateFunction f) name = do
+ today <- localDay <$> zonedTimeToLocalTime <$> getZonedTime
+ maybeDate <- f name
+ return $ diffYears today <$> maybeDate
+
+diffYears :: Day -> Day -> Integer
+new `diffYears` old =
+ let (oldYear, _, _) = toGregorian old
+ (newYear, _, _) = toGregorian new in
+ let yearsDelta = newYear - oldYear in
+ if addGregorianYearsRollOver yearsDelta old > new
+ then yearsDelta - 1
+ else yearsDelta