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{-# LANGUAGE OverloadedStrings, RecordWildCards #-}
-- copyright and license info here
module PTO where
import Import
import Data.Maybe (fromMaybe)
import Data.Time.Calendar (Day, fromGregorian, toGregorian, gregorianMonthLength, diffDays, addDays)
import Database.Persist.Sql (SqlBackend) -- this can't be good
accrual :: (Functor m, PersistQuery m, PersistMonadBackend m ~ SqlBackend) =>
UserId -> (Integer, Int) -> m Rational
accrual u' (y',m') = do
(e':es') <- fmap (map entityVal) (selectList [EmploymentUser ==. u'] [])
return $ accrualThisMonth (e':es') (y',m')
accrualThisMonth :: [Employment] -> (Integer, Int) -> Rational
accrualThisMonth es@(e1:es') (y,m) = baseRateAccrual + twoYearRateAccrual
where
baseRateAccrual = baseLevel * sum (map (proportionOf tmBRRange) es)
twoYearRateAccrual = afterTwo * sum (map (proportionOf tmTYRRange) es)
proportionOf r emp = toRational (employmentCommitment emp) *
proportion (fromMaybe (Nothing,Nothing)
(r >>= rangeIntersection (employmentRange emp)))
thisMonthRange
employmentRange emp = (Just (employmentStartDate emp), employmentEndDate emp)
proportion (Just a,Just b) (Just a', Just b') = toRational (diffDays b a + 1) / toRational (diffDays b' a' + 1)
proportion _ _ = 0
tmBRRange = rangeIntersection brRange thisMonthRange
tmTYRRange = rangeIntersection tyRange thisMonthRange
startDate = employmentStartDate e1
brRange = (Just startDate, Just (addDays (-1) (twoYearsFrom startDate)))
tyRange = (Just (twoYearsFrom startDate), Nothing)
thisMonthRange = (Just (startOfMonth (y,m)), Just (endOfMonth (y,m)))
baseLevel = 104/12
afterTwo = 12
-- deductions :: PersistQuery backend m => (Integer, Int) -> Key backend (UserGeneric backend) -> backend m [Entity (TimeEntryGeneric backend)]
deductions (year,month) user = do
let monthstart = startOfMonth (year, month)
monthend = endOfMonth (year, month)
cats <- deductibles
entries <- selectList [TimeEntryUser ==. user, TimeEntryDay >=. monthstart, TimeEntryDay <=. monthend, TimeEntryCategory <-. cats] []
return entries
-- deductibles :: PersistQuery backend m => backend m [Key backend (TimeCategoryGeneric backend)]
deductibles = do
ds <- selectList ([TimeCategoryName ==. "/admin/paid-time-off"]
||. [TimeCategoryName ==. "/admin/personal"]
||. [TimeCategoryName ==. "/admin/pto"]
||. [TimeCategoryName ==. "/admin/vacation"]) []
return $ map entityKey ds
yearlySacrifice :: Num a => a -> a
yearlySacrifice hs = 160 - hs
-- monthlyTransactions :: UserId -> (Integer, Int) -> m (Rational, Double)
monthlyTransactions u (y,m) = do
accrue <- accrual u (y,m)
deducts <- fmap (sum . map (timeEntryHours . entityVal)) (deductions (y,m) u)
return (accrue, deducts)
startOfMonth :: (Integer, Int) -> Day
startOfMonth (year,month) = fromGregorian year month 1
endOfMonth :: (Integer, Int) -> Day
endOfMonth (year,month) = fromGregorian year month 32
twoYearsFrom :: Day -> Day
twoYearsFrom = (\(y,m,d) -> fromGregorian (y+2) m d) . toGregorian
monthOf :: Day -> (Integer, Int)
monthOf = (\(x,y,_) -> (x,y)) . toGregorian
rangeIntersection :: (Maybe Day, Maybe Day) -> (Maybe Day, Maybe Day) -> Maybe (Maybe Day, Maybe Day)
rangeIntersection (a,b) (a',b') = let (c,d) = (newest a a', oldest b b') in if (c > d) then Nothing else Just (c,d)
where
newest Nothing x = x
newest x Nothing = x
newest (Just x) (Just y) = Just (max x y)
oldest Nothing x = x
oldest x Nothing = x
oldest (Just x) (Just y) = Just (min x y)
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