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|
{-# LANGUAGE OverloadedStrings #-}
module Model.Date
( Date(..)
, SuccessiveDates
, renderDate
, getCurrentDate
, getNextWeek
, getWeekDay
, plusDays
, sameDayAndMonth
, dayAndMonthInRange
, isBeforeOrEqualDayAndMonth
, yearsGap
, daysGap
, isValid
) where
import Text.Printf (printf)
import Data.Time.Clock
import Data.Time.Calendar
import Data.Time.LocalTime
import Data.Time.Format (formatTime, defaultTimeLocale)
import Data.Text (Text)
import qualified Data.Text as T
import Data.Maybe (isJust, listToMaybe)
import Time (formatCurrentLocale)
data Date = Date
{ day :: Int
, month :: Int
, year :: Int
} deriving (Eq, Show)
renderDate :: Date -> Text
renderDate (Date d m y) =
T.concat
[ T.pack $ printf "%02d" d
, "/"
, T.pack $ printf "%02d" m
, "/"
, T.pack . show $ y
]
getCurrentDate :: IO Date
getCurrentDate = do
now <- getCurrentTime
timezone <- getCurrentTimeZone
let zoneNow = utcToLocalTime timezone now
return . dateFromDay $ localDay zoneNow
type SuccessiveDates = [Date]
getNextWeek :: IO SuccessiveDates
getNextWeek = do
currentDate <- getCurrentDate
currentDayNumberOfWeek <- (read . T.unpack <$> formatCurrentLocale "%u") :: IO Int
return $ map (plusDays currentDate) $ take 7 [(8 - currentDayNumberOfWeek)..]
getWeekDay :: Date -> Text
getWeekDay = T.toLower . T.pack . formatTime defaultTimeLocale "%A" . dateToDay
plusDays :: Date -> Int -> Date
plusDays date n = dateFromDay . addDays (toInteger n) . dateToDay $ date
dateToDay :: Date -> Day
dateToDay (Date d m y) = fromGregorian (toInteger y) m d
dateFromDay :: Day -> Date
dateFromDay dayTime =
let (y, m, d) = toGregorian dayTime
in Date d m (fromIntegral y)
sameDayAndMonth :: Date -> Date -> Bool
sameDayAndMonth d1 d2 =
( day d1 == day d2
&& month d1 == month d2
)
isBeforeOrEqualDayAndMonth :: Date -> Date -> Bool
isBeforeOrEqualDayAndMonth d1 d2 =
( month d1 < month d2
|| ( month d1 == month d2
&& day d1 <= day d2
)
)
yearsGap :: Date -> Date -> Int
yearsGap d1 d2 = abs (year d2 - year d1)
daysGap :: Date -> Date -> Int
daysGap d1 d2 = abs . fromIntegral $ (dateToDay d1) `diffDays` (dateToDay d2)
isValid :: Date -> Bool
isValid (Date d m y) = isJust $ fromGregorianValid (toInteger y) m d
dayAndMonthInRange :: [Date] -> Date -> Maybe Date
dayAndMonthInRange dates date = listToMaybe . filter (sameDayAndMonth date) $ dates
|
