{-# LANGUAGE Safe #-}

module Data.Time.Calendar.Week (
    -- * Week
    DayOfWeek (..),
    dayOfWeek,
    dayOfWeekDiff,
    firstDayOfWeekOnAfter,
) where

import Control.DeepSeq
import Data.Data
import Data.Fixed
import Data.Ix
import Data.Time.Calendar.Days

data DayOfWeek
    = Monday
    | Tuesday
    | Wednesday
    | Thursday
    | Friday
    | Saturday
    | Sunday
    deriving (DayOfWeek -> DayOfWeek -> Bool
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instance NFData DayOfWeek where
    rnf :: DayOfWeek -> ()
rnf DayOfWeek
Monday = ()
    rnf DayOfWeek
Tuesday = ()
    rnf DayOfWeek
Wednesday = ()
    rnf DayOfWeek
Thursday = ()
    rnf DayOfWeek
Friday = ()
    rnf DayOfWeek
Saturday = ()
    rnf DayOfWeek
Sunday = ()

-- | \"Circular\", so for example @[Tuesday ..]@ gives an endless sequence.
-- Also: 'fromEnum' gives [1 .. 7] for [Monday .. Sunday], and 'toEnum' performs mod 7 to give a cycle of days.
instance Enum DayOfWeek where
    toEnum :: Int -> DayOfWeek
toEnum Int
i =
        case Int -> Int -> Int
forall a. Integral a => a -> a -> a
mod Int
i Int
7 of
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0 -> DayOfWeek
Sunday
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1 -> DayOfWeek
Monday
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2 -> DayOfWeek
Tuesday
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3 -> DayOfWeek
Wednesday
            Int
4 -> DayOfWeek
Thursday
            Int
5 -> DayOfWeek
Friday
            Int
_ -> DayOfWeek
Saturday
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Monday = Int
1
    fromEnum DayOfWeek
Tuesday = Int
2
    fromEnum DayOfWeek
Wednesday = Int
3
    fromEnum DayOfWeek
Thursday = Int
4
    fromEnum DayOfWeek
Friday = Int
5
    fromEnum DayOfWeek
Saturday = Int
6
    fromEnum DayOfWeek
Sunday = Int
7
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3

-- | @dayOfWeekDiff a b = a - b@ in range 0 to 6.
-- The number of days from b to the next a.
dayOfWeekDiff :: DayOfWeek -> DayOfWeek -> Int
dayOfWeekDiff :: DayOfWeek -> DayOfWeek -> Int
dayOfWeekDiff DayOfWeek
a DayOfWeek
b = Int -> Int -> Int
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7

-- | The first day-of-week on or after some day
firstDayOfWeekOnAfter :: DayOfWeek -> Day -> Day
firstDayOfWeekOnAfter :: DayOfWeek -> Day -> Day
firstDayOfWeekOnAfter DayOfWeek
dw Day
d = Integer -> Day -> Day
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