{-# OPTIONS -fno-warn-unused-imports #-}
module Data.Time.Calendar.Days
(
    -- * Days
    Day(..),addDays,diffDays
) where

import Control.DeepSeq
import Data.Ix
import Data.Typeable
import Data.Data

-- | The Modified Julian Day is a standard count of days, with zero being the day 1858-11-17.
newtype Day = ModifiedJulianDay {Day -> Integer
toModifiedJulianDay :: Integer} deriving (Day -> Day -> Bool
(Day -> Day -> Bool) -> (Day -> Day -> Bool) -> Eq Day
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
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Data, Typeable)

instance NFData Day where
    rnf :: Day -> ()
rnf (ModifiedJulianDay Integer
a) = Integer -> ()
forall a. NFData a => a -> ()
rnf Integer
a

-- necessary because H98 doesn't have "cunning newtype" derivation
instance Enum Day where
    succ :: Day -> Day
succ (ModifiedJulianDay Integer
a) = Integer -> Day
ModifiedJulianDay (Integer -> Integer
forall a. Enum a => a -> a
succ Integer
a)
    pred :: Day -> Day
pred (ModifiedJulianDay Integer
a) = Integer -> Day
ModifiedJulianDay (Integer -> Integer
forall a. Enum a => a -> a
pred Integer
a)
    toEnum :: Int -> Day
toEnum = Integer -> Day
ModifiedJulianDay (Integer -> Day) -> (Int -> Integer) -> Int -> Day
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. Int -> Integer
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toEnum
    fromEnum :: Day -> Int
fromEnum (ModifiedJulianDay Integer
a) = Integer -> Int
forall a. Enum a => a -> Int
fromEnum Integer
a
    enumFrom :: Day -> [Day]
enumFrom (ModifiedJulianDay Integer
a) = (Integer -> Day) -> [Integer] -> [Day]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Integer -> Day
ModifiedJulianDay (Integer -> [Integer]
forall a. Enum a => a -> [a]
enumFrom Integer
a)
    enumFromThen :: Day -> Day -> [Day]
enumFromThen (ModifiedJulianDay Integer
a) (ModifiedJulianDay Integer
b) = (Integer -> Day) -> [Integer] -> [Day]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Integer -> Day
ModifiedJulianDay (Integer -> Integer -> [Integer]
forall a. Enum a => a -> a -> [a]
enumFromThen Integer
a Integer
b)
    enumFromTo :: Day -> Day -> [Day]
enumFromTo (ModifiedJulianDay Integer
a) (ModifiedJulianDay Integer
b) = (Integer -> Day) -> [Integer] -> [Day]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Integer -> Day
ModifiedJulianDay (Integer -> Integer -> [Integer]
forall a. Enum a => a -> a -> [a]
enumFromTo Integer
a Integer
b)
    enumFromThenTo :: Day -> Day -> Day -> [Day]
enumFromThenTo (ModifiedJulianDay Integer
a) (ModifiedJulianDay Integer
b) (ModifiedJulianDay Integer
c) = (Integer -> Day) -> [Integer] -> [Day]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Integer -> Day
ModifiedJulianDay (Integer -> Integer -> Integer -> [Integer]
forall a. Enum a => a -> a -> a -> [a]
enumFromThenTo Integer
a Integer
b Integer
c)

-- necessary because H98 doesn't have "cunning newtype" derivation
instance Ix Day where
    range :: (Day, Day) -> [Day]
range (ModifiedJulianDay Integer
a,ModifiedJulianDay Integer
b) = (Integer -> Day) -> [Integer] -> [Day]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap Integer -> Day
ModifiedJulianDay ((Integer, Integer) -> [Integer]
forall a. Ix a => (a, a) -> [a]
range (Integer
a,Integer
b))
    index :: (Day, Day) -> Day -> Int
index (ModifiedJulianDay Integer
a,ModifiedJulianDay Integer
b) (ModifiedJulianDay Integer
c) = (Integer, Integer) -> Integer -> Int
forall a. Ix a => (a, a) -> a -> Int
index (Integer
a,Integer
b) Integer
c
    inRange :: (Day, Day) -> Day -> Bool
inRange (ModifiedJulianDay Integer
a,ModifiedJulianDay Integer
b) (ModifiedJulianDay Integer
c) = (Integer, Integer) -> Integer -> Bool
forall a. Ix a => (a, a) -> a -> Bool
inRange (Integer
a,Integer
b) Integer
c
    rangeSize :: (Day, Day) -> Int
rangeSize (ModifiedJulianDay Integer
a,ModifiedJulianDay Integer
b) = (Integer, Integer) -> Int
forall a. Ix a => (a, a) -> Int
rangeSize (Integer
a,Integer
b)

addDays :: Integer -> Day -> Day
addDays :: Integer -> Day -> Day
addDays Integer
n (ModifiedJulianDay Integer
a) = Integer -> Day
ModifiedJulianDay (Integer
a Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
+ Integer
n)

diffDays :: Day -> Day -> Integer
diffDays :: Day -> Day -> Integer
diffDays (ModifiedJulianDay Integer
a) (ModifiedJulianDay Integer
b) = Integer
a Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Integer
b