{-# LANGUAGE Safe #-}

{-# OPTIONS -fno-warn-orphans #-}

module Data.Time.LocalTime.Internal.LocalTime (
    -- * Local Time
    LocalTime (..),
    addLocalTime,
    diffLocalTime,
    -- converting UTC and UT1 times to LocalTime
    utcToLocalTime,
    localTimeToUTC,
    ut1ToLocalTime,
    localTimeToUT1,
) where

import Control.DeepSeq
import Data.Data
import Data.Time.Calendar.Days
import Data.Time.Calendar.Gregorian
import Data.Time.Clock.Internal.NominalDiffTime
import Data.Time.Clock.Internal.UTCDiff
import Data.Time.Clock.Internal.UTCTime
import Data.Time.Clock.Internal.UniversalTime
import Data.Time.LocalTime.Internal.TimeOfDay
import Data.Time.LocalTime.Internal.TimeZone

-- | A simple day and time aggregate, where the day is of the specified parameter,
-- and the time is a TimeOfDay.
-- Conversion of this (as local civil time) to UTC depends on the time zone.
-- Conversion of this (as local mean time) to UT1 depends on the longitude.
data LocalTime = LocalTime
    { LocalTime -> Day
localDay :: Day
    , LocalTime -> TimeOfDay
localTimeOfDay :: TimeOfDay
    }
    deriving (LocalTime -> LocalTime -> Bool
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instance NFData LocalTime where
    rnf :: LocalTime -> ()
rnf (LocalTime Day
d TimeOfDay
t) = Day -> ()
forall a. NFData a => a -> ()
rnf Day
d () -> () -> ()
forall a b. a -> b -> b
`seq` TimeOfDay -> ()
forall a. NFData a => a -> ()
rnf TimeOfDay
t () -> () -> ()
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`seq` ()

instance Show LocalTime where
    show :: LocalTime -> String
show (LocalTime Day
d TimeOfDay
t) = (Day -> String
showGregorian Day
d) String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
" " String -> ShowS
forall a. [a] -> [a] -> [a]
++ (TimeOfDay -> String
forall a. Show a => a -> String
show TimeOfDay
t)

-- | addLocalTime a b = a + b
addLocalTime :: NominalDiffTime -> LocalTime -> LocalTime
addLocalTime :: NominalDiffTime -> LocalTime -> LocalTime
addLocalTime NominalDiffTime
x = TimeZone -> UTCTime -> LocalTime
utcToLocalTime TimeZone
utc (UTCTime -> LocalTime)
-> (LocalTime -> UTCTime) -> LocalTime -> LocalTime
forall b c a. (b -> c) -> (a -> b) -> a -> c
. NominalDiffTime -> UTCTime -> UTCTime
addUTCTime NominalDiffTime
x (UTCTime -> UTCTime)
-> (LocalTime -> UTCTime) -> LocalTime -> UTCTime
forall b c a. (b -> c) -> (a -> b) -> a -> c
. TimeZone -> LocalTime -> UTCTime
localTimeToUTC TimeZone
utc

-- | diffLocalTime a b = a - b
diffLocalTime :: LocalTime -> LocalTime -> NominalDiffTime
diffLocalTime :: LocalTime -> LocalTime -> NominalDiffTime
diffLocalTime LocalTime
a LocalTime
b = UTCTime -> UTCTime -> NominalDiffTime
diffUTCTime (TimeZone -> LocalTime -> UTCTime
localTimeToUTC TimeZone
utc LocalTime
a) (TimeZone -> LocalTime -> UTCTime
localTimeToUTC TimeZone
utc LocalTime
b)

-- | Get the local time of a UTC time in a time zone.
utcToLocalTime :: TimeZone -> UTCTime -> LocalTime
utcToLocalTime :: TimeZone -> UTCTime -> LocalTime
utcToLocalTime TimeZone
tz (UTCTime Day
day DiffTime
dt) = Day -> TimeOfDay -> LocalTime
LocalTime (Integer -> Day -> Day
addDays Integer
i Day
day) TimeOfDay
tod
  where
    (Integer
i, TimeOfDay
tod) = TimeZone -> TimeOfDay -> (Integer, TimeOfDay)
utcToLocalTimeOfDay TimeZone
tz (DiffTime -> TimeOfDay
timeToTimeOfDay DiffTime
dt)

-- | Get the UTC time of a local time in a time zone.
localTimeToUTC :: TimeZone -> LocalTime -> UTCTime
localTimeToUTC :: TimeZone -> LocalTime -> UTCTime
localTimeToUTC TimeZone
tz (LocalTime Day
day TimeOfDay
tod) = Day -> DiffTime -> UTCTime
UTCTime (Integer -> Day -> Day
addDays Integer
i Day
day) (TimeOfDay -> DiffTime
timeOfDayToTime TimeOfDay
todUTC)
  where
    (Integer
i, TimeOfDay
todUTC) = TimeZone -> TimeOfDay -> (Integer, TimeOfDay)
localToUTCTimeOfDay TimeZone
tz TimeOfDay
tod

-- | Get the local time of a UT1 time on a particular meridian (in degrees, positive is East).
ut1ToLocalTime :: Rational -> UniversalTime -> LocalTime
ut1ToLocalTime :: Rational -> UniversalTime -> LocalTime
ut1ToLocalTime Rational
long (ModJulianDate Rational
date) =
    Day -> TimeOfDay -> LocalTime
LocalTime (Integer -> Day
ModifiedJulianDay Integer
localMJD) (Rational -> TimeOfDay
dayFractionToTimeOfDay Rational
localToDOffset)
  where
    localTime :: Rational
localTime = Rational
date Rational -> Rational -> Rational
forall a. Num a => a -> a -> a
+ Rational
long Rational -> Rational -> Rational
forall a. Fractional a => a -> a -> a
/ Rational
360 :: Rational
    localMJD :: Integer
localMJD = Rational -> Integer
forall b. Integral b => Rational -> b
forall a b. (RealFrac a, Integral b) => a -> b
floor Rational
localTime
    localToDOffset :: Rational
localToDOffset = Rational
localTime Rational -> Rational -> Rational
forall a. Num a => a -> a -> a
- (Integer -> Rational
forall a b. (Integral a, Num b) => a -> b
fromIntegral Integer
localMJD)

-- | Get the UT1 time of a local time on a particular meridian (in degrees, positive is East).
localTimeToUT1 :: Rational -> LocalTime -> UniversalTime
localTimeToUT1 :: Rational -> LocalTime -> UniversalTime
localTimeToUT1 Rational
long (LocalTime (ModifiedJulianDay Integer
localMJD) TimeOfDay
tod) =
    Rational -> UniversalTime
ModJulianDate ((Integer -> Rational
forall a b. (Integral a, Num b) => a -> b
fromIntegral Integer
localMJD) Rational -> Rational -> Rational
forall a. Num a => a -> a -> a
+ (TimeOfDay -> Rational
timeOfDayToDayFraction TimeOfDay
tod) Rational -> Rational -> Rational
forall a. Num a => a -> a -> a
- (Rational
long Rational -> Rational -> Rational
forall a. Fractional a => a -> a -> a
/ Rational
360))

-- orphan instance
instance Show UniversalTime where
    show :: UniversalTime -> String
show UniversalTime
t = LocalTime -> String
forall a. Show a => a -> String
show (Rational -> UniversalTime -> LocalTime
ut1ToLocalTime Rational
0 UniversalTime
t)