    {-# 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
    (LocalTime -> LocalTime -> Bool)
    -> (LocalTime -> LocalTime -> Bool) -> Eq LocalTime
    forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
    $c== :: LocalTime -> LocalTime -> Bool
    == :: LocalTime -> LocalTime -> Bool
    $c/= :: LocalTime -> LocalTime -> Bool
    /= :: LocalTime -> LocalTime -> Bool
    Eq, Eq LocalTime
    Eq LocalTime =>
    (LocalTime -> LocalTime -> Ordering)
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    -> (LocalTime -> LocalTime -> Bool)
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    Ord, Typeable LocalTime
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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 () -> () -> ()
    forall a b. a -> b -> b
    `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)