-----------------------------------------------------------------------------
-- |
-- Module      :  Data.Time
-- Copyright   :  (c) 2020-2021 EMQ Technologies Co., Ltd.
-- License     :  BSD-style (see the LICENSE file)
--
-- Maintainer  :  Feng Lee, feng@emqx.io
--                Yang M, yangm@emqx.io
-- Stability   :  experimental
-- Portability :  portable
--
-- The Time datatype.
--
-----------------------------------------------------------------------------
module Data.Time where

import Control.Monad
import Foreign (ffi1, ffi2)

type Time = (Integer, Integer, Integer)
type Date = (Integer, Integer, Integer)
type DateTime = (Date, Time)
type YearWeek = (Integer, Integer)

data TimeUnit
  = Second
  | Millisecond
  | Microsecond
  | Nanosecond
  | Native
  | PerfCounter

type UTCTime = (Integer, Integer, Integer)

foreign import getCurrentTime :: IO UTCTime
foreign import getLocalTime :: IO DateTime
foreign import getIsoWeekNumber :: IO Integer
foreign import getUniversalTime :: IO DateTime

dateToGregorianDays :: Date -> Integer
dateToGregorianDays = ffi1 :calendar :date_to_gregorian_days

datetimeToGregorianSeconds :: DateTime -> Integer
datetimeToGregorianSeconds = ffi1 :calendar :datetime_to_gregorian_seconds

dayOfTheWeek :: Date -> Integer
dayOfTheWeek = ffi1 :calendar :day_of_the_week

gregorianDaysToDate :: Integer -> Date
gregorianDaysToDate = ffi1 :calendar :gregorian_days_to_date

gregorianSecondsToDateTime :: Integer -> DateTime
gregorianSecondsToDateTime = ffi1 :calendar :gregorian_seconds_to_datetime

isLeapYear :: Integer -> Boolean
isLeapYear = ffi1 :calendar :is_leap_year

isoWeekNumber :: Date -> YearWeek
isoWeekNumber = ffi1 :calendar :iso_week_number

lastDayOfTheMonth :: Integer -> Integer -> Integer
lastDayOfTheMonth = ffi2 :calendar :last_day_of_the_month

localTimeToUniversalTime :: DateTime -> [DateTime]
localTimeToUniversalTime = ffi1 :calendar :local_time_to_universal_time_dst

nowToDateTime :: UTCTime -> DateTime
nowToDateTime = ffi1 :calendar :now_to_datetime

nowToLocalTime :: UTCTime -> DateTime
nowToLocalTime = ffi1 :calendar :now_to_local_time

nowToUniversalTime :: UTCTime -> DateTime
nowToUniversalTime = ffi1 :calendar :now_to_universal_time

foreign import rfc3339ToSeconds :: String -> Integer
foreign import rfc3339ToNanoseconds :: String -> Integer
foreign import rfc3339ToMilliseconds :: String -> Integer
foreign import rfc3339ToMicroseconds :: String -> Integer

secondsToDaysTime :: Integer -> (Integer, Time)
secondsToDaysTime = ffi1 :calendar :seconds_to_daystime

secondsToTime :: Integer -> Time
secondsToTime = ffi1 :calendar :seconds_to_time

foreign import systemTimeToLocalTime :: Integer -> TimeUnit -> DateTime
foreign import systemTimeToUniversalTime :: Integer -> TimeUnit -> DateTime

foreign import secondsToRfc3339 :: Integer -> String
foreign import nanosecondsToRfc3339 :: Integer -> String
foreign import millisecondsToRfc3339 :: Integer -> String
foreign import microsecondsToRfc3339 :: Integer -> String

timeToSeconds :: Time -> Integer
timeToSeconds = ffi1 :calendar :time_to_seconds

universalTimeToLocalTime :: DateTime -> DateTime
universalTimeToLocalTime = ffi1 :calendar :universal_time_to_local_time

isValidDate :: Date -> Boolean
isValidDate = ffi1 :calendar :valid_date