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|
{-# LANGUAGE OverloadedStrings #-}
module Main
( main
) where
import System.IO (stderr)
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Date (getCurrentDate)
import Birthdate (Birthdate, filterBirthdayAt)
import BirthdateParser (parseBirthdates)
import Mail (mailSubject, mailBody)
import SendMail (sendMail)
import Config
birthdatePath :: FilePath
birthdatePath = "birthdates.csv"
configPath :: FilePath
configPath = "config.txt"
main :: IO ()
main = do
eitherBirthdates <- parseBirthdates <$> T.readFile birthdatePath
eitherConfig <- getConfig configPath
case (eitherBirthdates, eitherConfig) of
(Left err, _) ->
birthdateError err
(_, Left err) ->
configError err
(Right birthdates, Right config) ->
sendNotificationForBirthdayToday birthdates config
birthdateError :: Text -> IO ()
birthdateError err =
T.hPutStr stderr $
T.concat
[ "Error while parsing file "
, T.pack birthdatePath
, ":\n"
, err
]
configError :: Text -> IO ()
configError err =
T.hPutStr stderr $
T.concat
[ "Error while parsing config file "
, T.pack configPath
, ":\n"
, err
]
sendNotificationForBirthdayToday :: [Birthdate] -> Config -> IO ()
sendNotificationForBirthdayToday birthdates config = do
currentDate <- getCurrentDate
let birthdays = filterBirthdayAt currentDate birthdates
if not (null birthdays)
then
sendMail
(mailTo config)
(mailFrom config)
(mailSubject birthdays)
(mailBody currentDate birthdays)
else
return ()
|
