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{-# LANGUAGE OverloadedStrings #-}
module AdListener
( start
) where
import Prelude hiding (error)
import Data.Text (Text)
import qualified Data.Text.IO as T
import qualified Data.Text.Lazy as LT
import Data.Text.Lazy.Builder (toLazyText, fromText)
import Control.Concurrent (threadDelay)
import Fetch (fetchResumes, fetchAds)
import Model.Ad
import Model.URL
import Model.Resume
import qualified View.Plain.Ad as P
import qualified View.Html.Ad as H
import Mail
import Model.Mail (Mail(Mail))
import Conf (Conf)
import qualified Conf
import Time (getCurrentFormattedTime)
start :: Conf -> IO ()
start conf = do
eitherResumes <- fetchResumes (Conf.url conf)
case eitherResumes of
Left error ->
showErrorAndListenBack conf [] error
Right resumes -> do
let newURLs = map url resumes
T.putStrLn "Listening to new ads…"
waitListenInterval conf
listenToNewAdsWithViewedURLs conf newURLs
listenToNewAdsWithViewedURLs :: Conf -> [URL] -> IO ()
listenToNewAdsWithViewedURLs conf viewedURLs = do
eitherResumes <- fetchResumes (Conf.url conf)
case eitherResumes of
Left error ->
showErrorAndListenBack conf viewedURLs error
Right resumes ->
listenToNewAdsWithResumes conf viewedURLs resumes
listenToNewAdsWithResumes :: Conf -> [URL] -> [Resume] -> IO ()
listenToNewAdsWithResumes conf viewedURLs resumes =
let (newURLs, newResumes) = getNewResumes viewedURLs resumes
in do
eitherNewAds <- fetchAds newResumes
case eitherNewAds of
Left error ->
showErrorAndListenBack conf viewedURLs error
Right newAds -> do
time <- getCurrentFormattedTime
if not (null newAds)
then
let message = P.renderConsoleAds conf time newAds
in do
T.putStrLn message
trySendMail conf newAds
else
return ()
waitListenInterval conf
listenToNewAdsWithViewedURLs conf (viewedURLs ++ newURLs)
trySendMail :: Conf -> [Ad] -> IO ()
trySendMail conf ads =
let (title, plainBody) = P.renderAds conf ads
htmlBody = H.renderAds conf ads
mail = Mail (Conf.mailFrom conf) (Conf.mailTo conf) title (strictToLazy plainBody) (strictToLazy htmlBody)
in Mail.send mail >> return ()
strictToLazy :: Text -> LT.Text
strictToLazy = toLazyText . fromText
showErrorAndListenBack :: Conf -> [URL] -> Text -> IO ()
showErrorAndListenBack conf viewedURLs error = do
T.putStrLn error
waitListenInterval conf
listenToNewAdsWithViewedURLs conf viewedURLs
waitListenInterval :: Conf -> IO ()
waitListenInterval = threadDelay . (*) 1000000 . round . Conf.listenInterval
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