{-# LANGUAGE OverloadedStrings #-}

import           RatingChgkInfo
import           RatingChgkInfo.Types.Unsafe (TournamentId (..), PlayerId (..))

import           Data.Aeson
import           Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import           Data.Time
import           System.Directory (withCurrentDirectory)
import           System.Environment (getArgs)

main :: IO ()
main = do
  args <- getArgs
  case args of
    [rootDir, "town", townStr, town] -> withCurrentDirectory rootDir $ 
      case readMaybe townStr of
        Nothing -> usage
        Just townId -> workTown townId (T.pack town) Nothing >>= mapM_ print
    [rootDir, townPagesStr] -> withCurrentDirectory rootDir $ 
      case readMaybe townPagesStr of
        Nothing -> usage
        Just townPages -> work townPages
    _ -> usage

usage :: IO ()
usage = do
  die "Usage: calendar-rating <rootFolder> <townPages>"

work :: Int -> IO ()
work townPages = do
  ets <- fmap (fmap concat . sequence) $ forM [1..townPages] $ towns . Just
  case ets of
    Left err -> T.putStrLn $ decodeUtf8 err
    Right ts -> do
      ss <- forM ts $ \Town{ townId = ident, townName = town, townOtherName = other } -> do
        T.putStrLn town
        workTown ident town other
      encodeFile "names.json" $
        map fst $
        filter (not . null . snd) $
        zip ts ss

workTown :: Int -> Text -> Maybe Text -> IO [SynchTown]
workTown ident town other = do
  now <- getCurrentTime
  ests <- synchTown ident
  case ests of
    Left err -> T.putStrLn (decodeUtf8 err) >> pure []
    Right sts -> do
      let fname = "t" ++ show ident ++ ".ics"
      let events = filter ((==ClaimAccepted) . stStatus) sts
      unless (null events) $
        T.writeFile fname $ T.intercalate "\r\n"
        [ calStart
        , T.intercalate "\r\n" $
          map (mkEvent now town other) events
        , calEnd
        ]
      pure events

calStart :: Text
calStart = T.intercalate "\r\n"
  [ "BEGIN:VCALENDAR"
  , "VERSION:2.0"
  , "PRODID:-//calendar.chgk.me/EN"
  , "METHOD:PUBLISH"
  ]

calEnd :: Text
calEnd = "END:VCALENDAR"

mkEvent :: UTCTime -> Text -> Maybe Text -> SynchTown -> Text
mkEvent now town other SynchTown{ stTournamentId = TournamentId tid
                                , stTournament = tourn
                                , stRepresentativeId = PlayerId rid
                                , stRepresentative = rep
                                , stTime = time }
  = T.intercalate "\r\n"
    [ "BEGIN:VEVENT"
    , "UID:" `T.append` uid
    , "DTSTAMP:" `T.append` ts
    , "DTSTART;TZID=Europe/Moscow:" `T.append` start
    , "SUMMARY:" `T.append` summary
    , "ORGANIZER:" `T.append` org
    , "LOCATION:" `T.append` loc
    , "URL:" `T.append` url
    , "DESCRIPTION:" `T.append` desc
    , "END:VEVENT"
    ]
  where
    uid = T.concat [ "t", tid, "-r", rid, "@calendar.chgk.me" ]
    format :: FormatTime t => t -> Text
    format = T.pack . formatTime defaultTimeLocale "%Y%m%dT%H%M%S"
    ts = format now `T.append` "Z"
    start = format time
    summary = tourn
    org = rep
    loc = T.concat $ town : maybe [] pure other
    url = T.concat [ "https://rating.chgk.info/tournament/", tid ]
    desc = T.concat [ "Представитель: ", rep, "\\n", "Турнир: ", url]