{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE TupleSections #-}

import Data.Map (Map)
import qualified Data.Map as Map
import Data.Sequence (Seq)
import qualified Data.Sequence as Seq
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import qualified Data.Text.Encoding as T
import qualified Data.ByteString.Lazy.Char8 as Lazy (ByteString)
import qualified Data.ByteString.Lazy as LBS
import qualified Data.ByteString.Lazy.Char8 as LCBS
import Data.Time

import Data.Foldable
import Data.List
import Data.Monoid
import Data.Maybe
import Data.Either
import Data.Bool

import Control.Monad
import Control.Monad.Catch
import Control.DeepSeq
import Control.Concurrent (threadDelay)

import Text.Show.Pretty (dumpStr)
import Data.Aeson.Encode.Pretty (encodePretty)
import Data.Aeson (eitherDecode', eitherDecodeStrict')

import Text.Editor (runUserEditorDWIM, jsonTemplate, plainTemplate)

import System.IO

import Thermoprint.Printout.BBCode
import Thermoprint.Client
import Options

import Debug.Trace

main :: IO ()
main = withArgs (main' <=< dumpOpts)
  where
    dumpOpts c@(TPrint{..}) = c <$ when (dumpOptions) (hPutStrLn stderr $ dumpStr c)
    main' config@(TPrint{..}) = withOutput config $ tprint config (mkClient' baseUrl)

withOutput :: TPrint -> (Handle -> IO a) -> IO a
withOutput TPrint{..}
  | (_, WriteFile f) <- output = withFile f WriteMode
  | otherwise = ($ stdout)

withInput :: Input -> (Handle -> IO a) -> IO a
withInput (_, Stdin) = ($ stdin)
withInput (_, ReadFile f) = withFile f ReadMode

withPrintout :: Input -> (Printout -> IO a) -> IO a
withPrintout input a = withInput input $ \inH -> do
  let
    p'
      | (BBCode, _) <- input = either throwM return . bbcode =<< T.hGetContents inH
      | otherwise = either (throwM . userError) return . eitherDecode' =<< LCBS.hGetContents inH
  a =<< (force <$> p')

humanJobStatus :: JobStatus -> Maybe PrinterId -> String
humanJobStatus (Queued (PrinterId n)) Nothing = "queued at printer #" ++ show n
humanJobStatus (Queued _) _ = "queued"
humanJobStatus (Printing (PrinterId n)) Nothing = "printing on printer #" ++ show n
humanJobStatus (Printing _) _ = "printing"
humanJobStatus (Done) _ = "finished successfully"
humanJobStatus (Failed err) _ = "failed: " ++ show err

blockLoop :: Client IO -> Handle -> JobId -> IO ()  
blockLoop client@Client{..} out jId@(JobId n) = do
  threadDelay (10^6)
  status <- jobStatus jId
  case status of
    Done -> hPutStrLn out $ show n
    Failed err -> throwM err
    _ -> blockLoop client out jId

tprint :: TPrint -> Client IO -> Handle -> IO ()

-- Query
tprint TPrint{ operation = Printers, ..} Client{..} out = printers >>= format
  where format ps
          | (Human, _) <- output = mapM_ (\(PrinterId n, st) -> hPutStrLn out $ show n ++ "\t" ++ humanStatus st) $ Map.toAscList ps
          | (JSON , _) <- output = LCBS.hPutStrLn out $ encodePretty ps
          | otherwise            = hPutStrLn out . dumpStr $ Map.toAscList ps
        humanStatus (Busy (JobId n)) = "busy printing job #" ++ show n
        humanStatus (Available)      = "available"

tprint TPrint{ operation = Jobs{..}, ..} Client{..} out = jobs printer jobRange timeRange >>= format
  where format js
          | (Human, _) <- output = mapM_ (\((JobId n), created, status) -> hPutStrLn out $ show n ++ "\t" ++ formatTime defaultTimeLocale "%Y-%m-%d %H:%M:%S %Z" created ++ "\t" ++ humanJobStatus status printer) . sortBy jSort $ toList js
          | (JSON, _) <- output  = LCBS.hPutStrLn out $ encodePretty js
          | otherwise            = hPutStrLn out . dumpStr $ toList js
        jSort (id, time, status) (id', time', status') = queueSort status status' <> compare time' time <> compare id id'

tprint TPrint{ operation = Drafts, ..} Client{..} out = drafts >>= format
  where format ds
          | (Human, _) <- output = mapM_ (\(DraftId n, fromMaybe "" . fmap T.unpack -> t) -> hPutStrLn out $ show n ++ "\t" ++ t) $ Map.toAscList ds
          | (JSON, _) <- output  = LCBS.hPutStrLn out $ encodePretty ds
          | otherwise            = hPutStrLn out . dumpStr $ Map.toAscList ds

tprint TPrint{ operation = JobStatus{..}, ..} Client{..} out = jobStatus jobId >>= format
  where format s
          | (Human, _) <- output = hPutStrLn out $ humanJobStatus s Nothing
          | (JSON, _) <- output  = LCBS.hPutStrLn out $ encodePretty s
          | otherwise            = hPutStrLn out $ dumpStr s
        
tprint TPrint{ operation = Job{..}, ..} Client{..} out = job jobId >>= format
  where format p
          | (JSON, _) <- output = LCBS.hPutStrLn out $ encodePretty p
          | otherwise           = T.hPutStrLn out =<< either throwM return (cobbcode p)

tprint TPrint{ operation = Draft{..}, ..} Client{..} out = draft draftId >>= format
  where format d@(fromMaybe "" . fmap T.unpack -> t, p)
          | (JSON, _) <- output = LCBS.hPutStrLn out $ encodePretty d
          | otherwise           = do
              hPutStrLn out t
              hPutStrLn out ""
              T.hPutStrLn out =<< either throwM return (cobbcode p)

-- Mutate
tprint TPrint{ operation = JobCreate{..}, ..} client@Client{..} out = withPrintout input $ \p -> do
  let
    block'
      | block = blockLoop client out
      | otherwise = hPutStrLn out . show
  unless dryRun $ block' =<< jobCreate printer p

tprint TPrint{ operation = JobDelete{..}, ..} Client{..} _ = unless dryRun $ jobDelete jobId

tprint TPrint{ operation = DraftCreate{..}, ..} Client{..} out = withPrintout input $ \p -> do
  unless dryRun $ hPutStrLn out . show =<< draftCreate draftTitle p

tprint TPrint{ operation = DraftReplace{..}, ..} Client{..} _ = withPrintout input $ \p -> do
  unless dryRun $ draftReplace draftId draftTitle p

tprint TPrint{ operation = DraftEdit{..}, ..} Client{..} _ = do
  d@(fromMaybe T.empty -> dTitle, dContent) <- draft draftId
  let
    content
      | (JSON, _) <- output = return . LBS.toStrict $ encodePretty d
      | otherwise           = do
          c <- either throwM return (cobbcode dContent)
          return . T.encodeUtf8 $ dTitle <> T.pack "\n" <> c
    tmpl
      | (JSON, _) <- output = jsonTemplate
      | otherwise           = plainTemplate
    parse
      | (JSON, _) <- output = either (throwM . userError) return . eitherDecodeStrict'
      | otherwise           = (\(t:(T.unlines -> c)) -> (massage t, ) <$> either throwM return (bbcode c)) . T.lines . T.decodeUtf8
    massage (T.strip -> t)
      | T.null t = Nothing
      | otherwise = Just t
  (dTitle', dContent') <- parse =<< runUserEditorDWIM tmpl =<< content
  unless dryRun $ draftReplace draftId dTitle' dContent'

tprint TPrint{ operation = DraftDelete{..}, ..} Client{..} _ = unless dryRun $ draftDelete draftId

tprint TPrint{ operation = DraftPrint{..}, ..} client@Client{..} out = do
  let block'
        | block = blockLoop client out
        | otherwise = hPutStrLn out . show
  unless dryRun $ block' =<< draftPrint draftId printer


tprint _ _ _ = undefined