{-# LANGUAGE DeriveGeneric, OverloadedStrings #-}
module Data.Concrete.Utils
       (
         getUUID
       , createAnnotationMetadata
       , readCommunicationsFromBytes
       , writeCommunications
       , writeCommunication
       , showCommunication
       ) where

import GHC.Generics
import qualified Data.Concrete as C
import Data.Concrete (Communication(..), UUID(..), default_Communication, read_Communication)
import Data.Text
import Data.Maybe (fromJust, maybeToList)
import Data.ByteString.Lazy
import Data.Map
import Data.UUID.V4 (nextRandom)
import Data.UUID (toString)
import qualified Data.Text.Lazy as T
import Thrift
import Thrift.Transport.Handle
import Thrift.Transport.Framed
import Thrift.Transport.Empty
import Thrift.Protocol.Compact
import Thrift.Protocol.JSON
import Thrift.Transport.IOBuffer
import Thrift.Transport
import qualified Data.List as L
import qualified Data.ByteString.Lazy as BS
import qualified Codec.Compression.GZip as GZip
import qualified Codec.Archive.Tar       as Tar
import qualified Codec.Archive.Tar.Entry as Tar
import Data.Time
import Data.Time.Clock.POSIX
import System.FilePath (takeFileName, (</>), (<.>))
import Data.Either (rights)
import Control.Monad (liftM)
import Data.Foldable (foldr)
import System.IO (Handle)
import qualified Data.Vector as V

getUUID :: IO UUID
getUUID = do
  uuid <- (T.pack . toString) <$> nextRandom
  return $ UUID uuid

writeCommunications :: Handle -> [Communication] -> IO ()
writeCommunications out cs = do
  let tarPath = "comms"
  texts <- sequence [commToString c | c <- cs]
  let names = rights [Tar.toTarPath False (tarPath </> ((T.unpack . C.communication_id) c) <.> "comm") | c <- cs]
      entries = [Tar.fileEntry n t|(n, t) <- L.zip names texts]
      t = Tar.write entries
  (BS.hPutStr out . GZip.compress) t

writeCommunication :: Handle -> Communication -> IO ()
writeCommunication out c = do
  t <- commToString c
  (BS.hPutStr out . GZip.compress) t

readCommunicationsFromBytes :: BS.ByteString -> IO [Communication]
readCommunicationsFromBytes t = do
  --t <- (liftM GZip.decompress . BS.readFile) f
  transport <- newTString
  fillBuf (getRead transport) t
  let iproto = CompactProtocol transport
  readCommunication' iproto []
  where
    readCommunication' pr cs = do
      o <- tIsOpen $ getTransport pr      
      case o of
        True -> do
          c <- read_Communication pr
          readCommunication' pr $ c:cs
        False -> return cs

entryToString :: Tar.EntryContent -> BS.ByteString
entryToString (Tar.NormalFile s _) = s

data TString = TString ReadBuffer WriteBuffer

getWrite :: TString -> WriteBuffer
getWrite (TString r w) = w

getRead :: TString -> ReadBuffer
getRead (TString r w) = r          

newTString = do
  w <- newWriteBuffer
  r <- newReadBuffer
  return $ TString r w

instance Transport TString where
    tIsOpen (TString r w) = do
      p <- peekBuf r
      case p of
        Nothing -> return False
        _ -> return True
    tClose (TString r w) = case peekBuf r of
                             _ -> return ()
    tRead (TString r w) i = readBuf r i
    tPeek (TString r w) = peekBuf r
    tWrite (TString r w) bs = writeBuf w bs
    tFlush (TString r w) = flushBuf w >> return ()
  
commToString :: Communication -> IO BS.ByteString
commToString c = do
  otransport <- newTString
  let oproto = CompactProtocol otransport
  C.write_Communication oproto c
  flushBuf (getWrite otransport)

stringToComm :: BS.ByteString -> IO Communication
stringToComm s = do
  otransport@(TString r w) <- newTString
  fillBuf r s
  let oproto = CompactProtocol otransport
  C.read_Communication oproto

dropTarSuffix :: String -> String
dropTarSuffix f = (L.reverse . L.drop n . L.reverse) f
  where
    n = if ".tgz" `L.isSuffixOf` f then 4 else if ".tar.gz" `L.isSuffixOf` f then 7 else 0

createAnnotationMetadata :: String -> IO C.AnnotationMetadata
createAnnotationMetadata s = do
  time <- round `fmap` getPOSIXTime
  return C.default_AnnotationMetadata { C.annotationMetadata_tool=T.pack s
                                      , C.annotationMetadata_timestamp=time
                                      }

showSection :: T.Text -> C.Section -> T.Text
showSection t s = T.concat ["\t", ((fromJust . C.section_label) s), " ", (C.section_kind s), "--->", t']
  where
    C.TextSpan s' e' = (fromJust . C.section_textSpan) s
    t' = substr t (fromIntegral s') (fromIntegral e')

substr :: T.Text -> Int -> Int -> T.Text
substr t s e = res
  where
    (_, start) = T.splitAt (fromIntegral s) t    
    res = T.take (fromIntegral $ e - s) start

showCommunication :: Communication -> T.Text
showCommunication c = T.concat [C.communication_id c, " ", C.communication_type c, "\n", T.intercalate "\n" sects, "\n"]
  where    
    ss = L.concat $ L.map V.toList (maybeToList (C.communication_sectionList c))
    t = (fromJust . C.communication_text) c
    sects = L.map (showSection t) ss