{-# LANGUAGE DeriveGeneric, OverloadedStrings, FlexibleInstances #-}

{-|
Description: Common tools for working with Concrete data
-}
module Data.Concrete.Utils
       (
         getUUID
       , createAnnotationMetadata
       , writeCommunication
       , showCommunication
       , commToString
       , incrementUUID
       , stringToComm
       , getCompressor
       , getDecompressor
       ) where

import GHC.Generics
import Path.IO (resolveFile')
import Data.Concrete.Autogen.Communication_Types (Communication(..), default_Communication, read_Communication, write_Communication)
import Data.Concrete.Autogen.Structure_Types (Section(..), Sentence(..), Token(..), Tokenization(..), TokenList(..))
import Data.Concrete.Autogen.Uuid_Types (UUID(..))
import Data.Concrete.Autogen.Metadata_Types (AnnotationMetadata(..), default_AnnotationMetadata)
import Data.Concrete.Autogen.Spans_Types (TextSpan(..))
import Data.Concrete.Autogen.Service_Iface (Service_Iface(about, alive))
import Data.Concrete.Autogen.Services_Types (ServiceInfo(..))
import Data.Concrete.Autogen.Access_Types (FetchResult(..), default_FetchResult)
import Data.Concrete.Autogen.StoreCommunicationService_Iface (StoreCommunicationService_Iface(store))
import Data.Concrete.Autogen.FetchCommunicationService_Iface (FetchCommunicationService_Iface(fetch))
import qualified Data.Concrete.Autogen.StoreCommunicationService as StoreCommunicationService
import Data.Text
import Data.Either (rights)
import Data.Maybe (fromJust, maybeToList, fromMaybe)
import Data.ByteString.Lazy
import Data.Map
import Data.UUID.V4 (nextRandom)
import Data.UUID (toString, toWords, fromWords, fromString, nil)
import qualified Data.UUID as U
import qualified Data.Text.Lazy as T
import Thrift
import Thrift.Transport.Handle hiding (HandleSource)
import Thrift.Transport.Framed
import Thrift.Transport.Empty
import Thrift.Protocol.Compact
import Thrift.Protocol
import Thrift.Transport.IOBuffer
import Thrift.Transport
import Thrift.Server (runThreadedServer)
import qualified Data.List as L
import qualified Data.Map as Map
import qualified Data.ByteString as BSS
import qualified Data.ByteString.Lazy as BS
import qualified Codec.Compression.GZip as GZip
import qualified Codec.Compression.BZip as BZip
import qualified Codec.Archive.Tar       as Tar
import qualified Codec.Archive.Zip       as Zip
import qualified Codec.Archive.Tar.Entry as Tar
import qualified Codec.Archive.Tar.Index as Tar
import Data.Time
import Data.Time.Clock.POSIX
import System.FilePath (takeFileName, takeExtension, (</>), (<.>))
import Data.Either (rights)
import Control.Monad (liftM, join)
import Data.Foldable (foldr)
import System.IO (Handle)
import qualified Data.Vector as V
import qualified Data.Binary.Get as G
import qualified Control.Monad.Extra as E

-- | Returns appropriate compression based on a file name
getCompressor :: String -> (BS.ByteString -> BS.ByteString)
getCompressor f = case takeExtension f of
                    ".tgz" -> GZip.compress
                    ".gz" -> GZip.compress
                    ".bz2" -> BZip.compress
                    ".tbz2" -> BZip.compress
                    _ -> id

-- | Returns appropriate decompression based on a file name
getDecompressor :: String -> (BS.ByteString -> BS.ByteString)
getDecompressor f = case takeExtension f of
                      ".tgz" -> GZip.decompress
                      ".gz" -> GZip.decompress
                      ".bz2" -> BZip.decompress
                      ".tbz2" -> BZip.decompress
                      _ -> id

-- | Returns a randomly-generated Concrete UUID
getUUID :: IO UUID
getUUID = do
  uuid <- (T.pack . toString) <$> nextRandom
  return $ UUID uuid

-- | Increments the fourth section of a UUID by 1
incrementUUID :: UUID -> UUID
incrementUUID (UUID u) = case toWords (fromMaybe nil $ fromString (T.unpack u)) of
  (a, b, c, d) -> UUID $ (T.pack . toString) (fromWords a b c (d + 1))

-- | Serialize and write a Communication to a file handle
writeCommunication :: Handle -> Communication -> IO ()
writeCommunication out c = do
  t <- commToString c
  BS.hPutStr out t

-- | Convert a Tar entry to a byte string
entryToString :: Tar.EntryContent -> BS.ByteString
entryToString (Tar.NormalFile s _) = s

-- | A data type for treating strings as Thrift transports
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 ()

-- | Convert a Communication to a string using the Compact protocol
commToString :: Communication -> IO BS.ByteString
commToString c = do  
  otransport <- newTString
  let oproto = CompactProtocol otransport
  write_Communication oproto c
  flushBuf (getWrite otransport)

-- | Convert a string to a Communication using the Compact protocol
stringToComm :: BS.ByteString -> IO Communication
stringToComm s = do
  otransport@(TString r w) <- newTString
  fillBuf r s
  let oproto = CompactProtocol otransport
  read_Communication oproto

-- | Generate a Concrete AnnotationMetadata with the given tool name and current time
createAnnotationMetadata :: String -> IO AnnotationMetadata
createAnnotationMetadata s = do
  time <- round `fmap` getPOSIXTime
  return default_AnnotationMetadata { annotationMetadata_tool=T.pack s
                                    , annotationMetadata_timestamp=time
                                    }

-- | Reconstruct a Token given its Communication's text field
showToken :: T.Text -> Token -> T.Text
showToken t s = substr t (fromIntegral s') (fromIntegral e')
  where
    TextSpan s' e' = (fromJust . token_textSpan) s    

-- | Reconstruct a Sentence given its Communication's text field
showSentence :: T.Text -> Sentence -> T.Text
showSentence t s = if sentence_tokenization s == Nothing then full else T.intercalate " " (L.map (showToken t) (V.toList tokens))
  where
    TextSpan s' e' = (fromJust . sentence_textSpan) s    
    full = substr t (fromIntegral s') (fromIntegral e')
    tl = (fromJust . join) $ tokenization_tokenList <$> sentence_tokenization s
    tokens = tokenList_tokenList tl

-- | Reconstruct a Section given its Communication's text field
showSection :: T.Text -> Section -> T.Text
showSection t s = if sentences == Nothing then full else T.intercalate "\n" (L.map (showSentence t) (fromJust sentences))
  where
    sentences = V.toList <$> section_sentenceList s
    TextSpan s' e' = (fromJust . section_textSpan) s    
    k = section_kind s
    t' = substr t (fromIntegral s') (fromIntegral e')
    full = T.concat ["    ", ((fromMaybe "*NO LABEL*" . section_label) s), " == ", t']

-- | Construct a human-readable Communication
showCommunication :: Communication -> T.Text
showCommunication c = T.concat [communication_id c, " ", communication_type c, "\n  Content sections:\n", T.intercalate "\n" contentSects, "\n  ", metadataText]
  where
    tt = (T.pack . show) c
    ss = L.concat $ L.map V.toList (maybeToList (communication_sectionList c))
    t = (fromJust . communication_text) c
    contentSects = L.map (showSection t) ((L.filter (\x -> section_kind x == "content")) ss)
    metadataSects = L.map (fromMaybe "?" . section_label) ((L.filter (\x -> section_kind x /= "content")) ss)
    metadataText = T.concat [(T.pack . show) (L.length metadataSects), " metadata sections"]

-- | Extract a substring from a Text
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