{-|
Module      : Gargantext.API.Ngrams.List
Description : Get Ngrams (lists)
Copyright   : (c) CNRS, 2017-Present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX

-}

{-# LANGUAGE MonoLocalBinds #-}
{-# LANGUAGE TemplateHaskell   #-}
{-# LANGUAGE TypeOperators     #-}

module Gargantext.API.Ngrams.List
  where

import Control.Lens hiding (elements, Indexed)
import Data.Aeson
import qualified Data.ByteString.Lazy as BSL
import qualified Data.Csv as Csv
import Data.Either (Either(..))
import Data.HashMap.Strict (HashMap)
import qualified Data.HashMap.Strict as HashMap
import qualified Data.List           as List
import Data.Map (Map, toList, fromList)
import qualified Data.Map            as Map
import Data.Maybe (catMaybes)
import Data.Set (Set)
import Data.Text (Text, concat, pack)
import qualified Data.Text           as Text
import Data.Vector (Vector)
import qualified Data.Vector as Vec
import Network.HTTP.Media ((//), (/:))
import qualified Prelude as Prelude
import Servant
import Servant.Job.Async

import qualified Protolude as P

import Gargantext.API.Admin.Orchestrator.Types
import Gargantext.API.Ngrams (getNgramsTableMap, setListNgrams)
import Gargantext.API.Ngrams.List.Types
import Gargantext.API.Ngrams.Tools (getTermsWith)
import Gargantext.API.Ngrams.Types
import Gargantext.API.Prelude (GargServer)
import Gargantext.Core.Text.Terms (ExtractedNgrams(..))
import Gargantext.Core.Text.Terms.WithList (buildPatterns, termsInText)
import Gargantext.Core.Types.Main (ListType(..))
import Gargantext.Database.Action.Flow (saveDocNgramsWith)
import Gargantext.Database.Action.Flow.Types (FlowCmdM)
import Gargantext.Database.Action.Metrics.NgramsByNode (getOccByNgramsOnlyFast')
import Gargantext.Database.Admin.Types.Hyperdata.Document
import Gargantext.Database.Admin.Types.Node
import Gargantext.Database.Query.Table.NodeNode (selectDocNodes)
import Gargantext.Database.Schema.Ngrams
import Gargantext.Database.Schema.Node
import Gargantext.Database.Types (Indexed(..))
import Gargantext.Prelude

------------------------------------------------------------------------
{-
-- | TODO refactor 
type API =  Get '[JSON, HTML] (Headers '[Header "Content-Disposition" Text] NgramsList)
       -- :<|> ReqBody '[JSON] NgramsList :> Post '[JSON] Bool
       :<|> PostAPI
       :<|> CSVPostAPI

api :: ListId -> GargServer API
api l = get l :<|> postAsync l :<|> csvPostAsync l
-}


----------------------
type GETAPI = Summary "Get List"
            :> "lists"
              :> Capture "listId" ListId
            :> Get '[JSON, HTML] (Headers '[Header "Content-Disposition" Text] NgramsList)
getApi :: GargServer GETAPI
getApi = get

data HTML
instance Accept HTML where
  contentType _ = "text" // "html" /: ("charset", "utf-8")
instance ToJSON a => MimeRender HTML a where
  mimeRender _ = encode


----------------------
type JSONAPI = Summary "Update List"
          :> "lists"
            :> Capture "listId" ListId
          :> "add"
          :> "form"
          :> "async"
            :> AsyncJobs JobLog '[FormUrlEncoded] WithFile JobLog

jsonApi :: GargServer JSONAPI
jsonApi = postAsync

----------------------
type CSVAPI = Summary "Update List (legacy v3 CSV)"
          :> "lists"
            :> Capture "listId" ListId
          :> "csv"
          :> "add"
          :> "form"
          :> "async"
            :> AsyncJobs JobLog '[FormUrlEncoded] WithTextFile JobLog

csvApi :: GargServer CSVAPI
csvApi = csvPostAsync

----------------------



------------------------------------------------------------------------
get :: RepoCmdM env err m =>
       ListId -> m (Headers '[Header "Content-Disposition" Text] NgramsList)
get lId = do
  lst <- get' lId
  let (NodeId id') = lId
  return $ addHeader (concat [ "attachment; filename=GarganText_NgramsList-"
                             , pack $ show id'
                             , ".json"
                             ]
                     ) lst

get' :: RepoCmdM env err m
    => ListId -> m NgramsList
get' lId = fromList
       <$> zip ngramsTypes
       <$> mapM (getNgramsTableMap lId) ngramsTypes

------------------------------------------------------------------------
-- TODO : purge list
-- TODO talk
post :: FlowCmdM env err m
    => ListId
    -> NgramsList
    -> m Bool
post l m  = do
  -- TODO check with Version for optim
  printDebug "New list as file" l
  _ <- mapM (\(nt, Versioned _v ns) -> setListNgrams l nt ns) $ toList m
  -- TODO reindex
  pure True


-----------------------------------------------------------------------------
-- | Re-index documents of a corpus with new ngrams (called orphans here)
reIndexWith :: ( HasRepo env
               , FlowCmdM env err m
               )
            => CorpusId
            -> ListId
            -> NgramsType
            -> Set ListType
            -> m ()
reIndexWith cId lId nt lts = do
  -- Getting [NgramsTerm]
  ts <- List.concat
     <$> map (\(k,vs) -> k:vs)
     <$> HashMap.toList
     <$> getTermsWith identity [lId] nt lts
  
  -- printDebug "ts" ts

  -- Taking the ngrams with 0 occurrences only (orphans)
  occs <- getOccByNgramsOnlyFast' cId lId nt ts

  -- printDebug "occs" occs

  let orphans = List.concat 
              $ map (\t -> case HashMap.lookup t occs of
                       Nothing -> [t]
                       Just n  -> if n <= 1 then [t] else [ ]
                       ) ts

  -- printDebug "orphans" orphans

  -- Get all documents of the corpus
  docs <- selectDocNodes cId
  -- printDebug "docs length" (List.length docs)

  -- Checking Text documents where orphans match
  -- TODO Tests here
  let
    ngramsByDoc = map (HashMap.fromList)
                $ map (map (\(k,v) -> (SimpleNgrams (text2ngrams k), v)))
                $  map (\doc -> List.zip
                                (termsInText (buildPatterns $ map (\k -> (Text.splitOn " " $ unNgramsTerm k, [])) orphans)
                                             $ Text.unlines $ catMaybes
                                               [ doc ^. node_hyperdata . hd_title
                                               , doc ^. node_hyperdata . hd_abstract
                                               ]
                                 )
                                (List.cycle [Map.fromList $ [(nt, Map.singleton (doc ^. node_id) 1 )]])
                        ) docs

  -- printDebug "ngramsByDoc" ngramsByDoc

  -- Saving the indexation in database
  _ <- mapM (saveDocNgramsWith lId) ngramsByDoc

  pure () -- ngramsByDoc

toIndexedNgrams :: HashMap Text NgramsId -> Text -> Maybe (Indexed Int Ngrams)
toIndexedNgrams m t = Indexed <$> i <*> n
  where
    i = HashMap.lookup t m
    n = Just (text2ngrams t)

------------------------------------------------------------------------
type PostAPI = Summary "Update List"
        :> "add"
        :> "form"
        :> "async"
        :> AsyncJobs JobLog '[FormUrlEncoded] WithFile JobLog

postAsync :: GargServer JSONAPI
postAsync lId =
  serveJobsAPI $
    JobFunction (\f log' ->
      let
        log'' x = do
          printDebug "postAsync ListId" x
          liftBase $ log' x
      in postAsync' lId f log'')

postAsync' :: FlowCmdM env err m
          => ListId
          -> WithFile
          -> (JobLog -> m ())
          -> m JobLog
postAsync' l (WithFile _ m _) logStatus = do

  logStatus JobLog { _scst_succeeded = Just 0
                   , _scst_failed    = Just 0
                   , _scst_remaining = Just 1
                   , _scst_events    = Just []
                   }
  printDebug "New list as file" l
  _ <- post l m
  -- printDebug "Done" r

  pure JobLog { _scst_succeeded = Just 1
              , _scst_failed    = Just 0
              , _scst_remaining = Just 0
              , _scst_events    = Just []
              }
------------------------------------------------------------------------
readCsvText :: Text -> [(Text, Text, Text)]
readCsvText t = case eDec of
  Left _ -> []
  Right dec -> Vec.toList dec
  where
    lt = BSL.fromStrict $ P.encodeUtf8 t
    eDec = Csv.decodeWith
             (Csv.defaultDecodeOptions { Csv.decDelimiter = fromIntegral (P.ord '\t') })
             Csv.HasHeader lt :: Either Prelude.String (Vector (Text, Text, Text))

parseCsvData :: [(Text, Text, Text)] -> Map NgramsTerm NgramsRepoElement
parseCsvData lst = Map.fromList $ conv <$> lst
  where
    conv (_status, label, _forms) =
        (NgramsTerm label, NgramsRepoElement { _nre_size = 1
                                             , _nre_list = CandidateTerm
                                             , _nre_root = Nothing
                                             , _nre_parent = Nothing
                                             , _nre_children = MSet Map.empty })

csvPost :: FlowCmdM env err m
        => ListId
        -> Text
        -> m Bool
csvPost l m  = do
  printDebug "[csvPost] l" l
  -- printDebug "[csvPost] m" m
  -- status label forms
  let lst = readCsvText m
  let p = parseCsvData lst
  --printDebug "[csvPost] lst" lst
  --printDebug "[csvPost] p" p
  _ <- setListNgrams l NgramsTerms p
  pure True
------------------------------------------------------------------------



csvPostAsync :: GargServer CSVAPI
csvPostAsync lId =
  serveJobsAPI $
    JobFunction $ \f@(WithTextFile ft _ n) log' -> do
      let log'' x = do
            printDebug "[csvPostAsync] filetype" ft
            printDebug "[csvPostAsync] name" n
            liftBase $ log' x
      csvPostAsync' lId f log''

csvPostAsync' :: FlowCmdM env err m
             => ListId
             -> WithTextFile
             -> (JobLog -> m ())
             -> m JobLog
csvPostAsync' l (WithTextFile _ m _) logStatus = do
  logStatus JobLog { _scst_succeeded = Just 0
                   , _scst_failed    = Just 0
                   , _scst_remaining = Just 1
                   , _scst_events    = Just []
                   }
  _r <- csvPost l m

  pure JobLog { _scst_succeeded = Just 1
              , _scst_failed    = Just 0
              , _scst_remaining = Just 0
              , _scst_events    = Just []
              }

------------------------------------------------------------------------