{-|
Module      : Gargantext.Core.Text.Terms.Multi
Description : Multi Terms module
Copyright   : (c) CNRS, 2017 - present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX

Multi-terms are ngrams where n > 1.

-}


module Gargantext.Core.Text.Terms.Multi (multiterms, multiterms_rake, tokenTagsWith)
  where

import Data.Text hiding (map, group, filter, concat)
import Data.List (concat)

import Gargantext.Prelude
import Gargantext.Core (Lang(..))
import Gargantext.Core.Types

import Gargantext.Core.Text.Terms.Multi.PosTagging
import Gargantext.Core.Text.Terms.Multi.PosTagging.Types
import qualified Gargantext.Core.Text.Terms.Multi.Lang.En as En
import qualified Gargantext.Core.Text.Terms.Multi.Lang.Fr as Fr

import Gargantext.Core.Text.Terms.Multi.RAKE (multiterms_rake)
import qualified Gargantext.Utils.JohnSnowNLP as JohnSnow


-------------------------------------------------------------------
type NLP_API = Lang -> Text -> IO PosSentences

-------------------------------------------------------------------
-- To be removed
multiterms :: Lang -> Text -> IO [Terms]
multiterms = multiterms' tokenTag2terms
 
multiterms' :: (TokenTag -> a) -> Lang -> Text -> IO [a]
multiterms' f lang txt = concat
                   <$> map (map f)
                   <$> map (filter (\t -> _my_token_pos t == Just NP))
                   <$> tokenTags lang txt

-------------------------------------------------------------------
tokenTag2terms :: TokenTag -> Terms
tokenTag2terms (TokenTag ws t _ _) =  Terms ws t

tokenTags :: Lang -> Text -> IO [[TokenTag]]
tokenTags EN txt = tokenTagsWith EN txt corenlp
tokenTags FR txt = tokenTagsWith FR txt JohnSnow.nlp
tokenTags _  _   = panic "[G.C.T.T.Multi] NLP API not implemented yet"

tokenTagsWith :: Lang -> Text -> NLP_API -> IO [[TokenTag]]
tokenTagsWith lang txt nlp = map (groupTokens lang)
                          <$> map tokens2tokensTags
                          <$> map _sentenceTokens
                          <$> _sentences
                          <$> nlp lang txt


---- | This function analyses and groups (or not) ngrams according to
----   specific grammars of each language.
groupTokens :: Lang -> [TokenTag] -> [TokenTag]
groupTokens EN = En.groupTokens
groupTokens FR = Fr.groupTokens
groupTokens _  = panic $ pack "groupTokens :: Lang not implemeted yet"