{-|
Module      : Gargantext.Database.Metrics
Description : Get Metrics from Storage (Database like)
Copyright   : (c) CNRS, 2017-Present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX

Node API
-}

module Gargantext.Database.Action.Metrics
  where

import Data.HashMap.Strict (HashMap)
import Data.Map (Map)
import Data.Text (Text)
import Data.Vector (Vector)
import Gargantext.API.Ngrams.Tools (filterListWithRoot, groupNodesByNgrams, Diagonal(..), getCoocByNgrams, mapTermListRoot, RootTerm, getRepo)
import Gargantext.API.Ngrams.Types (TabType(..), ngramsTypeFromTabType, NgramsTerm)
import Gargantext.Core.Text.Metrics (scored, Scored(..), {-localMetrics, toScored-})
import Gargantext.Core.Types (ListType(..), Limit, NodeType(..))
import Gargantext.Database.Action.Flow.Types (FlowCmdM)
import Gargantext.Database.Action.Metrics.NgramsByNode (getNodesByNgramsOnlyUser{-, getTficfWith-})
import Gargantext.Database.Admin.Config (userMaster)
import Gargantext.Database.Admin.Types.Node (ListId, CorpusId)
import Gargantext.Database.Query.Table.Node (defaultList)
import Gargantext.Database.Query.Table.Node.Select
import Gargantext.Prelude
import qualified Data.HashMap.Strict as HM
import qualified Data.Map            as Map

getMetrics :: FlowCmdM env err m
            => CorpusId -> Maybe ListId -> TabType -> Maybe Limit
            -> m (HashMap NgramsTerm (ListType, Maybe NgramsTerm), Vector (Scored NgramsTerm))
getMetrics cId maybeListId tabType maybeLimit = do
  (ngs, _, myCooc) <- getNgramsCooc cId maybeListId tabType maybeLimit
  -- TODO HashMap
  pure (ngs, scored myCooc)


getNgramsCooc :: (FlowCmdM env err m)
            => CorpusId -> Maybe ListId -> TabType -> Maybe Limit
            -> m ( HashMap NgramsTerm (ListType, Maybe NgramsTerm)
                 , HashMap NgramsTerm (Maybe RootTerm)
                 , HashMap (NgramsTerm, NgramsTerm) Int
                 )
getNgramsCooc cId maybeListId tabType maybeLimit = do
  (ngs', ngs) <- getNgrams cId maybeListId tabType

  let
    take' Nothing  xs = xs
    take' (Just n) xs = take n xs

  lId  <- defaultList cId
  lIds <- selectNodesWithUsername NodeList userMaster

  myCooc <- HM.filter (>1) <$> getCoocByNgrams (Diagonal True)
                           <$> groupNodesByNgrams ngs
                           <$> getNodesByNgramsOnlyUser cId (lIds <> [lId]) (ngramsTypeFromTabType tabType)
                                                            (take' maybeLimit $ HM.keys ngs)
  pure $ (ngs', ngs, myCooc)



getNgrams :: (FlowCmdM env err m)
            => CorpusId -> Maybe ListId -> TabType
            -> m ( HashMap NgramsTerm (ListType, Maybe NgramsTerm)
                 , HashMap NgramsTerm (Maybe RootTerm)
                 )
getNgrams cId maybeListId tabType = do

  lId <- case maybeListId of
    Nothing   -> defaultList cId
    Just lId' -> pure lId'

  lists <- mapTermListRoot [lId] (ngramsTypeFromTabType tabType) <$> getRepo
  let maybeSyn = HM.unions $ map (\t -> filterListWithRoot t lists)
                             [MapTerm, StopTerm, CandidateTerm]
  pure (lists, maybeSyn)