{-|
Module      : Gargantext.Database.Learn
Description : Learn Small Data Analytics with big data connection (DB)
opyright   : (c) CNRS, 2017-Present
License     : AGPL + CECILL v3
Maintainer  : team@gargantext.org
Stability   : experimental
Portability : POSIX

-}

{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE QuasiQuotes       #-}
{-# LANGUAGE RankNTypes        #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE FlexibleContexts  #-}
{-# LANGUAGE MonoLocalBinds    #-}

module Gargantext.Database.Action.Learn
  where

import Data.Maybe
import Data.Text (Text)
import Data.Tuple (snd)
import Gargantext.Core.Types (Offset, Limit)
import Gargantext.Database.Query.Facet
import Gargantext.Database.Admin.Types.Node
import Gargantext.Database.Admin.Utils (Cmd)
import Gargantext.Prelude
import Gargantext.Text.Learn
import qualified Data.List as List
import qualified Data.Text as Text

data FavOrTrash = IsFav | IsTrash
  deriving (Eq)


moreLike :: CorpusId   -> Maybe Offset -> Maybe Limit -> Maybe OrderBy
         -> FavOrTrash -> Cmd err [FacetDoc]
moreLike cId o l order ft = do
  priors <- getPriors ft cId
  moreLikeWith cId o l order ft priors

---------------------------------------------------------------------------
getPriors :: FavOrTrash -> CorpusId -> Cmd err (Events Bool)
getPriors ft cId = do

  docs_fav   <- filter (\(FacetDoc _ _ _ _ f _) -> f == Just 2)
              <$> runViewDocuments cId False Nothing Nothing Nothing

  docs_trash <- List.take (List.length docs_fav)
            <$> runViewDocuments cId True Nothing Nothing Nothing


  let priors = priorEventsWith text (fav2bool ft) (  List.zip (repeat False) docs_fav
                                      <> List.zip (repeat True ) docs_trash
                                      )
  pure priors


moreLikeWith :: CorpusId   -> Maybe Offset -> Maybe Limit -> Maybe OrderBy
             -> FavOrTrash -> Events Bool  -> Cmd err [FacetDoc]
moreLikeWith cId o l order ft priors = do

  docs_test  <- filter (\(FacetDoc _ _ _ _ f _) -> f == Just 1)
            <$> runViewDocuments cId False o Nothing order

  let results = map fst
       $ filter ((==) (Just $ not $ fav2bool ft) . snd)
       $ map (\f -> (f, detectDefaultWithPriors text priors f)) docs_test

  pure $ List.take (maybe 10 identity l) results

---------------------------------------------------------------------------
fav2bool :: FavOrTrash -> Bool
fav2bool ft = if (==) ft IsFav then True else False


text :: FacetDoc -> Text
text (FacetDoc _ _ _ h _ _)  = title <> "" <> Text.take 100 abstr
  where
    title = maybe "" identity (_hyperdataDocument_title    h)
    abstr = maybe "" identity (_hyperdataDocument_abstract h)

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

{-
apply :: (FlowCmdM env e m) => FavOrTrash -> CorpusId -> [NodeId] -> m [Int]
apply favTrash cId ns = case favTrash of
      IsFav   -> nodeNodesCategory $ map (\n -> (cId, n, 2)) ns
      IsTrash -> nodeNodesCategory $ map (\n -> (cId, n, 0)) ns

moreLikeAndApply :: FlowCmdM DevEnv GargError m => FavOrTrash -> CorpusId -> m [Int]
moreLikeAndApply ft cId = do
  priors <- getPriors ft cId
  moreLikeWithAndApply priors ft cId

moreLikeWithAndApply :: FlowCmdM DevEnv GargError m => Events Bool -> FavOrTrash -> CorpusId -> m [Int]
moreLikeWithAndApply priors ft cId = do
  ids <- map facetDoc_id <$> moreLikeWith cId ft priors
  apply ft cId ids
-}