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

Count API part of Gargantext.
-}

{-# LANGUAGE TemplateHaskell    #-}
{-# LANGUAGE TypeOperators      #-}
{-# LANGUAGE DeriveAnyClass     #-}

module Gargantext.API.Count
      where

import Data.Aeson hiding (Error)
import Data.Aeson.TH (deriveJSON)
import Data.Either
import Data.List (permutations)
import Data.Swagger
import Data.Text (Text, pack)
import GHC.Generics (Generic)
import Gargantext.Core.Utils.Prefix (unPrefix, unPrefixSwagger)
import Gargantext.Prelude
import Servant
import Test.QuickCheck (elements)
import Test.QuickCheck.Arbitrary

-----------------------------------------------------------------------
-- TODO-ACCESS: CanCount
-- TODO-EVENTS: No events as this is a read only query.
type CountAPI = Post '[JSON] Counts

-----------------------------------------------------------------------
data Scraper = Pubmed | Hal | IsTex | Isidore
  deriving (Eq, Show, Generic, Enum, Bounded)

scrapers :: [Scraper]
scrapers = [minBound..maxBound]

instance FromJSON Scraper
instance ToJSON   Scraper

instance Arbitrary Scraper where
    arbitrary = elements scrapers

instance ToSchema Scraper

-----------------------------------------------------------------------
data QueryBool = QueryBool Text
        deriving (Eq, Show, Generic)

queries :: [QueryBool]
queries =  [QueryBool (pack "(X OR X') AND (Y OR Y') NOT (Z OR Z')")]
--queries =  [QueryBool (pack "(X + X') * (Y + Y') - (Z + Z')")]

instance Arbitrary QueryBool where
    arbitrary = elements queries

instance FromJSON QueryBool
instance ToJSON   QueryBool

instance ToSchema QueryBool
-----------------------------------------------------------------------

data Query = Query { query_query :: QueryBool
                   , query_name  :: Maybe [Scraper]
                   }
                   deriving (Eq, Show, Generic)
instance FromJSON Query
instance ToJSON   Query

instance Arbitrary Query where
    arbitrary = elements [ Query q (Just n) 
                         | q <- queries
                         , n <- take 10 $ permutations scrapers
                         ]

instance ToSchema Query where
  declareNamedSchema = genericDeclareNamedSchema (unPrefixSwagger "query_")

-----------------------------------------------------------------------
type Code = Integer
type Error  = Text
type Errors = [Error]

-----------------------------------------------------------------------
data Message = Message Code Errors
        deriving (Eq, Show, Generic)

toMessage :: [(Code, Errors)] -> [Message]
toMessage = map (\(c,err) -> Message c err)

messages :: [Message]
messages =  toMessage $ [ (400, ["Ill formed query             "])
                        , (300, ["API connexion error          "])
                        , (300, ["Internal Gargantext Error    "])
                        ] <> take 10 ( repeat (200, [""]))

instance Arbitrary Message where
    arbitrary = elements messages

instance FromJSON Message
instance ToJSON   Message

instance ToSchema Message
-----------------------------------------------------------------------
data Counts = Counts { results :: [Either Message Count]
                     } deriving (Eq, Show, Generic)


instance FromJSON Counts
instance ToJSON   Counts

instance Arbitrary Counts where
    arbitrary = elements [Counts [ Right (Count Pubmed (Just 20 ))
                                 , Right (Count IsTex  (Just 150))
                                 , Right (Count Hal    (Just 150))
                                 ]
                         ]

instance ToSchema Counts

-----------------------------------------------------------------------
data Count = Count { count_name    :: Scraper
                   , count_count   :: Maybe Int
                   }
                   deriving (Eq, Show, Generic)

$(deriveJSON (unPrefix "count_") ''Count)

instance ToSchema Count where
  declareNamedSchema = genericDeclareNamedSchema (unPrefixSwagger "count_")
--instance Arbitrary Count where
--    arbitrary = Count <$> arbitrary <*> arbitrary <*> arbitrary

-----------------------------------------------------------------------
count :: Monad m => Query -> m Counts
count _ = undefined
