{-# LANGUAGE ExplicitForAll            #-}
{-# LANGUAGE FlexibleContexts          #-}
{-# LANGUAGE FlexibleInstances         #-}
{-# LANGUAGE InstanceSigs              #-}
{-# LANGUAGE MultiParamTypeClasses     #-}
{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE OverloadedStrings         #-}
{-# LANGUAGE ScopedTypeVariables       #-}

{-# OPTIONS_GHC -fno-warn-missing-signatures #-}

module HaskellWorks.Data.Json.ValueSpec (spec) where

import Control.Monad
import Data.String
import Data.Word
import HaskellWorks.Data.BalancedParens.BalancedParens
import HaskellWorks.Data.BalancedParens.Simple
import HaskellWorks.Data.Bits.BitWise
import HaskellWorks.Data.FromForeignRegion
import HaskellWorks.Data.Json.Cursor
import HaskellWorks.Data.Json.DecodeError
import HaskellWorks.Data.Json.Internal.Index
import HaskellWorks.Data.Json.Value
import HaskellWorks.Data.RankSelect.Base.Rank0
import HaskellWorks.Data.RankSelect.Base.Rank1
import HaskellWorks.Data.RankSelect.Base.Select1
import HaskellWorks.Data.RankSelect.Poppy512
import Test.Hspec

import qualified Data.ByteString              as BS
import qualified Data.Vector.Storable         as DVS
import qualified HaskellWorks.Data.TreeCursor as TC

{-# ANN module ("HLint: ignore Redundant do"        :: String) #-}
{-# ANN module ("HLint: ignore Reduce duplication"  :: String) #-}
{-# ANN module ("HLint: redundant bracket"          :: String) #-}

fc = TC.firstChild
ns = TC.nextSibling

spec :: Spec
spec = describe "HaskellWorks.Data.Json.ValueSpec" $ do
  genSpec "DVS.Vector Word64" (undefined :: JsonCursor BS.ByteString (DVS.Vector Word64) (SimpleBalancedParens (DVS.Vector Word64)))
  genSpec "Poppy512"          (undefined :: JsonCursor BS.ByteString Poppy512 (SimpleBalancedParens (DVS.Vector Word64)))

jsonValueVia  ::
  ( BalancedParens u
  , Rank0 u
  , Rank1 u
  , Select1 t
  , TestBit u)
  => Maybe (JsonCursor BS.ByteString t u) -> Either DecodeError JsonValue
jsonValueVia mk = case mk of
  Just k  -> (jsonIndexAt >=> jsonValueAt) k
  Nothing -> Left (DecodeError "No such element")

genSpec :: forall t u.
  ( Eq                t
  , Show              t
  , Select1           t
  , Eq                u
  , Show              u
  , Rank0             u
  , Rank1             u
  , BalancedParens    u
  , TestBit           u
  , FromForeignRegion (JsonCursor BS.ByteString t u)
  , IsString          (JsonCursor BS.ByteString t u))
  => String -> (JsonCursor BS.ByteString t u) -> SpecWith ()
genSpec t _ = do
  describe ("Json cursor of type " ++ t) $ do
    let forJson (cursor :: JsonCursor BS.ByteString t u) f = describe ("of value " ++ show cursor) (f cursor)
    forJson "{}" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonObject [])
    forJson " {}" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonObject [])
    forJson "1234" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonNumber 1234)
    forJson "\"Hello\"" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonString "Hello")
    forJson "[]" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonArray [])
    forJson "true" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonBool True)
    forJson "false" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonBool False)
    forJson "null" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right JsonNull
    forJson "[null]" $ \cursor -> do
      it "should have correct value"      $ jsonValueVia (Just cursor) `shouldBe` Right (JsonArray [JsonNull])
      it "should have correct value"      $ jsonValueVia (fc   cursor) `shouldBe` Right  JsonNull
    forJson "[null, {\"field\": 1}]" $ \cursor -> do
      it "cursor can navigate to second child of array" $ do
        jsonValueVia ((fc >=> ns)   cursor) `shouldBe` Right (                     JsonObject [("field", JsonNumber 1)] )
        jsonValueVia (Just          cursor) `shouldBe` Right (JsonArray [JsonNull, JsonObject [("field", JsonNumber 1)]])
    describe "For empty json array" $ do
      let cursor =  "[]" :: JsonCursor BS.ByteString t u
      it "can navigate down and forwards" $ do
        jsonValueVia (Just cursor) `shouldBe` Right (JsonArray [])
    describe "For empty json array" $ do
      let cursor =  "[null]" :: JsonCursor BS.ByteString t u
      it "can navigate down and forwards" $ do
        jsonValueVia (Just cursor) `shouldBe` Right (JsonArray [JsonNull])
    describe "For sample Json" $ do
      let cursor =  "{ \
                    \    \"widget\": { \
                    \        \"debug\": \"on\", \
                    \        \"window\": { \
                    \            \"name\": \"main_window\", \
                    \            \"dimensions\": [500, 600.01e-02, true, false, null] \
                    \        } \
                    \    } \
                    \}" :: JsonCursor BS.ByteString t u
      it "can navigate down and forwards" $ do
        let array   = JsonArray [JsonNumber 500, JsonNumber 600.01e-02, JsonBool True, JsonBool False, JsonNull] :: JsonValue
        let object1 = JsonObject ([("name", JsonString "main_window"), ("dimensions", array)]) :: JsonValue
        let object2 = JsonObject ([("debug", JsonString "on"), ("window", object1)]) :: JsonValue
        let object3 = JsonObject ([("widget", object2)]) :: JsonValue
        jsonValueVia (Just                                                                                                   cursor) `shouldBe` Right object3
        jsonValueVia ((fc                                                                                                  ) cursor) `shouldBe` Right (JsonString "widget"      )
        jsonValueVia ((fc >=> ns                                                                                           ) cursor) `shouldBe` Right (object2                  )
        jsonValueVia ((fc >=> ns >=> fc                                                                                    ) cursor) `shouldBe` Right (JsonString "debug"       )
        jsonValueVia ((fc >=> ns >=> fc >=> ns                                                                             ) cursor) `shouldBe` Right (JsonString "on"          )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns                                                                      ) cursor) `shouldBe` Right (JsonString "window"      )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns                                                               ) cursor) `shouldBe` Right (object1                  )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc                                                        ) cursor) `shouldBe` Right (JsonString "name"        )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns                                                 ) cursor) `shouldBe` Right (JsonString "main_window" )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns                                          ) cursor) `shouldBe` Right (JsonString "dimensions"  )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns                                   ) cursor) `shouldBe` Right (array                    )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc                            ) cursor) `shouldBe` Right (JsonNumber 500           )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns                     ) cursor) `shouldBe` Right (JsonNumber 600.01e-02    )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns              ) cursor) `shouldBe` Right (JsonBool True            )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns       ) cursor) `shouldBe` Right (JsonBool False           )
        jsonValueVia ((fc >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> fc >=> ns >=> ns >=> ns >=> ns) cursor) `shouldBe` Right JsonNull