{-# OPTIONS_GHC -fno-warn-incomplete-patterns #-}
{-# LANGUAGE ScopedTypeVariables #-}

module HaskellWorks.Data.RankSelect.Base.Select1Spec
  ( genSelect1UpTo8Spec
  , genSelect1UpTo16Spec
  , genSelect1UpTo32Spec
  , spec
  ) where

import           Data.Maybe
import           Data.Typeable
import qualified Data.Vector                                                as DV
import qualified Data.Vector.Storable                                       as DVS
import           Data.Word
import           HaskellWorks.Data.Bits.BitRead
import           HaskellWorks.Data.Bits.BitWise
import           HaskellWorks.Data.Bits.PopCount.PopCount1
import           HaskellWorks.Data.Positioning
import           HaskellWorks.Data.RankSelect.Base.Rank1
import           HaskellWorks.Data.RankSelect.Base.Select1
import           Test.Hspec
import           Test.QuickCheck

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

genSelect1UpTo8Spec :: forall s. (Typeable s, BitRead s, Select1 s) => s -> Spec
genSelect1UpTo8Spec _ = describe ("Generically up to 8 bits for " ++ show (typeOf (undefined :: s))) $ do
  it "select1 10010010 over [0..3] should be 0147" $ do
    let bs = fromJust $ bitRead "10010010" :: s
    fmap (select1 bs) [0..3] `shouldBe` [0, 1, 4, 7]

genSelect1UpTo16Spec :: forall s. (Typeable s, BitRead s, Select1 s) => s -> Spec
genSelect1UpTo16Spec _ = describe ("Generically up to 16 bits for " ++ show (typeOf (undefined :: s))) $ do
  it "select1 11011010 00 over [0..5]" $
    let bs = fromJust $ bitRead "11011010 00" :: s in
    fmap (select1 bs) [0..5] `shouldBe` [0, 1, 2, 4, 5, 7]
  it "select1 11011010 00000000 over [0..5]" $ do
    let bs = fromJust $ bitRead "11011010 00000000" :: s
    fmap (select1 bs) [0..5] `shouldBe` [0, 1, 2, 4, 5, 7]
  it "select 01000000 00000100 over [0..2]" $ do
    let bs = fromJust $ bitRead "01000000 00000100" :: s
    fmap (select1 bs) [0..2] `shouldBe` [0, 2, 14]

genSelect1UpTo32Spec :: forall s. (Typeable s, BitRead s, Select1 s) => s -> Spec
genSelect1UpTo32Spec _ = describe ("Generically up to 16 bits for " ++ show (typeOf (undefined :: s))) $ do
  it "select1 11000001 10000000 01000000 over [0..5] should be 023568" $
    let bs = fromJust $ bitRead "11000001 10000000 01000000" :: s in
    fmap (select1 bs) [0..5] `shouldBe` [0, 1, 2, 8, 9, 18]
  it "select 10000010 00000000 00100000 00010000 over [0..4]" $ do
    let bs = fromJust $ bitRead "10000010 00000000 00100000 00010000" :: s
    fmap (select1 bs) [0..4] `shouldBe` [0, 1, 7, 19, 28]

spec :: Spec
spec = describe "HaskellWorks.Data.RankSelect.InternalSpec" $ do
  genSelect1UpTo8Spec  (undefined :: Word8)
  genSelect1UpTo8Spec  (undefined :: Word16)
  genSelect1UpTo8Spec  (undefined :: Word32)
  genSelect1UpTo8Spec  (undefined :: Word64)
  genSelect1UpTo16Spec (undefined :: Word16)
  genSelect1UpTo16Spec (undefined :: Word32)
  genSelect1UpTo16Spec (undefined :: Word64)
  genSelect1UpTo32Spec (undefined :: Word32)
  genSelect1UpTo32Spec (undefined :: Word64)
  genSelect1UpTo8Spec  (undefined :: [Bool])
  genSelect1UpTo16Spec (undefined :: [Bool])
  genSelect1UpTo32Spec (undefined :: [Bool])
  genSelect1UpTo8Spec  (undefined :: [Word8])
  genSelect1UpTo16Spec (undefined :: [Word8])
  genSelect1UpTo32Spec (undefined :: [Word8])
  genSelect1UpTo8Spec  (undefined :: [Word16])
  genSelect1UpTo16Spec (undefined :: [Word16])
  genSelect1UpTo32Spec (undefined :: [Word16])
  genSelect1UpTo8Spec  (undefined :: [Word32])
  genSelect1UpTo16Spec (undefined :: [Word32])
  genSelect1UpTo32Spec (undefined :: [Word32])
  genSelect1UpTo8Spec  (undefined :: [Word64])
  genSelect1UpTo16Spec (undefined :: [Word64])
  genSelect1UpTo32Spec (undefined :: [Word64])
  genSelect1UpTo8Spec  (undefined :: DV.Vector Word8)
  genSelect1UpTo16Spec (undefined :: DV.Vector Word8)
  genSelect1UpTo32Spec (undefined :: DV.Vector Word8)
  genSelect1UpTo8Spec  (undefined :: DV.Vector Word16)
  genSelect1UpTo16Spec (undefined :: DV.Vector Word16)
  genSelect1UpTo32Spec (undefined :: DV.Vector Word16)
  genSelect1UpTo8Spec  (undefined :: DV.Vector Word32)
  genSelect1UpTo16Spec (undefined :: DV.Vector Word32)
  genSelect1UpTo32Spec (undefined :: DV.Vector Word32)
  genSelect1UpTo8Spec  (undefined :: DV.Vector Word64)
  genSelect1UpTo16Spec (undefined :: DV.Vector Word64)
  genSelect1UpTo32Spec (undefined :: DV.Vector Word64)
  genSelect1UpTo8Spec  (undefined :: DVS.Vector Word8)
  genSelect1UpTo16Spec (undefined :: DVS.Vector Word8)
  genSelect1UpTo32Spec (undefined :: DVS.Vector Word8)
  genSelect1UpTo8Spec  (undefined :: DVS.Vector Word16)
  genSelect1UpTo16Spec (undefined :: DVS.Vector Word16)
  genSelect1UpTo32Spec (undefined :: DVS.Vector Word16)
  genSelect1UpTo8Spec  (undefined :: DVS.Vector Word32)
  genSelect1UpTo16Spec (undefined :: DVS.Vector Word32)
  genSelect1UpTo32Spec (undefined :: DVS.Vector Word32)
  genSelect1UpTo8Spec  (undefined :: DVS.Vector Word64)
  genSelect1UpTo16Spec (undefined :: DVS.Vector Word64)
  genSelect1UpTo32Spec (undefined :: DVS.Vector Word64)
  describe "For Word64" $ do
    it "rank1 for Word16 and Word64 should give same answer for bits 0-7" $ property $
      forAll (choose (0, 8)) $ \(i :: Count) (w :: Word8) ->
        rank1 w i == rank1 (fromIntegral w :: Word64) i
    it "rank1 for Word16 and Word64 should give same answer for bits 0-15" $ property $
      forAll (choose (0, 16)) $ \(i :: Count) (w :: Word16) ->
        rank1 w i == rank1 (fromIntegral w :: Word64) i
    it "rank1 for Word32 and Word64 should give same answer for bits 0-31" $ property $
      forAll (choose (0, 32)) $ \(i :: Count) (w :: Word32) ->
        rank1 w i == rank1 (fromIntegral w :: Word64) i
    it "rank1 for Word32 and Word64 should give same answer for bits 32-64" $ property $
      forAll (choose (0, 32)) $ \(i :: Count) (v :: Word32) (w :: Word32) ->
        let v64 = fromIntegral v :: Word64 in
        let w64 = fromIntegral w :: Word64 in
        rank1 v i + popCount1 w == rank1 ((v64 .<. 32) .|. w64) (i + 32)
    it "rank1 and select1 for Word64 form a galois connection" $ property $
      forAll (choose (0, 32)) $ \(i :: Count) (w :: Word32) -> 1 <= i && i <= popCount1 w ==>
        rank1 w (select1 w i) == i && select1 w (rank1 w (fromIntegral i)) <= fromIntegral i