------------------------------------------------------------------------
-- |
-- Module      :  ALife.Creatur.Genetics.BRGCWord8QC
-- Copyright   :  (c) Amy de Buitléir 2013
-- License     :  BSD-style
-- Maintainer  :  amy@nualeargais.ie
-- Stability   :  experimental
-- Portability :  portable
--
-- QuickCheck tests.
--
------------------------------------------------------------------------
{-# LANGUAGE DeriveGeneric, FlexibleInstances #-}
module ALife.Creatur.Genetics.BRGCWord8QC
  (
    test
  ) where

import Prelude hiding (read)
import ALife.Creatur.Genetics.BRGCWord8
import ALife.Creatur.Genetics.Analysis (Analysable)
import Control.Applicative ((<$>), (<*>))
import Data.Word (Word8, Word16)
import GHC.Generics (Generic)
import Test.Framework as TF (Test, testGroup)
import Test.Framework.Providers.QuickCheck2 (testProperty)
import Test.QuickCheck (Arbitrary, Gen, Property, arbitrary, choose,
  oneof, property, sized, vectorOf)

prop_round_trippable :: (Eq g, Genetic g) => g -> Property
prop_round_trippable g = property $ g' == Right g
  where x = write g
        g' = read x

data TestStructure = A | B Bool | C Word8 | D Word16 Char | E [TestStructure]
  deriving (Show, Eq, Generic)

instance Genetic TestStructure
instance Analysable TestStructure

sizedArbTestStructure :: Int -> Gen TestStructure
sizedArbTestStructure 0 =
  oneof [ return A, B <$> arbitrary, C <$> arbitrary,
          D <$> arbitrary <*> arbitrary]
sizedArbTestStructure n = do
  k <- choose (0,min 8 (n-1))
  oneof [
          return A,
          B <$> arbitrary,
          C <$> arbitrary,
          D <$> arbitrary <*> arbitrary,
          E <$> vectorOf k (sizedArbTestStructure (n-1))
        ]
  
instance Arbitrary TestStructure where
  arbitrary = sized sizedArbTestStructure

test :: Test
test = testGroup "ALife.Creatur.Genetics.BRGCWord8QC"
  [
    testProperty "prop_round_trippable - Bool"
      (prop_round_trippable :: Bool -> Property),
    testProperty "prop_round_trippable - Char"
      (prop_round_trippable :: Char -> Property),
    testProperty "prop_round_trippable - Word8"
      (prop_round_trippable :: Word8 -> Property),
    testProperty "prop_round_trippable - Word16"
      (prop_round_trippable :: Word16 -> Property),
    testProperty "prop_round_trippable - TestStructure"
      (prop_round_trippable :: TestStructure -> Property)
  ]