{- |
  Module : PropTests.BoundingBoxTests.BoundingBoxTests
  Copyright  : Copyright (c) 2016 Michael Litchard
  License    : BSD3

  Maintainer : Michael Litchard
  Stability  : experimental
  Portability: not portable
  
  This module provides property tests for Data.Octree.BoundingBox.BoundingBox

-}

module PropTests.BoundingBoxTests.BoundingBoxTests
  ( propValidateBoxes
  , propMatchValuesToBoxes
  ) where



import Test.Hspec (Spec, describe)
import Test.Hspec.QuickCheck (prop)

import Data.Octree.Internal (Vector3 (..), fromList)
import Data.Octree.BoundingBox.BoundingBox (BBoxConfig, traverseOctreeBB)

import PropTests.Common
import PropTests.BoundingBoxTests.Utilities
import Data.Octree.BoundingBox.Internal (DefInput, DefOutput, DefNodeValue)

propValidateBoxes :: Spec
propValidateBoxes = 
  describe "prop_validateBoxes" $
    prop propMsg prop_validateBoxes               
  where
    propMsg =
      "Testing that arbitarily generated bounding boxes are well-formed."

propMatchValuesToBoxes :: Spec
propMatchValuesToBoxes =
  describe "prop_matchValuesToBox"                $
    prop propMsg                                  $
    prop_matchValuesToBox testConfig1 testConfig2
  where
    propMsg = 
      "Testing that each generated BBox3 maps to correct [(Vector3, Int)]"
    
  
-- | validateBoxes takes the list of all bounding boxes of an Octree
--   and determines if they are all well-formed
prop_validateBoxes :: [(Vector3, Int)] -> Bool
prop_validateBoxes l = 
  let octree' = fromList l
      bbxs    = map fst $ traverseOctreeBB testConfig1 bbis octree' (Vector3 0 0 0)
  in all isBBox bbxs

type TestConfigOne = BBoxConfig DefInput [DefOutput] DefNodeValue
type TestConfigTwo = BBoxConfig AltInput DefOutput DefNodeValue
-- | matchValuesToBox verifies that each BBox3 generated by 
--   TestConfigOne maps to the correct key list
prop_matchValuesToBox :: TestConfigOne       -> 
                         TestConfigTwo       -> 
                         [(Vector3, Int)]    -> 
                         Bool
prop_matchValuesToBox config1 config2 l =
  let octree'  = fromList l
      boxCol1  = traverseOctreeBB config1 bbis octree' x
      x        = Vector3 0 0 0 -- this is never used but needs to be present
      xs'      = map fst boxCol1
      boxCol2  = map (traverseOctreeBB config2 bbis octree') xs'
      validate = map (`elem` boxCol1) boxCol2
  in and validate