{-# OPTIONS_GHC -fno-warn-orphans #-}
{-
	Copyright (C) 2018 Dr. Alistair Ward

	This file is part of BishBosh.

	BishBosh is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	BishBosh is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with BishBosh.  If not, see <http://www.gnu.org/licenses/>.
-}
{- |
 [@AUTHOR@]	Dr. Alistair Ward

 [@DESCRIPTION@]	Implements 'Test.QuickCheck.Arbitrary' & defines /QuickCheck/-properties.
-}

module BishBosh.Test.QuickCheck.Component.Piece(
-- * Constants
	results
) where

import			Control.Arrow((&&&))
import qualified	BishBosh.Attribute.Rank				as Attribute.Rank
import qualified	BishBosh.Cartesian.Coordinates			as Cartesian.Coordinates
import qualified	BishBosh.Component.Piece			as Component.Piece
import qualified	BishBosh.Property.FixedMembership		as Property.FixedMembership
import qualified	BishBosh.Property.ForsythEdwards		as Property.ForsythEdwards
import qualified	BishBosh.Property.Opposable			as Property.Opposable
import qualified	BishBosh.Test.QuickCheck.Cartesian.Coordinates	as Test.QuickCheck.Cartesian.Coordinates
import qualified	Test.QuickCheck
import qualified	ToolShed.Test.ReversibleIO
import			Test.QuickCheck((==>))

instance Test.QuickCheck.Arbitrary Component.Piece.Piece where
	arbitrary	= Test.QuickCheck.elements Property.FixedMembership.members

-- | The constant test-results for this data-type.
results :: IO [Test.QuickCheck.Result]
results	= sequence [
	let
		f :: Component.Piece.Piece -> Test.QuickCheck.Property
		f	= Test.QuickCheck.label "Piece.prop_getOpposite" . uncurry (==) . (Property.Opposable.getOpposite . Property.Opposable.getOpposite &&& id)
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 16 } f,
	let
		f :: Component.Piece.Piece -> Test.QuickCheck.Property
		f	= Test.QuickCheck.label "Piece.prop_readPrependedWhiteSpace" . ToolShed.Test.ReversibleIO.readPrependedWhiteSpace
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 256 } f,
	let
		f :: String -> Test.QuickCheck.Property
		f garbage	= Test.QuickCheck.label "Piece.prop_read" $ case (reads garbage :: [(Component.Piece.Piece, String)]) of
			[_]	-> True
			_	-> True	-- Unless the read-implementation throws an exception.
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 256 } f,
	let
		f :: Component.Piece.Piece -> String -> Test.QuickCheck.Property
		f piece	= Test.QuickCheck.label "Piece.prop_readTrailingGarbage" . ToolShed.Test.ReversibleIO.readTrailingGarbage (const False) piece
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 256 } f,
	let
		f :: Component.Piece.Piece -> Test.QuickCheck.Property
		f piece	= Test.QuickCheck.label "Piece.prop_fen" $ case Property.ForsythEdwards.readsFEN $ Property.ForsythEdwards.showFEN piece of
			[(piece', "")]	-> piece' == piece
			_		-> False
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 32 } f,
	let
		f :: Test.QuickCheck.Cartesian.Coordinates.Coordinates -> Component.Piece.Piece -> Test.QuickCheck.Property
		f coordinates piece	= Component.Piece.getRank piece `elem` Attribute.Rank.fixedAttackRange ==> Test.QuickCheck.label "Piece.prop_findAttackDestinationsInt" $ Component.Piece.findAttackDestinations coordinates piece == map Test.QuickCheck.Cartesian.Coordinates.translate (
			Component.Piece.findAttackDestinations (
				Test.QuickCheck.Cartesian.Coordinates.translate coordinates	:: Cartesian.Coordinates.Coordinates Integer Integer	-- Force use of unspecialised instance.
			) piece
		 )
	in Test.QuickCheck.quickCheckWithResult Test.QuickCheck.stdArgs { Test.QuickCheck.maxSuccess = 64 } f
 ]