{-
	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@]	Defines options common to native interface(s).
-}

module BishBosh.Input.NativeUIOptions(
-- * Types
-- ** Type-synonyms
	ScreenCoordinates,
-- ** Data-types
	NativeUIOptions(
--		MkNativeUIOptions,
		getBoardMagnification,
		getColourScheme
	),
-- * Constants
	tag,
	boardMagnificationTag,
--	nRowsTag,
--	nColumnsTag,
-- * Functions
-- ** Constructors
	mkNativeUIOptions
) where

import			Control.Arrow((***))
import qualified	BishBosh.Attribute.ColourScheme	as Attribute.ColourScheme
import qualified	BishBosh.Data.Exception		as Data.Exception
import qualified	BishBosh.Text.ShowList		as Text.ShowList
import qualified	Control.DeepSeq
import qualified	Control.Exception
import qualified	Data.Default
import qualified	Text.XML.HXT.Arrow.Pickle	as HXT

-- | Used to qualify XML.
tag :: String
tag			= "nativeUIOptions"

-- | Used to qualify XML.
boardMagnificationTag :: String
boardMagnificationTag	= "boardMagnification"

-- | Used to qualify XML.
nRowsTag :: String
nRowsTag		= "nRows"

-- | Used to qualify XML.
nColumnsTag :: String
nColumnsTag		= "nColumns"

-- | The coordinates used to index the screen.
type ScreenCoordinates row column	= (row, column)

-- | Constructor.
data NativeUIOptions row column	= MkNativeUIOptions {
	getBoardMagnification	:: ScreenCoordinates row column,	-- ^ The factor by which the dimensions of the board are stretched when displayed.
	getColourScheme		:: Attribute.ColourScheme.ColourScheme
} deriving Eq

instance (
	Control.DeepSeq.NFData	column,
	Control.DeepSeq.NFData	row
 ) => Control.DeepSeq.NFData (NativeUIOptions row column) where
	rnf MkNativeUIOptions {
		getBoardMagnification	= boardMagnification,
		getColourScheme		= colourScheme
	} = Control.DeepSeq.rnf (
		boardMagnification,
		colourScheme
	 )

instance (Show row, Show column) => Show (NativeUIOptions row column) where
	showsPrec _ MkNativeUIOptions {
		getBoardMagnification	= boardMagnification,
		getColourScheme		= colourScheme
	} = Text.ShowList.showsAssociationList' [
		(
			boardMagnificationTag,
			shows boardMagnification
		), (
			Attribute.ColourScheme.tag,
			shows colourScheme
		)
	 ]

instance (Num row, Num column) => Data.Default.Default (NativeUIOptions row column) where
	def = MkNativeUIOptions {
		getBoardMagnification	= (1, 1),
		getColourScheme		= Data.Default.def
	}

instance (
	HXT.XmlPickler	column,
	HXT.XmlPickler	row,
	Integral	column,
	Integral	row,
	Show		column,
	Show		row
 ) => HXT.XmlPickler (NativeUIOptions row column) where
	xpickle	= HXT.xpElem tag . HXT.xpWrap (
		uncurry mkNativeUIOptions,	-- Construct.
		\MkNativeUIOptions {
			getBoardMagnification	= boardMagnification,
			getColourScheme		= colourScheme
		} -> (
			boardMagnification,
			colourScheme
		)
	 ) $ HXT.xpPair (
		getBoardMagnification def `HXT.xpDefault` HXT.xpElem boardMagnificationTag (
			HXT.xpAttr nRowsTag HXT.xpickle `HXT.xpPair` HXT.xpAttr nColumnsTag HXT.xpickle
		)
	 ) (
		getColourScheme def `HXT.xpDefault` HXT.xpickle
	 ) where
		def	= Data.Default.def

-- | Smart constructor.
mkNativeUIOptions :: (
	Integral	column,
	Integral	row,
	Show		column,
	Show		row
 )
	=> ScreenCoordinates row column		-- ^ The factor by which the dimensions of the board are stretched when displayed.
	-> Attribute.ColourScheme.ColourScheme
	-> NativeUIOptions row column
mkNativeUIOptions boardMagnification colourScheme
	| uncurry (||) $ (
		(< 1) *** (< 1)
	) boardMagnification	= Control.Exception.throw . Data.Exception.mkOutOfBounds . showString "BishBosh.Input.NativeUIOptions.mkNativeUIOptions:\t" . showString boardMagnificationTag . Text.ShowList.showsAssociation $ shows boardMagnification " must both exceed zero."
	| uncurry (||) $ (
		even *** even
	) boardMagnification	= Control.Exception.throw . Data.Exception.mkInvalidDatum . showString "BishBosh.Input.NativeUIOptions.mkNativeUIOptions:\t" . showString boardMagnificationTag . Text.ShowList.showsAssociation $ shows boardMagnification " must both be odd."
	| otherwise		= MkNativeUIOptions {
		getBoardMagnification	= boardMagnification,
		getColourScheme		= colourScheme
	}