{-
	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 configurable options related to I/O.
-}

module BishBosh.Input.IOOptions(
-- * Types
-- ** Type-synonyms
--	Transformation,
	MaximumPGNNames,
-- ** Data-types
	IOOptions(
--		MkIOOptions,
		getMaybeOutputConfigFilePath,
		getMaybeMaximumPGNNames,
		getPGNOptionsList,
		getMaybePersistence,
		getUIOptions
	),
-- * Constants
	tag,
	outputConfigFilePathTag,
--	maximumPGNNamesTag,
--	persistenceTag,
--	filePathTag,
--	automaticTag,
-- * Functions
-- ** Constructor
	mkIOOptions,
-- ** Mutators
	setMaybeOutputConfigFilePath,
	setEitherNativeUIOrCECPOptions,
	setMaybePrintMoveTree,
	updateCECPFeature,
	deleteCECPFeature,
	setVerbosity
) where

import qualified	BishBosh.Data.Exception		as Data.Exception
import qualified	BishBosh.Input.CECPFeatures	as Input.CECPFeatures
import qualified	BishBosh.Input.PGNOptions	as Input.PGNOptions
import qualified	BishBosh.Input.UIOptions	as Input.UIOptions
import qualified	BishBosh.Property.Tree		as Property.Tree
import qualified	BishBosh.Text.ShowList		as Text.ShowList
import qualified	Control.Arrow
import qualified	Control.DeepSeq
import qualified	Control.Exception
import qualified	Data.Default
import qualified	Data.Maybe
import qualified	Distribution.Verbosity
import qualified	System.FilePath
import qualified	Text.XML.HXT.Arrow.Pickle	as HXT
import qualified	ToolShed.Data.Foldable

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

-- | Used to qualify XML.
maximumPGNNamesTag :: String
maximumPGNNamesTag	= "maximumPGNNames"

-- | Used to qualify XML.
outputConfigFilePathTag :: String
outputConfigFilePathTag	= "outputConfigFilePath"

-- | Used to qualify XML.
persistenceTag :: String
persistenceTag		= "persistence"

-- | Used to qualify XML.
filePathTag :: String
filePathTag		= "filePath"

-- | Used to qualify XML.
automaticTag :: String
automaticTag		= "automatic"

-- | The maximum number names, of matching games from the PGN-database, to display.
type MaximumPGNNames	= Int

-- | Defines options related to i/o.
data IOOptions row column	= MkIOOptions {
	getMaybeOutputConfigFilePath	:: Maybe System.FilePath.FilePath,		-- ^ An optional path to a file, into which the unprocessed configuration, formatted as XML, should be written (obliterating any existing file-contents).
	getMaybeMaximumPGNNames		:: Maybe MaximumPGNNames,			-- ^ The maximum number names, of matching games from the PGN-database, to display; @Nothing@ implies no maximum.
	getPGNOptionsList		:: [Input.PGNOptions.PGNOptions],		-- ^ How to construct PGN-databases.
	getMaybePersistence		:: Maybe (System.FilePath.FilePath, Bool),	-- ^ Optional path to a file, into which game-state can be persisted (obliterating any existing content), & whether to save this state automatically after each move.
	getUIOptions			:: Input.UIOptions.UIOptions row column		-- ^ Options which define the user-interface.
} deriving Eq

instance (
	Control.DeepSeq.NFData	column,
	Control.DeepSeq.NFData	row
 ) => Control.DeepSeq.NFData (IOOptions row column) where
	rnf MkIOOptions {
		getMaybeOutputConfigFilePath	= maybeOutputConfigFilePath,
		getMaybeMaximumPGNNames		= maybeMaximumPGNNames,
		getPGNOptionsList		= pgnOptionsList,
		getMaybePersistence		= maybePersistence,
		getUIOptions			= uiOptions
	} = Control.DeepSeq.rnf (
		maybeOutputConfigFilePath,
		maybeMaximumPGNNames,
		pgnOptionsList,
		maybePersistence,
		uiOptions
	 )

instance (Show column, Show row) => Show (IOOptions row column) where
	showsPrec _ MkIOOptions {
		getMaybeOutputConfigFilePath	= maybeOutputConfigFilePath,
		getMaybeMaximumPGNNames		= maybeMaximumPGNNames,
		getPGNOptionsList		= pgnOptionsList,
		getMaybePersistence		= maybePersistence,
		getUIOptions			= uiOptions
	} = Text.ShowList.showsAssociationList' . Data.Maybe.maybe id (
		(:) . (,) outputConfigFilePathTag . shows
	 ) maybeOutputConfigFilePath . Data.Maybe.maybe id (
		(:) . (,) maximumPGNNamesTag . shows
	 ) maybeMaximumPGNNames $ Data.Maybe.maybe id (
		(:) . (,) persistenceTag . shows
	 ) maybePersistence [
		(
			showString Input.PGNOptions.tag "List",
			shows pgnOptionsList
		), (
			Input.UIOptions.tag,
			shows uiOptions
		)
	 ]

instance (Num column, Num row) => Data.Default.Default (IOOptions row column) where
	def = MkIOOptions {
		getMaybeOutputConfigFilePath	= Nothing,
		getMaybeMaximumPGNNames		= Nothing,
		getPGNOptionsList		= [],
		getMaybePersistence		= Nothing,
		getUIOptions			= Data.Default.def
	}

instance (
	HXT.XmlPickler	column,
	HXT.XmlPickler	row,
	Integral	column,
	Integral	row,
	Show		column,
	Show		row
 ) => HXT.XmlPickler (IOOptions row column) where
	xpickle	= HXT.xpDefault Data.Default.def . HXT.xpElem tag . HXT.xpWrap (
		\(a, b, c, d, e) -> mkIOOptions a b c d e,	-- Construct.
		\MkIOOptions {
			getMaybeOutputConfigFilePath	= maybeOutputConfigFilePath,
			getMaybeMaximumPGNNames		= maybeMaximumPGNNames,
			getPGNOptionsList		= pgnOptionsList,
			getMaybePersistence		= maybePersistence,
			getUIOptions			= uiOptions
		} -> (
			maybeOutputConfigFilePath,
			maybeMaximumPGNNames,
			pgnOptionsList,
			maybePersistence,
			uiOptions
		) -- Deconstruct.
	 ) $ HXT.xp5Tuple (
		HXT.xpOption $ HXT.xpTextAttr outputConfigFilePathTag {-can't be null-}
	 ) (
		HXT.xpAttrImplied maximumPGNNamesTag HXT.xpInt
	 ) HXT.xpickle {-PGNOptions-} (
		HXT.xpOption $ HXT.xpElem persistenceTag (
			HXT.xpTextAttr filePathTag `HXT.xpPair` HXT.xpDefault True (HXT.xpAttr automaticTag HXT.xpickle {-Bool-})
		)
	 ) HXT.xpickle {-UIOptions-}

-- | Smart constructor.
mkIOOptions
	:: Maybe System.FilePath.FilePath		-- ^ An optional path to a file, into which the unprocessed configuration, formatted as XML, should be written (obliterating any existing file-contents).
	-> Maybe MaximumPGNNames			-- ^ The optional maximum number of names, of matching PGN-games, to display; @Nothing@ implies no maximum.
	-> [Input.PGNOptions.PGNOptions]		-- ^ How to find & process PGN-databases.
	-> Maybe (System.FilePath.FilePath, Bool)	-- ^ Optional path to a file, into which game-state can be persisted (obliterating any existing content), & whether to save this state automatically after each move.
	-> Input.UIOptions.UIOptions row column
	-> IOOptions row column
mkIOOptions maybeOutputConfigFilePath maybeMaximumPGNNames pgnOptionsList maybePersistence uiOptions
	| Data.Maybe.maybe False (
		not . System.FilePath.isValid {-i.e. non-null on POSIX-}
	) maybeOutputConfigFilePath		= Control.Exception.throw . Data.Exception.mkInvalidDatum . showString "BishBosh.Input.IOOptions.mkIOOptions:\tinvalid " $ showString outputConfigFilePathTag "."
	| Data.Maybe.isJust maybeMaximumPGNNames
	, null pgnOptionsList			= Control.Exception.throw . Data.Exception.mkIncompatibleData . showString "Specification of " $ shows maximumPGNNamesTag " is only irrelevant when at least one PGN-database has been referenced."
	| Just maximumPGNNames	<- maybeMaximumPGNNames
	, maximumPGNNames < 0			= Control.Exception.throw . Data.Exception.mkOutOfBounds . showString "The maximum number of names, of matching PGN-games to display, can't be negative; " $ shows maximumPGNNames "."
	| duplicateFilePaths@(_ : _)	<- map head . filter ((/= 1) . length) . ToolShed.Data.Foldable.gather $ map (System.FilePath.normalise . Input.PGNOptions.getDatabaseFilePath) pgnOptionsList
	= Control.Exception.throw . Data.Exception.mkDuplicateData . showString "BishBosh.Input.IOOptions.mkIOOptions:\tduplicate " . showString Input.PGNOptions.databaseFilePathTag . Text.ShowList.showsAssociation $ shows duplicateFilePaths "."
	| Data.Maybe.maybe False (
		not . System.FilePath.isValid {-i.e. non-null on POSIX-} . fst {-file-path-}
	) maybePersistence			= Control.Exception.throw . Data.Exception.mkInvalidDatum . showString "BishBosh.Input.IOOptions.mkIOOptions:\tinvalid path for " $ showString persistenceTag "."
	| otherwise	= MkIOOptions {
		getMaybeOutputConfigFilePath	= System.FilePath.normalise <$> maybeOutputConfigFilePath,
		getMaybeMaximumPGNNames		= maybeMaximumPGNNames,
		getPGNOptionsList		= pgnOptionsList,
		getMaybePersistence		= Control.Arrow.first System.FilePath.normalise <$> maybePersistence,
		getUIOptions			= uiOptions
	}

-- | The type of a function used to transform 'IOOptions'.
type Transformation row column	= IOOptions row column -> IOOptions row column

-- | Mutator.
setMaybeOutputConfigFilePath :: Maybe System.FilePath.FilePath -> Transformation row column
setMaybeOutputConfigFilePath maybeOutputConfigFilePath ioOptions
	| Data.Maybe.maybe False (
		not . System.FilePath.isValid {-i.e. non-null on POSIX-}
	) maybeOutputConfigFilePath	= Control.Exception.throw . Data.Exception.mkInvalidDatum . showString "BishBosh.Input.IOOptions.setMaybeOutputConfigFilePath:\tinvalid " $ showString outputConfigFilePathTag "."
	| otherwise	= ioOptions {
		getMaybeOutputConfigFilePath	= maybeOutputConfigFilePath
	}

-- | Mutator.
setEitherNativeUIOrCECPOptions :: Input.UIOptions.EitherNativeUIOrCECPOptions row column -> Transformation row column
setEitherNativeUIOrCECPOptions eitherNativeUIOrCECPOptions ioOptions@MkIOOptions { getUIOptions = uiOptions }	= ioOptions {
	getUIOptions	= uiOptions {
		Input.UIOptions.getEitherNativeUIOrCECPOptions	= eitherNativeUIOrCECPOptions
	}
}

-- | Mutator.
setMaybePrintMoveTree :: Maybe Property.Tree.Depth -> Transformation row column
setMaybePrintMoveTree maybePrintMoveTree ioOptions@MkIOOptions { getUIOptions = uiOptions }	= ioOptions {
	getUIOptions	= uiOptions {
		Input.UIOptions.getMaybePrintMoveTree	= maybePrintMoveTree
	}
}

-- | Mutator.
updateCECPFeature :: Input.CECPFeatures.Feature -> Transformation row column
updateCECPFeature feature ioOptions@MkIOOptions { getUIOptions = uiOptions }	= ioOptions {
	getUIOptions	= Input.UIOptions.updateCECPFeature feature uiOptions
}

-- | Mutator.
deleteCECPFeature :: Input.CECPFeatures.Feature -> Transformation row column
deleteCECPFeature feature ioOptions@MkIOOptions { getUIOptions = uiOptions }	= ioOptions {
	getUIOptions	= Input.UIOptions.deleteCECPFeature feature uiOptions
}

-- | Mutator.
setVerbosity :: Distribution.Verbosity.Verbosity -> Transformation row column
setVerbosity verbosity ioOptions@MkIOOptions { getUIOptions = uiOptions }	= ioOptions {
	getUIOptions	= uiOptions {
		Input.UIOptions.getVerbosity	= verbosity
	}
}