{- Copyright 2016 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU AGPL version 3 or higher.
 -}

module CmdLine (CmdLine(..), Mode(..), get, parse) where

import Types
import Options.Applicative
import qualified Data.ByteString.UTF8 as BU8

data CmdLine = CmdLine
	{ mode :: Mode
	, keytype :: KeyType
	, testMode :: Bool
	, gui :: Bool
	}
	deriving (Show)

data Mode = Backup | Restore
	deriving (Show)

parse :: Parser CmdLine
parse = CmdLine
	<$> (backup <|> restore)
	<*> keytypeopt
	<*> testmodeswitch
	<*> guiswitch
  where
	backup = flag' Backup
		( long "backup"
		<> help "Store a secret key in keysafe."
		)
	restore = flag' Restore
		( long "restore"
		<> help "Retrieve a secret key from keysafe."
		)
	keytypeopt = KeyType . BU8.fromString <$> strOption
		( long "type"
		<> help "Type of key (eg, \"gpg\")."
		)
	testmodeswitch = switch
		( long "testmode"
		<> help "Avoid using expensive cryptographic operation to secure key. Use for testing only, not with real secret keys."
		)
	guiswitch = switch
		( long "gui"
		<> help "Use GUI interface for interaction. Default is to use readline interface when run in a terminal, and GUI otherwise."
		)

get :: IO CmdLine
get = execParser opts
  where
	opts = info (helper <*> parse)
		( fullDesc
		<> header "keysafe - securely back up secret keys"
		)