{- git-annex command-line option parsing
 -
 - Copyright 2010-2015 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module CmdLine.GitAnnex.Options where

import Options.Applicative
import Options.Applicative.Builder.Internal
import Control.Concurrent

import Annex.Common
import qualified Git.Config
import qualified Git.Construct
import Git.Types
import Types.TrustLevel
import Types.NumCopies
import Types.Messages
import Types.Command
import Types.DeferredParse
import Types.DesktopNotify
import qualified Annex
import qualified Remote
import qualified Limit
import qualified Limit.Wanted
import CmdLine.Option
import CmdLine.Usage
import CmdLine.GlobalSetter
import qualified Backend
import qualified Types.Backend as Backend

-- Global options that are accepted by all git-annex sub-commands,
-- although not always used.
gitAnnexGlobalOptions :: [GlobalOption]
gitAnnexGlobalOptions = commonGlobalOptions ++
	[ globalSetter setnumcopies $ option auto
		( long "numcopies" <> short 'N' <> metavar paramNumber
		<> help "override default number of copies"
		<> hidden
		)
	, globalSetter (Remote.forceTrust Trusted) $ strOption
		( long "trust" <> metavar paramRemote
		<> help "override trust setting"
		<> hidden
		<> completeRemotes
		)
	, globalSetter (Remote.forceTrust SemiTrusted) $ strOption
		( long "semitrust" <> metavar paramRemote
		<> help "override trust setting back to default"
		<> hidden
		<> completeRemotes
		)
	, globalSetter (Remote.forceTrust UnTrusted) $ strOption
		( long "untrust" <> metavar paramRemote
		<> help "override trust setting to untrusted"
		<> hidden
		<> completeRemotes
		)
	, globalSetter setgitconfig $ strOption
		( long "config" <> short 'c' <> metavar "NAME=VALUE"
		<> help "override git configuration setting"
		<> hidden
		)
	, globalSetter setuseragent $ strOption
		( long "user-agent" <> metavar paramName
		<> help "override default User-Agent"
		<> hidden
		)
	, globalFlag (Annex.setFlag "trustglacier")
		( long "trust-glacier"
		<> help "Trust Amazon Glacier inventory"
		<> hidden
		)
	, globalFlag (setdesktopnotify mkNotifyFinish)
		( long "notify-finish"
		<> help "show desktop notification after transfer finishes"
		<> hidden
		)
	, globalFlag (setdesktopnotify mkNotifyStart)
		( long "notify-start"
		<> help "show desktop notification after transfer starts"
		<> hidden
		)
	]
  where
	setnumcopies n = Annex.changeState $ \s -> s { Annex.forcenumcopies = Just $ NumCopies n }
	setuseragent v = Annex.changeState $ \s -> s { Annex.useragent = Just v }
	setgitconfig v = Annex.adjustGitRepo $ \r -> Git.Config.store v $ 
		r { gitGlobalOpts = gitGlobalOpts r ++ [Param "-c", Param v] }
	setdesktopnotify v = Annex.changeState $ \s -> s { Annex.desktopnotify = Annex.desktopnotify s <> v }

{- Parser that accepts all non-option params. -}
cmdParams :: CmdParamsDesc -> Parser CmdParams
cmdParams paramdesc = many $ argument str
	( metavar paramdesc
	)

parseAutoOption :: Parser Bool
parseAutoOption = switch
	( long "auto" <> short 'a'
	<> help "automatic mode"
	)

parseRemoteOption :: Parser RemoteName -> Parser (DeferredParse Remote)
parseRemoteOption p = DeferredParse 
	. (fromJust <$$> Remote.byNameWithUUID)
	. Just <$> p

data FromToOptions
	= FromRemote (DeferredParse Remote)
	| ToRemote (DeferredParse Remote)

instance DeferredParseClass FromToOptions where
	finishParse (FromRemote v) = FromRemote <$> finishParse v
	finishParse (ToRemote v) = ToRemote <$> finishParse v

parseFromToOptions :: Parser FromToOptions
parseFromToOptions = 
	(FromRemote <$> parseFromOption) 
	<|> (ToRemote <$> parseToOption)

parseFromOption :: Parser (DeferredParse Remote)
parseFromOption = parseRemoteOption $ strOption
	( long "from" <> short 'f' <> metavar paramRemote
	<> help "source remote"
	<> completeRemotes
	)

parseToOption :: Parser (DeferredParse Remote)
parseToOption = parseRemoteOption $ strOption
	( long "to" <> short 't' <> metavar paramRemote
	<> help "destination remote"
	<> completeRemotes
	)

-- Options for acting on keys, rather than work tree files.
data KeyOptions
	= WantAllKeys
	| WantUnusedKeys
	| WantSpecificKey Key
	| WantIncompleteKeys

parseKeyOptions :: Bool -> Parser KeyOptions
parseKeyOptions allowincomplete = if allowincomplete
	then base
		<|> flag' WantIncompleteKeys
			( long "incomplete"
			<> help "resume previous downloads"
			)
	else base
  where
	base = parseAllOption
		<|> flag' WantUnusedKeys
			( long "unused" <> short 'U'
			<> help "operate on files found by last run of git-annex unused"
			)
		<|> (WantSpecificKey <$> option (str >>= parseKey)
			( long "key" <> metavar paramKey
			<> help "operate on specified key"
			))

parseAllOption :: Parser KeyOptions
parseAllOption = flag' WantAllKeys
	( long "all" <> short 'A'
	<> help "operate on all versions of all files"
	)

parseKey :: Monad m => String -> m Key
parseKey = maybe (fail "invalid key") return . file2key

-- Options to match properties of annexed files.
annexedMatchingOptions :: [GlobalOption]
annexedMatchingOptions = concat
	[ nonWorkTreeMatchingOptions'
	, fileMatchingOptions'
	, combiningOptions
	, [timeLimitOption]
	]

-- Matching options that don't need to examine work tree files.
nonWorkTreeMatchingOptions :: [GlobalOption]
nonWorkTreeMatchingOptions = nonWorkTreeMatchingOptions' ++ combiningOptions

nonWorkTreeMatchingOptions' :: [GlobalOption]
nonWorkTreeMatchingOptions' = 
	[ globalSetter Limit.addIn $ strOption
		( long "in" <> short 'i' <> metavar paramRemote
		<> help "match files present in a remote"
		<> hidden
		<> completeRemotes
		)
	, globalSetter Limit.addCopies $ strOption
		( long "copies" <> short 'C' <> metavar paramRemote
		<> help "skip files with fewer copies"
		<> hidden
		)
	, globalSetter (Limit.addLackingCopies False) $ strOption
		( long "lackingcopies" <> metavar paramNumber
		<> help "match files that need more copies"
		<> hidden
		)
	, globalSetter (Limit.addLackingCopies True) $ strOption
		( long "approxlackingcopies" <> metavar paramNumber
		<> help "match files that need more copies (faster)"
		<> hidden
		)
	, globalSetter Limit.addInBackend $ strOption
		( long "inbackend" <> short 'B' <> metavar paramName
		<> help "match files using a key-value backend"
		<> hidden
		<> completeBackends
		)
	, globalSetter Limit.addInAllGroup $ strOption
		( long "inallgroup" <> metavar paramGroup
		<> help "match files present in all remotes in a group"
		<> hidden
		)
	, globalSetter Limit.addMetaData $ strOption
		( long "metadata" <> metavar "FIELD=VALUE"
		<> help "match files with attached metadata"
		<> hidden
		)
	, globalFlag Limit.Wanted.addWantGet
		( long "want-get"
		<> help "match files the repository wants to get"
		<> hidden
		)
	, globalFlag Limit.Wanted.addWantDrop
		( long "want-drop"
		<> help "match files the repository wants to drop"
		<> hidden
		)
	]

-- Options to match files which may not yet be annexed.
fileMatchingOptions :: [GlobalOption]
fileMatchingOptions = fileMatchingOptions' ++ combiningOptions

fileMatchingOptions' :: [GlobalOption]
fileMatchingOptions' =
	[ globalSetter Limit.addExclude $ strOption
		( long "exclude" <> short 'x' <> metavar paramGlob
		<> help "skip files matching the glob pattern"
		<> hidden
		)
	, globalSetter Limit.addInclude $ strOption
		( long "include" <> short 'I' <> metavar paramGlob
		<> help "limit to files matching the glob pattern"
		<> hidden
		)
	, globalSetter Limit.addLargerThan $ strOption
		( long "largerthan" <> metavar paramSize
		<> help "match files larger than a size"
		<> hidden
		)
	, globalSetter Limit.addSmallerThan $ strOption
		( long "smallerthan" <> metavar paramSize
		<> help "match files smaller than a size"
		<> hidden
		)
	]

combiningOptions :: [GlobalOption]
combiningOptions = 
	[ longopt "not" "negate next option"
	, longopt "and" "both previous and next option must match"
	, longopt "or" "either previous or next option must match"
	, shortopt '(' "open group of options"
	, shortopt ')' "close group of options"
	]
  where
	longopt o h = globalFlag (Limit.addToken o) ( long o <> help h <> hidden )
	shortopt o h = globalFlag (Limit.addToken [o]) ( short o <> help h <> hidden )

jsonOption :: GlobalOption
jsonOption = globalFlag (Annex.setOutput JSONOutput)
	( long "json" <> short 'j'
	<> help "enable JSON output"
	<> hidden
	)

-- Note that a command that adds this option should wrap its seek
-- action in `allowConcurrentOutput`.
jobsOption :: GlobalOption
jobsOption = globalSetter set $ 
	option auto
		( long "jobs" <> short 'J' <> metavar paramNumber
		<> help "enable concurrent jobs"
		<> hidden
		)
  where
	set n = do
		Annex.changeState $ \s -> s { Annex.concurrentjobs = Just n }
		c <- liftIO getNumCapabilities
		when (n > c) $
			liftIO $ setNumCapabilities n

timeLimitOption :: GlobalOption
timeLimitOption = globalSetter Limit.addTimeLimit $ strOption
	( long "time-limit" <> short 'T' <> metavar paramTime
	<> help "stop after the specified amount of time"
	<> hidden
	)

data DaemonOptions = DaemonOptions
	{ foregroundDaemonOption :: Bool
	, stopDaemonOption :: Bool
	}

parseDaemonOptions :: Parser DaemonOptions
parseDaemonOptions = DaemonOptions
	<$> switch
		( long "foreground"
		<> help "do not daemonize"
		)
	<*> switch
		( long "stop"
		<> help "stop daemon"
		)
completeRemotes :: HasCompleter f => Mod f a
completeRemotes = completer $ mkCompleter $ \input -> do
	r <- maybe (pure Nothing) (Just <$$> Git.Config.read)
		=<< Git.Construct.fromCwd
	return $ filter (input `isPrefixOf`) 
		(maybe [] (mapMaybe remoteName . remotes) r)
		
		
completeBackends :: HasCompleter f => Mod f a
completeBackends = completeWith (map Backend.name Backend.list)
