{-# LANGUAGE CPP #-}

{- git-annex remote list
 -
 - Copyright 2011,2012 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Remote.List where

import qualified Data.Map as M

import Annex.Common
import qualified Annex
import Logs.Remote
import Types.Remote
import Annex.UUID
import Remote.Helper.Hooks
import Remote.Helper.ReadOnly
import Remote.Helper.Export
import qualified Git
import qualified Git.Config

import qualified Remote.Git
import qualified Remote.GCrypt
import qualified Remote.P2P
#ifdef WITH_S3
import qualified Remote.S3
#endif
import qualified Remote.Bup
import qualified Remote.Directory
import qualified Remote.Rsync
import qualified Remote.Web
import qualified Remote.BitTorrent
#ifdef WITH_WEBDAV
import qualified Remote.WebDAV
#endif
import qualified Remote.Adb
import qualified Remote.Tahoe
import qualified Remote.Glacier
import qualified Remote.Ddar
import qualified Remote.Hook
import qualified Remote.External

remoteTypes :: [RemoteType]
remoteTypes = map adjustExportableRemoteType
	[ Remote.Git.remote
	, Remote.GCrypt.remote
	, Remote.P2P.remote
#ifdef WITH_S3
	, Remote.S3.remote
#endif
	, Remote.Bup.remote
	, Remote.Directory.remote
	, Remote.Rsync.remote
	, Remote.Web.remote
	, Remote.BitTorrent.remote
#ifdef WITH_WEBDAV
	, Remote.WebDAV.remote
#endif
	, Remote.Adb.remote
	, Remote.Tahoe.remote
	, Remote.Glacier.remote
	, Remote.Ddar.remote
	, Remote.Hook.remote
	, Remote.External.remote
	]

{- Builds a list of all available Remotes.
 - Since doing so can be expensive, the list is cached. -}
remoteList :: Annex [Remote]
remoteList = do
	rs <- Annex.getState Annex.remotes
	if null rs
		then remoteList' False
		else return rs

remoteList' :: Bool -> Annex [Remote]
remoteList' autoinit = do
	m <- readRemoteLog
	rs <- concat <$> mapM (process m) remoteTypes
	Annex.changeState $ \s -> s { Annex.remotes = rs }
	return rs
  where
	process m t = enumerate t autoinit 
		>>= mapM (remoteGen m t) 
		>>= return . catMaybes

{- Forces the remoteList to be re-generated, re-reading the git config. -}
remoteListRefresh :: Annex [Remote]
remoteListRefresh = do
	newg <- inRepo Git.Config.reRead
	Annex.changeState $ \s -> s 
		{ Annex.remotes = []
		, Annex.repo = newg
		}
	remoteList

{- Generates a Remote. -}
remoteGen :: M.Map UUID RemoteConfig -> RemoteType -> Git.Repo -> Annex (Maybe Remote)
remoteGen m t r = do
	u <- getRepoUUID r
	gc <- Annex.getRemoteGitConfig r
	let c = fromMaybe M.empty $ M.lookup u m
	generate t r u c gc >>= maybe
		(return Nothing)
		(Just <$$> adjustExportable . adjustReadOnly . addHooks)

{- Updates a local git Remote, re-reading its git config. -}
updateRemote :: Remote -> Annex (Maybe Remote)
updateRemote remote = do
	m <- readRemoteLog
	remote' <- updaterepo =<< getRepo remote
	remoteGen m (remotetype remote) remote'
  where
	updaterepo r
		| Git.repoIsLocal r || Git.repoIsLocalUnknown r =
			Remote.Git.configRead False r
		| otherwise = return r

{- Checks if a remote is syncable using git. -}
gitSyncableRemote :: Remote -> Bool
gitSyncableRemote r = remotetype r `elem`
	[ Remote.Git.remote, Remote.GCrypt.remote, Remote.P2P.remote ]
