{-# 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 qualified Git
import qualified Git.Config

import qualified Remote.Git
import qualified Remote.GCrypt
#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.Tahoe
import qualified Remote.Glacier
import qualified Remote.Ddar
import qualified Remote.Hook
import qualified Remote.External

remoteTypes :: [RemoteType]
remoteTypes =
	[ Remote.Git.remote
	, Remote.GCrypt.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.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
	mrmt <- generate t r u c gc
	return $ adjustReadOnly . addHooks <$> mrmt

{- Updates a local git Remote, re-reading its git config. -}
updateRemote :: Remote -> Annex (Maybe Remote)
updateRemote remote = do
	m <- readRemoteLog
	remote' <- updaterepo $ repo 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 ]