{- git-annex assistant webapp repository list
 -
 - Copyright 2012,2013 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU AGPL version 3 or higher.
 -}

{-# LANGUAGE TypeFamilies, QuasiQuotes, MultiParamTypeClasses, TemplateHaskell, OverloadedStrings, RankNTypes, CPP #-}

module Assistant.WebApp.RepoList where

import Assistant.WebApp.Common
import Assistant.DaemonStatus
import Assistant.WebApp.Notifications
import Assistant.WebApp.Utility
import qualified Annex
import qualified Remote
import qualified Types.Remote as Remote
import Remote.List (remoteListRefresh)
import Annex.UUID (getUUID)
import Logs.Remote
import Logs.Trust
import Config
import Config.Cost
import qualified Git
#ifdef WITH_XMPP
#endif

import qualified Data.Map as M
import qualified Data.Set as S
import qualified Data.Text as T

data Actions
	= DisabledRepoActions
		{ setupRepoLink :: Route WebApp }
	| SyncingRepoActions
		{ setupRepoLink :: Route WebApp
		, syncToggleLink :: Route WebApp
		}
	| NotSyncingRepoActions
		{ setupRepoLink :: Route WebApp
		, syncToggleLink :: Route WebApp
		}

mkSyncingRepoActions :: UUID -> Actions
mkSyncingRepoActions u = SyncingRepoActions
	{ setupRepoLink = EditRepositoryR u
	, syncToggleLink = DisableSyncR u
	}

mkNotSyncingRepoActions :: UUID -> Actions
mkNotSyncingRepoActions u = NotSyncingRepoActions
	{ setupRepoLink = EditRepositoryR u
	, syncToggleLink = EnableSyncR u
	}

needsEnabled :: Actions -> Bool
needsEnabled (DisabledRepoActions _) = True
needsEnabled _ = False

notSyncing :: Actions -> Bool
notSyncing (SyncingRepoActions _ _) = False
notSyncing _ = True

{- Called by client to get a list of repos, that refreshes
 - when new repos are added.
 -
 - Returns a div, which will be inserted into the calling page.
 -}
getRepoListR :: RepoListNotificationId -> Handler RepHtml
getRepoListR (RepoListNotificationId nid reposelector) = do
	waitNotifier getRepoListBroadcaster nid
	p <- widgetToPageContent $ repoListDisplay reposelector
	hamletToRepHtml $ [hamlet|^{pageBody p}|]

mainRepoSelector :: RepoSelector
mainRepoSelector = RepoSelector
	{ onlyCloud = False
	, onlyConfigured = False
	, includeHere = True
	, nudgeAddMore = False
	}

{- List of cloud repositories, configured and not. -}
cloudRepoList :: Widget
cloudRepoList = repoListDisplay $ RepoSelector
	{ onlyCloud = True
	, onlyConfigured = False
	, includeHere = False
	, nudgeAddMore = False
	}

repoListDisplay :: RepoSelector -> Widget
repoListDisplay reposelector = do
	autoUpdate ident (NotifierRepoListR reposelector) (10 :: Int) (10 :: Int)
	addScript $ StaticR jquery_ui_core_js
	addScript $ StaticR jquery_ui_widget_js
	addScript $ StaticR jquery_ui_mouse_js
	addScript $ StaticR jquery_ui_sortable_js

	repolist <- lift $ repoList reposelector
	let addmore = nudgeAddMore reposelector
	let nootherrepos = length repolist < 2

	$(widgetFile "repolist")
  where
	ident = "repolist"

type RepoList = [(String, UUID, Actions)]

{- A list of known repositories, with actions that can be taken on them. -}
repoList :: RepoSelector -> Handler RepoList
repoList reposelector
	| onlyConfigured reposelector = list =<< configured
	| otherwise = list =<< (++) <$> configured <*> unconfigured
  where
	configured = do
		syncing <- S.fromList . syncRemotes
			<$> liftAssistant getDaemonStatus
		liftAnnex $ do
			rs <- filter wantedrepo . concat . Remote.byCost
				<$> Remote.enabledRemoteList
			let us = map Remote.uuid rs
			let make r = if r `S.member` syncing
				then mkSyncingRepoActions $ Remote.uuid r
				else mkNotSyncingRepoActions $ Remote.uuid r
			let l = zip us $ map make rs
			if includeHere reposelector
				then do
					u <- getUUID
					autocommit <- annexAutoCommit <$> Annex.getGitConfig
					let hereactions = if autocommit
						then mkSyncingRepoActions u
						else mkNotSyncingRepoActions u
					let here = (u, hereactions)
					return $ here : l
				else return l
	unconfigured = liftAnnex $ do
		m <- readRemoteLog
		map snd . catMaybes . filter wantedremote 
			. map (findinfo m)
			<$> (trustExclude DeadTrusted $ M.keys m)
	wantedrepo r
		| Remote.readonly r = False
		| onlyCloud reposelector = Git.repoIsUrl (Remote.repo r) && not (isXMPPRemote r)
		| otherwise = True
	wantedremote Nothing = False
	wantedremote (Just (iscloud, _))
		| onlyCloud reposelector = iscloud
		| otherwise = True
	findinfo m u = case M.lookup u m of
		Nothing -> Nothing
		Just c -> case M.lookup "type" c of
			Just "rsync" -> val True EnableRsyncR
			Just "directory" -> val False EnableDirectoryR
#ifdef WITH_S3
			Just "S3" -> val True EnableS3R
#endif
			Just "glacier" -> val True EnableGlacierR
#ifdef WITH_WEBDAV
			Just "webdav" -> val True EnableWebDAVR
#endif
			_ -> Nothing
	  where
		val iscloud r = Just (iscloud, (u, DisabledRepoActions $ r u))
	list l = liftAnnex $ do
		let l' = nubBy (\x y -> fst x == fst y) l
		l'' <- zip
			<$> Remote.prettyListUUIDs (map fst l')
			<*> pure l'
		return $ map (\(name, (uuid, actions)) -> (name, uuid, actions)) l''

getEnableSyncR :: UUID -> Handler ()
getEnableSyncR = flipSync True

getDisableSyncR :: UUID -> Handler ()
getDisableSyncR = flipSync False

flipSync :: Bool -> UUID -> Handler ()
flipSync enable uuid = do
	mremote <- liftAnnex $ Remote.remoteFromUUID uuid
	changeSyncable mremote enable
	redirectBack

getRepositoriesReorderR :: Handler ()
getRepositoriesReorderR = do
	{- Get uuid of the moved item, and the list it was moved within. -}
	moved <- fromjs <$> runInputGet (ireq textField "moved")
	list <- map fromjs <$> lookupGetParams "list[]"
	void $ liftAnnex $ do
		remote <- fromMaybe (error "Unknown UUID") <$>
			Remote.remoteFromUUID moved
		rs <- catMaybes <$> mapM Remote.remoteFromUUID list
		forM_ (reorderCosts remote rs) $ \(r, newcost) ->
			when (Remote.cost r /= newcost) $
				setRemoteCost r newcost
		remoteListRefresh
	liftAssistant updateSyncRemotes
  where
  	fromjs = toUUID . T.unpack

reorderCosts :: Remote -> [Remote] -> [(Remote, Cost)]
reorderCosts remote rs = zip rs'' (insertCostAfter costs i)
  where
	{- Find the index of the remote in the list that the remote
	 - was moved to be after.
	 - If it was moved to the start of the list, -1 -}
	i = fromMaybe 0 (elemIndex remote rs) - 1
	rs' = filter (\r -> Remote.uuid r /= Remote.uuid remote) rs
	costs = map Remote.cost rs'
	rs'' = (\(x, y) -> x ++ [remote] ++ y) $ splitAt (i + 1) rs'