{- git-annex command
 -
 - Copyright 2010 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Command.Whereis where

import qualified Data.Map as M

import Common.Annex
import Command
import Remote
import Logs.Trust

def :: [Command]
def = [command "whereis" paramPaths seek
	"lists repositories that have file content"]

seek :: [CommandSeek]
seek = [withValue (remoteMap id) $ \m ->
	withFilesInGit $ whenAnnexed $ start m]

start :: M.Map UUID Remote -> FilePath -> (Key, Backend) -> CommandStart
start remotemap file (key, _) = do
	showStart "whereis" file
	next $ perform remotemap key

perform :: M.Map UUID Remote -> Key -> CommandPerform
perform remotemap key = do
	locations <- keyLocations key
	(untrustedlocations, safelocations) <- trustPartition UnTrusted locations
	let num = length safelocations
	showNote $ show num ++ " " ++ copiesplural num
	pp <- prettyPrintUUIDs "whereis" safelocations
	unless (null safelocations) $ showLongNote pp
	pp' <- prettyPrintUUIDs "untrusted" untrustedlocations
	unless (null untrustedlocations) $ showLongNote $ untrustedheader ++ pp'
	forM_ (catMaybes $ map (`M.lookup` remotemap) locations) $
		performRemote key
	if null safelocations then stop else next $ return True
	where
		copiesplural 1 = "copy"
		copiesplural _ = "copies"
		untrustedheader = "The following untrusted locations may also have copies:\n"

performRemote :: Key -> Remote -> Annex () 
performRemote key remote = maybe noop go $ whereisKey remote
	where
		go a = do
			ls <- a key
			unless (null ls) $ showLongNote $ unlines $
				map (\l -> name remote ++ ": " ++ l) ls