{- git-annex command
 -
 - Copyright 2011 Joey Hess <joey@kitenet.net>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

module Command.AddUrl where

import Network.URI

import Common.Annex
import Command
import qualified Backend
import qualified Command.Add
import qualified Annex
import qualified Backend.URL
import qualified Utility.Url as Url
import Annex.Content
import Logs.Web
import qualified Option

def :: [Command]
def = [withOptions [fileOption] $
	command "addurl" (paramRepeating paramUrl) seek "add urls to annex"]

fileOption :: Option
fileOption = Option.field [] "file" paramFile "specify what file the url is added to"

seek :: [CommandSeek]
seek = [withField fileOption return $ \f ->
	withStrings $ start f]

start :: Maybe FilePath -> String -> CommandStart
start optfile s = notBareRepo $ go $ fromMaybe bad $ parseURI s
	where
		bad = fromMaybe (error $ "bad url " ++ s) $
			parseURI $ escapeURIString isUnescapedInURI s
		go url = do
			let file = fromMaybe (url2file url) optfile
			showStart "addurl" file
			next $ perform s file

perform :: String -> FilePath -> CommandPerform
perform url file = ifAnnexed file addurl geturl
	where
		geturl = do
			whenM (liftIO $ doesFileExist file) $
				error $ "not overwriting existing " ++ file
			fast <- Annex.getState Annex.fast
			if fast then nodownload url file else download url file
		addurl (key, _backend) = do
			setUrlPresent key url
			next $ return True

download :: String -> FilePath -> CommandPerform
download url file = do
	showAction $ "downloading " ++ url ++ " "
	let dummykey = Backend.URL.fromUrl url Nothing
	tmp <- fromRepo $ gitAnnexTmpLocation dummykey
	liftIO $ createDirectoryIfMissing True (parentDir tmp)
	stopUnless (downloadUrl [url] tmp) $ do
		[(backend, _)] <- Backend.chooseBackends [file]
		k <- Backend.genKey tmp backend
		case k of
			Nothing -> stop
			Just (key, _) -> do
				moveAnnex key tmp
				setUrlPresent key url
				next $ Command.Add.cleanup file key True

nodownload :: String -> FilePath -> CommandPerform
nodownload url file = do
	(exists, size) <- liftIO $ Url.exists url
	unless exists $
		error $ "unable to access url: " ++ url
	let key = Backend.URL.fromUrl url size
	setUrlPresent key url
	next $ Command.Add.cleanup file key False

url2file :: URI -> FilePath
url2file url = escape $ uriRegName auth ++ uriPath url ++ uriQuery url
	where
		escape = replace "/" "_" . replace "?" "_"
		auth = fromMaybe (error $ "bad url " ++ show url) $ uriAuthority url