{- 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 Utility.Url as Url
import qualified Command.Add
import qualified Annex
import qualified Backend.URL
import Annex.Content
import Logs.Web

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

seek :: [CommandSeek]
seek = [withStrings start]

start :: String -> CommandStart
start s = notBareRepo $ go $ parseURI s
	where
		go Nothing = error $ "bad url " ++ s
		go (Just url) = do
			file <- liftIO $ url2file url
			showStart "addurl" file
			next $ perform s file

perform :: String -> FilePath -> CommandPerform
perform url file = do
	fast <- Annex.getState Annex.fast
	if fast then nodownload url file else download url file

download :: String -> FilePath -> CommandPerform
download url file = do
	showAction $ "downloading " ++ url ++ " "
	let dummykey = Backend.URL.fromUrl url
	tmp <- fromRepo $ gitAnnexTmpLocation dummykey
	liftIO $ createDirectoryIfMissing True (parentDir tmp)
	stopUnless (liftIO $ Url.download 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
	let key = Backend.URL.fromUrl url
	setUrlPresent key url
	next $ Command.Add.cleanup file key False

url2file :: URI -> IO FilePath
url2file url = do
	whenM (doesFileExist file) $
		error $ "already have this url in " ++ file
	liftIO $ print file
	return file
	where
		file = escape $ uriRegName auth ++ uriPath url ++ uriQuery url
		escape = replace "/" "_" . replace "?" "_"
		auth = fromMaybe (error $ "bad url " ++ show url) $ uriAuthority url