-- | This module is used by the push and put commands to apply the a bundle to a
-- remote repository. By remote I do not necessarily mean a repository on another
-- machine, it is just not the repository we're located in.
module Darcs.RemoteApply ( remote_apply, apply_as ) where

import System.Exit ( ExitCode )

import Darcs.Flags ( DarcsFlag( ApplyAs, Debug ) )
import Darcs.Utils ( breakCommand )
import Darcs.URL ( is_url, is_ssh )
import Darcs.External
import Printer

remote_apply :: [DarcsFlag] -> String -> Doc -> IO ExitCode
remote_apply opts repodir bundle 
    = case apply_as opts of
        Nothing -> if is_ssh repodir
                   then apply_via_ssh opts repodir bundle
                   else if is_url repodir
                        then apply_via_url opts repodir bundle
                        else apply_via_local opts repodir bundle
        Just un -> if is_ssh repodir
                   then apply_via_ssh_and_sudo repodir un bundle
                   else apply_via_sudo un repodir bundle

apply_as :: [DarcsFlag] -> Maybe String
apply_as (ApplyAs user:_) = Just user
apply_as (_:fs) = apply_as fs
apply_as [] = Nothing
apply_via_sudo :: String -> String -> Doc -> IO ExitCode
apply_via_sudo user repo bundle =
    pipeDoc "sudo" ["-u",user,"darcs","apply","--all","--repodir",repo] bundle
apply_via_local :: [DarcsFlag] -> String -> Doc -> IO ExitCode
apply_via_local opts repo bundle =
    pipeDoc "darcs" ("apply":"--all":"--repodir":repo:applyopts opts) bundle

apply_via_url :: [DarcsFlag] -> String -> Doc -> IO ExitCode
apply_via_url opts repo bundle =
    do maybeapply <- maybeURLCmd "APPLY" repo
       case maybeapply of
         Nothing -> apply_via_local opts repo bundle
         Just apply ->
           do let (cmd, args) = breakCommand apply
              pipeDoc cmd (args ++ [repo]) bundle

apply_via_ssh :: [DarcsFlag] -> String -> Doc -> IO ExitCode
apply_via_ssh opts repo bundle =
    pipeDocSSH addr ["darcs apply --all "++unwords (applyopts opts)++" --repodir '"++path++"'"] bundle
        where (addr,':':path) = break (==':') repo

apply_via_ssh_and_sudo :: String -> String -> Doc -> IO ExitCode
apply_via_ssh_and_sudo repo username bundle =
    pipeDocSSH addr ["sudo -u "++username++
                         " darcs apply --all --repodir '"++path++"'"] bundle
        where (addr,':':path) = break (==':') repo

applyopts :: [DarcsFlag] -> [String]
applyopts opts = if Debug `elem` opts then ["--debug"] else []