{- This file is part of Vervis.
 -
 - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Vervis.Handler.Git
    ( getGitRefDiscoverR
    , postGitUploadRequestR
    )
where

import Prelude

import Control.Monad.IO.Class (liftIO)
import Data.Git.Storage (isRepo, withRepo)
import Data.String (fromString)
import Data.Text (Text)
import Data.Text.Encoding (encodeUtf8)
import Network.Git.Get (parseService)
import Network.Git.Transport.HTTP.Fetch.RefDiscovery
import Network.Git.Transport.HTTP.Fetch.UploadRequest
import Yesod.Core.Handler

import Vervis.BinaryBody (decodeRequestBody)
import Vervis.Content
import Vervis.Foundation (Handler)
import Vervis.Path (askRepoDir)

getGitRefDiscoverR :: Text -> Text -> Handler GitRefDiscovery
getGitRefDiscoverR sharer repo = do
    path <- askRepoDir sharer repo
    let pathG = fromString path
    seemsThere <- liftIO $ isRepo pathG
    if seemsThere
        then do
            rq <- getRequest
            case reqGetParams rq of
                [("service", servT)] ->
                    case parseService $ encodeUtf8 servT of
                        Just serv -> do
                            rd <- liftIO $ withRepo pathG $
                                flip buildRefDiscover' serv
                            setHeader "Cache-Control" "no-cache"
                            return $ GitRefDiscovery rd
                        Nothing -> permissionDenied "Service not supported"
                _ -> notFound
        else notFound

postGitUploadRequestR :: Text -> Text -> Handler GitUploadPackResult
postGitUploadRequestR sharer repo = do
    path <- askRepoDir sharer repo
    let pathG = fromString path
    seemsThere <- liftIO $ isRepo pathG
    if seemsThere
        then do
            ereq <- decodeRequestBody getUploadRequest
            case ereq of
                Left _   -> invalidArgs ["UploadRequest"]
                Right ur -> return $ GitUploadPackResult ()
        else notFound