-- SPDX-FileCopyrightText: 2022 Steffen Jost <jost@tcs.ifi.lmu.de>
--
-- SPDX-License-Identifier: AGPL-3.0-or-later



module Handler.Admin.Ldap
  ( getAdminLdapR
  , postAdminLdapR
  ) where

import Import
-- import qualified Control.Monad.State.Class as State
-- import Data.Aeson (encode)
import qualified Data.CaseInsensitive as CI
import qualified Data.Text as Text
import qualified Data.Text.Encoding as Text
-- import qualified Data.Set  as Set
import Foundation.Yesod.Auth (decodeUserTest,ldapLookupAndUpsert,campusUserFailoverMode,CampusUserConversionException())
import Handler.Utils

import qualified Ldap.Client as Ldap
import Auth.LDAP


getAdminLdapR,  postAdminLdapR :: Handler Html
getAdminLdapR = postAdminLdapR
postAdminLdapR = do
  ((presult, pwidget), penctype) <- runFormPost $ identifyForm ("adminLdapLookup"::Text) $ \html -> 
    flip (renderAForm FormStandard) html $ areq textField (fslI MsgAdminUserIdent) Nothing

  let procFormPerson :: Text -> Handler (Maybe (Ldap.AttrList []))
      procFormPerson lid = do
        ldapPool' <- getsYesod $ view _appLdapPool
        case ldapPool' of 
          Nothing -> addMessage Error (text2Html "LDAP Configuration missing.") >> return Nothing
          Just ldapPool -> do 
            addMessage Info  $ text2Html "Input for LDAP test received."
            ldapData <- campusUser'' ldapPool campusUserFailoverMode lid                      
            decodedErr <- decodeUserTest (pure $ CI.mk lid) $ concat ldapData
            whenIsLeft decodedErr $ addMessageI Error
            return ldapData
  mbLdapData <- formResultMaybe presult procFormPerson


  ((uresult, uwidget), uenctype) <- runFormPost $ identifyForm ("adminLdapUpsert"::Text) $ \html -> 
    flip (renderAForm FormStandard) html $ areq textField (fslI MsgAdminUserIdent) Nothing
  let procFormUpsert :: Text -> Handler (Maybe (Either CampusUserConversionException (Entity User)))
      procFormUpsert lid = pure <$> runDB (try $ ldapLookupAndUpsert lid)
  mbLdapUpsert <- formResultMaybe uresult procFormUpsert


  actionUrl <- fromMaybe AdminLdapR <$> getCurrentRoute
  siteLayoutMsg MsgMenuLdap $ do
    setTitleI MsgMenuLdap
    let personForm = wrapForm pwidget def
                      { formAction = Just $ SomeRoute actionUrl
                      , formEncoding = penctype
                      }
        upsertForm = wrapForm uwidget def 
                      { formAction = Just $ SomeRoute actionUrl
                      , formEncoding = uenctype
                      }
        presentUtf8   lv = Text.intercalate ", " (either tshow id . Text.decodeUtf8' <$> lv)
        presentLatin1 lv = Text.intercalate ", " (                 Text.decodeLatin1 <$> lv)

    -- TODO: use i18nWidgetFile instead if this is to become permanent
    $(widgetFile "ldap")