{-# LANGUAGE GeneralizedNewtypeDeriving #-}

-- This file is part of the Wire Server implementation.
--
-- Copyright (C) 2022 Wire Swiss GmbH <opensource@wire.com>
--
-- This program is free software: you can redistribute it and/or modify it under
-- the terms of the GNU Affero General Public License as published by the Free
-- Software Foundation, either version 3 of the License, or (at your option) any
-- later version.
--
-- This program is distributed in the hope that it will be useful, but WITHOUT
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-- FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
-- details.
--
-- You should have received a copy of the GNU Affero General Public License along
-- with this program. If not, see <https://www.gnu.org/licenses/>.

-- | Scim attribute names. these are case-insensitive
module Web.Scim.AttrName where

import Data.Aeson.Types (FromJSONKey, ToJSONKey)
import Data.Attoparsec.ByteString.Char8
import qualified Data.CaseInsensitive as CI
import Data.Hashable
import Data.String (IsString, fromString)
import Data.Text (Text, cons)
import Data.Text.Encoding (decodeUtf8)
import Prelude hiding (takeWhile)

-- | An attribute (e.g. username).
--
-- ATTRNAME  = ALPHA *(nameChar)
-- NOTE: We use the FromJSONKey instance of Text. The default instances parses
-- a list of key values instead of a map
newtype AttrName
  = AttrName Text
  deriving (Show, FromJSONKey, ToJSONKey)

instance Eq AttrName where
  AttrName a == AttrName b = CI.foldCase a == CI.foldCase b

instance Ord AttrName where
  compare (AttrName a) (AttrName b) = compare (CI.foldCase a) (CI.foldCase b)

instance Hashable AttrName where
  hashWithSalt x (AttrName a) = hashWithSalt x (CI.foldCase a)

instance IsString AttrName where
  fromString = AttrName . fromString

-- | Attribute name parser.
pAttrName :: Parser AttrName
pAttrName =
  (\c str -> AttrName (cons c (decodeUtf8 str)))
    <$> letter_ascii
    <*> takeWhile (\x -> isDigit x || isAlpha_ascii x || x == '-' || x == '_')

-- | Attribute name renderer.
rAttrName :: AttrName -> Text
rAttrName (AttrName x) = x