content: -- 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/>.
  
  -- | Types and utilies around unreachable backends and failing to process
  -- various kinds of messages.
  module Wire.API.Unreachable
    ( -- * Failed to process
      UnreachableUsers (unreachableUsers),
      unreachableFromList,
    )
  where
  
  import Data.Aeson qualified as A
  import Data.Id
  import Data.List.NonEmpty
  import Data.List.NonEmpty qualified as NE
  import Data.OpenApi qualified as S
  import Data.Qualified
  import Data.Schema
  import Imports
  
  newtype UnreachableUsers = UnreachableUsers {unreachableUsers :: NonEmpty (Qualified UserId)}
    deriving stock (Eq, Show)
    deriving (A.ToJSON, A.FromJSON, S.ToSchema) via Schema UnreachableUsers
  
  instance Semigroup UnreachableUsers where
    (UnreachableUsers m) <> (UnreachableUsers n) = UnreachableUsers . NE.nub $ m <> n
  
  instance ToSchema UnreachableUsers where
    schema =
      named "UnreachableUsers" $
        UnreachableUsers
          <$> unreachableUsers
            .= nonEmptyArray schema
  
  unreachableFromList :: [Qualified UserId] -> Maybe UnreachableUsers
  unreachableFromList = fmap (UnreachableUsers . NE.nub) . nonEmpty
  