Contract.hs

-- @generated by keiro-dsl 0.18.0.0 (language keiro-dsl 6) from contract replay_events; do not edit.
module Generated.CheckedMappingReplay.ReplayEvents.Contract
  ( ReplayEventsPayload (..)
  , ReplayLinkedData (..)
  , replayEventsTopic
  , messageTypeOf
  , encodeReplayEventsPayload
  , parseReplayEventsPayload
  ) where

import Data.Aeson (Value, object, withObject, withText, (.=))
import Data.Aeson.Types (Parser, explicitParseField, parseEither)
import Generated.CheckedMappingReplay.Nominals qualified as Nominals
import Generated.CheckedMappingReplay.Structural.NominalLeaves qualified as NominalLeaves
import Data.Text (Text)
import qualified Data.Text as T

-- topic constants
replayEventsTopic :: Text
replayEventsTopic = "checked.mapping.replay.events"

-- the closed payload set (discriminated by "messageType")
data ReplayLinkedData = ReplayLinkedData {retainedId :: !Nominals.RetainedId}
  deriving stock (Eq, Show)

data ReplayEventsPayload
  = ReplayLinked !ReplayLinkedData
  deriving stock (Eq, Show)

messageTypeOf :: ReplayEventsPayload -> Text
messageTypeOf = \case
  ReplayLinked {} -> "ReplayLinked"

encodeReplayEventsPayload :: ReplayEventsPayload -> Value
encodeReplayEventsPayload = \case
  ReplayLinked payload ->
    object
      [ "messageType" .= ("ReplayLinked" :: Text),
        "retainedId" .= NominalLeaves.encodeRetainedIdLeaf payload.retainedId
      ]

parseReplayEventsPayload :: Value -> Either Text ReplayEventsPayload
parseReplayEventsPayload = mapLeftText . parseEither (withObject "ReplayEventsPayload" go)
  where
    go o = do
      kind <- explicitParseField (withText "messageType" validateMessageType) o "messageType"
      case kind of
        "ReplayLinked" ->
          ReplayLinked
            <$> ( ReplayLinkedData
                    <$> explicitParseField NominalLeaves.parseRetainedIdLeaf o "retainedId"
                )
        _ -> fail "validated message type was not handled"

mapLeftText :: Either String b -> Either Text b
mapLeftText = either (Left . T.pack) Right

validateMessageType :: Text -> Parser Text
validateMessageType kind
  | kind `elem` ["ReplayLinked"] = pure kind
  | otherwise = fail ("unknown message type " <> show kind <> "; expected one of: ReplayLinked")