module Hasura.GraphQL.Execute.LiveQuery.Options
  ( LiveQueriesOptions (..),
    BatchSize,
    unBatchSize,
    RefetchInterval,
    unRefetchInterval,
    mkLiveQueriesOptions,
    mkBatchSize,
    mkRefetchInterval,
  )
where

import Data.Aeson qualified as J
import Hasura.Prelude
import Hasura.RQL.Types.Common

data LiveQueriesOptions = LiveQueriesOptions
  { _lqoBatchSize :: !BatchSize,
    _lqoRefetchInterval :: !RefetchInterval
  }
  deriving (Show, Eq)

mkLiveQueriesOptions :: Maybe BatchSize -> Maybe RefetchInterval -> LiveQueriesOptions
mkLiveQueriesOptions batchSize refetchInterval =
  LiveQueriesOptions
    { _lqoBatchSize = fromMaybe (BatchSize 100) batchSize,
      _lqoRefetchInterval = fromMaybe (RefetchInterval 1) refetchInterval
    }

instance J.ToJSON LiveQueriesOptions where
  toJSON (LiveQueriesOptions batchSize refetchInterval) =
    J.object
      [ "batch_size" J..= batchSize,
        "refetch_delay" J..= refetchInterval
      ]

instance J.FromJSON LiveQueriesOptions where
  parseJSON = J.withObject "live query options" \o ->
    LiveQueriesOptions <$> o J..: "batch_size"
      <*> o J..: "refetch_delay"

newtype BatchSize = BatchSize {unBatchSize :: NonNegativeInt}
  deriving (Show, Eq, J.ToJSON, J.FromJSON)

mkBatchSize :: Int -> Maybe BatchSize
mkBatchSize x = BatchSize <$> mkNonNegativeInt x

-- TODO this is treated as milliseconds in fromEnv and as seconds in ToJSON.
--      ideally this would have e.g. ... unRefetchInterval :: Milliseconds
newtype RefetchInterval = RefetchInterval {unRefetchInterval :: NonNegativeDiffTime}
  deriving (Show, Eq, J.ToJSON, J.FromJSON)

mkRefetchInterval :: DiffTime -> Maybe RefetchInterval
mkRefetchInterval x = RefetchInterval <$> mkNonNegativeDiffTime x