{-# LANGUAGE TemplateHaskell #-}

module Hasura.SQL.Types
  ( ToSQL (..),
    toSQLTxt,
    CollectableType (..),
    ExtensionsSchema (..),
  )
where

import Autodocodec (Autodocodec (..), HasCodec (codec), dimapCodec, named, textCodec)
import Data.Aeson
import Data.Aeson.TH
import Hasura.Incremental (Cacheable)
import Hasura.Prelude
import Text.Builder qualified as TB

class ToSQL a where
  toSQL :: a -> TB.Builder

instance ToSQL TB.Builder where
  toSQL :: Builder -> Builder
toSQL Builder
x = Builder
x

instance (ToSQL a) => ToSQL (Maybe a) where
  toSQL :: Maybe a -> Builder
toSQL (Just a
a) = a -> Builder
forall a. ToSQL a => a -> Builder
toSQL a
a
  toSQL Maybe a
Nothing = Builder
forall a. Monoid a => a
mempty

toSQLTxt :: (ToSQL a) => a -> Text
toSQLTxt :: a -> Text
toSQLTxt = Builder -> Text
TB.run (Builder -> Text) -> (a -> Builder) -> a -> Text
forall b c a. (b -> c) -> (a -> b) -> a -> c
. a -> Builder
forall a. ToSQL a => a -> Builder
toSQL

-- | The type of all Postgres types (i.e. scalars and arrays). This type is parameterized so that
-- we can have both @'CollectableType' 'PGScalarType'@ and @'CollectableType' 'Hasura.RQL.Types.PGColumnType'@, for
-- when we care about the distinction made by 'Hasura.RQL.Types.PGColumnType'. If we ever change
-- 'Hasura.RQL.Types.PGColumnType' to handle arrays, not just scalars, then the parameterization can
-- go away.
--
-- TODO (from master): This is incorrect modeling, as 'PGScalarType' will capture anything (under 'PGUnknown').
-- This should be fixed when support for all types is merged.
data CollectableType a
  = CollectableTypeScalar !a
  | CollectableTypeArray !a
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instance (NFData a) => NFData (CollectableType a)

instance (Hashable a) => Hashable (CollectableType a)

instance (Cacheable a) => Cacheable (CollectableType a)

$(deriveJSON defaultOptions {constructorTagModifier = drop 6} ''CollectableType)

instance (ToSQL a) => ToSQL (CollectableType a) where
  toSQL :: CollectableType a -> Builder
toSQL = \case
    CollectableTypeScalar a
ty -> a -> Builder
forall a. ToSQL a => a -> Builder
toSQL a
ty
    -- typename array is an sql standard way of declaring types
    CollectableTypeArray a
ty -> a -> Builder
forall a. ToSQL a => a -> Builder
toSQL a
ty Builder -> Builder -> Builder
forall a. Semigroup a => a -> a -> a
<> Builder
" array"

-- | The name of the schema in which the graphql-engine will install database extensions.
newtype ExtensionsSchema = ExtensionsSchema {ExtensionsSchema -> Text
_unExtensionsSchema :: Text}
  deriving (Int -> ExtensionsSchema -> ShowS
[ExtensionsSchema] -> ShowS
ExtensionsSchema -> String
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-> (ExtensionsSchema -> String)
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-> Show ExtensionsSchema
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showList :: [ExtensionsSchema] -> ShowS
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  deriving (Value -> Parser [ExtensionsSchema]
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-> FromJSON ExtensionsSchema
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instance HasCodec ExtensionsSchema where
  codec :: JSONCodec ExtensionsSchema
codec = Text -> JSONCodec ExtensionsSchema -> JSONCodec ExtensionsSchema
forall input output.
Text -> ValueCodec input output -> ValueCodec input output
named Text
"ExtensionsSchema" (JSONCodec ExtensionsSchema -> JSONCodec ExtensionsSchema)
-> JSONCodec ExtensionsSchema -> JSONCodec ExtensionsSchema
forall a b. (a -> b) -> a -> b
$ (Text -> ExtensionsSchema)
-> (ExtensionsSchema -> Text)
-> Codec Value Text Text
-> JSONCodec ExtensionsSchema
forall oldOutput newOutput newInput oldInput context.
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-> Codec context newInput newOutput
dimapCodec Text -> ExtensionsSchema
ExtensionsSchema ExtensionsSchema -> Text
_unExtensionsSchema Codec Value Text Text
textCodec