{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}

module Hasura.Metadata.DTO.MetadataDTOSpec (spec) where

import Data.Aeson
  ( FromJSON (parseJSON),
    ToJSON (toJSON),
    Value,
    eitherDecode,
    eitherDecodeFileStrict',
  )
import Data.Aeson.QQ.Simple (aesonQQ)
import Data.Aeson.Types (parseEither)
import Data.Either (isLeft, isRight)
import Data.FileEmbed (makeRelativeToProject, strToExp)
import Hasura.Metadata.DTO.Metadata (MetadataDTO (..))
import Hasura.Metadata.DTO.MetadataV1 (MetadataV1 (..))
import Hasura.Metadata.DTO.MetadataV2 (MetadataV2 (..))
import Hasura.Metadata.DTO.MetadataV3 (MetadataV3 (..))
import Hasura.Metadata.DTO.Placeholder (PlaceholderArray (PlaceholderArray))
import Hasura.Prelude
import Hasura.RQL.Types.Metadata (Metadata, metadataToDTO)
import Test.Hspec

spec :: Spec
spec = describe "MetadataDTO" $ do
  describe "distinguishing metadata revisions" $ do
    it "serializes v1" $ do
      let output = V1 $ emptyMetadataV1
      let expected = [aesonQQ|{ "version": 1, "tables": [] }|]
      toJSON output `shouldBe` expected

    it "serializes v2" $ do
      let output = V2 $ emptyMetadataV2
      let expected = [aesonQQ|{ "version": 2, "tables": [] }|]
      toJSON output `shouldBe` expected

    it "serializes v3" $ do
      let output = V3 $ emptyMetadataV3
      let expected = [aesonQQ|{ "version": 3, "sources": [] }|]
      toJSON output `shouldBe` expected

    it "parses v2" $ do
      let input = "{ \"version\": 2, \"tables\": [] }"
      let expected = V2 $ emptyMetadataV2
      let actual = eitherDecode input :: Either String MetadataDTO
      actual `shouldBe` Right expected

    it "parses v3" $ do
      let input = "{\"version\": 3, \"sources\": [] }"
      let expected = V3 $ emptyMetadataV3
      let actual = eitherDecode input :: Either String MetadataDTO
      actual `shouldBe` Right expected

    it "fails parsing v3 on version mismatch" $ do
      let input = "{\"version\": 3, \"tables\": [] }"
      let actual = eitherDecode input :: Either String MetadataDTO
      actual `shouldSatisfy` isLeft

    it "assumes v1 if version field is absent" $ do
      let input = "{\"tables\": [] }"
      let expected = V1 $ emptyMetadataV1
      let actual = eitherDecode input :: Either String MetadataDTO
      actual `shouldBe` Right expected

    it "fails parsing if input is not v1-compatible, and version is absent" $ do
      let input = "{\"sources\": [] }"
      let actual = eitherDecode input :: Either String MetadataDTO
      actual `shouldSatisfy` isLeft

  beforeAll getMetadataFixture $ do
    describe "v3" $ do
      it "deserializes and re-serializes equivalently to Metadata" $ \metadataFixture -> do
        let dto = parseEither parseJSON =<< metadataFixture :: Either String MetadataDTO
        let fromDto = toJSON <$> dto
        fromDto `shouldSatisfy` isRight
        fromDto `shouldBe` metadataFixture

      it "converts metadata to DTO to JSON to metadata" $ \metadataFixture -> do
        let origMetadata = parseEither (parseJSON @Metadata) =<< metadataFixture
        let dto = metadataToDTO <$> origMetadata
        let json = toJSON <$> dto
        let metadata = parseEither (parseJSON @Metadata) =<< json
        metadata `shouldSatisfy` isRight
        metadata `shouldBe` origMetadata

emptyMetadataV3 :: MetadataV3
emptyMetadataV3 =
  MetadataV3
    { metaV3Sources = PlaceholderArray mempty,
      metaV3RemoteSchemas = Nothing,
      metaV3QueryCollections = Nothing,
      metaV3Allowlist = Nothing,
      metaV3Actions = Nothing,
      metaV3CustomTypes = Nothing,
      metaV3CronTriggers = Nothing,
      metaV3RestEndpoints = Nothing,
      metaV3ApiLimits = Nothing,
      metaV3MetricsConfig = Nothing,
      metaV3InheritedRoles = Nothing,
      metaV3GraphqlSchemaIntrospection = Nothing,
      metaV3Network = Nothing,
      metaV3BackendConfigs = Nothing
    }

emptyMetadataV2 :: MetadataV2
emptyMetadataV2 =
  MetadataV2
    { metaV2Actions = Nothing,
      metaV2Allowlist = Nothing,
      metaV2CronTriggers = Nothing,
      metaV2CustomTypes = Nothing,
      metaV2Functions = Nothing,
      metaV2QueryCollections = Nothing,
      metaV2RemoteSchemas = Nothing,
      metaV2Tables = PlaceholderArray mempty
    }

emptyMetadataV1 :: MetadataV1
emptyMetadataV1 =
  MetadataV1
    { metaV1Functions = Nothing,
      metaV1RemoteSchemas = Nothing,
      metaV1Tables = PlaceholderArray mempty
    }

getMetadataFixture :: IO (Either String Value)
getMetadataFixture = do
  let filePath = $(strToExp =<< makeRelativeToProject "../cli/internal/metadatautil/testdata/json/t2/metadata.json")
  -- Round-trip fixture data through the server's old serialization so that we
  -- will get consistent results on the next round-trip.
  metadata <- eitherDecodeFileStrict' filePath :: IO (Either String Metadata)
  return $ toJSON <$> metadata