module Hasura.GraphQL.Execute.Mutation
  ( convertMutationSelectionSet,
  )
where

import Data.Environment qualified as Env
import Data.HashMap.Strict qualified as Map
import Data.HashMap.Strict.InsOrd qualified as OMap
import Data.Tagged qualified as Tagged
import Hasura.Base.Error
import Hasura.GraphQL.Context
import Hasura.GraphQL.Execute.Action
import Hasura.GraphQL.Execute.Backend
import Hasura.GraphQL.Execute.Common
import Hasura.GraphQL.Execute.Instances ()
import Hasura.GraphQL.Execute.Remote
import Hasura.GraphQL.Execute.RemoteJoin.Collect qualified as RJ
import Hasura.GraphQL.Execute.Resolve
import Hasura.GraphQL.Namespace
import Hasura.GraphQL.ParameterizedQueryHash
import Hasura.GraphQL.Parser
import Hasura.GraphQL.Parser.Directives
import Hasura.GraphQL.Transport.HTTP.Protocol qualified as GH
import Hasura.Logging qualified as L
import Hasura.Metadata.Class
import Hasura.Prelude
import Hasura.QueryTags
import Hasura.RQL.IR
import Hasura.RQL.Types
import Hasura.SQL.AnyBackend qualified as AB
import Hasura.Server.Types (RequestId (..))
import Hasura.Session
import Hasura.Tracing qualified as Tracing
import Language.GraphQL.Draft.Syntax qualified as G
import Network.HTTP.Client qualified as HTTP
import Network.HTTP.Types qualified as HTTP

convertMutationAction ::
  ( MonadIO m,
    MonadError QErr m,
    MonadMetadataStorage (MetadataStorageT m)
  ) =>
  Env.Environment ->
  L.Logger L.Hasura ->
  UserInfo ->
  HTTP.Manager ->
  HTTP.RequestHeaders ->
  Maybe GH.GQLQueryText ->
  ActionMutation ('Postgres 'Vanilla) Void (UnpreparedValue ('Postgres 'Vanilla)) ->
  m ActionExecutionPlan
convertMutationAction env logger userInfo manager reqHeaders gqlQueryText = \case
  AMSync s -> pure $ AEPSync $ resolveActionExecution env logger userInfo s actionExecContext gqlQueryText
  AMAsync s ->
    AEPAsyncMutation
      <$> liftEitherM (runMetadataStorageT $ resolveActionMutationAsync s reqHeaders userSession)
  where
    userSession = _uiSession userInfo
    actionExecContext = ActionExecContext manager reqHeaders $ _uiSession userInfo

convertMutationSelectionSet ::
  forall m.
  ( Tracing.MonadTrace m,
    MonadIO m,
    MonadError QErr m,
    MonadMetadataStorage (MetadataStorageT m),
    MonadGQLExecutionCheck m,
    MonadQueryTags m
  ) =>
  Env.Environment ->
  L.Logger L.Hasura ->
  GQLContext ->
  SQLGenCtx ->
  UserInfo ->
  HTTP.Manager ->
  HTTP.RequestHeaders ->
  [G.Directive G.Name] ->
  G.SelectionSet G.NoFragments G.Name ->
  [G.VariableDefinition] ->
  GH.GQLReqUnparsed ->
  SetGraphqlIntrospectionOptions ->
  RequestId ->
  -- | Graphql Operation Name
  Maybe G.Name ->
  m (ExecutionPlan, ParameterizedQueryHash)
convertMutationSelectionSet
  env
  logger
  gqlContext
  SQLGenCtx {stringifyNum}
  userInfo
  manager
  reqHeaders
  directives
  fields
  varDefs
  gqlUnparsed
  introspectionDisabledRoles
  reqId
  maybeOperationName = do
    mutationParser <-
      onNothing (gqlMutationParser gqlContext) $
        throw400 ValidationFailed "no mutations exist"

    (resolvedDirectives, resolvedSelSet) <- resolveVariables varDefs (fromMaybe Map.empty (GH._grVariables gqlUnparsed)) directives fields
    -- Parse the GraphQL query into the RQL AST
    unpreparedQueries ::
      RootFieldMap (MutationRootField UnpreparedValue) <-
      (mutationParser >>> (`onLeft` reportParseErrors)) resolvedSelSet

    -- Process directives on the mutation
    _dirMap <-
      (`onLeft` reportParseErrors)
        =<< runParseT (parseDirectives customDirectives (G.DLExecutable G.EDLMUTATION) resolvedDirectives)

    let parameterizedQueryHash = calculateParameterizedQueryHash resolvedSelSet

    -- Transform the RQL AST into a prepared SQL query
    txs <- flip OMap.traverseWithKey unpreparedQueries $ \rootFieldName rootFieldUnpreparedValue -> do
      case rootFieldUnpreparedValue of
        RFDB sourceName exists ->
          AB.dispatchAnyBackend @BackendExecute
            exists
            \(SourceConfigWith (sourceConfig :: SourceConfig b) queryTagsConfig (MDBR db)) -> do
              let mutationQueryTagsAttributes = encodeQueryTags $ QTMutation $ MutationMetadata reqId maybeOperationName rootFieldName parameterizedQueryHash
              let queryTagsComment = Tagged.untag $ createQueryTags @m mutationQueryTagsAttributes queryTagsConfig
              let (noRelsDBAST, remoteJoins) = RJ.getRemoteJoinsMutationDB db
              dbStepInfo <- flip runReaderT queryTagsComment $ mkDBMutationPlan @b userInfo stringifyNum sourceName sourceConfig noRelsDBAST
              pure $ ExecStepDB [] (AB.mkAnyBackend dbStepInfo) remoteJoins
        RFRemote remoteField -> do
          RemoteFieldG remoteSchemaInfo resultCustomizer resolvedRemoteField <- runVariableCache $ resolveRemoteField userInfo remoteField
          pure $ buildExecStepRemote remoteSchemaInfo resultCustomizer G.OperationTypeMutation [G.SelectionField resolvedRemoteField]
        RFAction action -> do
          let (noRelsDBAST, remoteJoins) = RJ.getRemoteJoinsActionMutation action
          (actionName, _fch) <- pure $ case noRelsDBAST of
            AMSync s -> (_aaeName s, _aaeForwardClientHeaders s)
            AMAsync s -> (_aamaName s, _aamaForwardClientHeaders s)
          plan <- convertMutationAction env logger userInfo manager reqHeaders (Just (GH._grQuery gqlUnparsed)) noRelsDBAST
          pure $ ExecStepAction plan (ActionsInfo actionName _fch) remoteJoins -- `_fch` represents the `forward_client_headers` option from the action
          -- definition which is currently being ignored for actions that are mutations
        RFRaw s -> flip onLeft throwError =<< executeIntrospection userInfo s introspectionDisabledRoles
    return (txs, parameterizedQueryHash)