import { GraphQLError } from 'graphql';

export enum ApolloServerErrorCode {
  INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR',
  GRAPHQL_PARSE_FAILED = 'GRAPHQL_PARSE_FAILED',
  GRAPHQL_VALIDATION_FAILED = 'GRAPHQL_VALIDATION_FAILED',
  PERSISTED_QUERY_NOT_FOUND = 'PERSISTED_QUERY_NOT_FOUND',
  PERSISTED_QUERY_NOT_SUPPORTED = 'PERSISTED_QUERY_NOT_SUPPORTED',
  BAD_USER_INPUT = 'BAD_USER_INPUT',
  OPERATION_RESOLUTION_FAILURE = 'OPERATION_RESOLUTION_FAILURE',
  BAD_REQUEST = 'BAD_REQUEST',
}

export enum ApolloServerValidationErrorCode {
  INTROSPECTION_DISABLED = 'INTROSPECTION_DISABLED',
  MAX_RECURSIVE_SELECTIONS_EXCEEDED = 'MAX_RECURSIVE_SELECTIONS_EXCEEDED',
}

/**
 * unwrapResolverError is a useful helper function for `formatError` hooks.
 * Errors thrown in resolvers are wrapped by graphql-js in a GraphQLError that
 * adds context such as the `path` to the field in the operation. If you'd like
 * to look directly at the original error thrown in the resolver (with whatever
 * data is on that error object, but without fields like `path`), you can use
 * this function. Note that other GraphQLErrors that contain `originalError`
 * (like parse errors) are not unwrapped by this function.
 */
export function unwrapResolverError(error: unknown): unknown {
  if (error instanceof GraphQLError && error.path && error.originalError) {
    return error.originalError;
  }
  return error;
}