import { DocumentNode } from '../language/ast';
import { Source } from '../language/source';
import { GraphQLSchema, GraphQLSchemaValidationOptions } from '../type/schema';
import { ParseOptions } from '../language/parser';

interface BuildSchemaOptions extends GraphQLSchemaValidationOptions {
  /**
   * Descriptions are defined as preceding string literals, however an older
   * experimental version of the SDL supported preceding comments as
   * descriptions. Set to true to enable this deprecated behavior.
   * This option is provided to ease adoption and will be removed in v16.
   *
   * Default: false
   */
  commentDescriptions?: boolean;

  /**
   * Set to true to assume the SDL is valid.
   *
   * Default: false
   */
  assumeValidSDL?: boolean;
}

/**
 * This takes the ast of a schema document produced by the parse function in
 * src/language/parser.js.
 *
 * If no schema definition is provided, then it will look for types named Query
 * and Mutation.
 *
 * Given that AST it constructs a GraphQLSchema. The resulting schema
 * has no resolve methods, so execution will use default resolvers.
 *
 * Accepts options as a second argument:
 *
 *    - commentDescriptions:
 *        Provide true to use preceding comments as the description.
 *
 */
export function buildASTSchema(
  documentAST: DocumentNode,
  options?: BuildSchemaOptions,
): GraphQLSchema;

/**
 * A helper function to build a GraphQLSchema directly from a source
 * document.
 */
export function buildSchema(
  source: string | Source,
  options?: BuildSchemaOptions & ParseOptions,
): GraphQLSchema;