import isPromise from './jsutils/isPromise';
import { validateSchema } from './type/validate';
import { parse } from './language/parser';
import { validate } from './validation/validate';
import { execute } from './execution/execute';
export function graphql(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver) {
  var _arguments = arguments;

  /* eslint-enable no-redeclare */
  // Always return a Promise for a consistent API.
  return new Promise(function (resolve) {
    return resolve( // Extract arguments from object args if provided.
    _arguments.length === 1 ? graphqlImpl(argsOrSchema) : graphqlImpl({
      schema: argsOrSchema,
      source: source,
      rootValue: rootValue,
      contextValue: contextValue,
      variableValues: variableValues,
      operationName: operationName,
      fieldResolver: fieldResolver,
      typeResolver: typeResolver
    }));
  });
}
/**
 * The graphqlSync function also fulfills GraphQL operations by parsing,
 * validating, and executing a GraphQL document along side a GraphQL schema.
 * However, it guarantees to complete synchronously (or throw an error) assuming
 * that all field resolvers are also synchronous.
 */

export function graphqlSync(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver, typeResolver) {
  /* eslint-enable no-redeclare */
  // Extract arguments from object args if provided.
  var result = arguments.length === 1 ? graphqlImpl(argsOrSchema) : graphqlImpl({
    schema: argsOrSchema,
    source: source,
    rootValue: rootValue,
    contextValue: contextValue,
    variableValues: variableValues,
    operationName: operationName,
    fieldResolver: fieldResolver,
    typeResolver: typeResolver
  }); // Assert that the execution was synchronous.

  if (isPromise(result)) {
    throw new Error('GraphQL execution failed to complete synchronously.');
  }

  return result;
}

function graphqlImpl(args) {
  var schema = args.schema,
      source = args.source,
      rootValue = args.rootValue,
      contextValue = args.contextValue,
      variableValues = args.variableValues,
      operationName = args.operationName,
      fieldResolver = args.fieldResolver,
      typeResolver = args.typeResolver; // Validate Schema

  var schemaValidationErrors = validateSchema(schema);

  if (schemaValidationErrors.length > 0) {
    return {
      errors: schemaValidationErrors
    };
  } // Parse


  var document;

  try {
    document = parse(source);
  } catch (syntaxError) {
    return {
      errors: [syntaxError]
    };
  } // Validate


  var validationErrors = validate(schema, document);

  if (validationErrors.length > 0) {
    return {
      errors: validationErrors
    };
  } // Execute


  return execute({
    schema: schema,
    document: document,
    rootValue: rootValue,
    contextValue: contextValue,
    variableValues: variableValues,
    operationName: operationName,
    fieldResolver: fieldResolver,
    typeResolver: typeResolver
  });
}