'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.graphql = graphql;
exports.graphqlSync = graphqlSync;

var _validate = require('./type/validate');

var _parser = require('./language/parser');

var _validate2 = require('./validation/validate');

var _execute = require('./execution/execute');

/**
 * This is the primary entry point function for fulfilling GraphQL operations
 * by parsing, validating, and executing a GraphQL document along side a
 * GraphQL schema.
 *
 * More sophisticated GraphQL servers, such as those which persist queries,
 * may wish to separate the validation and execution phases to a static time
 * tooling step, and a server runtime step.
 *
 * Accepts either an object with named arguments, or individual arguments:
 *
 * schema:
 *    The GraphQL type system to use when validating and executing a query.
 * source:
 *    A GraphQL language formatted string representing the requested operation.
 * rootValue:
 *    The value provided as the first argument to resolver functions on the top
 *    level type (e.g. the query object type).
 * variableValues:
 *    A mapping of variable name to runtime value to use for all variables
 *    defined in the requestString.
 * operationName:
 *    The name of the operation to use if requestString contains multiple
 *    possible operations. Can be omitted if requestString contains only
 *    one operation.
 * fieldResolver:
 *    A resolver function to use when one is not provided by the schema.
 *    If not provided, the default field resolver is used (which looks for a
 *    value or method on the source value with the field's name).
 */

/* eslint-disable no-redeclare */
/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */

function graphql(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver) {
  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.schema, argsOrSchema.source, argsOrSchema.rootValue, argsOrSchema.contextValue, argsOrSchema.variableValues, argsOrSchema.operationName, argsOrSchema.fieldResolver) : graphqlImpl(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver));
  });
}

/**
 * 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.
 */

/* eslint-disable no-redeclare */
function graphqlSync(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver) {
  // Extract arguments from object args if provided.
  var result = arguments.length === 1 ? graphqlImpl(argsOrSchema.schema, argsOrSchema.source, argsOrSchema.rootValue, argsOrSchema.contextValue, argsOrSchema.variableValues, argsOrSchema.operationName, argsOrSchema.fieldResolver) : graphqlImpl(argsOrSchema, source, rootValue, contextValue, variableValues, operationName, fieldResolver);

  // Assert that the execution was synchronous.
  if (result.then) {
    throw new Error('GraphQL execution failed to complete synchronously.');
  }

  return result;
}

function graphqlImpl(schema, source, rootValue, contextValue, variableValues, operationName, fieldResolver) {
  // Validate Schema
  var schemaValidationErrors = (0, _validate.validateSchema)(schema);
  if (schemaValidationErrors.length > 0) {
    return { errors: schemaValidationErrors };
  }

  // Parse
  var document = void 0;
  try {
    document = (0, _parser.parse)(source);
  } catch (syntaxError) {
    return { errors: [syntaxError] };
  }

  // Validate
  var validationErrors = (0, _validate2.validate)(schema, document);
  if (validationErrors.length > 0) {
    return { errors: validationErrors };
  }

  // Execute
  return (0, _execute.execute)(schema, document, rootValue, contextValue, variableValues, operationName, fieldResolver);
}