/**
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';
var lodash = require('lodash');
var isPlainObject = lodash.isPlainObject;
var isObject = lodash.isObject;
var isString = lodash.isString var isFunction = lodash.isFunction;
var ErrorMessage = require('../classes/error-message.js');
var hapiRequestInformationExtractor = require('../request-extractors/hapi.js');
var errorHandlerRouter = require('../error-router.js');

/**
 * The Hapi error handler function serves simply to create an error message
 * and begin that error message on the path of correct population.
 * @function hapiErrorHandler
 * @param {Object} req - The Hapi request object
 * @param {Any} err - The error input
 * @param {Object} config - the env configuration
 * @returns {ErrorMessage} - a partially or fully populated instance of
 *  ErrorMessage
 */
function hapiErrorHandler(req, err, config) {
  var service = "";
  var version = "";

  if (isPlainObject(config) && isPlainObject(config.serviceContext)) {

    service = config.serviceContext.service;
    version = config.serviceContext.version;
  }

  var em = new ErrorMessage()
               .consumeRequestInformation(hapiRequestInformationExtractor(req))
               .setServiceContext(service, version);

  errorHandlerRouter(err, em);

  return em;
}

/**
 * The register function serves to attach the hapiErrorHandler to specific
 * points in the hapi request-response lifecycle. Namely: it attaches to the
 * 'request-error' event in Hapi which is emitted when a plugin or receiver
 * throws an error while executing and the 'onPreResponse' event to intercept
 * error code carrying requests before they are sent back to the client so that
 * the errors can be logged to the Error Reporting API.
 * @function hapiRegisterFunction
 * @param {AuthClient} client - A bound reference to the auth client for
 *  communication with the Google Error API
 * @param {NormalizedConfigurationVariables} config - the environmental
 *  configuration
 * @param {Hapi.Server} server - A Hapi server instance
 * @param {Object} options - The server configuration options object
 * @param {Function} next - The Hapi callback to move execution to the next
 *  plugin
 * @returns {Undefined} - returns the execution of the next callback
 */
function hapiRegisterFunction(client, config, server, options, next) {

  if (isObject(server)) {
    if (isFunction(server.on)) {
      server.on('request-error', function(req, err) {
        var em = hapiErrorHandler(req, err, config);

        client.sendError(em);
      });
    }

    if (isFunction(server.ext)) {

      server.ext('onPreResponse', function(request, reply) {
        var em = null;

        if (isObject(request) && isObject(request.response) &&
            request.response.isBoom) {
          em = hapiErrorHandler(request, new Error(request.response.message),
                                config);

          client.sendError(em);
        }

        if (isObject(reply) && isFunction(reply.continue)) {
          reply.continue();
        }
      });
    }
  }

  if (isFunction(next)) {

    return next();
  }
}

/**
 * The handler setup function serves to create the actual Hapi plugin object
 * which consists of some basic Hapi metadata and a bound instance of the
 * hapiRegisterFunction which is bound to a null context and two initial
 * arugments: an inited client which the handler will use to send information
 * back to Error Reporting API and an object which contains the environmental
 * configuration.
 * @param {AuthClient} client - an inited auth client instance
 * @param {NormalizedConfigurationVariables} config - the environmental
 *  configuration
 * @returns {Object} - the actual Hapi plugin
 */
function handlerSetup(client, config) {
  var hapiPlugin = {register : hapiRegisterFunction.bind(null, client, config)};
  var version = isPlainObject(config) && isString(config.version)
                    ? config.version
                    : "0.0.0";

  hapiPlugin.register.attributes = {
    name : '@google/cloud-errors',
    version : version
  };

  return hapiPlugin;
}

module.exports = handlerSetup;

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Fix parse erro caused by Clang formatter