/**
 * Copyright 2013-2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule React
 */

/* globals __REACT_DEVTOOLS_GLOBAL_HOOK__*/

'use strict';

var EventPluginUtils = require("./EventPluginUtils");
var ReactChildren = require("./ReactChildren");
var ReactComponent = require("./ReactComponent");
var ReactClass = require("./ReactClass");
var ReactContext = require("./ReactContext");
var ReactCurrentOwner = require("./ReactCurrentOwner");
var ReactElement = require("./ReactElement");
var ReactElementValidator = require("./ReactElementValidator");
var ReactDOM = require("./ReactDOM");
var ReactDOMTextComponent = require("./ReactDOMTextComponent");
var ReactDefaultInjection = require("./ReactDefaultInjection");
var ReactInstanceHandles = require("./ReactInstanceHandles");
var ReactMount = require("./ReactMount");
var ReactPerf = require("./ReactPerf");
var ReactPropTypes = require("./ReactPropTypes");
var ReactReconciler = require("./ReactReconciler");
var ReactServerRendering = require("./ReactServerRendering");

var assign = require("./Object.assign");
var findDOMNode = require("./findDOMNode");
var onlyChild = require("./onlyChild");

ReactDefaultInjection.inject();

var createElement = ReactElement.createElement;
var createFactory = ReactElement.createFactory;
var cloneElement = ReactElement.cloneElement;

if ("production" !== process.env.NODE_ENV) {
  createElement = ReactElementValidator.createElement;
  createFactory = ReactElementValidator.createFactory;
  cloneElement = ReactElementValidator.cloneElement;
}

var render = ReactPerf.measure('React', 'render', ReactMount.render);

var React = {
  Children: {
    map: ReactChildren.map,
    forEach: ReactChildren.forEach,
    count: ReactChildren.count,
    only: onlyChild
  },
  Component: ReactComponent,
  DOM: ReactDOM,
  PropTypes: ReactPropTypes,
  initializeTouchEvents: function(shouldUseTouch) {
    EventPluginUtils.useTouchEvents = shouldUseTouch;
  },
  createClass: ReactClass.createClass,
  createElement: createElement,
  cloneElement: cloneElement,
  createFactory: createFactory,
  createMixin: function(mixin) {
    // Currently a noop. Will be used to validate and trace mixins.
    return mixin;
  },
  constructAndRenderComponent: ReactMount.constructAndRenderComponent,
  constructAndRenderComponentByID: ReactMount.constructAndRenderComponentByID,
  findDOMNode: findDOMNode,
  render: render,
  renderToString: ReactServerRendering.renderToString,
  renderToStaticMarkup: ReactServerRendering.renderToStaticMarkup,
  unmountComponentAtNode: ReactMount.unmountComponentAtNode,
  isValidElement: ReactElement.isValidElement,
  withContext: ReactContext.withContext,

  // Hook for JSX spread, don't use this for anything else.
  __spread: assign
};

// Inject the runtime into a devtools global hook regardless of browser.
// Allows for debugging when the hook is injected on the page.
if (
  typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined' &&
  typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.inject === 'function') {
  __REACT_DEVTOOLS_GLOBAL_HOOK__.inject({
    CurrentOwner: ReactCurrentOwner,
    InstanceHandles: ReactInstanceHandles,
    Mount: ReactMount,
    Reconciler: ReactReconciler,
    TextComponent: ReactDOMTextComponent
  });
}

if ("production" !== process.env.NODE_ENV) {
  var ExecutionEnvironment = require("./ExecutionEnvironment");
  if (ExecutionEnvironment.canUseDOM && window.top === window.self) {

    // If we're in Chrome, look for the devtools marker and provide a download
    // link if not installed.
    if (navigator.userAgent.indexOf('Chrome') > -1) {
      if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ === 'undefined') {
        console.debug(
          'Download the React DevTools for a better development experience: ' +
          'http://fb.me/react-devtools'
        );
      }
    }

    var expectedFeatures = [
      // shims
      Array.isArray,
      Array.prototype.every,
      Array.prototype.forEach,
      Array.prototype.indexOf,
      Array.prototype.map,
      Date.now,
      Function.prototype.bind,
      Object.keys,
      String.prototype.split,
      String.prototype.trim,

      // shams
      Object.create,
      Object.freeze
    ];

    for (var i = 0; i < expectedFeatures.length; i++) {
      if (!expectedFeatures[i]) {
        console.error(
          'One or more ES5 shim/shams expected by React are not available: ' +
          'http://fb.me/react-warning-polyfills'
        );
        break;
      }
    }
  }
}

React.version = '0.13.0';

module.exports = React;
