"use strict";

exports.__esModule = true;
exports.default = createResponderEvent;

var _getBoundingClientRect = _interopRequireDefault(require("../../modules/getBoundingClientRect"));

var _ResponderTouchHistoryStore = _interopRequireDefault(require("./ResponderTouchHistoryStore"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) Nicolas Gallagher
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * 
 */
var emptyFunction = function emptyFunction() {};

var emptyObject = {};
var emptyArray = [];
/**
 * Safari produces very large identifiers that would cause the `touchBank` array
 * length to be so large as to crash the browser, if not normalized like this.
 * In the future the `touchBank` should use an object/map instead.
 */

function normalizeIdentifier(identifier) {
  return identifier > 20 ? identifier % 20 : identifier;
}
/**
 * Converts a native DOM event to a ResponderEvent.
 * Mouse events are transformed into fake touch events.
 */


function createResponderEvent(domEvent) {
  var rect;
  var propagationWasStopped = false;
  var changedTouches;
  var touches;
  var domEventChangedTouches = domEvent.changedTouches;
  var domEventType = domEvent.type;
  var metaKey = domEvent.metaKey === true;
  var shiftKey = domEvent.shiftKey === true;
  var force = domEventChangedTouches && domEventChangedTouches[0].force || 0;
  var identifier = normalizeIdentifier(domEventChangedTouches && domEventChangedTouches[0].identifier || 0);
  var clientX = domEventChangedTouches && domEventChangedTouches[0].clientX || domEvent.clientX;
  var clientY = domEventChangedTouches && domEventChangedTouches[0].clientY || domEvent.clientY;
  var pageX = domEventChangedTouches && domEventChangedTouches[0].pageX || domEvent.pageX;
  var pageY = domEventChangedTouches && domEventChangedTouches[0].pageY || domEvent.pageY;
  var preventDefault = typeof domEvent.preventDefault === 'function' ? domEvent.preventDefault.bind(domEvent) : emptyFunction;
  var timestamp = domEvent.timeStamp;

  function normalizeTouches(touches) {
    return Array.prototype.slice.call(touches).map(function (touch) {
      return {
        force: touch.force,
        identifier: normalizeIdentifier(touch.identifier),

        get locationX() {
          return locationX(touch.clientX);
        },

        get locationY() {
          return locationY(touch.clientY);
        },

        pageX: touch.pageX,
        pageY: touch.pageY,
        target: touch.target,
        timestamp: timestamp
      };
    });
  }

  if (domEventChangedTouches != null) {
    changedTouches = normalizeTouches(domEventChangedTouches);
    touches = normalizeTouches(domEvent.touches);
  } else {
    var emulatedTouches = [{
      force: force,
      identifier: identifier,

      get locationX() {
        return locationX(clientX);
      },

      get locationY() {
        return locationY(clientY);
      },

      pageX: pageX,
      pageY: pageY,
      target: domEvent.target,
      timestamp: timestamp
    }];
    changedTouches = emulatedTouches;
    touches = domEventType === 'mouseup' || domEventType === 'dragstart' ? emptyArray : emulatedTouches;
  }

  var responderEvent = {
    bubbles: true,
    cancelable: true,
    // `currentTarget` is set before dispatch
    currentTarget: null,
    defaultPrevented: domEvent.defaultPrevented,
    dispatchConfig: emptyObject,
    eventPhase: domEvent.eventPhase,
    isDefaultPrevented: function isDefaultPrevented() {
      return domEvent.defaultPrevented;
    },
    isPropagationStopped: function isPropagationStopped() {
      return propagationWasStopped;
    },
    isTrusted: domEvent.isTrusted,
    nativeEvent: {
      altKey: false,
      ctrlKey: false,
      metaKey: metaKey,
      shiftKey: shiftKey,
      changedTouches: changedTouches,
      force: force,
      identifier: identifier,

      get locationX() {
        return locationX(clientX);
      },

      get locationY() {
        return locationY(clientY);
      },

      pageX: pageX,
      pageY: pageY,
      target: domEvent.target,
      timestamp: timestamp,
      touches: touches,
      type: domEventType
    },
    persist: emptyFunction,
    preventDefault: preventDefault,
    stopPropagation: function stopPropagation() {
      propagationWasStopped = true;
    },
    target: domEvent.target,
    timeStamp: timestamp,
    touchHistory: _ResponderTouchHistoryStore.default.touchHistory
  }; // Using getters and functions serves two purposes:
  // 1) The value of `currentTarget` is not initially available.
  // 2) Measuring the clientRect may cause layout jank and should only be done on-demand.

  function locationX(x) {
    rect = rect || (0, _getBoundingClientRect.default)(responderEvent.currentTarget);

    if (rect) {
      return x - rect.left;
    }
  }

  function locationY(y) {
    rect = rect || (0, _getBoundingClientRect.default)(responderEvent.currentTarget);

    if (rect) {
      return y - rect.top;
    }
  }

  return responderEvent;
}

module.exports = exports.default;