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function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

function _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }

function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }

import * as React from 'react';
import { memo } from 'react';
import { DndContext, createDndContext } from './DndContext';
var refCount = 0;
/**
 * A React component that provides the React-DnD context
 */

export var DndProvider = memo(function (_ref) {
  var children = _ref.children,
      props = _objectWithoutProperties(_ref, ["children"]);

  var _getDndContextValue = getDndContextValue(props),
      _getDndContextValue2 = _slicedToArray(_getDndContextValue, 2),
      manager = _getDndContextValue2[0],
      isGlobalInstance = _getDndContextValue2[1]; // memoized from props

  /**
   * If the global context was used to store the DND context
   * then where theres no more references to it we should
   * clean it up to avoid memory leaks
   */


  React.useEffect(function () {
    if (isGlobalInstance) {
      refCount++;
    }

    return function () {
      if (isGlobalInstance) {
        refCount--;

        if (refCount === 0) {
          var context = getGlobalContext();
          context[instanceSymbol] = null;
        }
      }
    };
  }, []);
  return React.createElement(DndContext.Provider, {
    value: manager
  }, children);
});
DndProvider.displayName = 'DndProvider';

function getDndContextValue(props) {
  if ('manager' in props) {
    var _manager = {
      dragDropManager: props.manager
    };
    return [_manager, false];
  }

  var manager = createSingletonDndContext(props.backend, props.context, props.options, props.debugMode);
  var isGlobalInstance = !props.context;
  return [manager, isGlobalInstance];
}

var instanceSymbol = Symbol.for('__REACT_DND_CONTEXT_INSTANCE__');

function createSingletonDndContext(backend) {
  var context = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : getGlobalContext();
  var options = arguments.length > 2 ? arguments[2] : undefined;
  var debugMode = arguments.length > 3 ? arguments[3] : undefined;
  var ctx = context;

  if (!ctx[instanceSymbol]) {
    ctx[instanceSymbol] = createDndContext(backend, context, options, debugMode);
  }

  return ctx[instanceSymbol];
}

function getGlobalContext() {
  return typeof global !== 'undefined' ? global : window;
}