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

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); }

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

import { useMemo } from 'react';
import { invariant } from '@react-dnd/invariant';
import { registerSource } from '../../common/registration';
import { useDragDropManager } from './useDragDropManager';
import { DragSourceMonitorImpl } from '../../common/DragSourceMonitorImpl';
import { SourceConnector } from '../../common/SourceConnector';
import { useIsomorphicLayoutEffect } from './useIsomorphicLayoutEffect';
export function useDragSourceMonitor() {
  var manager = useDragDropManager();
  var monitor = useMemo(function () {
    return new DragSourceMonitorImpl(manager);
  }, [manager]);
  var connector = useMemo(function () {
    return new SourceConnector(manager.getBackend());
  }, [manager]);
  return [monitor, connector];
}
export function useDragHandler(spec, monitor, connector) {
  var manager = useDragDropManager();
  var handler = useMemo(function () {
    return {
      beginDrag: function beginDrag() {
        var _spec$current = spec.current,
            begin = _spec$current.begin,
            item = _spec$current.item;

if (begin) {
          var beginResult = begin(monitor);
          invariant(beginResult == null || _typeof(beginResult) === 'object', 'dragSpec.begin() must either return an object, undefined, or null');
          return beginResult || item || {};
        }

return item || {};
      },
      canDrag: function canDrag() {
        if (typeof spec.current.canDrag === 'boolean') {
          return spec.current.canDrag;
        } else if (typeof spec.current.canDrag === 'function') {
          return spec.current.canDrag(monitor);
        } else {
          return true;
        }
      },
      isDragging: function isDragging(globalMonitor, target) {
        var isDragging = spec.current.isDragging;
        return isDragging ? isDragging(monitor) : target === globalMonitor.getSourceId();
      },
      endDrag: function endDrag() {
        var end = spec.current.end;

if (end) {
          end(monitor.getItem(), monitor);
        }

connector.reconnect();
      }
    };
  }, []);
  useIsomorphicLayoutEffect(function registerHandler() {
    var _registerSource = registerSource(spec.current.item.type, handler, manager),
        _registerSource2 = _slicedToArray(_registerSource, 2),
        handlerId = _registerSource2[0],
        unregister = _registerSource2[1];

monitor.receiveHandlerId(handlerId);
    connector.receiveHandlerId(handlerId);
    return unregister;
  }, []);
}