import React, { useCallback } from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { Nullable } from 'tsdef';

import { ChonkyActions } from '../../action-definitions/index';
import { reduxActions } from '../../redux/reducers';
import { selectContextMenuMounted } from '../../redux/selectors';
import { thunkRequestFileAction } from '../../redux/thunks/dispatchers.thunks';
import { ChonkyDispatch } from '../../types/redux.types';
import { findElementAmongAncestors } from '../../util/helpers';
import { useInstanceVariable } from '../../util/hooks-helpers';

export const findClosestChonkyFileId = (element: HTMLElement | any): Nullable<string> => {
  const fileEntryWrapperDiv = findElementAmongAncestors(
    element,
    (element: any) =>
      element.tagName && element.tagName.toLowerCase() === 'div' && element.dataset && element.dataset.chonkyFileId,
  );
  return fileEntryWrapperDiv ? fileEntryWrapperDiv.dataset.chonkyFileId! : null;
};

export const useContextMenuTrigger = () => {
  const dispatch: ChonkyDispatch = useDispatch();
  const contextMenuMountedRef = useInstanceVariable(useSelector(selectContextMenuMounted));
  return useCallback(
    (event: React.MouseEvent<HTMLDivElement>) => {
      // Use default browser context menu when Chonky context menu component
      // is not mounted.
      if (!contextMenuMountedRef.current) return;
      // Users can use Alt+Right Click to bring up browser's default
      // context menu instead of Chonky's context menu.
      if (event.altKey) return;

      event.preventDefault();
      event.stopPropagation();

      const triggerFileId = findClosestChonkyFileId(event.target);
      dispatch(
        thunkRequestFileAction(ChonkyActions.OpenFileContextMenu, {
          clientX: event.clientX,
          clientY: event.clientY,
          triggerFileId,
        }),
      );
    },
    [contextMenuMountedRef, dispatch],
  );
};

export const useContextMenuDismisser = () => {
  const dispatch: ChonkyDispatch = useDispatch();
  return useCallback(() => dispatch(reduxActions.hideContextMenu()), [dispatch]);
};