weseek__growi/apps/app/src/components/Sidebar/PageTree/PageTreeItem.tsx

import React, {
  useCallback, useState, FC,
} from 'react';

import nodePath from 'path';

import { pagePathUtils } from '@growi/core';
import { useTranslation } from 'next-i18next';
import { useDrag, useDrop } from 'react-dnd';

import { apiv3Put } from '~/client/util/apiv3-client';
import { toastWarning, toastError } from '~/client/util/toastr';
import { IPageHasId } from '~/interfaces/page';
import { mutatePageTree, useSWRxPageChildren } from '~/stores/page-listing';
import loggerFactory from '~/utils/logger';


import { ItemNode } from './ItemNode';
import SimpleItem, { SimpleItemProps } from './SimpleItem';

const logger = loggerFactory('growi:cli:Item');

type Optional = 'itemRef' | 'itemClass' | 'mainClassName';

type PageTreeItemProps = Omit<SimpleItemProps, Optional> & {key};

export const PageTreeItem: FC<PageTreeItemProps> = (props: PageTreeItemProps) => {
  const getNewPathAfterMoved = (droppedPagePath: string, newParentPagePath: string): string => {
    const pageTitle = nodePath.basename(droppedPagePath);
    return nodePath.join(newParentPagePath, pageTitle);
  };

  const isDroppable = (fromPage?: Partial<IPageHasId>, newParentPage?: Partial<IPageHasId>, printLog = false): boolean => {
    if (fromPage == null || newParentPage == null || fromPage.path == null || newParentPage.path == null) {
      if (printLog) {
        logger.warn('Any of page, page.path or droppedPage.path is null');
      }
      return false;
    }

    const newPathAfterMoved = getNewPathAfterMoved(fromPage.path, newParentPage.path);
    return pagePathUtils.canMoveByPath(fromPage.path, newPathAfterMoved) && !pagePathUtils.isUsersTopPage(newParentPage.path);
  };

  const { t } = useTranslation();
  const {
    itemNode, isOpen: _isOpen = false, onRenamed,
  } = props;
  const { page } = itemNode;
  const [isOpen, setIsOpen] = useState(_isOpen);
  const [shouldHide, setShouldHide] = useState(false);
  const { mutate: mutateChildren } = useSWRxPageChildren(isOpen ? page._id : null);

  const displayDroppedItemByPageId = useCallback((pageId) => {
    const target = document.getElementById(`pagetree-item-${pageId}`);
    if (target == null) {
      return;
    }
    //   // wait 500ms to avoid removing before d-none is set by useDrag end() callback
    setTimeout(() => {
      target.classList.remove('d-none');
    }, 500);
  }, []);

  const [, drag] = useDrag({
    type: 'PAGE_TREE',
    item: { page },
    canDrag: () => {
      if (page.path == null) {
        return false;
      }
      return !pagePathUtils.isUsersProtectedPages(page.path);
    },
    end: (item, monitor) => {
      // in order to set d-none to dropped Item
      const dropResult = monitor.getDropResult();
      if (dropResult != null) {
        setShouldHide(true);
      }
    },
    collect: monitor => ({
      isDragging: monitor.isDragging(),
      canDrag: monitor.canDrag(),
    }),
  });

  const pageItemDropHandler = async(item: ItemNode) => {
    const { page: droppedPage } = item;
    if (!isDroppable(droppedPage, page, true)) {
      return;
    }
    if (droppedPage.path == null || page.path == null) {
      return;
    }
    const newPagePath = getNewPathAfterMoved(droppedPage.path, page.path);
    try {
      await apiv3Put('/pages/rename', {
        pageId: droppedPage._id,
        revisionId: droppedPage.revision,
        newPagePath,
        isRenameRedirect: false,
        updateMetadata: true,
      });
      await mutatePageTree();
      await mutateChildren();
      if (onRenamed != null) {
        onRenamed(page.path, newPagePath);
      }
      // force open
      setIsOpen(true);
    }
    catch (err) {
      // display the dropped item
      displayDroppedItemByPageId(droppedPage._id);
      if (err.code === 'operation__blocked') {
        toastWarning(t('pagetree.you_cannot_move_this_page_now'));
      }
      else {
        toastError(t('pagetree.something_went_wrong_with_moving_page'));
      }
    }
  };

  const [{ isOver }, drop] = useDrop<ItemNode, Promise<void>, { isOver: boolean }>(
    () => ({
      accept: 'PAGE_TREE',
      drop: pageItemDropHandler,
      hover: (item, monitor) => {
        // when a drag item is overlapped more than 1 sec, the drop target item will be opened.
        if (monitor.isOver()) {
          setTimeout(() => {
            if (monitor.isOver()) {
              setIsOpen(true);
            }
          }, 600);
        }
      },
      canDrop: (item) => {
        const { page: droppedPage } = item;
        return isDroppable(droppedPage, page);
      },
      collect: monitor => ({
        isOver: monitor.isOver(),
      }),
    }),
    [page],
  );

  const itemRef = (c) => { drag(c); drop(c) };

  const mainClassName = `${isOver ? 'grw-pagetree-is-over' : ''} ${shouldHide ? 'd-none' : ''}`;

  return (
    <SimpleItem
      key={props.key}
      targetPathOrId={props.targetPathOrId}
      itemNode={props.itemNode}
      isOpen
      isEnableActions={props.isEnableActions}
      isReadOnlyUser={props.isReadOnlyUser}
      onRenamed={props.onRenamed}
      onClickDuplicateMenuItem={props.onClickDuplicateMenuItem}
      onClickDeleteMenuItem={props.onClickDeleteMenuItem}
      itemRef={itemRef}
      itemClass={PageTreeItem}
      mainClassName={mainClassName}
    />
  );
};