import type { FC, JSX } from 'react';
import { useCallback, useEffect, useRef } from 'react';
import dynamic from 'next/dynamic';
import type { IPageToDeleteWithMeta, IPageToRenameWithMeta } from '@growi/core';
import { getIdStringForRef } from '@growi/core';
import { useTranslation } from 'next-i18next';
import { DropdownItem } from 'reactstrap';
import { debounce } from 'throttle-debounce';

import type {
  AdditionalMenuItemsRendererProps,
  ForceHideMenuItems,
} from '~/client/components/Common/Dropdown/PageItemControl';
import type { RevisionLoaderProps } from '~/client/components/Page/RevisionLoader';
import { watchRenderingAndReScroll } from '~/client/hooks/use-content-auto-scroll/watch-rendering-and-rescroll';
import { exportAsMarkdown } from '~/client/services/page-operation';
import { scrollWithinContainer } from '~/client/util/smooth-scroll';
import { toastSuccess } from '~/client/util/toastr';
import { PagePathNav } from '~/components/Common/PagePathNav';
import type { IPageWithSearchMeta } from '~/interfaces/search';
import type {
  OnDeletedFunction,
  OnDuplicatedFunction,
  OnRenamedFunction,
} from '~/interfaces/ui';
import { useShouldExpandContent } from '~/services/layout/use-should-expand-content';
import { useCurrentUser } from '~/states/global';
import { usePageDeleteModalActions } from '~/states/ui/modal/page-delete';
import { usePageDuplicateModalActions } from '~/states/ui/modal/page-duplicate';
import { usePageRenameModalActions } from '~/states/ui/modal/page-rename';
import {
  mutatePageList,
  mutatePageTree,
  mutateRecentlyUpdated,
} from '~/stores/page-listing';
import { useSearchResultOptions } from '~/stores/renderer';
import { mutateSearching } from '~/stores/search';

import styles from './SearchResultContent.module.scss';

const moduleClass = styles['search-result-content'];
const _fluidLayoutClass = styles['fluid-layout'];

const PageControls = dynamic(
  () =>
    import('~/client/components/PageControls').then((mod) => mod.PageControls),
  { ssr: false },
);
const RevisionLoader = dynamic<RevisionLoaderProps>(
  () =>
    import('~/client/components/Page/RevisionLoader').then(
      (mod) => mod.RevisionLoader,
    ),
  { ssr: false },
);
const PageComment = dynamic(
  () =>
    import('~/client/components/PageComment').then((mod) => mod.PageComment),
  { ssr: false },
);
const PageContentFooter = dynamic(
  () =>
    import('~/components/PageView/PageContentFooter').then(
      (mod) => mod.PageContentFooter,
    ),
  { ssr: false },
);

type AdditionalMenuItemsProps = AdditionalMenuItemsRendererProps & {
  pageId: string;
  revisionId: string;
};

const AdditionalMenuItems = (props: AdditionalMenuItemsProps): JSX.Element => {
  const { t } = useTranslation();

  const { pageId, revisionId } = props;

  return (
    // Export markdown
    <DropdownItem
      onClick={() => exportAsMarkdown(pageId, revisionId, 'md')}
      className="grw-page-control-dropdown-item"
    >
      <span className="material-symbols-outlined me-1 grw-page-control-dropdown-icon">
        cloud_download
      </span>
      {t('page_export.export_page_markdown')}
    </DropdownItem>
  );
};

const SCROLL_OFFSET_TOP = 30;
const MUTATION_OBSERVER_CONFIG = { childList: true, subtree: true }; // omit 'subtree: true'

type Props = {
  pageWithMeta: IPageWithSearchMeta;
  highlightKeywords?: string[];
  showPageControlDropdown?: boolean;
  forceHideMenuItems?: ForceHideMenuItems;
};

const scrollToTargetWithinContainer = (
  target: HTMLElement,
  container: HTMLElement,
): void => {
  const distance =
    target.getBoundingClientRect().top -
    container.getBoundingClientRect().top -
    SCROLL_OFFSET_TOP;
  scrollWithinContainer(container, distance);
};

const scrollToFirstHighlightedKeyword = (scrollElement: HTMLElement): void => {
  // use querySelector to intentionally get the first element found
  const toElem = scrollElement.querySelector(
    '.highlighted-keyword',
  ) as HTMLElement | null;
  if (toElem == null) return;
  scrollToTargetWithinContainer(toElem, scrollElement);
};
const scrollToFirstHighlightedKeywordDebounced = debounce(
  500,
  scrollToFirstHighlightedKeyword,
);

export const SearchResultContent: FC<Props> = (props: Props) => {
  const scrollElementRef = useRef<HTMLDivElement | null>(null);

  const { pageWithMeta } = props;
  const page = pageWithMeta.data;

  // ***************************  Keyword Scroll  ***************************
  // biome-ignore lint/correctness/useExhaustiveDependencies: page._id is a trigger dep: re-run this effect when the selected page changes
  useEffect(() => {
    const scrollElement = scrollElementRef.current;

    if (scrollElement == null) return;

    const scrollToKeyword = (): boolean => {
      const toElem = scrollElement.querySelector(
        '.highlighted-keyword',
      ) as HTMLElement | null;
      if (toElem == null) return false;
      scrollToTargetWithinContainer(toElem, scrollElement);
      return true;
    };

    const observer = new MutationObserver(() => {
      scrollToFirstHighlightedKeywordDebounced(scrollElement);
    });
    observer.observe(scrollElement, MUTATION_OBSERVER_CONFIG);

    // Re-scroll to keyword after async renderers (drawio/mermaid) cause layout shifts
    const cleanupWatch = watchRenderingAndReScroll(
      scrollElement,
      scrollToKeyword,
    );
    return cleanupWatch;
  }, [page._id]);
  // *******************************  end  *******************************

  const { highlightKeywords, showPageControlDropdown, forceHideMenuItems } =
    props;

  const { t } = useTranslation();
  const { open: openDuplicateModal } = usePageDuplicateModalActions();
  const { open: openRenameModal } = usePageRenameModalActions();
  const { open: openDeleteModal } = usePageDeleteModalActions();
  const { data: rendererOptions } = useSearchResultOptions(
    pageWithMeta.data.path,
    highlightKeywords,
  );
  const currentUser = useCurrentUser();

  const shouldExpandContent = useShouldExpandContent(page);

  const duplicateItemClickedHandler = useCallback(
    async (pageToDuplicate) => {
      const duplicatedHandler: OnDuplicatedFunction = (fromPath, _toPath) => {
        toastSuccess(t('duplicated_pages', { fromPath }));

        mutatePageTree();
        mutateRecentlyUpdated();
        mutateSearching();
        mutatePageList();
      };
      openDuplicateModal(pageToDuplicate, { onDuplicated: duplicatedHandler });
    },
    [openDuplicateModal, t],
  );

  const renameItemClickedHandler = useCallback(
    (pageToRename: IPageToRenameWithMeta) => {
      const renamedHandler: OnRenamedFunction = (path) => {
        toastSuccess(t('renamed_pages', { path }));

        mutatePageTree();
        mutateRecentlyUpdated();
        mutateSearching();
        mutatePageList();
      };
      openRenameModal(pageToRename, { onRenamed: renamedHandler });
    },
    [openRenameModal, t],
  );

  const onDeletedHandler: OnDeletedFunction = useCallback(
    (pathOrPathsToDelete, isRecursively, isCompletely) => {
      if (typeof pathOrPathsToDelete !== 'string') {
        return;
      }
      const path = pathOrPathsToDelete;

      if (isCompletely) {
        toastSuccess(t('deleted_pages_completely', { path }));
      } else {
        toastSuccess(t('deleted_pages', { path }));
      }
      mutatePageTree();
      mutateRecentlyUpdated();
      mutateSearching();
      mutatePageList();
    },
    [t],
  );

  const deleteItemClickedHandler = useCallback(
    (pageToDelete: IPageToDeleteWithMeta) => {
      openDeleteModal([pageToDelete], { onDeleted: onDeletedHandler });
    },
    [onDeletedHandler, openDeleteModal],
  );

  const RightComponent = useCallback(() => {
    if (page == null) {
      return <></>;
    }

    const revisionId =
      page.revision != null ? getIdStringForRef(page.revision) : null;
    const additionalMenuItemRenderer =
      revisionId != null
        ? (props) => (
            <AdditionalMenuItems
              {...props}
              pageId={page._id}
              revisionId={revisionId}
            />
          )
        : undefined;

    return (
      <div className="d-flex flex-column flex-row-reverse flex px-2 py-1">
        <PageControls
          pageId={page._id}
          revisionId={revisionId}
          path={page.path}
          expandContentWidth={shouldExpandContent}
          showPageControlDropdown={showPageControlDropdown}
          forceHideMenuItems={forceHideMenuItems}
          additionalMenuItemRenderer={additionalMenuItemRenderer}
          onClickDuplicateMenuItem={duplicateItemClickedHandler}
          onClickRenameMenuItem={renameItemClickedHandler}
          onClickDeleteMenuItem={deleteItemClickedHandler}
        />
      </div>
    );
  }, [
    page,
    shouldExpandContent,
    showPageControlDropdown,
    forceHideMenuItems,
    duplicateItemClickedHandler,
    renameItemClickedHandler,
    deleteItemClickedHandler,
  ]);

  const fluidLayoutClass = shouldExpandContent ? _fluidLayoutClass : '';

  return (
    <div
      key={page._id}
      data-testid="search-result-content"
      className={`dynamic-layout-root ${moduleClass} ${fluidLayoutClass}`}
    >
      <RightComponent />

      <div className="container-lg grw-container-convertible pt-2 pb-2">
        <PagePathNav
          pageId={page._id}
          pagePath={page.path}
          isWipPage={page.wip}
          formerLinkClassName="small"
          latterLinkClassName="fs-3 text-truncate"
        />
      </div>

      <div
        id="search-result-content-body-container"
        ref={scrollElementRef}
        className="search-result-content-body-container container-lg grw-container-convertible overflow-y-scroll"
      >
        {page.revision != null && rendererOptions != null && (
          <RevisionLoader
            rendererOptions={rendererOptions}
            pageId={page._id}
            revisionId={page.revision}
          />
        )}
        {page.revision != null && (
          <PageComment
            rendererOptions={rendererOptions}
            pageId={page._id}
            pagePath={page.path}
            revision={page.revision}
            currentUser={currentUser}
            isReadOnly
          />
        )}

        <PageContentFooter page={page} />
      </div>
    </div>
  );
};