import React, {
  type JSX,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react';
import { LoadingSpinner } from '@growi/ui/dist/components';
import { useAtomValue } from 'jotai';
import { useTranslation } from 'next-i18next';
import {
  DropdownItem,
  DropdownMenu,
  DropdownToggle,
  Modal,
  ModalBody,
  ModalFooter,
  ModalHeader,
  UncontrolledButtonDropdown,
} from 'reactstrap';

import { MenuItemType } from '~/client/components/Common/Dropdown/PageItemControl';
import PaginationWrapper from '~/client/components/PaginationWrapper';
import { PrivateLegacyPagesMigrationModal } from '~/client/components/PrivateLegacyPagesMigrationModal';
import type {
  ISelectableAll,
  ISelectableAndIndeterminatable,
} from '~/client/interfaces/selectable-all';
import { apiv3Post } from '~/client/util/apiv3-client';
import { toastError, toastSuccess } from '~/client/util/toastr';
import { V5ConversionErrCode } from '~/interfaces/errors/v5-conversion-error';
import type { V5MigrationStatus } from '~/interfaces/page-listing-results';
import type { IFormattedSearchResult } from '~/interfaces/search';
import type { PageMigrationErrorData } from '~/interfaces/websocket';
import { SocketEventName } from '~/interfaces/websocket';
import { useIsAdmin } from '~/states/context';
import { useSearchKeyword, useSetSearchKeyword } from '~/states/search';
import { disableUserPagesAtom } from '~/states/server-configurations';
import { useGlobalSocket } from '~/states/socket-io';
import type { ILegacyPrivatePage } from '~/states/ui/modal/private-legacy-pages-migration';
import { usePrivateLegacyPagesMigrationModalActions } from '~/states/ui/modal/private-legacy-pages-migration';
import {
  mutatePageTree,
  useSWRxV5MigrationStatus,
} from '~/stores/page-listing';
import { useSWRxSearch } from '~/stores/search';

import { OperateAllControl } from './SearchPage/OperateAllControl';
import SearchControl from './SearchPage/SearchControl';
import {
  type IReturnSelectedPageIds,
  SearchPageBase,
  usePageDeleteModalForBulkDeletion,
} from './SearchPage/SearchPageBase';

// TODO: replace with "customize:showPageLimitationS"
const INITIAL_PAGING_SIZE = 20;

const initQ = '/';

/**
 * SearchResultListHead
 */

type SearchResultListHeadProps = {
  searchResult: IFormattedSearchResult;
  offset: number;
  pagingSize: number;
  onPagingSizeChanged: (size: number) => void;
  migrationStatus?: V5MigrationStatus;
};

const SearchResultListHead = React.memo(
  (props: SearchResultListHeadProps): JSX.Element => {
    const { t } = useTranslation();

    const {
      searchResult,
      offset,
      pagingSize,
      onPagingSizeChanged,
      migrationStatus,
    } = props;

    if (migrationStatus == null) {
      return (
        <div className="mw-0 flex-grow-1 flex-basis-0 m-5 text-muted text-center">
          <LoadingSpinner className="me-1 fs-3" />
        </div>
      );
    }

    const { took, total, hitsCount } = searchResult.meta;
    const leftNum = offset + 1;
    const rightNum = offset + hitsCount;

    const isSuccess = migrationStatus.migratablePagesCount === 0;

    if (isSuccess) {
      return (
        <div
          className="card border-success mt-3"
          data-testid="search-result-private-legacy-pages"
        >
          <div className="card-body">
            <h2 className="card-title text-success">
              {t('private_legacy_pages.nopages_title')}
            </h2>
            <p className="card-text">
              {t('private_legacy_pages.nopages_desc1')}
              <br />
              <span
                // biome-ignore lint/security/noDangerouslySetInnerHtml: ignore
                dangerouslySetInnerHTML={{
                  __html: t('private_legacy_pages.detail_info'),
                }}
              ></span>
            </p>
          </div>
        </div>
      );
    }

    return (
      <>
        <div className="d-flex align-items-center justify-content-between">
          <div className="text-nowrap">
            {t('search_result.result_meta')}
            <span className="ms-3">
              {`${leftNum}-${rightNum}`} / {total}
            </span>
            {took != null && (
              <span className="ms-3 text-muted">({took}ms)</span>
            )}
          </div>
          <div className="input-group flex-nowrap search-result-select-group ms-auto d-md-flex d-none">
            <div>
              <label
                className="form-label input-group-text text-muted"
                htmlFor="inputGroupSelect01"
              >
                {t('search_result.number_of_list_to_display')}
              </label>
            </div>
            <select
              defaultValue={pagingSize}
              className="form-select"
              id="inputGroupSelect01"
              onChange={(e) => onPagingSizeChanged(Number(e.target.value))}
            >
              {[20, 50, 100, 200].map((limit) => {
                return (
                  <option key={limit} value={limit}>
                    {limit} {t('search_result.page_number_unit')}
                  </option>
                );
              })}
            </select>
          </div>
        </div>
        <div className="card border-warning mt-3">
          <div className="card-body">
            <h2 className="card-title text-warning">
              {t('private_legacy_pages.alert_title')}
            </h2>
            <p className="card-text">
              {t('private_legacy_pages.alert_desc1', {
                delete_all_selected_page: t(
                  'search_result.delete_all_selected_page',
                ),
              })}
              <br />
              <span
                // biome-ignore lint/security/noDangerouslySetInnerHtml: ignore
                dangerouslySetInnerHTML={{
                  __html: t('private_legacy_pages.detail_info'),
                }}
              ></span>
            </p>
          </div>
        </div>
      </>
    );
  },
);

SearchResultListHead.displayName = 'SearchResultListHead';

/*
 * ConvertByPathModal
 */
type ConvertByPathModalProps = {
  isOpen: boolean;
  close?: () => void;
  onSubmit?: (convertPath: string) => Promise<void> | void;
};
const ConvertByPathModal = React.memo(
  (props: ConvertByPathModalProps): JSX.Element => {
    const { t } = useTranslation();

    const [currentInput, setInput] = useState<string>('');
    const [checked, setChecked] = useState<boolean>(false);

    useEffect(() => {
      setChecked(false);
    }, []);

    return (
      <Modal size="lg" isOpen={props.isOpen} toggle={props.close}>
        <ModalHeader tag="h4" toggle={props.close}>
          {t('private_legacy_pages.by_path_modal.title')}
        </ModalHeader>
        <ModalBody>
          <p>{t('private_legacy_pages.by_path_modal.description')}</p>
          <input
            type="text"
            className="form-control"
            placeholder="/"
            value={currentInput}
            onChange={(e) => setInput(e.target.value)}
          />
          <div className="alert alert-danger mt-3" role="alert">
            {t('private_legacy_pages.by_path_modal.alert')}
          </div>
        </ModalBody>
        <ModalFooter>
          <div className="form-check">
            <input
              className="form-check-input"
              type="checkbox"
              id="understoodCheckbox"
              onChange={(e) => setChecked(e.target.checked)}
            />
            <label
              className="form-label form-check-label"
              htmlFor="understoodCheckbox"
            >
              {t('private_legacy_pages.by_path_modal.checkbox_label')}
            </label>
          </div>
          <button
            type="button"
            className="btn btn-primary"
            disabled={!checked}
            onClick={() => props.onSubmit?.(currentInput)}
          >
            <span className="material-symbols-outlined" aria-hidden="true">
              refresh
            </span>
            {t('private_legacy_pages.by_path_modal.button_label')}
          </button>
        </ModalFooter>
      </Modal>
    );
  },
);

ConvertByPathModal.displayName = 'ConvertByPathModal';

/**
 * LegacyPage
 */

const PrivateLegacyPages = (): JSX.Element => {
  const { t } = useTranslation();

  const isAdmin = useIsAdmin();

  const keyword = useSearchKeyword();
  const setSearchKeyword = useSetSearchKeyword('/_private-legacy-pages');

  const disableUserPages = useAtomValue(disableUserPagesAtom);

  const [offset, setOffset] = useState<number>(0);
  const [limit, setLimit] = useState<number>(INITIAL_PAGING_SIZE);
  const [isOpenConvertModal, setOpenConvertModal] = useState<boolean>(false);

  const [isControlEnabled, setControlEnabled] = useState(false);

  const selectAllControlRef = useRef<ISelectableAndIndeterminatable | null>(
    null,
  );
  const searchPageBaseRef = useRef<
    (ISelectableAll & IReturnSelectedPageIds) | null
  >(null);

  // biome-ignore lint/correctness/useExhaustiveDependencies: only run on mount
  useEffect(() => {
    setSearchKeyword(initQ);
  }, []);

  const { data, conditions, mutate } = useSWRxSearch(
    keyword,
    'PrivateLegacyPages',
    {
      offset,
      limit,
      includeUserPages: true,
      includeTrashPages: false,
    },
  );

  const { data: migrationStatus, mutate: mutateMigrationStatus } =
    useSWRxV5MigrationStatus();

  const searchInvokedHandler = useCallback(
    (_keyword: string) => {
      mutateMigrationStatus();
      setSearchKeyword(_keyword);
      setOffset(0);
    },
    [mutateMigrationStatus, setSearchKeyword],
  );

  const { open: openModal, close: closeModal } =
    usePrivateLegacyPagesMigrationModalActions();
  const socket = useGlobalSocket();

  useEffect(() => {
    socket?.on(SocketEventName.PageMigrationSuccess, () => {
      toastSuccess(t('private_legacy_pages.toaster.page_migration_succeeded'));
    });

    socket?.on(
      SocketEventName.PageMigrationError,
      (data?: PageMigrationErrorData) => {
        if (data == null || data.paths.length === 0) {
          toastError(t('private_legacy_pages.toaster.page_migration_failed'));
        } else {
          const errorPaths =
            data.paths.length > 3
              ? `${data.paths.slice(0, 3).join(', ')}...`
              : data.paths.join(', ');
          toastError(
            t('private_legacy_pages.toaster.page_migration_failed_with_paths', {
              paths: errorPaths,
            }),
          );
        }
      },
    );

    return () => {
      socket?.off(SocketEventName.PageMigrationSuccess);
      socket?.off(SocketEventName.PageMigrationError);
    };
  }, [socket, t]);

  const selectAllCheckboxChangedHandler = useCallback((isChecked: boolean) => {
    const instance = searchPageBaseRef.current;

    if (instance == null) {
      return;
    }

    if (isChecked) {
      instance.selectAll();
      setControlEnabled(true);
    } else {
      instance.deselectAll();
      setControlEnabled(false);
    }
  }, []);

  const selectedPagesByCheckboxesChangedHandler = useCallback(
    (selectedCount: number, totalCount: number) => {
      const instance = selectAllControlRef.current;

      if (instance == null) {
        return;
      }

      if (selectedCount === 0) {
        instance.deselect();
        setControlEnabled(false);
      } else if (selectedCount === totalCount) {
        instance.select();
        setControlEnabled(true);
      } else {
        instance.setIndeterminate();
        setControlEnabled(true);
      }
    },
    [],
  );

  // for bulk deletion
  const deleteAllButtonClickedHandler = usePageDeleteModalForBulkDeletion(
    data,
    searchPageBaseRef,
    () => mutate(),
  );

  const convertMenuItemClickedHandler = useCallback(() => {
    if (data == null) {
      return;
    }

    const instance = searchPageBaseRef.current;
    if (instance == null || instance.getSelectedPageIds == null) {
      return;
    }

    const selectedPageIds = instance.getSelectedPageIds();

    if (selectedPageIds.size === 0) {
      return;
    }

    const selectedPages = data.data
      .filter((pageWithMeta) => selectedPageIds.has(pageWithMeta.data._id))
      .map(
        (pageWithMeta) =>
          ({
            pageId: pageWithMeta.data._id,
            path: pageWithMeta.data.path,
          }) as ILegacyPrivatePage,
      );

    openModal(selectedPages, () => {
      toastSuccess(t('Successfully requested'));
      closeModal();
      mutateMigrationStatus();
      mutate();
      mutatePageTree();
    });
  }, [data, openModal, t, closeModal, mutateMigrationStatus, mutate]);

  const pagingSizeChangedHandler = useCallback(
    (pagingSize: number) => {
      setOffset(0);
      setLimit(pagingSize);
      mutate();
    },
    [mutate],
  );

  const pagingNumberChangedHandler = useCallback(
    (activePage: number) => {
      setOffset((activePage - 1) * limit);
      mutate();
    },
    [limit, mutate],
  );

  const openConvertModalHandler = useCallback(() => {
    if (!isAdmin) {
      return;
    }
    setOpenConvertModal(true);
  }, [isAdmin]);

  const hitsCount = data?.meta.hitsCount;

  const renderOpenModalButton = useCallback(() => {
    return (
      <div className="d-flex ps-md-2">
        <button
          type="button"
          className="btn btn-light"
          onClick={() => openConvertModalHandler()}
        >
          {t('private_legacy_pages.input_path_to_convert')}
        </button>
      </div>
    );
  }, [t, openConvertModalHandler]);

  const extraControls = useMemo(() => {
    const isCheckboxDisabled = hitsCount === 0;

    return (
      <div className="d-flex align-items-center">
        <div className="d-flex">
          <OperateAllControl
            inputClassName="me-2"
            ref={selectAllControlRef}
            isCheckboxDisabled={isCheckboxDisabled}
            onCheckboxChanged={selectAllCheckboxChangedHandler}
          >
            <UncontrolledButtonDropdown>
              <DropdownToggle
                caret
                color="outline-primary"
                disabled={!isControlEnabled}
              >
                {t('private_legacy_pages.bulk_operation')}
              </DropdownToggle>
              <DropdownMenu>
                <DropdownItem onClick={convertMenuItemClickedHandler}>
                  <span className="material-symbols-outlined">refresh</span>
                  {t('private_legacy_pages.convert_all_selected_pages')}
                </DropdownItem>
                <DropdownItem onClick={deleteAllButtonClickedHandler}>
                  <span className="text-danger">
                    <span className="material-symbols-outlined">delete</span>
                    {t('search_result.delete_all_selected_page')}
                  </span>
                </DropdownItem>
              </DropdownMenu>
            </UncontrolledButtonDropdown>
          </OperateAllControl>
        </div>
        {isAdmin && renderOpenModalButton()}
      </div>
    );
  }, [
    convertMenuItemClickedHandler,
    deleteAllButtonClickedHandler,
    hitsCount,
    isAdmin,
    isControlEnabled,
    renderOpenModalButton,
    selectAllCheckboxChangedHandler,
    t,
  ]);

  const searchControl = useMemo(() => {
    return (
      <SearchControl
        disableUserPages={disableUserPages}
        isEnableSort={false}
        isEnableFilter={false}
        initialSearchConditions={{ keyword: initQ, limit: INITIAL_PAGING_SIZE }}
        onSearchInvoked={searchInvokedHandler}
        extraControls={extraControls}
      />
    );
  }, [searchInvokedHandler, extraControls, disableUserPages]);

  const searchResultListHead = useMemo(() => {
    if (data == null) {
      // biome-ignore lint/complexity/noUselessFragments: ignore
      return <></>;
    }
    return (
      <SearchResultListHead
        searchResult={data}
        offset={offset}
        pagingSize={limit}
        onPagingSizeChanged={pagingSizeChangedHandler}
        migrationStatus={migrationStatus}
      />
    );
  }, [data, limit, offset, pagingSizeChangedHandler, migrationStatus]);

  const searchPager = useMemo(() => {
    // when pager is not needed
    if (data == null || data.meta.hitsCount === data.meta.total) {
      // biome-ignore lint/complexity/noUselessFragments: ignore
      return <></>;
    }

    const { total } = data.meta;
    const { offset, limit } = conditions;

    return (
      <PaginationWrapper
        activePage={Math.floor(offset / limit) + 1}
        totalItemsCount={total}
        pagingLimit={limit}
        changePage={pagingNumberChangedHandler}
      />
    );
  }, [conditions, data, pagingNumberChangedHandler]);

  return (
    <>
      <SearchPageBase
        ref={searchPageBaseRef}
        pages={data?.data}
        onSelectedPagesByCheckboxesChanged={
          selectedPagesByCheckboxesChangedHandler
        }
        forceHideMenuItems={[
          MenuItemType.BOOKMARK,
          MenuItemType.RENAME,
          MenuItemType.DUPLICATE,
          MenuItemType.REVERT,
          MenuItemType.PATH_RECOVERY,
        ]}
        // Components
        searchControl={searchControl}
        searchResultListHead={searchResultListHead}
        searchPager={searchPager}
      />

      <PrivateLegacyPagesMigrationModal />
      <ConvertByPathModal
        isOpen={isOpenConvertModal}
        close={() => setOpenConvertModal(false)}
        onSubmit={async (convertPath: string) => {
          try {
            await apiv3Post<void>('/pages/convert-pages-by-path', {
              convertPath,
            });
            toastSuccess(t('private_legacy_pages.by_path_modal.success'));
            setOpenConvertModal(false);
            mutate();
            mutatePageTree();
          } catch (errs) {
            if (errs.length === 1) {
              switch (errs[0].code) {
                case V5ConversionErrCode.GRANT_INVALID:
                  toastError(
                    t('private_legacy_pages.by_path_modal.error_grant_invalid'),
                  );
                  break;
                case V5ConversionErrCode.PAGE_NOT_FOUND:
                  toastError(
                    t(
                      'private_legacy_pages.by_path_modal.error_page_not_found',
                    ),
                  );
                  break;
                case V5ConversionErrCode.DUPLICATE_PAGES_FOUND:
                  toastError(
                    t(
                      'private_legacy_pages.by_path_modal.error_duplicate_pages_found',
                    ),
                  );
                  break;
                default:
                  toastError(t('private_legacy_pages.by_path_modal.error'));
              }
            } else {
              toastError(t('private_legacy_pages.by_path_modal.error'));
            }
          }
        }}
      />
    </>
  );
};

export default PrivateLegacyPages;