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

import { PageGrant, GroupType } from '@growi/core';
import { useTranslation } from 'react-i18next';
import {
  Modal, ModalHeader, ModalBody, ModalFooter,
} from 'reactstrap';

import { apiv3Put } from '~/client/util/apiv3-client';
import { toastError, toastSuccess } from '~/client/util/toastr';
import type { IPageGrantData } from '~/interfaces/page';
import type { PopulatedGrantedGroup, IRecordApplicableGrant, IResIsGrantNormalizedGrantData } from '~/interfaces/page-grant';
import { useCurrentUser } from '~/stores/context';
import { useSWRxApplicableGrant, useSWRxIsGrantNormalized, useSWRxCurrentPage } from '~/stores/page';

type ModalProps = {
  isOpen: boolean
  pageId: string
  dataApplicableGrant: IRecordApplicableGrant
  currentAndParentPageGrantData: IResIsGrantNormalizedGrantData
  close(): void
}

const FixPageGrantModal = (props: ModalProps): JSX.Element => {
  const { t } = useTranslation();

  const {
    isOpen, pageId, dataApplicableGrant, currentAndParentPageGrantData, close,
  } = props;

  const [selectedGrant, setSelectedGrant] = useState<PageGrant>(PageGrant.GRANT_RESTRICTED);

  const [isGroupSelectModalShown, setIsGroupSelectModalShown] = useState(false);
  const [selectedGroups, setSelectedGroups] = useState<PopulatedGrantedGroup[]>([]);

  // Alert message state
  const [shouldShowModalAlert, setShowModalAlert] = useState<boolean>(false);

  const applicableGroups = dataApplicableGrant[PageGrant.GRANT_USER_GROUP]?.applicableGroups;

  // Reset state when opened
  useEffect(() => {
    if (isOpen) {
      setSelectedGrant(PageGrant.GRANT_RESTRICTED);
      setSelectedGroups([]);
      setShowModalAlert(false);
    }
  }, [isOpen]);

  const groupListItemClickHandler = (group: PopulatedGrantedGroup) => {
    if (selectedGroups.find(g => g.item._id === group.item._id) != null) {
      setSelectedGroups(selectedGroups.filter(g => g.item._id !== group.item._id));
    }
    else {
      setSelectedGroups([...selectedGroups, group]);
    }
  };

  const submit = async() => {
    // Validate input values
    if (selectedGrant === PageGrant.GRANT_USER_GROUP && selectedGroups.length === 0) {
      setShowModalAlert(true);
      return;
    }

    close();

    try {
      await apiv3Put(`/page/${pageId}/grant`, {
        grant: selectedGrant,
        userRelatedGrantedGroups: selectedGroups.length !== 0 ? selectedGroups.map((g) => {
          return { item: g.item._id, type: g.type };
        }) : null,
      });

      toastSuccess(t('Successfully updated'));
    }
    catch (err) {
      toastError(t('Failed to update'));
    }
  };

  const getGrantLabel = useCallback((isForbidden: boolean, grantData?: IPageGrantData): string => {

    if (isForbidden) {
      return t('fix_page_grant.modal.grant_label.isForbidden');
    }

    if (grantData == null) {
      return t('fix_page_grant.modal.grant_label.isForbidden');
    }

    if (grantData.grant === 1) {
      return t('fix_page_grant.modal.grant_label.public');
    }

    if (grantData.grant === 4) {
      return t('fix_page_grant.modal.radio_btn.only_me');
    }

    if (grantData.grant === 5) {
      if (grantData.userRelatedGrantedGroups == null || grantData.userRelatedGrantedGroups.length === 0) {
        return t('fix_page_grant.modal.grant_label.isForbidden');
      }
      return `${t('fix_page_grant.modal.radio_btn.grant_group')} (${grantData.userRelatedGrantedGroups.map(g => g.name).join(', ')})`;
    }

    throw Error('cannot get grant label'); // this error can't be throwed
  }, [t]);

  const renderGrantDataLabel = useCallback(() => {
    const { isForbidden, currentPageGrant, parentPageGrant } = currentAndParentPageGrantData;

    const currentGrantLabel = getGrantLabel(false, currentPageGrant);
    const parentGrantLabel = getGrantLabel(isForbidden, parentPageGrant);

    return (
      <>
        <p className="mt-3">{ t('fix_page_grant.modal.grant_label.parentPageGrantLabel') + parentGrantLabel }</p>
        <p>{ t('fix_page_grant.modal.grant_label.currentPageGrantLabel') + currentGrantLabel }</p>
        {/* eslint-disable-next-line react/no-danger */}
        <p dangerouslySetInnerHTML={{ __html: t('fix_page_grant.modal.grant_label.docLink') }} />
      </>
    );
  }, [t, currentAndParentPageGrantData, getGrantLabel]);

  const renderModalBodyAndFooter = () => {
    const isGrantAvailable = Object.keys(dataApplicableGrant || {}).length > 0;

    if (!isGrantAvailable) {
      return (
        <p className="m-5">
          { t('fix_page_grant.modal.no_grant_available') }
        </p>
      );
    }

    return (
      <>
        <ModalBody>
          <div>
            {/* eslint-disable-next-line react/no-danger */}
            <p className="mb-2" dangerouslySetInnerHTML={{ __html: t('fix_page_grant.modal.need_to_fix_grant') }} />

            {/* grant data label */}
            {renderGrantDataLabel()}

            <div className="ms-2">
              <div className="form-check mb-3">
                <input
                  className="form-check-input"
                  name="grantRestricted"
                  id="grantRestricted"
                  type="radio"
                  disabled={!(PageGrant.GRANT_RESTRICTED in dataApplicableGrant)}
                  checked={selectedGrant === PageGrant.GRANT_RESTRICTED}
                  onChange={() => setSelectedGrant(PageGrant.GRANT_RESTRICTED)}
                />
                <label className="form-label form-check-label" htmlFor="grantRestricted">
                  { t('fix_page_grant.modal.radio_btn.restrected') }
                </label>
              </div>
              <div className="form-check mb-3">
                <input
                  className="form-check-input"
                  name="grantUser"
                  id="grantUser"
                  type="radio"
                  disabled={!(PageGrant.GRANT_OWNER in dataApplicableGrant)}
                  checked={selectedGrant === PageGrant.GRANT_OWNER}
                  onChange={() => setSelectedGrant(PageGrant.GRANT_OWNER)}
                />
                <label className="form-label form-check-label" htmlFor="grantUser">
                  { t('fix_page_grant.modal.radio_btn.only_me') }
                </label>
              </div>
              <div className="form-check d-flex mb-3">
                <input
                  className="form-check-input"
                  name="grantUserGroup"
                  id="grantUserGroup"
                  type="radio"
                  disabled={!(PageGrant.GRANT_USER_GROUP in dataApplicableGrant)}
                  checked={selectedGrant === PageGrant.GRANT_USER_GROUP}
                  onChange={() => setSelectedGrant(PageGrant.GRANT_USER_GROUP)}
                />
                <label className="form-label form-check-label" htmlFor="grantUserGroup">
                  { t('fix_page_grant.modal.radio_btn.grant_group') }
                </label>
                <div className="dropdown ms-2">
                  <button
                    type="button"
                    className="btn btn-secondary dropdown-toggle text-right w-100 border-0 shadow-none"
                    disabled={selectedGrant !== PageGrant.GRANT_USER_GROUP} // disable when its radio input is not selected
                    onClick={() => setIsGroupSelectModalShown(true)}
                  >
                    <span className="float-start ms-2">
                      {
                        selectedGroups.length === 0
                          ? t('fix_page_grant.modal.select_group_default_text')
                          : selectedGroups.map(g => g.item.name).join(', ')
                      }
                    </span>
                  </button>
                </div>
              </div>
              {
                shouldShowModalAlert && (
                  <p className="alert alert-warning">
                    {t('fix_page_grant.modal.alert_message')}
                  </p>
                )
              }
            </div>
          </div>
        </ModalBody>
        <ModalFooter>
          <button type="button" className="btn btn-primary" onClick={submit}>
            { t('fix_page_grant.modal.btn_label') }
          </button>
        </ModalFooter>
      </>
    );
  };

  return (
    <>
      <Modal size="lg" isOpen={isOpen} toggle={close}>
        <ModalHeader tag="h4" toggle={close} className="bg-primary text-light">
          { t('fix_page_grant.modal.title') }
        </ModalHeader>
        {renderModalBodyAndFooter()}
      </Modal>
      {applicableGroups != null && (
        <Modal
          isOpen={isGroupSelectModalShown}
          toggle={() => setIsGroupSelectModalShown(false)}
        >
          <ModalHeader tag="h4" toggle={() => setIsGroupSelectModalShown(false)} className="bg-purple text-light">
            {t('user_group.select_group')}
          </ModalHeader>
          <ModalBody>
            <>
              { applicableGroups.map((group) => {
                const groupIsGranted = selectedGroups?.find(g => g.item._id === group.item._id) != null;
                const activeClass = groupIsGranted ? 'active' : '';

                return (
                  <button
                    className={`btn btn-outline-primary w-100 d-flex justify-content-start mb-3 align-items-center p-3 ${activeClass}`}
                    type="button"
                    key={group.item._id}
                    onClick={() => groupListItemClickHandler(group)}
                  >
                    <span className="align-middle"><input type="checkbox" checked={groupIsGranted} /></span>
                    <h5 className="d-inline-block ml-3">{group.item.name}</h5>
                    {group.type === GroupType.externalUserGroup && <span className="ml-2 badge badge-pill badge-info">{group.item.provider}</span>}
                    {/* TODO: Replace <div className="small">(TBD) List group members</div> */}
                  </button>
                );
              }) }
              <button type="button" className="btn btn-primary mt-2 float-right" onClick={() => setIsGroupSelectModalShown(false)}>{t('Done')}</button>
            </>
          </ModalBody>
        </Modal>
      )}
    </>
  );
};

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

  const { data: currentUser } = useCurrentUser();
  const { data: pageData } = useSWRxCurrentPage();
  const hasParent = pageData != null ? pageData.parent != null : false;
  const pageId = pageData?._id;

  const [isOpen, setOpen] = useState<boolean>(false);

  const { data: dataIsGrantNormalized } = useSWRxIsGrantNormalized(currentUser != null ? pageId : null);
  const { data: dataApplicableGrant } = useSWRxApplicableGrant(currentUser != null ? pageId : null);

  // Dependencies
  if (pageData == null) {
    return <></>;
  }

  if (!hasParent) {
    return <></>;
  }
  if (dataIsGrantNormalized?.isGrantNormalized == null || dataIsGrantNormalized.isGrantNormalized) {
    return <></>;
  }

  return (
    <>
      <div className="alert alert-warning py-3 ps-4 d-flex flex-column flex-lg-row">
        <div className="flex-grow-1 d-flex align-items-center">
          <span className="material-symbols-outlined mx-1" aria-hidden="true">error</span>
          {t('fix_page_grant.alert.description')}
        </div>
        <div className="d-flex align-items-end align-items-lg-center">
          <button type="button" className="btn btn-info btn-sm rounded-pill px-3" onClick={() => setOpen(true)}>
            {t('fix_page_grant.alert.btn_label')}
          </button>
        </div>
      </div>

      {
        pageId != null && dataApplicableGrant != null && (
          <FixPageGrantModal
            isOpen={isOpen}
            pageId={pageId}
            dataApplicableGrant={dataApplicableGrant}
            currentAndParentPageGrantData={dataIsGrantNormalized.grantData}
            close={() => setOpen(false)}
          />
        )
      }
    </>
  );
};