RocketChat/Rocket.Chat

import type { ILivechatDepartment, IOmnichannelBusinessUnit } from '@rocket.chat/core-typings';
import { useTranslation, useEndpoint } from '@rocket.chat/ui-contexts';
import { useCallback, useState } from 'react';

import { useScrollableRecordList } from '../../hooks/lists/useScrollableRecordList';
import { useComponentDidUpdate } from '../../hooks/useComponentDidUpdate';
import { RecordList } from '../../lib/lists/RecordList';

type DepartmentsListOptions = {
    unitId?: IOmnichannelBusinessUnit['_id'];
    filter: string;
};

export const useDepartmentsByUnitsList = (
    options: DepartmentsListOptions,
): {
    itemsList: RecordList<ILivechatDepartment>;
    initialItemCount: number;
    reload: () => void;
    loadMoreItems: (start: number, end: number) => void;
} => {
    const t = useTranslation();
    const [itemsList, setItemsList] = useState(() => new RecordList<ILivechatDepartment>());
    const reload = useCallback(() => setItemsList(new RecordList<ILivechatDepartment>()), []);

    const getDepartments = useEndpoint('GET', '/v1/livechat/units/:unitId/departments/available', { unitId: options.unitId || 'none' });

    useComponentDidUpdate(() => {
        options && reload();
    }, [options, reload]);

    const fetchData = useCallback(
        async (start, end) => {
            const { departments, total } = await getDepartments({
                text: options.filter,
                offset: start,
                count: end + start,
            });

            return {
                items: departments.map(({ _id, name, _updatedAt, ...department }) => {
                    return {
                        ...department,
                        _id,
                        name: department.archived ? `${name} [${t('Archived')}]` : name,
                        label: name,
                        value: _id,
                    };
                }),
                itemCount: total,
            };
        },
        [getDepartments, options.filter, t],
    );

    const { loadMoreItems, initialItemCount } = useScrollableRecordList(itemsList, fetchData, 25);

    return {
        reload,
        itemsList,
        loadMoreItems,
        initialItemCount,
    };
};