shlinkio / shlink-web-client

import React from 'react';

import PropTypes from 'prop-types';

import { Pagination, PaginationItem, PaginationLink } from 'reactstrap';

import { range, max, min } from 'ramda';

import './SimplePaginator.scss';

const propTypes = {

  pagesCount: PropTypes.number.isRequired,

  currentPage: PropTypes.number.isRequired,

  setCurrentPage: PropTypes.func.isRequired,

};

export const ellipsis = '...';

const pagination = (currentPage, pageCount) => {

  const delta = 2;

  const pages = range(

    max(delta, currentPage - delta),

    min(pageCount - 1, currentPage + delta) + 1

  );

  if (currentPage - delta > delta) {

    pages.unshift(ellipsis);

  }

  if (currentPage + delta < pageCount - 1) {

    pages.push(ellipsis);

  }

  pages.unshift(1);

  pages.push(pageCount);

  return pages;

};

const SimplePaginator = ({ pagesCount, currentPage, setCurrentPage }) => {

  if (pagesCount < 2) {

    return null;

  }

  const onClick = (page) => () => setCurrentPage(page);

  return (

    <Pagination listClassName="flex-wrap justify-content-center mb-0 simple-paginator">

      <PaginationItem disabled={currentPage <= 1}>

        <PaginationLink previous tag="span" onClick={onClick(currentPage - 1)} />

      </PaginationItem>

      {pagination(currentPage, pagesCount).map((page, index) => (

        <PaginationItem

          key={page !== ellipsis ? page : `${page}_${index}`}

          active={page === currentPage}

          disabled={page === ellipsis}

        >

          <PaginationLink tag="span" onClick={onClick(page)}>{page}</PaginationLink>

        </PaginationItem>

      ))}

      <PaginationItem disabled={currentPage >= pagesCount}>

        <PaginationLink next tag="span" onClick={onClick(currentPage + 1)} />

      </PaginationItem>

    </Pagination>

  );

};

SimplePaginator.propTypes = propTypes;

export default SimplePaginator;