/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import React from 'react';
import { Anchor } from 'antd';
import { useMenus } from 'docz';
import { css } from '@emotion/core';
import { getActiveMenuItem, mq } from '../utils';

const { Link } = Anchor;
const anchorNavStyle = css`

    ${[mq[3]]} {
      display: none;
    }
    position: fixed;
    top: 64px;
    right: 0;
    width: 250px;
    padding: 16px;
    height: 605px;
    overflow: auto;
    ul {
      font-size: 12px;
      li {
        height: 25px;
        line-height: 25px;
        word-wrap: break-word;
      }
    }
`;

const HeaderNav = () => {
  const menus = useMenus();
  const { headings } = getActiveMenuItem(menus);
  return (
    <div css={anchorNavStyle}>
      <Anchor>
        {headings.map((e) => (
          <Link key={e.slug} href={`#${e.slug}`} title={e.value} />
        ))}
      </Anchor>
    </div>
  );
};

export default HeaderNav;
