content: import React from 'react';
  import PropTypes from 'prop-types';
  import { NavLink, withRouter } from 'react-router-dom';
  import { FormattedMessage, injectIntl } from 'react-intl';
  import { debounce } from 'lodash';
  import { isUserTouching } from '../../../is_mobile';
  import Icon from 'mastodon/components/icon';
  import NotificationsCounterIcon from './notifications_counter_icon';
  
  export const links = [
    <NavLink className='tabs-bar__link' to='/home' data-preview-title-id='column.home' data-preview-icon='home' ><Icon id='home' fixedWidth /><FormattedMessage id='tabs_bar.home' defaultMessage='Home' /></NavLink>,
    <NavLink className='tabs-bar__link' to='/notifications' data-preview-title-id='column.notifications' data-preview-icon='bell' ><NotificationsCounterIcon /><FormattedMessage id='tabs_bar.notifications' defaultMessage='Notifications' /></NavLink>,
    <NavLink className='tabs-bar__link' to='/public/local' data-preview-title-id='column.community' data-preview-icon='users' ><Icon id='users' fixedWidth /><FormattedMessage id='tabs_bar.local_timeline' defaultMessage='Local' /></NavLink>,
    <NavLink className='tabs-bar__link' exact to='/public' data-preview-title-id='column.public' data-preview-icon='globe' ><Icon id='globe' fixedWidth /><FormattedMessage id='tabs_bar.federated_timeline' defaultMessage='Federated' /></NavLink>,
    <NavLink className='tabs-bar__link optional' to='/explore' data-preview-title-id='tabs_bar.search' data-preview-icon='search' ><Icon id='search' fixedWidth /><FormattedMessage id='tabs_bar.search' defaultMessage='Search' /></NavLink>,
    <NavLink className='tabs-bar__link' style={{ flexGrow: '0', flexBasis: '30px' }} to='/getting-started' data-preview-title-id='getting_started.heading' data-preview-icon='bars' ><Icon id='bars' fixedWidth /></NavLink>,
  ];
  
  export function getIndex (path) {
    return links.findIndex(link => link.props.to === path);
  }
  
  export function getLink (index) {
    return links[index].props.to;
  }
  
  export default @injectIntl
  @withRouter
  class TabsBar extends React.PureComponent {
  
    static propTypes = {
      intl: PropTypes.object.isRequired,
      history: PropTypes.object.isRequired,
    }
  
    setRef = ref => {
      this.node = ref;
    }
  
    handleClick = (e) => {
      // Only apply optimization for touch devices, which we assume are slower
      // We thus avoid the 250ms delay for non-touch devices and the lag for touch devices
      if (isUserTouching()) {
        e.preventDefault();
        e.persist();
  
        requestAnimationFrame(() => {
          const tabs = Array(...this.node.querySelectorAll('.tabs-bar__link'));
          const currentTab = tabs.find(tab => tab.classList.contains('active'));
          const nextTab = tabs.find(tab => tab.contains(e.target));
          const { props: { to } } = links[Array(...this.node.childNodes).indexOf(nextTab)];
  
  
          if (currentTab !== nextTab) {
            if (currentTab) {
              currentTab.classList.remove('active');
            }
  
            const listener = debounce(() => {
              nextTab.removeEventListener('transitionend', listener);
              this.props.history.push(to);
            }, 50);
  
            nextTab.addEventListener('transitionend', listener);
            nextTab.classList.add('active');
          }
        });
      }
  
    }
  
    render () {
      const { intl: { formatMessage } } = this.props;
  
      return (
        <div className='tabs-bar__wrapper'>
          <nav className='tabs-bar' ref={this.setRef}>
            {links.map(link => React.cloneElement(link, { key: link.props.to, onClick: this.handleClick, 'aria-label': formatMessage({ id: link.props['data-preview-title-id'] }) }))}
          </nav>
  
          <div id='tabs-bar__portal' />
        </div>
      );
    }
  
  }
  