content: import React from 'react';
  import PropTypes from 'prop-types';
  import ReactSwipeableViews from 'react-swipeable-views';
  import classNames from 'classnames';
  import { connect } from 'react-redux';
  import { FormattedMessage } from 'react-intl';
  import { closeOnboarding } from '../../actions/onboarding';
  import screenHello from '../../../images/screen_hello.svg';
  import screenFederation from '../../../images/screen_federation.svg';
  import screenInteractions from '../../../images/screen_interactions.svg';
  import logoTransparent from '../../../images/logo_transparent.svg';
  import { disableSwiping } from 'mastodon/initial_state';
  
  const FrameWelcome = ({ domain, onNext }) => (
    <div className='introduction__frame'>
      <div className='introduction__illustration' style={{ background: `url(${logoTransparent}) no-repeat center center / auto 80%` }}>
        <img src={screenHello} alt='' />
      </div>
  
      <div className='introduction__text introduction__text--centered'>
        <h3><FormattedMessage id='introduction.welcome.headline' defaultMessage='First steps' /></h3>
        <p><FormattedMessage id='introduction.welcome.text' defaultMessage="Welcome to the fediverse! In a few moments, you'll be able to broadcast messages and talk to your friends across a wide variety of servers. But this server, {domain}, is special—it hosts your profile, so remember its name." values={{ domain: <code>{domain}</code> }} /></p>
      </div>
  
      <div className='introduction__action'>
        <button className='button' onClick={onNext}><FormattedMessage id='introduction.welcome.action' defaultMessage="Let's go!" /></button>
      </div>
    </div>
  );
  
  FrameWelcome.propTypes = {
    domain: PropTypes.string.isRequired,
    onNext: PropTypes.func.isRequired,
  };
  
  const FrameFederation = ({ onNext }) => (
    <div className='introduction__frame'>
      <div className='introduction__illustration'>
        <img src={screenFederation} alt='' />
      </div>
  
      <div className='introduction__text introduction__text--columnized'>
        <div>
          <h3><FormattedMessage id='introduction.federation.home.headline' defaultMessage='Home' /></h3>
          <p><FormattedMessage id='introduction.federation.home.text' defaultMessage='Posts from people you follow will appear in your home feed. You can follow anyone on any server!' /></p>
        </div>
  
        <div>
          <h3><FormattedMessage id='introduction.federation.local.headline' defaultMessage='Local' /></h3>
          <p><FormattedMessage id='introduction.federation.local.text' defaultMessage='Public posts from people on the same server as you will appear in the local timeline.' /></p>
        </div>
  
        <div>
          <h3><FormattedMessage id='introduction.federation.federated.headline' defaultMessage='Federated' /></h3>
          <p><FormattedMessage id='introduction.federation.federated.text' defaultMessage='Public posts from other servers of the fediverse will appear in the federated timeline.' /></p>
        </div>
      </div>
  
      <div className='introduction__action'>
        <button className='button' onClick={onNext}><FormattedMessage id='introduction.federation.action' defaultMessage='Next' /></button>
      </div>
    </div>
  );
  
  FrameFederation.propTypes = {
    onNext: PropTypes.func.isRequired,
  };
  
  const FrameInteractions = ({ onNext }) => (
    <div className='introduction__frame'>
      <div className='introduction__illustration'>
        <img src={screenInteractions} alt='' />
      </div>
  
      <div className='introduction__text introduction__text--columnized'>
        <div>
          <h3><FormattedMessage id='introduction.interactions.reply.headline' defaultMessage='Reply' /></h3>
          <p><FormattedMessage id='introduction.interactions.reply.text' defaultMessage="You can reply to other people's and your own toots, which will chain them together in a conversation." /></p>
        </div>
  
        <div>
          <h3><FormattedMessage id='introduction.interactions.reblog.headline' defaultMessage='Boost' /></h3>
          <p><FormattedMessage id='introduction.interactions.reblog.text' defaultMessage="You can share other people's toots with your followers by boosting them." /></p>
        </div>
  
        <div>
          <h3><FormattedMessage id='introduction.interactions.favourite.headline' defaultMessage='Favourite' /></h3>
          <p><FormattedMessage id='introduction.interactions.favourite.text' defaultMessage='You can save a toot for later, and let the author know that you liked it, by favouriting it.' /></p>
        </div>
      </div>
  
      <div className='introduction__action'>
        <button className='button' onClick={onNext}><FormattedMessage id='introduction.interactions.action' defaultMessage='Finish toot-orial!' /></button>
      </div>
    </div>
  );
  
  FrameInteractions.propTypes = {
    onNext: PropTypes.func.isRequired,
  };
  
  export default @connect(state => ({ domain: state.getIn(['meta', 'domain']) }))
  class Introduction extends React.PureComponent {
  
    static propTypes = {
      domain: PropTypes.string.isRequired,
      dispatch: PropTypes.func.isRequired,
    };
  
    state = {
      currentIndex: 0,
    };
  
    componentWillMount () {
      this.pages = [
        <FrameWelcome domain={this.props.domain} onNext={this.handleNext} />,
        <FrameFederation onNext={this.handleNext} />,
        <FrameInteractions onNext={this.handleFinish} />,
      ];
    }
  
    componentDidMount() {
      window.addEventListener('keyup', this.handleKeyUp);
    }
  
    componentWillUnmount() {
      window.addEventListener('keyup', this.handleKeyUp);
    }
  
    handleDot = (e) => {
      const i = Number(e.currentTarget.getAttribute('data-index'));
      e.preventDefault();
      this.setState({ currentIndex: i });
    }
  
    handlePrev = () => {
      this.setState(({ currentIndex }) => ({
        currentIndex: Math.max(0, currentIndex - 1),
      }));
    }
  
    handleNext = () => {
      const { pages } = this;
  
      this.setState(({ currentIndex }) => ({
        currentIndex: Math.min(currentIndex + 1, pages.length - 1),
      }));
    }
  
    handleSwipe = (index) => {
      this.setState({ currentIndex: index });
    }
  
    handleFinish = () => {
      this.props.dispatch(closeOnboarding());
    }
  
    handleKeyUp = ({ key }) => {
      switch (key) {
      case 'ArrowLeft':
        this.handlePrev();
        break;
      case 'ArrowRight':
        this.handleNext();
        break;
      }
    }
  
    render () {
      const { currentIndex } = this.state;
      const { pages } = this;
  
      return (
        <div className='introduction'>
          <ReactSwipeableViews index={currentIndex} onChangeIndex={this.handleSwipe} disabled={disableSwiping} className='introduction__pager'>
            {pages.map((page, i) => (
              <div key={i} className={classNames('introduction__frame-wrapper', { 'active': i === currentIndex })}>{page}</div>
            ))}
          </ReactSwipeableViews>
  
          <div className='introduction__dots'>
            {pages.map((_, i) => (
              <div
                key={`dot-${i}`}
                role='button'
                tabIndex='0'
                data-index={i}
                onClick={this.handleDot}
                className={classNames('introduction__dot', { active: i === currentIndex })}
              />
            ))}
          </div>
        </div>
      );
    }
  
  }
  