content: import React from 'react';
  import PropTypes from 'prop-types';
  import Immutable from 'immutable';
  import ImmutablePropTypes from 'react-immutable-proptypes';
  import { FormattedMessage } from 'react-intl';
  import punycode from 'punycode';
  import classnames from 'classnames';
  import Icon from 'mastodon/components/icon';
  import { useBlurhash } from 'mastodon/initial_state';
  import Blurhash from 'mastodon/components/blurhash';
  import { debounce } from 'lodash';
  
  const IDNA_PREFIX = 'xn--';
  
  const decodeIDNA = domain => {
    return domain
      .split('.')
      .map(part => part.indexOf(IDNA_PREFIX) === 0 ? punycode.decode(part.slice(IDNA_PREFIX.length)) : part)
      .join('.');
  };
  
  const getHostname = url => {
    const parser = document.createElement('a');
    parser.href = url;
    return parser.hostname;
  };
  
  const trim = (text, len) => {
    const cut = text.indexOf(' ', len);
  
    if (cut === -1) {
      return text;
    }
  
    return text.slice(0, cut) + (text.length > len ? '…' : '');
  };
  
  const domParser = new DOMParser();
  
  const addAutoPlay = html => {
    const document = domParser.parseFromString(html, 'text/html').documentElement;
    const iframe = document.querySelector('iframe');
  
    if (iframe) {
      if (iframe.src.indexOf('?') !== -1) {
        iframe.src += '&';
      } else {
        iframe.src += '?';
      }
  
      iframe.src += 'autoplay=1&auto_play=1';
  
      // DOM parser creates html/body elements around original HTML fragment,
      // so we need to get innerHTML out of the body and not the entire document
      return document.querySelector('body').innerHTML;
    }
  
    return html;
  };
  
  export default class Card extends React.PureComponent {
  
    static propTypes = {
      card: ImmutablePropTypes.map,
      maxDescription: PropTypes.number,
      onOpenMedia: PropTypes.func.isRequired,
      compact: PropTypes.bool,
      defaultWidth: PropTypes.number,
      cacheWidth: PropTypes.func,
      sensitive: PropTypes.bool,
    };
  
    static defaultProps = {
      maxDescription: 50,
      compact: false,
    };
  
    state = {
      width: this.props.defaultWidth || 280,
      previewLoaded: false,
      embedded: false,
      revealed: !this.props.sensitive,
    };
  
    componentWillReceiveProps (nextProps) {
      if (!Immutable.is(this.props.card, nextProps.card)) {
        this.setState({ embedded: false, previewLoaded: false });
      }
      if (this.props.sensitive !== nextProps.sensitive) {
        this.setState({ revealed: !nextProps.sensitive });
      }
    }
  
    componentDidMount () {
      window.addEventListener('resize', this.handleResize, { passive: true });
    }
  
    componentWillUnmount () {
      window.removeEventListener('resize', this.handleResize);
    }
  
    _setDimensions () {
      const width = this.node.offsetWidth;
  
      if (this.props.cacheWidth) {
        this.props.cacheWidth(width);
      }
  
      this.setState({ width });
    }
  
    handleResize = debounce(() => {
      if (this.node) {
        this._setDimensions();
      }
    }, 250, {
      trailing: true,
    });
  
    handlePhotoClick = () => {
      const { card, onOpenMedia } = this.props;
  
      onOpenMedia(
        Immutable.fromJS([
          {
            type: 'image',
            url: card.get('embed_url'),
            description: card.get('title'),
            meta: {
              original: {
                width: card.get('width'),
                height: card.get('height'),
              },
            },
          },
        ]),
        0,
      );
    };
  
    handleEmbedClick = () => {
      const { card } = this.props;
  
      if (card.get('type') === 'photo') {
        this.handlePhotoClick();
      } else {
        this.setState({ embedded: true });
      }
    }
  
    setRef = c => {
      this.node = c;
  
      if (this.node) {
        this._setDimensions();
      }
    }
  
    handleImageLoad = () => {
      this.setState({ previewLoaded: true });
    }
  
    handleReveal = e => {
      e.preventDefault();
      e.stopPropagation();
      this.setState({ revealed: true });
    }
  
    renderVideo () {
      const { card }  = this.props;
      const content   = { __html: addAutoPlay(card.get('html')) };
      const { width } = this.state;
      const ratio     = card.get('width') / card.get('height');
      const height    = width / ratio;
  
      return (
        <div
          ref={this.setRef}
          className='status-card__image status-card-video'
          dangerouslySetInnerHTML={content}
          style={{ height }}
        />
      );
    }
  
    render () {
      const { card, maxDescription, compact } = this.props;
      const { width, embedded, revealed } = this.state;
  
      if (card === null) {
        return null;
      }
  
      const provider    = card.get('provider_name').length === 0 ? decodeIDNA(getHostname(card.get('url'))) : card.get('provider_name');
      const horizontal  = (!compact && card.get('width') > card.get('height') && (card.get('width') + 100 >= width)) || card.get('type') !== 'link' || embedded;
      const interactive = card.get('type') !== 'link';
      const className   = classnames('status-card', { horizontal, compact, interactive });
      const title       = interactive ? <a className='status-card__title' href={card.get('url')} title={card.get('title')} rel='noopener noreferrer' target='_blank'><strong>{card.get('title')}</strong></a> : <strong className='status-card__title' title={card.get('title')}>{card.get('title')}</strong>;
      const ratio       = card.get('width') / card.get('height');
      const height      = (compact && !embedded) ? (width / (16 / 9)) : (width / ratio);
  
      const description = (
        <div className='status-card__content'>
          {title}
          {!(horizontal || compact) && <p className='status-card__description'>{trim(card.get('description') || '', maxDescription)}</p>}
          <span className='status-card__host'>{provider}</span>
        </div>
      );
  
      let embed     = '';
      let canvas = (
        <Blurhash
          className={classnames('status-card__image-preview', {
            'status-card__image-preview--hidden': revealed && this.state.previewLoaded,
          })}
          hash={card.get('blurhash')}
          dummy={!useBlurhash}
        />
      );
      let thumbnail = <img src={card.get('image')} alt='' style={{ width: horizontal ? width : null, height: horizontal ? height : null, visibility: revealed ? null : 'hidden' }} onLoad={this.handleImageLoad} className='status-card__image-image' />;
      let spoilerButton = (
        <button type='button' onClick={this.handleReveal} className='spoiler-button__overlay'>
          <span className='spoiler-button__overlay__label'><FormattedMessage id='status.sensitive_warning' defaultMessage='Sensitive content' /></span>
        </button>
      );
      spoilerButton = (
        <div className={classnames('spoiler-button', { 'spoiler-button--minified': revealed })}>
          {spoilerButton}
        </div>
      );
  
      if (interactive) {
        if (embedded) {
          embed = this.renderVideo();
        } else {
          let iconVariant = 'play';
  
          if (card.get('type') === 'photo') {
            iconVariant = 'search-plus';
          }
  
          embed = (
            <div className='status-card__image'>
              {canvas}
              {thumbnail}
  
              {revealed && (
                <div className='status-card__actions'>
                  <div>
                    <button onClick={this.handleEmbedClick}><Icon id={iconVariant} /></button>
                    {horizontal && <a href={card.get('url')} target='_blank' rel='noopener noreferrer'><Icon id='external-link' /></a>}
                  </div>
                </div>
              )}
              {!revealed && spoilerButton}
            </div>
          );
        }
  
        return (
          <div className={className} ref={this.setRef} onClick={revealed ? null : this.handleReveal} role={revealed ? 'button' : null}>
            {embed}
            {!compact && description}
          </div>
        );
      } else if (card.get('image')) {
        embed = (
          <div className='status-card__image'>
            {canvas}
            {thumbnail}
          </div>
        );
      } else {
        embed = (
          <div className='status-card__image'>
            <Icon id='file-text' />
          </div>
        );
      }
  
      return (
        <a href={card.get('url')} className={className} target='_blank' rel='noopener noreferrer' ref={this.setRef}>
          {embed}
          {description}
        </a>
      );
    }
  
  }
  