content: import React from 'react';
  import ImmutablePropTypes from 'react-immutable-proptypes';
  import PropTypes from 'prop-types';
  import IconButton from './icon_button';
  import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
  import { isIOS } from '../is_mobile';
  
  const messages = defineMessages({
    toggle_visible: { id: 'media_gallery.toggle_visible', defaultMessage: 'Toggle visibility' },
  });
  
  class Item extends React.PureComponent {
  
    static contextTypes = {
      router: PropTypes.object,
    };
  
    static propTypes = {
      attachment: ImmutablePropTypes.map.isRequired,
      index: PropTypes.number.isRequired,
      size: PropTypes.number.isRequired,
      onClick: PropTypes.func.isRequired,
      autoPlayGif: PropTypes.bool,
    };
  
    static defaultProps = {
      autoPlayGif: false,
    };
  
    handleMouseEnter = (e) => {
      if (this.hoverToPlay()) {
        e.target.play();
      }
    }
  
    handleMouseLeave = (e) => {
      if (this.hoverToPlay()) {
        e.target.pause();
        e.target.currentTime = 0;
      }
    }
  
    hoverToPlay () {
      const { attachment, autoPlayGif } = this.props;
      return !autoPlayGif && attachment.get('type') === 'gifv';
    }
  
    handleClick = (e) => {
      const { index, onClick } = this.props;
  
      if (this.context.router && e.button === 0) {
        e.preventDefault();
        onClick(index);
      }
  
      e.stopPropagation();
    }
  
    render () {
      const { attachment, index, size } = this.props;
  
      let width  = 50;
      let height = 100;
      let top    = 'auto';
      let left   = 'auto';
      let bottom = 'auto';
      let right  = 'auto';
  
      if (size === 1) {
        width = 100;
      }
  
      if (size === 4 || (size === 3 && index > 0)) {
        height = 50;
      }
  
      if (size === 2) {
        if (index === 0) {
          right = '2px';
        } else {
          left = '2px';
        }
      } else if (size === 3) {
        if (index === 0) {
          right = '2px';
        } else if (index > 0) {
          left = '2px';
        }
  
        if (index === 1) {
          bottom = '2px';
        } else if (index > 1) {
          top = '2px';
        }
      } else if (size === 4) {
        if (index === 0 || index === 2) {
          right = '2px';
        }
  
        if (index === 1 || index === 3) {
          left = '2px';
        }
  
        if (index < 2) {
          bottom = '2px';
        } else {
          top = '2px';
        }
      }
  
      let thumbnail = '';
  
      if (attachment.get('type') === 'image') {
        const previewUrl = attachment.get('preview_url');
        const previewWidth = attachment.getIn(['meta', 'small', 'width']);
  
        const originalUrl = attachment.get('url');
        const originalWidth = attachment.getIn(['meta', 'original', 'width']);
  
        const hasSize = typeof originalWidth === 'number' && typeof previewWidth === 'number';
  
        const srcSet = hasSize && `${originalUrl} ${originalWidth}w, ${previewUrl} ${previewWidth}w`;
        const sizes = hasSize && `(min-width: 1025px) ${320 * (width / 100)}px, ${width}vw`;
  
        thumbnail = (
          <a
            className='media-gallery__item-thumbnail'
            href={attachment.get('remote_url') || originalUrl}
            onClick={this.handleClick}
            target='_blank'
          >
            <img src={previewUrl} srcSet={srcSet} sizes={sizes} alt='' />
          </a>
        );
      } else if (attachment.get('type') === 'gifv') {
        const autoPlay = !isIOS() && this.props.autoPlayGif;
  
        thumbnail = (
          <div className={`media-gallery__gifv ${autoPlay ? 'autoplay' : ''}`}>
            <video
              className='media-gallery__item-gifv-thumbnail'
              role='application'
              src={attachment.get('url')}
              onClick={this.handleClick}
              onMouseEnter={this.handleMouseEnter}
              onMouseLeave={this.handleMouseLeave}
              autoPlay={autoPlay}
              loop
              muted
            />
  
            <span className='media-gallery__gifv__label'>GIF</span>
          </div>
        );
      }
  
      return (
        <div className='media-gallery__item' key={attachment.get('id')} style={{ left: left, top: top, right: right, bottom: bottom, width: `${width}%`, height: `${height}%` }}>
          {thumbnail}
        </div>
      );
    }
  
  }
  
  @injectIntl
  export default class MediaGallery extends React.PureComponent {
  
    static propTypes = {
      sensitive: PropTypes.bool,
      media: ImmutablePropTypes.list.isRequired,
      height: PropTypes.number.isRequired,
      onOpenMedia: PropTypes.func.isRequired,
      intl: PropTypes.object.isRequired,
      autoPlayGif: PropTypes.bool,
    };
  
    static defaultProps = {
      autoPlayGif: false,
    };
  
    state = {
      visible: !this.props.sensitive,
    };
  
    handleOpen = () => {
      this.setState({ visible: !this.state.visible });
    }
  
    handleClick = (index) => {
      this.props.onOpenMedia(this.props.media, index);
    }
  
    render () {
      const { media, intl, sensitive } = this.props;
  
      let children;
  
      if (!this.state.visible) {
        let warning;
  
        if (sensitive) {
          warning = <FormattedMessage id='status.sensitive_warning' defaultMessage='Sensitive content' />;
        } else {
          warning = <FormattedMessage id='status.media_hidden' defaultMessage='Media hidden' />;
        }
  
        children = (
          <div role='button' tabIndex='0' className='media-spoiler' onClick={this.handleOpen}>
            <span className='media-spoiler__warning'>{warning}</span>
            <span className='media-spoiler__trigger'><FormattedMessage id='status.sensitive_toggle' defaultMessage='Click to view' /></span>
          </div>
        );
      } else {
        const size = media.take(4).size;
        children = media.take(4).map((attachment, i) => <Item key={attachment.get('id')} onClick={this.handleClick} attachment={attachment} autoPlayGif={this.props.autoPlayGif} index={i} size={size} />);
      }
  
      return (
        <div className='media-gallery' style={{ height: `${this.props.height}px` }}>
          <div className={`spoiler-button ${this.state.visible ? 'spoiler-button--visible' : ''}`}>
            <IconButton title={intl.formatMessage(messages.toggle_visible)} icon={this.state.visible ? 'eye' : 'eye-slash'} overlay onClick={this.handleOpen} />
          </div>
  
          {children}
        </div>
      );
    }
  
  }
  