lbry-desktop/src/renderer/component/cardMedia/view.jsx

import React from 'react';

class CardMedia extends React.PureComponent {
  static AUTO_THUMB_CLASSES = [
    'purple',
    'red',
    'pink',
    'indigo',
    'blue',
    'light-blue',
    'cyan',
    'teal',
    'green',
    'yellow',
    'orange',
  ];

  componentWillMount() {
    this.setState({
      autoThumbClass:
        CardMedia.AUTO_THUMB_CLASSES[
          Math.floor(Math.random() * CardMedia.AUTO_THUMB_CLASSES.length)
        ],
    });
  }

  render() {
    const { title, thumbnail } = this.props;
    const atClass = this.state.autoThumbClass;

    if (thumbnail) {
      return <div className="card__media" style={{ backgroundImage: `url('${thumbnail}')` }} />;
    }

    return (
      <div className={`card__media card__media--autothumb ${atClass}`}>
        <div className="card__autothumb__text">
          {title &&
            title
              .replace(/\s+/g, '')
              .substring(0, Math.min(title.replace(' ', '').length, 5))
              .toUpperCase()}
        </div>
      </div>
    );
  }
}

export default CardMedia;