// Credit: https://gist.github.com/yangshun/9892961
const video = {
    parse: function(url) {
        // - Supported YouTube URL formats:
        //   - http://www.youtube.com/watch?v=My2FRPA3Gf8
        //   - http://youtu.be/My2FRPA3Gf8
        //   - https://youtube.googleapis.com/v/My2FRPA3Gf8
        // - Supported Vimeo URL formats:
        //   - http://vimeo.com/25451551
        //   - http://player.vimeo.com/video/25451551
        // - Also supports relative URLs:
        //   - //player.vimeo.com/video/25451551

        url.match(/(http:|https:|)\/\/(player.|www.)?(vimeo\.com|youtu(be\.com|\.be|be\.googleapis\.com))\/(video\/|embed\/|watch\?v=|v\/)?([A-Za-z0-9._%-]*)(\&\S+)?/);

        if (RegExp.$3.indexOf('youtu') > -1) {
            var type = 'youtube';
        } else if (RegExp.$3.indexOf('vimeo') > -1) {
            var type = 'vimeo';
        }

        return {
            type: type,
            id: RegExp.$6
        };
    },

    // Returns an iframe of the video with the specified URL.
    createEmbed: function(url, width, height) {
        var self = this;
        var videoObj = self.parse(url);

        var iframe = document.createElement('iframe');
        iframe.width = width || 560;
        iframe.height = height || 315;
        iframe.frameborder = 0;
        iframe.setAttribute('allowFullScreen', '');

        if (videoObj.type == 'youtube') {
            iframe.src = '//www.youtube.com/embed/' + videoObj.id;
            iframe.allow = "accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture";
        } else if (videoObj.type == 'vimeo') {
            iframe.src = '//player.vimeo.com/video/' + videoObj.id;
            iframe.allow = "autoplay; fullscreen";
        }

        return iframe;
    },

    // Obtains the video's thumbnail and passed it back to a callback function.
    getThumbnail: function(url, cb) {
        var self = this;
        var videoObj = self.parse(url);
        var thumbUrl;

        switch (videoObj.type) {
            case 'youtube':
                thumbUrl = '//img.youtube.com/vi/' + videoObj.id + '/maxresdefault.jpg';
                break;
            case 'vimeo':
                thumbUrl = '//i.vimeocdn.com/video/' + videoObj.id + '_640.jpg';
                break;
            default:
                thumbUrl = '';
                break;
        }

        return thumbUrl;
    },
};

// Example
document.querySelector('.video').appendChild(video.createEmbed('https://www.youtube.com/watch?v=acHKPu4oIro'))