/**
 * @copyright (c) 2017 Arthur Schiwon <blizzz@arthur-schiwon.de>
 *
 * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
 *
 * This file is licensed under the Affero General Public License version 3 or
 * later. See the COPYING file.
 */

import $ from 'jquery'

/*
 * Detects links:
 * Either the http(s) protocol is given or two strings, basically limited to ascii with the last
 * 	word being at least one digit long,
 * followed by at least another character
 *
 * The downside: anything not ascii is excluded. Not sure how common it is in areas using different
 * alphabets… the upside: fake domains with similar looking characters won't be formatted as links
 */
const urlRegex = /(\s|^)(https?:\/\/)?((?:[-A-Z0-9+_]+\.)+[-A-Z]+(?:\/[-A-Z0-9+&@#%?=~_|!:,.;()]*)*)(\s|$)/ig;

export function plainToRich (content) {
	return this.formatLinksRich(content);
}

export function richToPlain (content) {
	return this.formatLinksPlain(content);
}

export function formatLinksRich (content) {
	return content.replace(urlRegex, function (_, leadingSpace, protocol, url, trailingSpace) {
		let linkText = url;
		if (!protocol) {
			protocol = 'https://';
		} else if (protocol === 'http://') {
			linkText = protocol + url;
		}

		return leadingSpace + '<a class="external" target="_blank" rel="noopener noreferrer" href="' + protocol + url + '">' + linkText + '</a>' + trailingSpace;
	});
}

export function formatLinksPlain (content) {
	const $content = $('<div></div>').html(content);
	$content.find('a').each(function () {
		const $this = $(this);
		$this.html($this.attr('href'));
	});
	return $content.html();
}