import { linkifyjs, html } from "./index.js";

linkifyjs.options.defaults.defaultProtocol = "https";

linkifyjs.registerCustomProtocol("irc");
linkifyjs.registerCustomProtocol("ircs");

linkifyjs.registerPlugin('ircChannel', ({ scanner, parser, utils }) => {
	const { POUND, DOMAIN, TLD, LOCALHOST, UNDERSCORE, DOT, HYPHEN } = scanner.tokens;
	const START_STATE = parser.start;

	const Channel = utils.createTokenClass('ircChannel', {
		isLink: true,
		toHref() {
			return "irc:///" + this.toString();
		},
	});

	const HASH_STATE = START_STATE.tt(POUND);

	const CHAN_STATE = HASH_STATE.tt(DOMAIN, Channel);
	HASH_STATE.tt(TLD, CHAN_STATE);
	HASH_STATE.tt(LOCALHOST, CHAN_STATE);
	HASH_STATE.tt(POUND, CHAN_STATE);

	CHAN_STATE.tt(UNDERSCORE, CHAN_STATE);
	CHAN_STATE.tt(DOMAIN, CHAN_STATE);
	CHAN_STATE.tt(TLD, CHAN_STATE);
	CHAN_STATE.tt(LOCALHOST, CHAN_STATE);

	const CHAN_DIVIDER_STATE = CHAN_STATE.tt(DOT);

	CHAN_DIVIDER_STATE.tt(UNDERSCORE, CHAN_STATE);
	CHAN_DIVIDER_STATE.tt(DOMAIN, CHAN_STATE);
	CHAN_DIVIDER_STATE.tt(TLD, CHAN_STATE);
	CHAN_DIVIDER_STATE.tt(LOCALHOST, CHAN_STATE);
});

export default function linkify(text, onChannelClick) {
	let links = linkifyjs.find(text);

	let children = [];
	let last = 0;
	links.forEach((match) => {
		if (!match.isLink) {
			return;
		}

		const prefix = text.substring(last, match.start)
		children.push(prefix);

		// TODO: handle all irc/ircs URLs
		if (match.href.startsWith("irc:///")) {
			function onClick(event) {
				event.preventDefault();
				onChannelClick(match.value);
			}
			children.push(html`
				<a
					href="${match.href}"
					onClick=${onClick}
				>${match.value}</a>
			`);
		} else {
			children.push(html`
				<a
					href=${match.href}
					target="_blank"
					rel="noreferrer noopener"
				>${match.value}</a>
			`);
		}

		last = match.end;
	});

	const suffix = text.substring(last)
	children.push(suffix);

	return children;
}