import express from "express";
import logRequest from "./logger.js";
import { parse } from "node-html-parser";
import { format } from "util";

const config = {
	FUCKING_ENDPOINT:
		process.env.FUCKING_ENDPOINT ??
		"https://publish.twitter.com/oembed?url=",
	TWITTER_BASE_URL: process.env.TWITTER_BASE_URL ?? "https://x.com/",
	title: process.env.APP_TITLE ?? "biter",
	description: process.env.APP_TITLE ?? "biter twitter proxy",
};

const app = express();

app.set("view engine", "ejs");
app.set("views", "views");

app.use(logRequest);
app.use(express.static("static"));

app.get("/*/status/*", async (req, res) => {
	let target =
		config.FUCKING_ENDPOINT +
		encodeURIComponent(config.TWITTER_BASE_URL + req.url.slice(1));
	let twitter_res;
	try {
		twitter_res = await fetch(target);
	} catch (err) {
		return res
			.status(502)
			.send("Error from Twitter API: " + format("%s", err));
	}
	if (twitter_res.status == 200) {
		let body;
		try {
			body = await twitter_res.json();
		} catch (err) {
			return res
				.status(502)
				.send("Error from Twitter API: " + format("%s", err));
		}
		let html = parse(body.html);
		let block = html.firstChild;
		let content = block.childNodes[0].innerText;
		let author = block.childNodes[1].toString();
		let [_, authorName, authorHandle] = author.match(
			/— (.+) \(@([\w\d_]+)\)/
		);
		let authorUrl = config.TWITTER_BASE_URL + authorHandle;
		res.render("displayTweet", {
			title: config.title,
			description: config.description,
			authorName,
			authorHandle,
			authorUrl,
			content,
			url: config.TWITTER_BASE_URL + req.url.slice(1),
		});
	} else {
		return res.sendStatus(502);
	}
});

app.get("/", (req, res) =>
	res.render("index", {
		title: config.title,
		description: config.description,
	})
);

let server = app.listen(process.env.PORT ?? 3000, () => {
	let address = server.address();
	let ip = address.address;
	if (address.family === "IPv6") ip = `[${ip}]`;
	console.log(`listening on http://${ip}:${address.port}/`);
});