const fs = require("fs");
const path = require("path");

const Koa = require("koa");
const koaPug = require("koa-pug");
const koaRouter = require("koa-router");
const fetch = require("node-fetch");

const config = require("./config");
const util = require("./util");

async function getRadioStatus() {
	try {
		let status = await fetch('http://radio.home/status-json.xsl').then(r => r.json());
		return {
			server_start_iso8601: status.icestats.server_start_iso8601,
			server_start_date: util.datetime(status.icestats.server_start_iso8601, util.post_date_format),
			song: `${status.icestats.source.artist} - ${status.icestats.source.title}`,
			listener_peak: status.icestats.source.listener_peak,
			listeners: status.icestats.source.listeners
		}
	} catch {
		return {
			server_start_iso8601: "n/a",
			server_start_date: "n/a",
			song: "n/a",
			listener_peak: "n/a",
			listeners: "n/a"
		}
	}
}

function setRoutes(router) {
	router.get('/', async ctx => {
		await ctx.render('index', {
			title: "/ Radio",
			description: "Internet-radio broadcasting from under my desk.",
			main_site: util.getServiceByHost(ctx.header.host),
			radio_status: await getRadioStatus()
		});
	})
	.get('/filelist', async ctx => {
		ctx.type = 'text/html';
		ctx.body = fs.readFileSync(
			path.join(__dirname, '/static/radio/assets/files/radio_filelist.html'));
	})
	.get('/playlist', async ctx => {
		ctx.attachment('radio.arav.top.m3u');
		ctx.body = fs.readFileSync(
			path.join(__dirname, '/static/radio/assets/files/radio.arav.top.m3u'));
	})
	.get('/stats', async ctx => {
		ctx.body = await getRadioStatus();
	});
}

module.exports = () => {
	const app = new Koa();
	const pug = new koaPug({
		viewPath: path.join(__dirname, "views", "radio"),
		locals: {
			moment: util.datetime },
		app: app
	});

	const radio_router = koaRouter();
	setRoutes(radio_router);

	app.proxy = true;
	app
		.use(radio_router.routes())
		.listen(config.radio.port, config.radio.host);

	return app;
}