const express = require('express');

const app = express();
const port = process.env.SERVER_PORT || 3000;

app.get('/', (req, res) => {
	res.send('Hello, world!');
});

app.get('/time.php', (req, res) => {
	const tz = req.query.zone || 'UTC';
	try {
		const date = new Date();
		const options = { timeZone: tz, hour12: false };
		const pad = n => n.toString().padStart(2, '0');
		const year = date.toLocaleString('en-GB', { ...options, year: 'numeric' });
		const month = pad(date.toLocaleString('en-GB', { ...options, month: '2-digit' }));
		const day = pad(date.toLocaleString('en-GB', { ...options, day: '2-digit' }));
		const hour = pad(date.toLocaleString('en-GB', { ...options, hour: '2-digit', hourCycle: 'h23' }));
		const minute = pad(date.toLocaleString('en-GB', { ...options, minute: '2-digit' }));
		const second = pad(date.toLocaleString('en-GB', { ...options, second: '2-digit' }));
		const timeString = `${day}${month}${year}${hour}${minute}${second}`;
		res.send(timeString);
	} catch (err) {
		res.status(400).send('Invalid timezone');
	}
});

app.listen(port, () => {
	console.log(`Server is running on port ${port}`);
});