const express = require('express');
const Discord = require("discord.js");
require("dotenv").config();
let hook;
if (process.env.DISCORD_WEBHOOK) {hook = new Discord.WebhookClient({ url: process.env.DISCORD_WEBHOOK })}
const app = express();
const port = process.env.SERVER_PORT || 3000;
const path = require('path');
const fs = require('fs');
const logFile = path.join(__dirname, process.env.LOG_FILE || 'server.log');
var known = [];
const reloadKnown = () => {
	if (!fs.existsSync(path.join(__dirname, process.env.KNOWN_FILE || 'known.json'))) {
		fs.writeFileSync(path.join(__dirname, process.env.KNOWN_FILE || 'known.json'), JSON.stringify([]), 'utf8');
	}
	try {
		const data = fs.readFileSync(path.join(__dirname, process.env.KNOWN_FILE || 'known.json'), 'utf8');
		known = JSON.parse(data);
	} catch (err) {
		console.error('Error reading known file:', err);
	}
}

reloadKnown();

const checkKnown = (id) => {
	reloadKnown();
	if (known.includes(id)) {
		return true;
	} else {
		known.push(id);
		console.log(`New ID added! ${id}`);
		if (process.env.DISCORD_WEBHOOK) {
			hook.send(`[New Game ID! ${id}](https://www.roblox.com/games/${id})`);
		}
		fs.writeFileSync(path.join(__dirname, process.env.KNOWN_FILE || 'known.json'), JSON.stringify(known), 'utf8');
		return false;
	}
};

app.use(express.static(path.join(__dirname, 'public')));

app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use((req, res, next) => {
	//Logger
	// [timestamp] method - url; UA; IP; roblox-id header if it exists
	const timestamp = new Date().toISOString();
	const method = req.method;
	const url = req.originalUrl;
	const userAgent = req.headers['user-agent'] || 'unknown';
	const ip = req.headers['x-forwarded-for'] || req.remoteAddress || 'unknown';
	const robloxId = req.headers['roblox-id'] || 'none';
	const logEntry = `[${timestamp}] ${method} - ${url}; UA: ${userAgent}; IP: ${ip}; Roblox-ID: ${robloxId}\n`;
	fs.appendFileSync(logFile, logEntry, 'utf8', (err) => {
		if (err) {
			console.error('Error writing to log file:', err);
		}
	});
	if (userAgent.includes('Roblox')) {
		checkKnown(robloxId);
		console.log(logEntry.trim());
	}
	next();
});

app.get('/', (req, res) => {
	res.sendFile(path.join(__dirname, 'msg.html'));
});

app.get('/time.php', (req, res) => {
	// This endpoint returns the current time in a specific format based on the timezone provided
	const tz = req.query.zone || 'UTC';
	const date = new Date();
	try {
		const options = { timeZone: tz, hour12: false };
		const formatter = new Intl.DateTimeFormat('en-GB', {
			...options,
			year: 'numeric',
			month: '2-digit',
			day: '2-digit',
			hour: '2-digit',
			minute: '2-digit',
			second: '2-digit'
		});

		/*
		{
			...options,
			year: 'numeric',
			month: '2-digit',
			day: '2-digit',
			hour: '2-digit',
			minute: '2-digit',
			second: '2-digit'
		} // Old format
			*/
		// Example output with space-padded single digits instead of zero-padded
		const spacePad = n => n.toString().padStart(2, ' ');
		const parts = formatter.formatToParts(date);
		const get = type => parts.find(p => p.type === type).value;
		//const formatted = `${get('day')}${get('month')}${get('year')}${get('hour')}${get('minute')}${get('second')}`;
		const singleDigit = n => ' ' + (n.startsWith('0') ? n.slice(1) : n); 
		const formatted = `${singleDigit(get('day'))}${singleDigit(get('month'))}${singleDigit(get('year'))}${singleDigit(get('hour'))}${singleDigit(get('minute'))}${singleDigit(get('second'))}`;
		const msg = fs.readFileSync(path.join(__dirname, 'msg.html'), 'utf8');
		res.send(`${formatted}<br><br>${msg}`);
	} catch (e) {
		res.status(400).send('Invalid timezone');
	}
});



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