const mysql = require('mysql')
const express = require('express')
const session = require('express-session')
const handlebars = require('handlebars')
const path = require('path')
const fs = require('fs')

console.log('[MySQL]: Connecting ...')

const connection = mysql.createConnection({
	host     : 'localhost',
	user     : 'root',
	password : '',
	database : 'nodelogin'
})

const staticPath = path.join(__dirname, '..', 'static')
const dynPath = path.join(__dirname, '..', 'dynamic')

console.log('[MySQL]: Ok')

const app = express()

app.use(session({
	secret: 'secret',
	resave: true,
	saveUninitialized: true,
}))
app.use(express.json())
app.use(express.urlencoded({ extended: true }))
app.use(express.static(staticPath))

app.get('/', (req, res) => {
	res.sendFile(path.join(staticPath, 'login.html'))
})

app.post('/login', function(req, res) {
	try {
		const username = req.body.username
		const email = req.body.email
		const kind = req.body.kind
		const password = req.body.password

		console.log(`Someone wants to ${(kind ?? '???').toLowerCase()}: `, req.body)

		if (kind === 'Regisztráció') {
			if (username && password && email) {
				console.log(`Searching for user with email \"${email}\" and password \"${password}\" ...`)
				connection.query('SELECT * FROM accounts WHERE email = ? AND password = ?', [email, password], (error, results) => {
					if (error) {
						console.error(error)
						res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: error + '' }))
						res.end()
						return
					}
	
					if (results.length > 0) {
						console.log(`User with email \"${email}\" and password \"${password}\" found (already exists)`)
						res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'A felhasználó már létezik' }))
						res.end()
					} else {
						console.log(`User with email \"${email}\" and password \"${password}\" not found, registering ...`)
						connection.query('INSERT INTO accounts (`username`, `password`, `email`) VALUES (?, ?, ?)', [username, password, email], (error2) => {
							if (error2) {
								console.error(error2)
								res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: error2 + '' }))
								res.end()
								return
							}

							console.log(`User with email \"${email}\", name \"${username}\" and password \"${password}\" added (registered)`)
							req.session.loggedin = true
							req.session.email = email
							req.session.username = username
							res.redirect('/home')
						})
					}
				})
			} else {
				res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'Adjon meg egy felhasználónevet, email-t és jelszavat' }))
				res.end()
			}
		} else if (kind === 'Bejelentkezés') {
			if (password && email) {
				connection.query('SELECT * FROM accounts WHERE email = ? AND password = ?', [email, password], (error, results) => {
					if (error) {
						console.error(error)
						res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: error + '' }))
						res.end()
						return
					}
	
					if (results.length > 0) {
						console.log(`User logged in`)
				
						req.session.loggedin = true
						req.session.email = email
						req.session.username = username
						res.redirect('/home')
					} else {
						res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'Hibás jelszó vagy email' }))
					}			
					res.end()
				})
			} else {
				res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'Adjon meg egy email-t és jelszavat' }))
				res.end()
			}
		} else {
			res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'Bánszky valamit elrontott' }))
			res.end()
		}
	} catch (error) {
		console.error(error)
		res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: error + '' }))
		res.end()
	}
});

app.get('/home', (req, res) => {
	if (req.session.loggedin) {
		res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'hey.hbs'), 'utf8'))({ username: req.session.username }))
	} else {
		res.send(handlebars.compile(fs.readFileSync(path.join(dynPath, 'error.hbs'), 'utf8'))({ error: 'JELENTKEZZ BE!!!' }))
	}
	res.end()
})

app.listen(3000)