import bcrypt from 'bcrypt'
import crypto from 'crypto'
import { Router } from 'express'
import { glauth } from '../libs/database.js'
import execawait from '../libs/execawait.js'

const AUTH = Router()
let valid = {}


AUTH.post('/register', (req, res) => {
    const { captcha, password, username } = req.body

    // Was input sent?
    if (!username || !password || !captcha)
        return(res.send(`Not entered:${username ? '' : ' username,'}${password ? '' : ' password,'}${captcha ? '' : ' captcha'}`))

    // is captcha valid
    if (!valid[captcha])
        return(res.send("Invalid captcha!"))

    const captchaAge = Math.abs((valid[captcha].getTime() - new Date().getTime())/1000)

    if (captchaAge > 600)
        return(res.send("Invalid captcha!"))

    // expire the captcha
    delete valid[captcha]

    // does the username match the requirements
    if (!(/^(?=[a-zA-Z0-9]{2,20}$).*$/.test(username)))
        return(res.send("Username does not match the requirements"))

    if (glauth.prepare(`SELECT * FROM users WHERE name = ?`).get(username))
        return(res.send("User already exists"))

    bcrypt.hash(password, 10).then(
        hash => {
            glauth.prepare(`
                INSERT INTO users(
                    name, primarygroup, passbcrypt
                ) VALUES(?, 0, ?)
            `).run(username, hash)

            res.send("Account registered!")
        }
    )
})

AUTH.post('/login', (req, res) => {
    const { password, username } = req.body

    // Was input sent?
    if (!username || !password )
        return(res.send(`Not entered:${username ? '' : ' username,'}${password ? '' : ' password'}`))

    const user = glauth.prepare(`SELECT * FROM users WHERE name = ?`).get(username)

    if (!user)
        return(res.send("User doesn't exist!"))

    bcrypt.compare(password, user.passbcrypt).then(
        match => {
            if (!match)
                return res.send("Password's is incorrect!")

            return res.send("Welcome " + user.name + "!")
        }
    )
})

AUTH.get('/captcha', async (req, res) => {
    const captcha = crypto.randomBytes(3).toString('hex')
    execawait(`./captcha.sh ${captcha} > captcha.png`)
        .then(() => {
            // Make it valid for 10 minutes
            valid[captcha] = new Date()
        
            // Send the captcha image
            res.contentType('image/png')
                .sendFile('captcha.png', { root: './' })
        })
        .catch(() => res.status(501).send("ERROR! Failed to generate captcha."))
})


export default AUTH