import Database from 'better-sqlite3'
import express from 'express'
import crypto from 'crypto'
import dotenv from 'dotenv'

import { exec } from 'child_process'

dotenv.config()

const app = express()
const port = process.env.PORT
let valid = {}
let glauth = undefined

console.log(process.env)

dbInit()

app.use(express.urlencoded({
    extended: true
}))

app.use(express.static('public'))

app.post('/register', (req, res) => {
    // Was input sent?
    if(!req.body.username)
        return(res.send("No username entered!"))

    if(!req.body.password)
        return(res.send("No password entered!"))

    if(!req.body.password)
        return(res.send("No captcha entered!"))

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

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

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

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

    // expire the captcha
    delete valid[req.body.captcha]

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

    // Create the user!
    glauth.prepare(`
        INSERT INTO users(
            name, primarygroup, passsha256
        ) VALUES(?, 0, ?)
    `).run(req.body.username, crypto.createHash('sha256').update(req.body.password).digest('hex'))

    console.log(`>>> User: ${req.body.username} was succesfully created!`)
    res.send("Account registered!")

    res.end()
})

app.get('/captcha', async (req, res) => {
    const captcha = crypto.randomBytes(3).toString('hex')
    await execawait(`./captcha.sh ${captcha} > captcha.png`)

    // Make it valid for 10 minutes
    valid[captcha] = new Date()

    // Send the captcha image
    res.contentType('image/png');
    res.sendFile('captcha.png', {
        root: './'
    });
})

app.listen(port);
console.log('Server started at http://localhost:' + port);


function execawait(cmd) {
    return new Promise((resolve, reject) => {
        exec(cmd, (error, stdout, stderr) => {
            if (error) {
                console.warn(error);
            }
            resolve(stdout ? stdout : stderr);
        });
    });7
}

function dbInit() {
    glauth = new Database(process.env.GLAUTH_DB, {})

    console.log(`Loaded in GLAuth - users.db`)
}