const id = require('nanoid')
const read = require('read')
const clipboardy = require('clipboardy')
const crypt = require('crypto')
const fs = require('fs')
const algo = 'aes-256-ctr'

read(
    { prompt: 'Master key: ', silent: true },
    (err, key) => {
        if (err) {
            throw err;
            return;
        }

        init(key);
    }
)

function init(key) {
    read(
        { prompt: 'Choose action: \n1. Generate\n2. Store to clipboard' },
        (err, output) => {
            if (output == '1') {
                generateNew(key)
            } else if (output == '2') {
                storeToClipboard(key)
            } else {
                init(key);
            }
        }
    )
}

function generateNew(key) {
    read(
        { prompt: 'Slave key name: ' },
        (err, name) => {
            let cipher = crypt.createCipher(algo, key),
                encrypted = cipher.update(
                    id(24),
                    'utf8',
                    'hex'
                )

            encrypted += cipher.final('hex')

            // store to file
            fs.writeFileSync(
                __dirname + '/keys/' + md5(name),
                encrypted
            )
        }
    )
}

function storeToClipboard(key) {
    read(
        { prompt: 'Slave key name: ' },
        (err, name) => {
            let fc = fs.readFileSync(
                __dirname + '/keys/' + md5(name)
            ).toString()

            let decipher = crypt.createDecipher(algo, key)
            let crypted = decipher.update(
                fc, 'hex', 'utf8'
            )

            crypted += decipher.final('utf8')

            clipboardy.writeSync(crypted);
        }
    )
}

function md5(data) {
    return crypt.createHash('md5').update(data).digest("hex")
}