import sys
import time
from mnemonic import Mnemonic

if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("Suggested usage: rng-mnemonic <keys number> ")
        sys.exit(0)

    try:
        n = int(sys.argv[1])
    except ValueError:
        print("Keys number must be integer")

    #OneRNG provides instructions about generator availability and activity
    #other way to ensure RNG is working is to call cat /dev/random > /dev/null in bash
    print("Checking generator. Look at the LED")
    time.sleep(1.)
    with open('/dev/random', 'rb') as rnd:
        rnd.read(1024*16)
    time.sleep(1.)

    #real generation
    with open('/dev/random', 'rb') as rnd:
        for i in range(0, n):
            print("\nKey: {}".format(i))
            m = Mnemonic("english")
            print("Mnemonic: {}".format(m.to_mnemonic(rnd.read(32))))
    print("Completed")