#!/usr/bin/python3

import sqlite3
import re
from onetimepass import valid_totp
from secrets import choice
import segno
from os import path
import uuid

class Tools():
    
    def __init__(self):        
        self.username = ''

    #check code
    def code_is_valid(self, code, db):
        con = sqlite3.connect(db)
        cur = con.cursor()

        codes=[]
        for row in cur.execute('SELECT * FROM codes WHERE valid = 1'):
            codes.append(row[0])
        return(bool(code in codes))

    def mark_code_as_used(self, code, db):
        con = sqlite3.connect(db)
        cur = con.cursor()

        cur.execute('''UPDATE codes SET valid=? WHERE code==?''',(0, code))
        con.commit()

    #form validation

    def input_validation(self, e, ws=None):
        if ws:
            #accepts whitespaces
            regex = r'^\w+( \w+)*$'
        else:
            regex = r'^\w+$'
        return(bool(re.fullmatch(regex, e)))

    def email_validation(self, e):
        regex = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
        return(bool(re.fullmatch(regex, e)))

    def pwd_validation(self, e):
        regex = r'^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!#%*?&]{8,18}$'
        return(bool(re.fullmatch(regex, e)))
    
    # 2FA
    def gen_qr(self, secret):
        if(not path.isfile('static/tmp/'+secret+'.png')):
            qrcode = segno.make(secret, micro=False)
            qrcode.save('static/tmp/'+secret+'.png', scale=10)

    def gen_secret(self):  # Function to return a random string with length 16.
        secret = ''
        while len(secret) < 16:
            secret += choice('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567')
        self.gen_qr(secret)
        return secret

    def _2fa_validation(self, otp, secret):
        authenticated = valid_totp(otp, secret)
        if authenticated:
            print('Correct otp, Authenticated!')
            return True
        elif not authenticated:
            print('Wrong otp, please try again.')
            return False

    def session_id(self):
        return uuid.uuid4().hex

tools = Tools()