import hmac
import hashlib
import os

import settings


def _generate_hash(telegram_data: dict):
    data = telegram_data.copy()
    del data['hash']
    keys = sorted(data.keys())
    string_arr = []
    for key in keys:
        if data[key] is not None:
            string_arr.append(key + '=' + str(data[key]))
    string_cat = '\n'.join(string_arr)

    secret_key = hashlib.sha256(settings.TELEGRAM_BOT_TOKEN.encode('utf-8')).digest()
    hash_bytes = bytes(string_cat, 'utf-8')
    hmac_hash = hmac.new(secret_key, hash_bytes, hashlib.sha256).hexdigest()
    return hmac_hash


def telegram_authorize(telegram_data: dict):
    generated_hash = _generate_hash(telegram_data)
    user_hash = telegram_data['hash']
    return generated_hash == user_hash