# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>
#
# This file is part of Pyrogram.
#
# Pyrogram is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pyrogram is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.

import os

from pyrogram.api import functions, types
from .utils import compute_hash, btoi, itob
from ...ext import BaseClient


class EnableCloudPassword(BaseClient):
    async def enable_cloud_password(self,
                                    password: str,
                                    hint: str = "",
                                    email: str = None) -> bool:
        """Use this method to enable the Two-Step Verification security feature (Cloud Password) on your account.

        This password will be asked when you log-in on a new device in addition to the SMS code.

        Args:
            password (``str``):
                Your password.

            hint (``str``, *optional*):
                A password hint.

            email (``str``, *optional*):
                Recovery e-mail.

        Returns:
            True on success.

        Raises:
            :class:`Error <pyrogram.Error>` in case of a Telegram RPC error.
            ``ValueError`` in case there is already a cloud password enabled.
        """
        r = await self.send(functions.account.GetPassword())

        if r.has_password:
            raise ValueError("There is already a cloud password enabled")

        r.new_algo.salt1 += os.urandom(32)
        new_hash = btoi(compute_hash(r.new_algo, password))
        new_hash = itob(pow(r.new_algo.g, new_hash, btoi(r.new_algo.p)))

        await self.send(
            functions.account.UpdatePasswordSettings(
                password=types.InputCheckPasswordEmpty(),
                new_settings=types.account.PasswordInputSettings(
                    new_algo=r.new_algo,
                    new_password_hash=new_hash,
                    hint=hint,
                    email=email
                )
            )
        )

        return True