# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2018 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 logging
from struct import pack, unpack

from .tcp_abridged import TCP

log = logging.getLogger(__name__)


class TCPIntermediate(TCP):
    def __init__(self):
        super().__init__()
        self.is_first_packet = None

    def connect(self, address: tuple):
        super().connect(address)
        self.is_first_packet = True
        log.info("Connected!")

    def send(self, data: bytes):
        length = len(data)
        data = pack("<i", length) + data

        if self.is_first_packet:
            data = b"\xee" * 4 + data
            self.is_first_packet = False

        super().sendall(data)

    def recv(self) -> bytes or None:
        length = self.recvall(4)

        if length is None:
            return None

        packet = self.recvall(unpack("<I", length)[0])

        return packet