# Copyright (C) 2020 by eichhornchen, ÿnérant
# SPDX-License-Identifier: GPL-3.0-or-later

import socket
from argparse import ArgumentParser
from typing import Any, Tuple


class Squinnondation:
    args: Any
    bind_address: str
    bind_port: int
    client_address: str
    client_port: int

    def parse_arguments(self) -> None:
        parser = ArgumentParser(description="MIRC client.")
        parser.add_argument('bind_address', type=str, default="localhost",
                            help="Address of the client.")
        parser.add_argument('bind_port', type=int, default=2500,
                            help="Port of the client. Must be between 1024 and 65535.")
        parser.add_argument('--client_address', type=str, default="localhost",
                            help="Address of the first neighbour.")
        parser.add_argument('--client_port', type=int, default=2500,
                            help="Port of the first neighbour. Must be between 1024 and 65535.")
        parser.add_argument('--bind-only', '-b', action='store_true',
                            help="Don't connect to another client, only listen to connections.")
        self.args = parser.parse_args()

        if not (1024 <= self.args.bind_port <= 65535) and (1024 <= self.args.client_port <= 65535):
            raise ValueError("Ports must be between 1024 and 65535.")

        self.bind_address = self.args.bind_address
        self.bind_port = self.args.bind_port
        self.client_address = self.args.client_address
        self.client_port = self.args.client_port

    @staticmethod
    def main() -> None:  # pragma: no cover
        instance = Squinnondation()
        instance.parse_arguments()

        squirrel = Squirrel(input("Enter your nickname: "), instance.bind_address, instance.bind_port)

        if not instance.args.bind_only:
            hazelnut = Hazelnut(address=instance.client_address, port=instance.client_port)
            squirrel.send_raw_data(hazelnut, b"Hello world!")

        while True:
            data, addr = squirrel.receive_raw_data()
            print("received message: %s" % data)
            # squirrel.send_raw_data(hazelnut, b"Hello squirrel!")


class Hazelnut:
    """
    A hazelnut is a connected client, with its socket.
    """
    def __init__(self, nickname: str = "anonymous", address: str = "localhost", port: int = 2500):
        self.nickname = nickname
        self.address = address
        self.port = port


class Squirrel(Hazelnut):
    """
    The squirrel is the user of the program. It can speak with other clients, that are called hazelnuts.
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.socket.bind((self.address, self.port))
        print(f"Listening on {self.address}:{self.port}")

    def send_raw_data(self, client: Hazelnut, data: bytes) -> int:
        """
        Send a raw packet to a client.
        """
        return self.socket.sendto(data, (client.address, client.port))

    def receive_raw_data(self) -> Tuple[bytes, Any]:
        """
        Receive a packet from the socket.
        TODO: Translate the address into the correct hazelnut.
        """
        return self.socket.recvfrom(1024)