#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
Very simple multithreading.
Multiple TCP clients to connect to one server.

@author: taylor@mst.edu
"""

import socket
import threading


def handler(client_socket: socket.socket, address: tuple[str, int]) -> None:
    """
    Handles the part of the client work-flow that is client-dependent,
    and thus may be delayed (blocking program flow).
    """
    while True:
        msg = client_socket.recv(1024)
        if not msg:
            break
        print(address, " sent message: ", msg)
        client_socket.send(msg)
        if msg.decode() == "quit":
            break
    print("server closing client socket, finishing one thread")
    client_socket.close()


def main() -> None:
    s = socket.socket()
    port = 50002

    print("Server started!")
    print("Waiting for clients...")

    s.bind(("", port))
    s.listen(5)

    threads = []
    try:
        while True:
            # This is the part that is not dependent on the client,
            # and therefore happens quickly (not blocking program flow).
            c, addr = s.accept()
            print("Got connection from", addr)
            new_thread = threading.Thread(target=handler, args=(c, addr))
            new_thread.start()
            threads.append(new_thread)
            print(threads)
    except KeyboardInterrupt as err:
        print("you pressed ctrl-c", err)

    s.close()


if __name__ == "__main__":
    main()