import enum
import socket
import threading

from typing import Callable

from nntp.tiny.newsgroup import Newsgroup
from nntp.tiny.session   import Session

class ServerCapability(enum.Flag):
    NONE = 0
    AUTH = enum.auto()
    POST = enum.auto()

class Server():
    def __init__(self, connect_to_db: Callable):
        self.connect_to_db = connect_to_db
        self.capabilities  = ServerCapability.NONE
        self.newsgroups    = dict()

        self._init_newsgroups()

    def _init_newsgroups(self):
        db = self.connect_to_db()

        for newsgroup in db.query(Newsgroup).each():
            self.newsgroups[newsgroup.name.casefold()] = newsgroup

    def run(self):
        listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        listener.bind(('localhost', 1190))
        listener.listen()

        while True:
            sock, addr = listener.accept()

            def spawn():
                session = Session(self, sock)
                session.handle()

            thread = threading.Thread(target=spawn)
            thread.start()

        listener.close()