from asyncio import Queue
from dataclasses import dataclass, field
from typing import Dict, List

from paircd.client import Client
from paircd.message import Message


@dataclass
class Channel:
    name: str
    clients_by_nick: Dict[str, Client] = field(default_factory=dict)
    msg_queue: Queue = field(default_factory=Queue)

    def add_client(self, client: Client) -> None:
        self.clients_by_nick[client.nickname] = client

    def remove_client_by_nick(self, nick: str) -> None:
        del self.clients_by_nick[nick]

    async def process(self) -> None:
        while True:
            msg = await self.msg_queue.get()
            for client in self.clients_by_nick.values():
                # Don't broadcast client's messages back to themselves
                if msg.cmd == "PRIVMSG" and msg.prefix == client.id():
                    continue
                client.write_message(msg)

    def write_message(self, msg: Message) -> None:
        self.msg_queue.put_nowait(msg)

    def get_modes(self) -> List[str]:
        return []