from logging import WARN
from paircd.handler.away import AwayHandler
from typing import Dict

from paircd.client import Client
from paircd.command_handler import CommandHandler
from paircd.message import Message
from paircd.server import Server

from paircd.handler.join import JoinHandler
from paircd.handler.mode import ModeHandler
from paircd.handler.nick import NickHandler
from paircd.handler.ping import PingHandler
from paircd.handler.privmsg import PrivmsgHandler
from paircd.handler.user import UserHandler
from paircd.handler.who import WhoHandler

HANDLER_CLASSES = [
    AwayHandler,
    JoinHandler,
    ModeHandler,
    NickHandler,
    PingHandler,
    PrivmsgHandler,
    UserHandler,
    WhoHandler,
]

CMD_HANDLERS: Dict[str, CommandHandler] = {}


def register_cmd_handlers() -> None:
    for handler_cls in HANDLER_CLASSES:
        handler = handler_cls()  # type: ignore
        CMD_HANDLERS[handler.cmd] = handler


async def handle_cmd(server: Server, client: Client, msg: Message) -> None:
    cmd = msg.cmd.upper()
    if cmd not in CMD_HANDLERS:
        client.log(f"used unknown command {cmd}", level=WARN)
        return

    handler = CMD_HANDLERS[cmd]
    if handler.argc is not None and handler.argc != len(msg.args):
        client.log(
            "got {len(msg.args)} arguments for {msg.cmd}, expected {handler.argc}",
            level=WARN,
        )
        return

    await handler.handle(server, client, msg)