import logging
from paircd.reply import RPL_ENDOFWHO, RPL_WHOREPLY

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


class WhoHandler(CommandHandler):
    def __init__(self) -> None:
        super().__init__("WHO", 1)

    async def handle(self, server: Server, client: Client, msg: Message) -> None:
        name = msg.args[0]
        if not name.startswith("#"):
            client.log("used WHO on invalid channel", level=logging.WARN)
            self.who_end(client, name)
            return

        if name not in client.channels:
            client.log("client used WHO outside of channel", level=logging.WARN)
            self.who_end(client, name)
            return

        channel = server.get_channel_by_name(name)
        for member in channel.clients_by_nick.values():
            self.who_reply(client, name, member)
        self.who_end(client, name)

    def who_reply(self, client: Client, channel_name: str, member: Client) -> None:
        msg = RPL_WHOREPLY(
            client.nickname,
            channel_name,
            member.username,
            member.hostname,
            "localhost",  # server
            member.nickname,
            # TODO: Implement
            "H",  # H = here, G = gone
            "0",  # hop count
            member.realname,
        )
        client.write_message(msg)

    def who_end(self, client: Client, channel_name: str) -> None:
        msg = RPL_ENDOFWHO(client.nickname, channel_name)
        client.write_message(msg)