import asyncio
from asyncio.streams import StreamReader, StreamWriter
import logging
import os

from paircd.client import Client
from paircd.handlers import handle_cmd, register_cmd_handlers
from paircd.message import parse_message
from paircd.server import Server

logging.basicConfig(
    format="%(asctime)s [%(levelname)s] - %(message)s", level=logging.INFO
)

logger = logging.getLogger()


async def read_forever(server: Server, client: Client) -> None:
    while True:
        raw_msg = await client.reader.readuntil(b"\r\n")
        msg = parse_message(raw_msg)
        await handle_cmd(server, client, msg)


async def serve() -> None:
    bind_addr = os.getenv("BIND_ADDR") or "0.0.0.0"
    port = os.getenv("PORT") or 6667

    irc_server = Server()
    register_cmd_handlers()

    async def register_client(reader: StreamReader, writer: StreamWriter) -> None:
        client = Client(
            hostname=writer.get_extra_info("peername")[0],
            reader=reader,
            writer=writer,
        )
        asyncio.create_task(read_forever(irc_server, client))
        asyncio.create_task(client.write_forever())

    server = await asyncio.start_server(
        register_client,
        bind_addr,
        port,
        reuse_port=True,
    )

    logger.info(f"Listening on {bind_addr}:{port}")
    async with server:
        await server.serve_forever()


def main() -> None:
    asyncio.run(serve())


if __name__ == "__main__":
    main()