# scopes.core.actor

import asyncio
from collections.abc import Awaitable, Callable
from typing import Any, Optional

from scopes.util import keywords as k

type Behavior = Callable[[Any], Awaitable[Behavior | None]]

async def loop(q: asyncio.Queue, bhv: Behavior) -> None:
    while True:
        msg = await q.get()
        if msg is k.quit:
            break
        bhv = await bhv(msg) or bhv

def create(bhv: Behavior, group: Optional[asyncio.TaskGroup] = None) -> asyncio.Queue:
    q: asyncio.Queue = asyncio.Queue()
    if group is None:
        asyncio.create_task(loop(q, bhv))
    else:
        group.create_task(loop(q, bhv))
    return q