# scopes.core.actor

import asyncio

QUIT = object()

async def loop(q, bhv):
    while True:
        msg = await q.get()
        if msg == QUIT:
            break
        bhv = await bhv(msg) or bhv

def create(bhv):
    q = asyncio.Queue()
    task = asyncio.create_task(loop(q, bhv))
    return q, task

# interactive tests

async def handle_basic(msg):
    match msg[0]:
        case "show": show(msg)
        case "switch": return handle_alt
        case _: show(msg)

async def handle_alt(msg):
    await asyncio.sleep(0.01)
    match msg[0]:
        case "show": print('no way')
        case _: show(msg)

def show(msg):
    print(msg)

async def main():
    q, task = create(handle_basic)
    await q.put(["Hello World!"])
    await q.put(["switch"])
    await q.put(["show", "nope"])
    await q.put(["Hello World!"])
    await q.put(QUIT)
    #await task
    await asyncio.wait([task])
    #await asyncio.sleep(10)

def run():
    asyncio.run(main())