# scopes.core.core

"""A concurrent cybernetic communication system"""

from __future__ import annotations  # no check of type annotations at runtime
import asyncio
from collections.abc import AsyncGenerator, Callable, Coroutine
from dataclasses import dataclass, field
from typing import Any

from scopes.core.message import Message
from scopes.util import keywords as k, Symbol

type Mailbox = asyncio.Queue
type Categ = tuple[Symbol, Symbol]
type Proc = Callable[[Scope, Message], AsyncGenerator[Scope]]
type Program = Callable[[Scope], Proc]
type Syn = Callable[[Message], Message]

async def proc_dummy(scope: Scope, msg: Message) -> AsyncGenerator[Scope]:
    yield scope

@dataclass
class Scope:

    value: Any = 0
    categ: Categ = (k.csys, k.c00)
    stage: Symbol = k.initial
    proc: Proc = proc_dummy
    program: Program = lambda x: proc_dummy
    syns: list[Syn] = field(default_factory=list)
    environ: Mailbox = field(default_factory=asyncio.Queue)

    def set_proc(self) -> Scope:
        self.proc = self.program(self)
        return self

def create_scope(env: Mailbox, cat=(k.csys, k.c00), **kw):
    scope = Scope(environ=env, categ=cat, **kw)
    return scope.set_proc()