import asyncio
from typing import Awaitable, Callable


_queue: asyncio.Queue = asyncio.Queue()
_current_label: str | None = None


async def enqueue(label: str, job: Callable[[], Awaitable[None]]) -> int:
    await _queue.put((label, job))
    return _queue.qsize()


async def worker():
    global _current_label
    while True:
        label, job = await _queue.get()
        _current_label = label
        try:
            await job()
        finally:
            _current_label = None
            _queue.task_done()


def format_status() -> str:
    pending = [label for label, _ in list(_queue._queue)]
    lines = ["🧾 Queue"]
    lines.append(f"🔄 Running: {_current_label or 'idle'}")
    lines.append(f"⏳ Pending: {len(pending)}")
    if pending:
        preview = ", ".join(pending[:5])
        lines.append(f"➡️ Next: {preview}")
    return "\n".join(lines)