from __future__ import annotations

import logging
from typing import TYPE_CHECKING

from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.triggers.interval import IntervalTrigger

if TYPE_CHECKING:
    from channels.whatsapp_channel import WhatsAppChannel

logger = logging.getLogger(__name__)

_scheduler: AsyncIOScheduler | None = None
_whatsapp: "WhatsAppChannel | None" = None


def build_scheduler(whatsapp: "WhatsAppChannel") -> AsyncIOScheduler:
    global _scheduler, _whatsapp
    _whatsapp = whatsapp

    _scheduler = AsyncIOScheduler(timezone="UTC")

    # WhatsApp-Polling alle 5 Sekunden (Green API erlaubt 100 req/s)
    _scheduler.add_job(
        _poll_whatsapp,
        trigger=IntervalTrigger(seconds=5),
        id="whatsapp-poll",
        name="WhatsApp incoming messages",
        max_instances=1,
        coalesce=True,
        misfire_grace_time=5,
    )

    return _scheduler


async def _poll_whatsapp() -> None:
    if _whatsapp:
        await _whatsapp.poll_incoming()