import asyncio
import logging
from datetime import datetime, timedelta, timezone

from ..db import (
    get_users_expiring_by,
    get_expired_users,
    get_user_contact,
    mark_expiry_warning_sent,
    mark_expiry_disabled,
    mark_expiry_deleted,
    set_user_blocked,
    delete_user,
)
from ..runtime import get_runtime_settings
from .notifications import send_notification

logger = logging.getLogger(__name__)


async def run_expiry_loop() -> None:
    while True:
        runtime = get_runtime_settings()
        now = datetime.now(timezone.utc)
        warn_days = int(runtime.expiry_warning_days or 0)
        if warn_days > 0:
            cutoff = (now + timedelta(days=warn_days)).isoformat()
            for user in get_users_expiring_by(cutoff):
                contact = get_user_contact(user["username"]) or {}
                email = contact.get("email")
                await send_notification(
                    "Account expiring soon",
                    f"Your account expires on {user['expires_at']}.",
                    channels=["email"] if email else [],
                    email=email,
                )
                mark_expiry_warning_sent(user["username"])
        for expired in get_expired_users(now.isoformat()):
            action = (expired.get("action") or "disable").lower()
            if action in {"disable", "disable_then_delete"}:
                set_user_blocked(expired["username"], True)
                mark_expiry_disabled(expired["username"])
            if action in {"delete", "disable_then_delete"}:
                delete_user(expired["username"])
                mark_expiry_deleted(expired["username"])
        delay = max(60, int(runtime.expiry_check_interval_minutes or 60) * 60)
        await asyncio.sleep(delay)