"""Monitor helper for heartbeat daemon.

This module provides monitoring tasks for the heartbeat daemon.
The primary reachability monitoring is now event-driven (timers set/reset 
on HTB arrival in udp.py) rather than periodic polling.

This module can be extended for additional monitoring tasks.
"""

from __future__ import annotations
import asyncio
import time
from . import notify as notify_mod

DROPOVERDUE = 7 * 24 * 3600
eventlog = notify_mod.eventlog


async def cleanup_connections(hbdclass):
    """Clean up connection timers on shutdown.
    
    Cancels all active overdue timers to prevent callbacks after shutdown.
    """
    for hostname, host in list(hbdclass.Host.hosts.items()):
        for conn_type, conn in host.connections.items():
            if hasattr(conn, 'cancel_overdue_timer'):
                conn.cancel_overdue_timer()


async def start(
    config: dict,
    hbdclass: callable,
    pushmsg=None,
    msg_to_websockets=None,
):
    """Start monitor background tasks.
    
    Note: Reachability monitoring is now timer-based and happens in udp.py
    when HTB messages arrive. This function can be used for additional
    monitoring tasks.
    
    Currently runs a simple status logger every 5 minutes.
    """
    import logging
    logger = logging.getLogger(__name__)
    logger_interval = 300  # Log status every 5 minutes
    
    while True:
        await asyncio.sleep(logger_interval)
        
        # Log monitoring status
        total_hosts = len(hbdclass.Host.hosts)
        up_count = sum(
            1 for h in hbdclass.Host.hosts.values()
            for c in h.connections.values()
            if c.state == hbdclass.Connection.UP
        )
        overdue_count = sum(
            1 for h in hbdclass.Host.hosts.values()
            for c in h.connections.values()
            if c.state == hbdclass.Connection.OVERDUE
        )
        
        logger.debug(
            f"Monitor status: {total_hosts} hosts, {up_count} UP, {overdue_count} OVERDUE"
        )