import logging
from datetime import datetime
from typing import Dict, List, Optional
from opnsense_api import OPNsenseAPI
from database import Database
from email_handler import EmailHandler

logger = logging.getLogger(__name__)

class OPNsenseMonitor:
    """Monitor OPNsense events"""
    
    def __init__(self, config: Dict, db: Database, email_handler: Optional[EmailHandler]):
        self.config = config
        self.db = db
        self.email_handler = email_handler
        
        # Initialize API client
        opn_config = config['opnsense']
        self.api = OPNsenseAPI(
            host=opn_config['host'],
            api_key=opn_config['api_key'],
            api_secret=opn_config['api_secret'],
            verify_ssl=opn_config['verify_ssl']
        )
        
        # Previous states
        self.previous_leases = {}
        self.previous_devices = {}
        self.previous_interfaces = {}
        self.previous_gateways = {}
        
        logger.info("OPNsense Monitor initialized")
    
    def check_all(self):
        """Check all monitored events"""
        logger.debug("Starting monitoring cycle")
        
        events_config = self.config['monitoring']['events']
        
        try:
            if events_config.get('dhcp_leases'):
                self.check_dhcp_leases()
            
            if events_config.get('new_devices'):
                self.check_new_devices()
            
            if events_config.get('interface_status'):
                self.check_interface_status()
            
            if events_config.get('gateway_status'):
                self.check_gateway_status()
                
        except Exception as e:
            logger.error(f"Error in monitoring cycle: {e}", exc_info=True)
    
    def check_dhcp_leases(self):
        """Check for new DHCP leases"""
        leases = self.api.get_dhcp_leases()
        if not leases:
            return
        
        monitored_interfaces = self.config['monitoring'].get('monitored_interfaces', [])
        
        for lease in leases:
            lease_id = lease.get('address', '') + lease.get('mac', '')
            interface = lease.get('if', '')
            
            # Filter by interface if specified
            if monitored_interfaces and interface not in monitored_interfaces:
                continue
            
            if lease_id not in self.previous_leases:
                # New lease detected
                event = {
                    'type': 'dhcp_lease',
                    'interface': interface,
                    'ip': lease.get('address'),
                    'mac': lease.get('mac'),
                    'hostname': lease.get('hostname', 'Unknown'),
                    'details': f"New DHCP lease: {lease.get('address')} ({lease.get('hostname', 'Unknown')})"
                }
                
                self.db.add_event(event)
                logger.info(f"New DHCP lease: {event['details']}")
                
                if self.email_handler:
                    self.email_handler.send_event_notification(event)
        
        # Update previous state
        self.previous_leases = {lease.get('address', '') + lease.get('mac', ''): lease for lease in leases}
    
    def check_new_devices(self):
        """Check for new devices via ARP table"""
        arp_entries = self.api.get_arp_table()
        if not arp_entries:
            return
        
        monitored_interfaces = self.config['monitoring'].get('monitored_interfaces', [])
        
        for entry in arp_entries:
            mac = entry.get('mac', '')
            interface = entry.get('intf', '')
            
            # Filter by interface
            if monitored_interfaces and interface not in monitored_interfaces:
                continue
            
            if mac and mac not in self.previous_devices:
                # Check if device is in known devices DB
                is_known = self.db.is_known_device(mac)
                
                event = {
                    'type': 'new_device',
                    'interface': interface,
                    'ip': entry.get('ip'),
                    'mac': mac,
                    'hostname': entry.get('hostname', 'Unknown'),
                    'known': is_known,
                    'details': f"{'Known' if is_known else 'Unknown'} device detected: {mac} ({entry.get('hostname', 'Unknown')})"
                }
                
                self.db.add_event(event)
                logger.info(f"New device: {event['details']}")
                
                if self.email_handler and not is_known:
                    # Only send email for unknown devices
                    self.email_handler.send_event_notification(event)
        
        # Update previous state
        self.previous_devices = {entry.get('mac', ''): entry for entry in arp_entries}
    
    def check_interface_status(self):
        """Check interface status changes"""
        interfaces = self.api.get_interfaces()
        if not interfaces:
            return
        
        monitored_interfaces = self.config['monitoring'].get('monitored_interfaces', [])
        
        for if_name, if_data in interfaces.items():
            # Filter by interface
            if monitored_interfaces and if_name not in monitored_interfaces:
                continue
            
            current_status = if_data.get('status', 'unknown')
            
            if if_name in self.previous_interfaces:
                previous_status = self.previous_interfaces[if_name].get('status', 'unknown')
                
                if current_status != previous_status:
                    event = {
                        'type': 'interface_status',
                        'interface': if_name,
                        'old_status': previous_status,
                        'new_status': current_status,
                        'details': f"Interface {if_name} changed: {previous_status} → {current_status}"
                    }
                    
                    self.db.add_event(event)
                    logger.warning(f"Interface status change: {event['details']}")
                    
                    if self.email_handler:
                        self.email_handler.send_event_notification(event)
        
        # Update previous state
        self.previous_interfaces = interfaces
    
    def check_gateway_status(self):
        """Check gateway status changes"""
        gateways = self.api.get_gateways()
        if not gateways:
            return
        
        for gw_name, gw_data in gateways.items():
            current_status = gw_data.get('status', 'unknown')
            
            if gw_name in self.previous_gateways:
                previous_status = self.previous_gateways[gw_name].get('status', 'unknown')
                
                if current_status != previous_status:
                    event = {
                        'type': 'gateway_status',
                        'gateway': gw_name,
                        'old_status': previous_status,
                        'new_status': current_status,
                        'details': f"Gateway {gw_name} changed: {previous_status} → {current_status}"
                    }
                    
                    self.db.add_event(event)
                    logger.warning(f"Gateway status change: {event['details']}")
                    
                    if self.email_handler:
                        self.email_handler.send_event_notification(event)
        
        # Update previous state
        self.previous_gateways = gateways