#!/usr/bin/env python3
"""
ZMQ network layer for QLPyCon
Handles RCON and stats stream connections
"""

import zmq
import struct
import logging
import time

logger = logging.getLogger('network')


def read_socket_event(msg):
    """Parse ZMQ socket monitor event"""
    event_id = struct.unpack('<H', msg[:2])[0]
    event_names = {
        zmq.EVENT_ACCEPTED: 'EVENT_ACCEPTED',
        zmq.EVENT_ACCEPT_FAILED: 'EVENT_ACCEPT_FAILED',
        zmq.EVENT_BIND_FAILED: 'EVENT_BIND_FAILED',
        zmq.EVENT_CLOSED: 'EVENT_CLOSED',
        zmq.EVENT_CLOSE_FAILED: 'EVENT_CLOSE_FAILED',
        zmq.EVENT_CONNECTED: 'EVENT_CONNECTED',
        zmq.EVENT_CONNECT_DELAYED: 'EVENT_CONNECT_DELAYED',
        zmq.EVENT_CONNECT_RETRIED: 'EVENT_CONNECT_RETRIED',
        zmq.EVENT_DISCONNECTED: 'EVENT_DISCONNECTED',
        zmq.EVENT_LISTENING: 'EVENT_LISTENING',
        zmq.EVENT_MONITOR_STOPPED: 'EVENT_MONITOR_STOPPED',
    }
    event_name = event_names.get(event_id, f'{event_id}')
    event_value = struct.unpack('<I', msg[2:])[0]
    return (event_id, event_name, event_value)


def check_monitor(monitor):
    """Check monitor socket for events"""
    try:
        event_monitor = monitor.recv(zmq.NOBLOCK)
    except zmq.Again:
        return None
    
    event_id, event_name, event_value = read_socket_event(event_monitor)
    event_endpoint = monitor.recv(zmq.NOBLOCK)
    logger.debug(f'Monitor: {event_name} {event_value} endpoint {event_endpoint}')
    return (event_id, event_value)


class RconConnection:
    """RCON connection to Quake Live server"""
    
    def __init__(self, host, password, identity):
        self.host = host
        self.password = password
        self.identity = identity
        self.context = None
        self.socket = None
        self.monitor = None
    
    def connect(self):
        """Initialize connection"""
        logger.info('Initializing ZMQ context...')
        self.context = zmq.Context()
        
        logger.info('Creating DEALER socket...')
        self.socket = self.context.socket(zmq.DEALER)
        
        logger.info('Setting up socket monitor...')
        self.monitor = self.socket.get_monitor_socket(zmq.EVENT_ALL)
        
        if self.password:
            logger.info('Setting password for access')
            self.socket.plain_username = b'rcon'
            self.socket.plain_password = self.password.encode('utf-8')
            self.socket.zap_domain = b'rcon'
        
        logger.info(f'Setting socket identity: {self.identity}')
        self.socket.setsockopt(zmq.IDENTITY, self.identity.encode('utf-8'))
        
        self.socket.connect(self.host)
        logger.info('Connection initiated, waiting for events...')
    
    def send_command(self, command):
        """Send RCON command"""
        if isinstance(command, str):
            command = command.encode('utf-8')
        self.socket.send(command)
        logger.info(f'Sent command: {command}')
    
    def poll(self, timeout):
        """Poll for messages"""
        return self.socket.poll(timeout)
    
    def recv_message(self):
        """Receive a message (non-blocking)"""
        try:
            return self.socket.recv(zmq.NOBLOCK).decode('utf-8', errors='replace')
        except zmq.error.Again:
            return None
    
    def check_monitor(self):
        """Check monitor for events"""
        return check_monitor(self.monitor)
    
    def close(self):
        """Close connection"""
        if self.socket:
            self.socket.setsockopt(zmq.LINGER, 0)  # Don't wait for unsent messages
            self.socket.close()
        if self.context:
            self.context.term()


class StatsConnection:
    """Stats stream connection (ZMQ SUB socket)"""
    
    def __init__(self, host, port, password):
        self.host = host
        self.port = port
        self.password = password
        self.context = None
        self.socket = None
        self.connected = False
    
    def connect(self):
        """Connect to stats stream"""
        stats_host = f'tcp://{self.host}:{self.port}'
        logger.info(f'Connecting to stats stream: {stats_host}')
        
        self.context = zmq.Context()
        self.socket = self.context.socket(zmq.SUB)
        logger.debug('Stats socket created (SUB type)')
        
        if self.password and self.password.strip():
            logger.debug('Setting PLAIN authentication')
            self.socket.setsockopt(zmq.PLAIN_USERNAME, b'stats')
            self.socket.setsockopt(zmq.PLAIN_PASSWORD, self.password.encode('utf-8'))
            self.socket.setsockopt_string(zmq.ZAP_DOMAIN, 'stats')
        
        logger.debug(f'Connecting to {stats_host}')
        self.socket.connect(stats_host)
        
        logger.debug('Setting ZMQ_SUBSCRIBE to empty (all messages)')
        self.socket.setsockopt(zmq.SUBSCRIBE, b'')
        
        time.sleep(0.5)
        self.connected = True
        logger.info('Stats stream connected')
    
    def recv_message(self):
        """Receive stats message (non-blocking)"""
        if not self.connected:
            return None
        
        try:
            msg = self.socket.recv(zmq.NOBLOCK)
            return msg.decode('utf-8', errors='replace')
        except zmq.error.Again:
            return None
    
    def close(self):
        """Close connection"""
        if self.socket:
            self.socket.setsockopt(zmq.LINGER, 0)  # Don't wait for unsent messages
            self.socket.close()
        if self.context:
            self.context.term()