#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
WebSocket客户端模块
用于与平台建立WebSocket连接并处理通信
"""

import asyncio
import json
import logging
import websockets
from datetime import datetime
from urllib.parse import urlencode

from config import config

# 配置日志
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


class WebSocketClient:
    """WebSocket客户端类"""
    
    def __init__(self, relay_service):
        """
        初始化WebSocket客户端
        
        Args:
            relay_service: 中继器服务实例
        """
        self.relay_service = relay_service
        self.device_id = config._config.get('relay', {}).get('device_id', '1')
        self.host = config._config.get('websocket', {}).get('host', 'localhost')
        self.port = config._config.get('websocket', {}).get('port', 8086)
        self.timeout = config._config.get('websocket', {}).get('timeout', 5)
        self.websocket = None
        self.connected = False
        self.running = False
        
        logger.info(f"初始化WebSocket客户端: device_id={self.device_id}, host={self.host}, port={self.port}")
    
    async def connect(self):
        """建立WebSocket连接"""
        try:
            # 构建连接URL
            params = urlencode({'device_id': self.device_id})
            uri = f"ws://{self.host}:{self.port}/ws/device?{params}"
            
            logger.info(f"正在连接到平台: {uri}")
            
            # 建立WebSocket连接（移除了timeout参数以兼容新版本websockets库）
            self.websocket = await websockets.connect(uri)
            self.connected = True
            self.running = True
            
            logger.info("成功连接到平台")
            return True
            
        except Exception as e:
            logger.error(f"连接平台失败: {e}")
            self.connected = False
            return False
    
    async def disconnect(self):
        """断开WebSocket连接"""
        logger.info("断开WebSocket连接")
        self.running = False
        
        if self.websocket:
            await self.websocket.close()
            self.websocket = None
            
        self.connected = False
        logger.info("WebSocket连接已断开")
    
    async def send_message(self, message):
        """
        发送消息到平台
        
        Args:
            message (dict): 要发送的消息
        """
        if not self.connected or not self.websocket:
            logger.warning("WebSocket未连接，无法发送消息")
            return False
        
        try:
            message_str = json.dumps(message, ensure_ascii=False)
            await self.websocket.send(message_str)
            logger.debug(f"发送消息到平台: {message_str}")
            return True
        except Exception as e:
            logger.error(f"发送消息失败: {e}")
            # 连接可能已断开，更新状态
            self.connected = False
            return False
    
    async def listen(self):
        """监听平台消息"""
        if not self.connected or not self.websocket:
            logger.error("WebSocket未连接，无法监听消息")
            return
        
        logger.info("开始监听平台消息")
        
        try:
            async for message in self.websocket:
                try:
                    # 解析收到的消息
                    message_data = json.loads(message)
                    logger.info(f"收到平台消息: {message_data}")
                    
                    # 将消息传递给中继器服务处理
                    self.relay_service.handle_platform_command(message)
                    
                except json.JSONDecodeError as e:
                    logger.error(f"解析平台消息失败: {e}")
                except Exception as e:
                    logger.error(f"处理平台消息时发生错误: {e}")
                    
        except websockets.exceptions.ConnectionClosed:
            logger.warning("WebSocket连接已关闭")
            self.connected = False
        except Exception as e:
            logger.error(f"监听平台消息时发生错误: {e}")
            self.connected = False
    
    async def reconnect(self):
        """尝试重新连接到平台"""
        logger.info("尝试重新连接到平台...")
        reconnect_delay = 5  # 初始重连延迟（秒）
        max_delay = 60  # 最大重连延迟（秒）
        
        while self.running and not self.connected:
            try:
                await self.connect()
                if self.connected:
                    logger.info("重新连接成功")
                    return True
                else:
                    logger.warning(f"重新连接失败，{reconnect_delay}秒后重试...")
                    await asyncio.sleep(reconnect_delay)
                    # 指数退避，但不超过最大延迟
                    reconnect_delay = min(reconnect_delay * 2, max_delay)
            except Exception as e:
                logger.error(f"重新连接时发生错误: {e}")
                await asyncio.sleep(reconnect_delay)
    
    def is_connected(self):
        """检查是否已连接"""
        return self.connected