import asyncio
import logging
import os
import uuid
import json

import redis
from Config.Config import REDIS_HOST, REDIS_PORT, REDIS_DB, REDIS_PASSWORD, REDIS_DECODE_RESPONSES
# 创建logger实例
logger = logging.getLogger(__name__)

class RedisKit:
    """
    异步Redis工具类，提供所有Redis操作的异步实现
    单例模式确保全局只有一个Redis连接池
    """
    _instance = None
    _lock = asyncio.Lock()
    _redis_pool = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
        return cls._instance

    async def _ensure_pool(self):
        """
        确保Redis连接池已创建
        """
        if RedisKit._redis_pool is None:
            async with RedisKit._lock:
                if RedisKit._redis_pool is None:
                    try:
                        # 创建同步Redis连接池
                        sync_pool = redis.ConnectionPool(
                            host=REDIS_HOST,
                            port=REDIS_PORT,
                            db=REDIS_DB,
                            password=REDIS_PASSWORD,
                            decode_responses=REDIS_DECODE_RESPONSES
                        )
                        # 创建Redis连接实例
                        RedisKit._redis_pool = redis.Redis(
                            connection_pool=sync_pool,
                            encoding='utf-8',
                            decode_responses=REDIS_DECODE_RESPONSES
                        )
                        # 测试连接
                        await asyncio.to_thread(RedisKit._redis_pool.ping)
                        logger.info("Redis连接池创建成功")
                    except Exception as e:
                        logger.error(f"Redis连接池创建失败: {e}")
                        raise

    async def get_connection(self):
        """
        获取Redis连接实例
        
        Returns:
            redis.Redis: Redis连接实例
        """
        await self._ensure_pool()
        return RedisKit._redis_pool

    async def get_data(self, key):
        """
        异步从Redis中获取数据

        Args:
            key (str): Redis键名

        Returns:
            any: Redis中存储的值，如果键不存在则返回None
        """
        try:
            await self._ensure_pool()
            return await asyncio.to_thread(RedisKit._redis_pool.get, key)
        except Exception as e:
            logger.error(f"从Redis获取数据失败(key={key}): {e}")
            return None

    async def exists(self, key):
        """
        异步检查Redis键是否存在
        
        Args:
            key (str): Redis键名
        
        Returns:
            bool: 键存在返回True，不存在或失败返回False
        """
        try:
            await self._ensure_pool()
            result = await asyncio.to_thread(RedisKit._redis_pool.exists, key)
            return bool(result)
        except Exception as e:
            logger.error(f"检查Redis键是否存在失败(key={key}): {e}")
            return False

    async def set_data(self, key, value, expire=None):
        """
        异步保存数据到Redis
        
        Args:
            key (str): Redis键名
            value (any): 要保存的值
            expire (int, optional): 过期时间（秒）
        """
        try:
            await self._ensure_pool()
            if expire:
                 await asyncio.to_thread(RedisKit._redis_pool.set, key, value, ex=expire)
            else:
                 await asyncio.to_thread(RedisKit._redis_pool.set, key, value)
            return True
        except Exception as e:
            logger.error(f"保存数据到Redis失败(key={key}): {e}")
            return False

    async def close(self):
        """
        关闭Redis连接池
        """
        if RedisKit._redis_pool is not None:
            try:
                # redis-py 4.x+ supports close()
                await asyncio.to_thread(RedisKit._redis_pool.close)
                RedisKit._redis_pool = None
                logger.info("Redis连接池已关闭")
            except Exception as e:
                logger.error(f"关闭Redis连接池失败: {e}")

    async def delete_data(self, key):
        """
        异步删除Redis中的数据
        
        Args:
            key (str): Redis键名
        """
        try:
            await self._ensure_pool()
            await asyncio.to_thread(RedisKit._redis_pool.delete, key)
            return True
        except Exception as e:
            logger.error(f"从Redis删除数据失败(key={key}): {e}")
            return False

# ȫ��ʵ��
redisKit = RedisKit()