"""Redis 连接与缓存工具。"""

import json
import logging
from typing import Any

from app.core.config import settings

logger = logging.getLogger(__name__)

try:
    import redis.asyncio as redis
    _redis_client = redis.from_url(settings.redis_url, decode_responses=True)
except ImportError:
    _redis_client = None
    logger.warning("redis 未安装，缓存功能不可用")


async def cache_get(key: str) -> Any | None:
    """从 Redis 获取缓存。"""
    if not _redis_client:
        return None
    try:
        data = await _redis_client.get(key)
        return json.loads(data) if data else None
    except Exception:
        return None


async def cache_set(key: str, value: Any, ttl: int = 300) -> None:
    """设置 Redis 缓存。"""
    if not _redis_client:
        return
    try:
        await _redis_client.setex(key, ttl, json.dumps(value, default=str))
    except Exception:
        pass


async def cache_delete(key: str) -> None:
    """删除 Redis 缓存。"""
    if not _redis_client:
        return
    try:
        await _redis_client.delete(key)
    except Exception:
        pass