import redis
import json
import requests
from typing import Optional

REDIS_HOST = "r-2zeitjlg0gdypzb4v6.redis.rds.aliyuncs.com"
REDIS_PORT = 6379
REDIS_TTL = 1800  # 30分钟

THIRD_PARTY_API = "http://eco.zhongsou.com/eco/user/user.redis.info.groovy"

try:
    redis_client = redis.Redis(host=REDIS_HOST, port=REDIS_PORT, decode_responses=True)
except Exception:
    redis_client = None


def get_app_user(token: str) -> Optional[dict]:
    """
    通过第三方 token 获取用户信息
    先查 Redis 缓存，未命中则调第三方接口并写入缓存

    Args:
        token: App 端传入的第三方 token

    Returns:
        用户信息字典，token 无效或接口异常时返回 None
    """
    cache_key = f"app_user:{token}"

    # 1. 查 Redis 缓存
    try:
        if redis_client:
            cached = redis_client.get(cache_key)
            if cached:
                return json.loads(cached)
    except Exception as e:
        print(f"Redis 读取失败，降级调第三方接口: {e}")

    # 2. 调第三方接口
    try:
        resp = requests.get(THIRD_PARTY_API, params={"token": token}, timeout=5)
        data = resp.json()

        if data.get("head", {}).get("status") != 200:
            return None

        body = data.get("body")
        if not body or not body.get("userId"):
            return None

        user_info = {
            "userId": body["userId"],
            "userName": body["userName"],
            "nickName": body["nickName"],
            "mobile": body["mobile"],
            "imageUrl": body.get("imageUrl", ""),
        }

        # 3. 写入 Redis 缓存
        try:
            if redis_client:
                redis_client.setex(cache_key, REDIS_TTL, json.dumps(user_info))
        except Exception as e:
            print(f"Redis 写入失败: {e}")

        return user_info

    except Exception as e:
        print(f"第三方接口调用失败: {e}")
        return None