from typing import Optional
from pydantic import BaseModel
import httpx
import jwt
from .config import settings
from .logger import logger

# 本地JWT密钥（与auth.py保持一致）
LOCAL_JWT_SECRET = "shudao-local-jwt-secret-2024"


class TokenUserInfo(BaseModel):
    user_id: int
    username: str
    account: str
    role: str = "user"  # 默认角色为user


def verify_local_token(token: str) -> Optional[TokenUserInfo]:
    """验证本地JWT Token"""
    try:
        payload = jwt.decode(token, LOCAL_JWT_SECRET, algorithms=["HS256"])
        
        # 检查是否是本地token
        if payload.get("source") != "local":
            return None
        
        logger.info(f"本地Token验证成功: user_id={payload.get('user_id')}, username={payload.get('username')}")
        
        return TokenUserInfo(
            user_id=payload.get("user_id"),
            username=payload.get("username", ""),
            account=payload.get("username", ""),  # 本地登录使用username作为account
            role=payload.get("role", "user")  # 从JWT中提取角色
        )
    except jwt.ExpiredSignatureError:
        logger.warning("本地Token已过期")
        return None
    except jwt.InvalidTokenError as e:
        logger.debug(f"本地Token验证失败: {e}")
        return None


async def verify_token(token: str) -> Optional[TokenUserInfo]:
    """验证Token并返回用户信息（支持本地JWT和外部认证）"""
    if not token:
        return None
    
    # 优先尝试本地JWT验证
    local_user = verify_local_token(token)
    if local_user:
        return local_user
    
    # 尝试外部认证服务器验证
    try:
        async with httpx.AsyncClient() as client:
            # 调用 shudao-4Aserver 的验证接口
            response = await client.post(
                settings.auth.api_url,
                json={"token": token},
                timeout=10.0
            )
            
            logger.info(f"Token验证请求: {settings.auth.api_url}")
            logger.info(f"Token验证响应状态: {response.status_code}")
            
            if response.status_code == 200:
                data = response.json()
                logger.info(f"Token验证响应数据: {data}")
                
                # 检查是否有效
                if not data.get("valid", False):
                    logger.warning("Token无效")
                    return None
                
                # 适配 shudao-4Aserver 的字段名
                return TokenUserInfo(
                    user_id=hash(data.get("accountID", "")) % 1000000,  # 临时生成数字ID
                    username=data.get("name", ""),
                    account=data.get("accountID", ""),
                    role=data.get("role", "user")  # 外部认证的角色
                )
    except Exception as e:
        logger.error(f"外部Token验证失败: {e}")
    
    return None


async def get_user_info_from_token(token: str) -> Optional[TokenUserInfo]:
    """从Token获取用户信息"""
    return await verify_token(token)