"""
API日志中间件
"""
import time
from fastapi import Request
from starlette.middleware.base import BaseHTTPMiddleware
from sqlalchemy.orm import Session
from app.database import SessionLocal
from app.models.api_log import APILog
from app.core.logger import logger
from datetime import datetime

class APILoggingMiddleware(BaseHTTPMiddleware):
    """API日志中间件"""
    
    async def dispatch(self, request: Request, call_next):
        start_time = time.time()
        
        # 获取请求信息
        method = request.method
        url = str(request.url)
        client_ip = request.client.host if request.client else None
        user_agent = request.headers.get("user-agent", "")
        
        # 获取请求体（如果是POST/PUT），其它方法不修改url
        request_body = ""
        if method in ["POST", "PUT", "PATCH"]:
            try:
                body = await request.body()
                request_body = body.decode('utf-8')[:1000]  # 限制长度
            except:
                pass
        
        # 执行请求
        response = await call_next(request)
        
        # 计算执行时间
        execution_time = int((time.time() - start_time) * 1000)
        
        # 获取响应状态码
        status_code = response.status_code
        
        # 异步记录日志（避免阻塞）
        try:
            db = SessionLocal()
            try:
                api_log = APILog(
                    endpoint=url,
                    method=method,
                    request_data=request_body,
                    ip_address=client_ip,
                    user_agent=user_agent,
                    response_code=status_code,
                    execution_time=execution_time,
                    created_at=datetime.now()
                )
                db.add(api_log)
                db.commit()
            except Exception as e:
                db.rollback()
                logger.error(f"记录API日志失败: {e}")
            finally:
                db.close()
        except:
            pass
        
        return response