package com.base.config;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.ReflectUtil;
import com.base.framework.utils.assertions.Asserts;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.HandlerMapping;
import javax.servlet.http.HttpServletRequest;
import java.util.*;

/**
 * @Author : LukeRen
 * @DateTime: 2021/12/16 17:49
 * @Description :
 * @Version : 1.0
 */
@Aspect
@Component
@Slf4j
@AllArgsConstructor
public class SysNoticeAop {
    /**
     * 切入点
     * 通过注解实现切面
     * @annotation SysNotice 注解就是一个空注解, 里面什么定义都没有
     */
    @Pointcut("@annotation(com.base.config.SysNotice)")
    public void sysNoticePointcut() {

    }


    /**
     * 配置环绕通知,使用在方法logPointcut()上注册的切入点
     *
     * @param joinPoint join point for advice
     */
    @Around("sysNoticePointcut()") // 里面的参数是 切入点的方法名
    public Object  logAround(ProceedingJoinPoint joinPoint) throws Throwable {
        //系统通知
        Object[] args = joinPoint.getArgs();
        String versionIdStr = null;
        for (Object arg : args) {
            Class<?> aClass = arg.getClass();
            String simpleName = aClass.getSimpleName();
            //获取请求信息使用RequestFacade, 获取响应信息使用 ResponseFacade
            if (!"RequestFacade".equals(simpleName)) {
                // 从@RequestBody参数中获取版本id // ReflectUtil.getField 是Hutools的工具类
                versionIdStr = Optional.ofNullable(ReflectUtil.getField(aClass, "versionId"))
                        .map(field -> Convert.toStr(ReflectUtil.getFieldValue(arg, field)))
                        .orElse(null);
                //没有获取到, 从@PathVariable注解中获取
                if (null == versionIdStr){
                    ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
                    HttpServletRequest request = attributes.getRequest();
                    Map<String, Object> attribute = (Map)request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);
                    versionIdStr = (String)attribute.get("versionId");
                    System.out.println(attribute);
                }
                Asserts.isTrue(!StringUtils.isEmpty(versionIdStr), "500", "系统通知内部错误, 参数不存在");
            }
        }
        // 必须有返回对象, 不然controller得响应信息不得返回前端
        Object obj = joinPoint.proceed();
        return  obj;
    }

}