/*
 * Copyright © 2026 Qiantong Technology Co., Ltd.
 * qModel Model Platform(Open Source Edition)
 *  *
 * License:
 * Released under the Apache License, Version 2.0.
 * You may use, modify, and distribute this software for commercial purposes
 * under the terms of the License.
 *  *
 * Special Notice:
 * All derivative versions are strictly prohibited from modifying or removing
 * the default system logo and copyright information.
 * For brand customization, please apply for brand customization authorization via official channels.
 *  *
 * More information: https://qmodel.qiantong.tech/business.html
 *  *
 * ============================================================================
 *  *
 * 版权所有 © 2026 江苏千桐科技有限公司
 * qModel 模型平台（开源版）
 *  *
 * 许可协议：
 * 本项目基于 Apache License 2.0 开源协议发布，
 * 允许在遵守协议的前提下进行商用、修改和分发。
 *  *
 * 特别说明：
 * 所有衍生版本不得修改或移除系统默认的 LOGO 和版权信息；
 * 如需定制品牌，请通过官方渠道申请品牌定制授权。
 *  *
 * 更多信息请访问：https://qmodel.qiantong.tech/business.html
 */

package tech.qiantong.qmodel.security.aspectj;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Component;
import tech.qiantong.qmodel.common.annotation.RateLimiter;
import tech.qiantong.qmodel.common.enums.LimitType;
import tech.qiantong.qmodel.common.exception.ServiceException;
import tech.qiantong.qmodel.common.utils.StringUtils;
import tech.qiantong.qmodel.common.utils.ip.IpUtils;

import javax.annotation.Resource;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.List;

/**
 * 限流处理
 *
 * @author anivia
 */
@Aspect
@Component
public class RateLimiterAspect
{
    private static final Logger log = LoggerFactory.getLogger(RateLimiterAspect.class);

    private RedisTemplate<Object, Object> redisTemplate;

    private RedisScript<Long> limitScript;

    @Resource
    public void setRedisTemplate1(RedisTemplate<Object, Object> redisTemplate)
    {
        this.redisTemplate = redisTemplate;
    }

    @Resource
    public void setLimitScript(RedisScript<Long> limitScript)
    {
        this.limitScript = limitScript;
    }

    @Before("@annotation(rateLimiter)")
    public void doBefore(JoinPoint point, RateLimiter rateLimiter) throws Throwable
    {
        int time = rateLimiter.time();
        int count = rateLimiter.count();

        String combineKey = getCombineKey(rateLimiter, point);
        List<Object> keys = Collections.singletonList(combineKey);
        try
        {
            Long number = redisTemplate.execute(limitScript, keys, count, time);
            if (StringUtils.isNull(number) || number.intValue() > count)
            {
                throw new ServiceException("访问过于频繁，请稍候再试");
            }
            log.info("限制请求'{}',当前请求'{}',缓存key'{}'", count, number.intValue(), combineKey);
        }
        catch (ServiceException e)
        {
            throw e;
        }
        catch (Exception e)
        {
            throw new RuntimeException("服务器限流异常，请稍候再试");
        }
    }

    public String getCombineKey(RateLimiter rateLimiter, JoinPoint point)
    {
        StringBuffer stringBuffer = new StringBuffer(rateLimiter.key());
        if (rateLimiter.limitType() == LimitType.IP)
        {
            stringBuffer.append(IpUtils.getIpAddr()).append("-");
        }
        MethodSignature signature = (MethodSignature) point.getSignature();
        Method method = signature.getMethod();
        Class<?> targetClass = method.getDeclaringClass();
        stringBuffer.append(targetClass.getName()).append("-").append(method.getName());
        return stringBuffer.toString();
    }
}
