package com.dy.common.multiDataSource;


import com.dy.common.contant.Constant;
import com.dy.common.springUtil.SpringContextUtil;
import com.mysql.cj.util.StringUtils;
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.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.Objects;

@Slf4j
@Aspect
@Order(Constant.AspectOrderDataSource)
@Component
public class DataSourceSingleAspect {

    @Pointcut("@annotation(com.dy.common.multiDataSource.DataSourceSingle)")
    public void dataSourceSinglePointCut() {
    }

    @Around("dataSourceSinglePointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        MethodSignature signature = (MethodSignature) point.getSignature();
        Method method = signature.getMethod();
        DataSourceSingle dataSource = method.getAnnotation(DataSourceSingle.class);

        if (Objects.nonNull(dataSource) && !StringUtils.isNullOrEmpty(dataSource.value())) {
            //log.info("数据源指定为" + dataSource.value());
            //强制转成方法上配置的数据源，替换掉DataSourceContext中保存的数据源
            DataSourceContext.set(dataSource.value());
        }else{
            String datasourceName = SpringContextUtil.getApplicationContext().getEnvironment().getProperty("spring.datasource.names") ;
            if(!StringUtils.isNullOrEmpty(datasourceName)){
                //log.info("根据配置数据源为" + datasourceName);
                DataSourceContext.set(datasourceName);
            }else{
                log.error("数据源未指定");
            }
        }
        try {
            //log.info("数据库操作开始" + dataSource.value());
            return point.proceed();
        } finally {
            // 销毁数据源 在执行方法之后
            //log.info("数据源操作完毕" + dataSource.value());
            DataSourceContext.remove();
        }
    }
}