package cn.nosum.framework.aop.proxy;


import cn.nosum.framework.aop.aspect.Advice;
import cn.nosum.framework.aop.support.AdvisedSupport;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class JdkDynamicAopProxy implements AopProxy,InvocationHandler {

    private AdvisedSupport config;

    public JdkDynamicAopProxy(AdvisedSupport config) {
        this.config = config;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object returnValue;
        try {
            invokeAdvice(config.getAdvices(method).get("before"));
            returnValue = method.invoke(this.config.getTarget(),args);
            invokeAdvice(config.getAdvices(method).get("after"));
        }catch (Exception e){
            invokeAdvice(config.getAdvices(method).get("afterThrow"));
            throw e;
        }
        return returnValue;
    }

    private void invokeAdvice(Advice advice) {
        try {
            advice.getAdviceMethod().invoke(advice.getAspect());
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }

    public Object getProxy() {
        return getProxy(this.config.getTargetClass().getClassLoader());
    }

    @Override
    public Object getProxy(ClassLoader classLoader) {
        return Proxy.newProxyInstance(classLoader,this.config.getTargetClass().getInterfaces(),this);
    }
}