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package cn.home1.cloud.netflix.eureka.server;

import com.netflix.appinfo.InstanceInfo;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.StringUtils;

/**
 * see: https://stackoverflow.com/questions/42296407/spring-cloud-discovery-for-multiple-service-versions
 */
@Configuration
@Aspect
public class EurekaDashboardLabeler {

    private static EurekaDashboardLabeler instance = new EurekaDashboardLabeler();
    @Value("${eureka.instance.metadata.keys.instance-group:instance-group}")
    private String instanceGroupKey;

    /**
     * Singleton pattern used by LTW then Spring
     */
    public static EurekaDashboardLabeler aspectOf() {
        return instance;
    }

    @Around("execution(public * com.netflix.appinfo.InstanceInfo.getId())")
    public String versionLabelAppInstances(final ProceedingJoinPoint jp) throws Throwable {
        final String instanceId = (String) jp.proceed();
        for (final StackTraceElement ste : Thread.currentThread().getStackTrace()) {
            // limit to EurekaController#populateApps in order to avoid side effects
            if (ste.getClassName().contains("EurekaController")) {
                final InstanceInfo info = (InstanceInfo) jp.getThis();
                final String instanceGroup = info.getMetadata().get(this.instanceGroupKey);
                if (StringUtils.hasText(instanceGroup)) {
                    return String.format("%s [%s]", instanceId, instanceGroup);
                }
                break;
            }
        }
        return instanceId;
    }

    @Bean("post-construct-labeler")
    public EurekaDashboardLabeler init() {
        return EurekaDashboardLabeler.aspectOf();
    }
}