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package com.nepxion.discovery.plugin.framework.configuration;

/**
 * Title: Nepxion Discovery
 * Description: Nepxion Discovery
 * Copyright: Copyright (c) 2017-2050
 * Company: Nepxion
 * @author Haojun Ren
 * @version 1.0
 */

import javax.inject.Provider;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.cloud.netflix.ribbon.PropertiesFactory;
import org.springframework.cloud.netflix.ribbon.eureka.EurekaRibbonClientConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.ConfigurableEnvironment;

import com.nepxion.discovery.plugin.framework.decorator.EurekaServerListDecorator;
import com.nepxion.discovery.plugin.framework.listener.loadbalance.LoadBalanceListenerExecutor;
import com.netflix.client.config.IClientConfig;
import com.netflix.discovery.EurekaClient;
import com.netflix.loadbalancer.ServerList;
import com.netflix.niws.loadbalancer.DiscoveryEnabledNIWSServerList;

@Configuration
@AutoConfigureAfter(EurekaRibbonClientConfiguration.class)
public class EurekaLoadBalanceConfiguration {
    @Value("${ribbon.eureka.approximateZoneFromHostname:false}")
    private boolean approximateZoneFromHostname = false;

    @Value("${ribbon.client.name}")
    private String serviceId = "client";

    @Autowired
    private PropertiesFactory propertiesFactory;

    @Autowired
    private ConfigurableEnvironment environment;

    @Autowired
    private LoadBalanceListenerExecutor loadBalanceListenerExecutor;

    @Bean
    public ServerList ribbonServerList(IClientConfig config, Provider eurekaClientProvider) {
        if (this.propertiesFactory.isSet(ServerList.class, serviceId)) {
            return this.propertiesFactory.get(ServerList.class, config, serviceId);
        }

        DiscoveryEnabledNIWSServerList discoveryServerList = new DiscoveryEnabledNIWSServerList(config, eurekaClientProvider);

        EurekaServerListDecorator serverList = new EurekaServerListDecorator(discoveryServerList, config, this.approximateZoneFromHostname);
        serverList.setEnvironment(environment);
        serverList.setLoadBalanceListenerExecutor(loadBalanceListenerExecutor);
        serverList.setServiceId(config.getClientName());

        return serverList;
    }
}