package com.tanpu.community.config;

import com.ctrip.framework.apollo.model.ConfigChange;
import com.ctrip.framework.apollo.model.ConfigChangeEvent;
import com.ctrip.framework.apollo.spring.annotation.ApolloConfigChangeListener;
import com.ctrip.framework.apollo.spring.boot.ApolloAutoConfiguration;
import com.ctrip.framework.apollo.spring.config.PropertySourcesConstants;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeansException;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.util.LinkedList;
import java.util.List;

/**
 * created by xd on 2021/5/27
 */
@Component
@Slf4j
@ConditionalOnProperty(PropertySourcesConstants.APOLLO_BOOTSTRAP_ENABLED)
@AutoConfigureAfter(ApolloAutoConfiguration.class)
public class ApolloRefresherConfig implements ApplicationContextAware {
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @ApolloConfigChangeListener(value = {"application.yml"})
    public void onChange(ConfigChangeEvent changeEvent) {
        refreshProperties(changeEvent);
    }

    private void refreshProperties(ConfigChangeEvent changeEvent) {
        log.info("Refreshing properties! changedKeys:" + changeEvent.changedKeys());

        List<ConfigChange> changes = new LinkedList<>();
        for (String changedKey : changeEvent.changedKeys()) {
            changes.add(changeEvent.getChange(changedKey));
        }

        log.info("Refreshing properties! changes:" + StringUtils.join(changes, "\n"));

        this.applicationContext.publishEvent(new EnvironmentChangeEvent(changeEvent.changedKeys()));
    }
}