package com.fdkankan.modeling.job;

import com.fdkankan.modeling.constants.SysConstants;
import com.fdkankan.rubbersheeting.RubberSheetingUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.ObjectUtils;

import javax.annotation.PostConstruct;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

@Component
public class EcsJob {

    private static final Logger log = LoggerFactory.getLogger(EcsJob.class);

    @Autowired
    private RubberSheetingUtil rubberSheetingUtil;

    @PostConstruct
    public void deleteEcs() {
        if (SysConstants.isResidenceService) {
            log.info("此服务是常驻服务,不启动关闭弹性伸缩定时任务！");
            return;
        }
        log.info("此服务非常驻服务,开始启动关闭弹性伸缩定时任务");
        Executors.newSingleThreadScheduledExecutor().scheduleWithFixedDelay(() -> {
                    // 判断是否有任务执行
                    if (SysConstants.SYSTEM_BUILDING) {
                        log.error("{} 服务构建中，退出停止服务请求！", SysConstants.hostName);
                        return;
                    }
                    log.info("服务未构建，准备停止服务！");
                    if (!SysConstants.executorService.isShutdown()) {
                        SysConstants.SYSTEM_OFFING = true;
                        if (!SysConstants.SYSTEM_BUILDING) {
                            SysConstants.executorService.shutdown();
                            log.error("{} 线程池关闭，不接受新的构建请求！", SysConstants.hostName);
                        }else{
                            SysConstants.SYSTEM_OFFING = false;
                            log.error("{} 服务构建中，退出停止服务请求！", SysConstants.hostName);
                        }
                    }
                    // 因为 阿里云同一时间不能删除多台实例，因此做随机睡眠，错开时间。
                    try {
                        Thread.sleep((new Random().nextInt(30) + 10) * 1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    // 没有任务执行时，则退出
                    if (SysConstants.executorService.isShutdown() && SysConstants.executorService.isTerminated()) {
                        log.error("{} 请求阿里云关闭弹性伸缩", SysConstants.hostName);
                        String result = null;
                        int tryTimes = -1;
                        do {
                            tryTimes++;
                            result = rubberSheetingUtil.deleteEcs(SysConstants.hostName);
                            if (ObjectUtils.isEmpty(result)) {
                                int time = new Random().nextInt(10) + 30;
                                log.error("{} 关闭弹性伸缩失败,{}秒后重试", SysConstants.hostName, time);
                                try {
                                    Thread.sleep(time * 1000);
                                } catch (InterruptedException e) {
                                    e.printStackTrace();
                                }
                            }
                        } while (ObjectUtils.isEmpty(result) && tryTimes < 5);
                        log.error("{} 关闭弹性伸缩成功！", SysConstants.hostName);
                    } else {
                        log.error("{} 服务构建中，退出删除程序失败！", SysConstants.hostName);
                    }
                },
                50, 60, TimeUnit.MINUTES);
    }
}