package net.educoder.service;

import cn.hutool.core.util.RandomUtil;
import com.google.common.cache.Cache;
import lombok.extern.slf4j.Slf4j;
import net.educoder.constant.CommonConstants;
import net.educoder.model.dto.CreateCloudHostDto;
import net.educoder.model.param.ResetCloudHostParam;
import net.educoder.util.JCloudUtil;
import net.educoder.util.ShellUtil;
import net.educoder.util.SleepUtil;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.ThreadUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;


/**
 * @Author: youys
 * @Date: 2022/8/18
 * @Description:
 */
@Slf4j
@Service
public class CloudHostService {

    @Value("${jcloud.username}")
    private String username;

    @Value("${jcloud.password}")
    private String password;

    @Value("${jcloud.imageId}")
    private String imageId;

    @Value("${jcloud.frpc.template}")
    private String frpcTemplate;

    @Value("${jcloud.frpc.host}")
    private String frpcHost;

    @Value("${jcloud.networkIds}")
    private String networkIds;

    @Autowired
    @Qualifier("guavaCache")
    private Cache<String, String> guavaCache;


    private Object lock = new Object();
    private Object networkLock = new Object();

    private int index = 0;

    private List<String> networkIdList;

    /**
     * 创建云主机
     * 1、创建云主机
     * 2、创建浮动ip
     * 3、绑定浮动ip
     *
     * @param port 穿透的端口
     * @return
     */
    public CreateCloudHostDto oneStepCreateCloudHost(int port) {
        String apiToken = guavaCache.getIfPresent(CommonConstants.API_TOKEN);
        if (StringUtils.isBlank(apiToken)) {
            apiToken = refreshApiToken();
        }
        // 创建云主机
        String networkId = nextNetworkId();
        log.info("创建云主机:port:{}, networkId:{}", port, networkId);
        CreateCloudHostDto createCloudHostDto = JCloudUtil.oneStepCreateCloudHost(apiToken, imageId, networkId);
        // 内网穿透
        intranetThrough(port, createCloudHostDto.getUsername(), createCloudHostDto.getPassword(), createCloudHostDto.getFloatingIp());

        createCloudHostDto.setPort(port);
        createCloudHostDto.setIp(frpcHost);

        return createCloudHostDto;
    }


    /**
     * 重置云主机
     *
     * @param resetCloudHostParam
     * @return
     */
    public boolean resetCloudHost(ResetCloudHostParam resetCloudHostParam) {
        String apiToken = guavaCache.getIfPresent(CommonConstants.API_TOKEN);
        if (StringUtils.isBlank(apiToken)) {
            apiToken = refreshApiToken();
        }

        long startTime = System.currentTimeMillis();
        JCloudUtil.oneStepRebuildCloudHost(apiToken, imageId, resetCloudHostParam);
        log.info("重新构建云主机serverId:{},耗时:{}", resetCloudHostParam.getServerId(), (System.currentTimeMillis() - startTime));

        // 重置之后需要重新配置内网穿透
        intranetThrough(resetCloudHostParam.getPort(), resetCloudHostParam.getUsername(), resetCloudHostParam.getPassword(), resetCloudHostParam.getFloatingIp());
        return true;
    }

    /**
     * 重置云主机
     *
     * @param serverId
     * @param floatingIpId
     * @return
     */
    public boolean destroyCloudHost(String serverId, String floatingIpId) {
        String apiToken = guavaCache.getIfPresent(CommonConstants.API_TOKEN);
        if (StringUtils.isBlank(apiToken)) {
            apiToken = refreshApiToken();
        }
        JCloudUtil.oneStepDestroyCloudHost(apiToken, serverId, floatingIpId);
        return true;
    }


    /**
     * 刷新token
     */
    private String refreshApiToken() {
        String apiToken = JCloudUtil.getApiToken(username, password);
        log.info("token refresh--------{}", apiToken);
        guavaCache.put(CommonConstants.API_TOKEN, apiToken);

        return apiToken;
    }

    /**
     * 内网穿透
     *
     * @param port
     * @param username
     * @param password
     * @param floatingIp
     */
    private void intranetThrough(int port, String username, String password, String floatingIp) {
        // 休眠一下是有时候出现这个问题 connect to host 10.119.5.5 port 22: No route to host
        SleepUtil.sleep(3 * 1000);
        String template = frpcTemplate.replaceAll("\\{param1}", frpcHost).replaceAll("\\{param2}", String.valueOf(port));

        // 通过浮动ip+port 连接ssh执行脚本
        String command = StringUtils.join("sshpass -p ", password, " ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null ",
                username, "@", floatingIp, " \'",
                "cd /root/frp_0.44.0_linux_amd64; sudo echo -e \"", template, "\" > frpc.ini ; cat frpc.ini; nohup ./frpc >& cataline.log 2>&1 &", "\'");
        String uuid = RandomUtil.randomString(16);
        log.info("id{},配置内网穿透命令:{}", uuid, command);
        String execResult = ShellUtil.execute(command);
        log.info("id{},执行结果:{}", uuid, execResult);
    }

    /**
     * 获取一个网络id
     *
     * @return
     */
    public String nextNetworkId() {

        if (networkIdList == null) {
            synchronized (networkLock) {
                if (networkIdList == null) {
                    String[] split = networkIds.split(";");
                    networkIdList = new ArrayList(split.length);
                    networkIdList.addAll(Arrays.asList(split));
                }
            }
        }
        synchronized (lock) {
            if (index + 1 > networkIdList.size()) {
                index = 0;
            }
            return networkIdList.get(index++);
        }
    }

}