package com.zy.bms.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpHeaders;

import java.util.*;

/**
 * RabbitMQ HTTP API接口请求
 *
 * @author yang xiao kun
 * create on 2021/5/14
 */
@Slf4j
public class RabbitMQApi {
    private final static String authorization = "Basic bHEyMDE5OkxpUXVhblJhYmJpdA==";

    /**
     * 向 MQTT 服务器申请用户,供设备进行登录
     * <p>
     * 因为存在先后问题,需要先注册用户,在开通虚拟机权限,
     * 所以逻辑为
     * 发送注册用户请求
     * 尝试申请权限
     * 如果失败,则间隔一秒再次请求
     * 如果申请次数超过3次,则尝试重新注册
     * 重新注册后再次尝试申请
     * 如果申请五次都失败,则结束方法,记录日志
     *
     * @param username 设备登录ID
     * @param password 设备登录密码
     */
    public static void register(String username, String password) {
        addRabbitMqUser(username, password);
        int count = 0;
        while (!setPermission(username)) {
            try {
                Thread.sleep(1000);
                if (count == 2) {
                    addRabbitMqUser(username, password);
                }
                if (count > 4) {
                    break;
                }
                count++;
            } catch (InterruptedException e) {
                log.error("向 MQTT 服务器申请用户失败", e);
                break;
            }
        }
    }

    /**
     * 注册 RabbitMQ 用户
     *
     * @param username 用户名
     * @param password 用户密码
     */
    private static void addRabbitMqUser(String username, String password) {
        String url = "http://view.ailishi.org:15672/api/users/" + username;
        //请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("authorization", authorization);
        //请求参数
        Map<String, String> params = new HashMap<>();
        params.put("username", username);
        params.put("password", password);
        params.put("tags", "");
        HttpUtil.putForJSONEntity(url, headers, JSON.toJSONString(params));
    }

    /**
     * 申请虚拟机权限
     *
     * @param clientId 用户ID
     */
    private static boolean setPermission(String clientId) {
        String url = "http://view.ailishi.org:15672/api/permissions/%2F/" + clientId;
        //请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("authorization", authorization);
        //请求参数
        Map<String, String> params = new HashMap<>();
        params.put("username", clientId);
        params.put("vhost", "/");
        params.put("configure", ".*");
        params.put("write", ".*");
        params.put("read", ".*");
        try {
            HttpUtil.putForJSONEntity(url, headers, JSON.toJSONString(params));
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    /**
     * 查询MQTT服务器链接状态
     */
    public static List<String> connections() {
        String url = "http://view.ailishi.org:15672/api/connections";
        List<String> result = new LinkedList<>();
        HttpHeaders headers = new HttpHeaders();
        headers.add("authorization", authorization);
        try {
            String response = HttpUtil.getForEntity(url, headers);
            //返回结果不为空
            if (!response.equals("")) {
                JSONArray jsonArray = JSON.parseArray(response);
                for (int i = 0; i < jsonArray.size(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    result.add(jsonObject.getString("user"));
                }
            }
        } catch (Exception e) {
            log.error("查询MQTT服务器Connections错误", e);
        }
        return result;
    }

    /**
     * 查询MQTT服务器注册的用户
     */
    public static List<String> users() {
        String url = "http://view.ailishi.org:15672/api/users";
        List<String> result = new LinkedList<>();
        HttpHeaders headers = new HttpHeaders();
        headers.add("authorization", authorization);
        try {
            String response = HttpUtil.getForEntity(url, headers);
            //返回结果不为空
            if (!response.equals("")) {
                JSONArray jsonArray = JSON.parseArray(response);
                for (int i = 0; i < jsonArray.size(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    result.add(jsonObject.getString("name"));
                }
            }
        } catch (Exception e) {
            log.error("查询MQTT服务器users错误", e);
        }
        return result;
    }

}