package com.se.system.service;

import com.alibaba.fastjson.JSONObject;
import com.se.system.domain.vo.NacosConfigVo;
import com.se.system.utils.CaffeineUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.*;
import org.springframework.stereotype.Component;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.Map;

@Component
@SuppressWarnings("ALL")
public class NacosService {
    @Value("${spring.cloud.nacos.config.server-addr}")
    String serverAddr;

    @Value("${spring.cloud.nacos.username}")
    String username;

    @Value("${spring.cloud.nacos.password}")
    String password;

    @Resource
    RestTemplate restTemplate;

    final static String key = "nacos:login:token";

    private String getToken() throws Exception {
        Object obj = CaffeineUtils.get(key);
        if (obj instanceof String) {
            return (String) obj;
        }

        String token = login();
        if (null == token) throw new Exception("Nacos令牌为空");

        CaffeineUtils.put(key, token);

        return token;
    }

    private String login() {
        String url = "http://" + serverAddr + "/nacos/v1/auth/users/login";

        MultiValueMap<String, Object> map = new LinkedMultiValueMap();
        map.add("username", username);
        map.add("password", password);

        JSONObject obj = restTemplate.postForObject(url, map, JSONObject.class);
        if (null == obj || !obj.containsKey("accessToken")) {
            return null;
        }

        return obj.getString("accessToken");
    }

    public void getNacosConfig(String dataId, HttpServletRequest req, HttpServletResponse res) throws Exception {
        String token = getToken();
        // String url = "http://" + serverAddr + "/nacos/v1/cs/configs?dataId=" + dataId + "&group=&appName=&pageNo=1&pageSize=10&search=accurate";
        String url = "http://" + serverAddr + "/nacos/v1/cs/configs?dataId=" + dataId + "&group=DEFAULT_GROUP&namespaceId=&tenant=&show=all&username=";

        HttpHeaders headers = new HttpHeaders();
        headers.set("accessToken", token);

        HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(headers);
        ResponseEntity<String> re = restTemplate.exchange(url, HttpMethod.GET, requestEntity, String.class);

        res.setContentType("application/json;charset=UTF-8");
        PrintWriter out = res.getWriter();
        out.print(re.getBody());
        out.flush();
        out.close();
    }

    public void updateNacosConfig(NacosConfigVo vo, HttpServletRequest req, HttpServletResponse res) throws Exception {
        if (null == vo || null == vo.getId() || null == vo.getDataId() || null == vo.getContent())
            throw new Exception("NacosConfigVo数据不正确");

        String token = getToken();
        vo.setModifyTime(System.currentTimeMillis());
        //vo.setMd5(StringUtils.md5(vo.getContent()));
        String url = "http://" + serverAddr + "/nacos/v1/cs/configs?username=" + username;

        HttpHeaders headers = new HttpHeaders();
        // headers.setContentType(MediaType.APPLICATION_JSON);
        // headers.setContentType(new MediaType("application", "json", StandardCharsets.UTF_8));
        headers.setContentType(MediaType.valueOf("application/x-www-form-urlencoded"));
        headers.set("accessToken", token);
        headers.set("casMd5", vo.getMd5());

        MultiValueMap<String, Object> map = createMap(vo);
        HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(map, headers);
        ResponseEntity<String> re = restTemplate.exchange(url, HttpMethod.POST, entity, String.class);

        res.setContentType("application/json;charset=UTF-8");
        PrintWriter out = res.getWriter();
        out.print(re.getBody());
        out.flush();
        out.close();
    }

    private <T> MultiValueMap<String, Object> createMap(T t) throws Exception {
        MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();

        Field[] fields = t.getClass().getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true);
            map.add(field.getName(), field.get(t));
        }

        return map;
    }
}