package com.jjt.biz.service.impl;

import cn.hutool.http.HttpRequest;
import cn.hutool.http.HttpResponse;
import cn.hutool.http.HttpUtil;
import cn.hutool.http.Method;
import cn.hutool.json.JSONArray;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.jjt.biz.service.IPrometheusService;
import com.jjt.common.utils.StringUtils;
import com.jjt.common.utils.sign.Base64;
import com.jjt.system.service.ISysConfigService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.yaml.snakeyaml.util.UriEncoder;

import javax.annotation.Resource;
import java.nio.charset.StandardCharsets;
import java.text.DecimalFormat;
import java.util.HashMap;
import java.util.Map;

/**
 * 告警记录Service业务层处理
 *
 * @author jjt
 * @date 2024-08-08
 */
@Service
@Slf4j
public class PrometheusServiceImpl implements IPrometheusService {
    @Resource
    private ISysConfigService configService;

    /**
     * 获取接口地址
     *
     * @return 接口地址
     */
    private String baseUri() {
        return configService.selectConfigByKey("pm.url");
    }

    /**
     * 即时查询
     *
     * @param param 查询参数
     * @return 结果
     */
    @Override
    public Float query(String param) {
        if (StringUtils.isNotEmpty(param)) {
            if (StringUtils.isNotEmpty(param)) {
                String uri = baseUri() + "/api/v1/query";
                param = UriEncoder.encode(param);

                Map<String, Object> map = new HashMap<>(16);
                map.put("query", param);
                HttpRequest request = HttpUtil.createPost(uri);
                request.setMethod(Method.GET);
                String auth = configService.selectConfigByKey("pm.param");
                if (StringUtils.isNotEmpty(auth)) {
                    String baseAuth = "Basic " + Base64.encode(auth.getBytes());
                    request.header("Authorization", baseAuth);
                }
                request.form(map);
                request.setConnectionTimeout(2000);
                try (HttpResponse execute = request.execute()) {
                    if (!execute.isOk()) {
                        throw new RuntimeException("status:" + execute.getStatus() + "\tres:" + execute.body());
                    }
                    String res = new String(execute.body().getBytes(), StandardCharsets.UTF_8);
                    JSONObject object = JSONUtil.parseObj(res, true);
                    JSONArray array = object.getJSONObject("data").getJSONArray("result");
                    JSONArray value = array.getJSONObject(0).getJSONArray("value");
                    DecimalFormat df = new DecimalFormat("#0.00");
                    return Float.parseFloat(df.format(value.getFloat(1)));
                } catch (Exception e) {
                    log.error("调用prometheus接口失败, url=" + uri + ",param=" + param, e);
                    return null;
                }
            } else {
                return null;
            }
        } else {
            return null;
        }
    }
}