package tracing

import (
	"fmt"
	"github.com/emicklei/go-restful"
	"io/ioutil"
	"log"
	"net/http"
)

var JaegerQueryUrl = "http://jaeger-query.istio-system.svc:16686/jaeger"

func GetServiceTracing(request *restful.Request, response *restful.Response) {
	namespace := request.PathParameter("namespace")
	service := request.PathParameter("service")

	serviceName := fmt.Sprintf("%s.%s", service, namespace)

	url := fmt.Sprintf("%s/api/traces?%s&service=%s", JaegerQueryUrl, request.Request.URL.RawQuery, serviceName)

	resp, err := http.Get(url)

	if err != nil {
		log.Printf("query jaeger faile with err %v", err)
		response.WriteError(http.StatusInternalServerError, err)
		return
	}

	body, err := ioutil.ReadAll(resp.Body)
	defer resp.Body.Close()

	if err != nil {
		log.Printf("read response error : %v", err)
		response.WriteError(http.StatusInternalServerError, err)
		return
	}

	// need to set header for proper response
	response.Header().Set("Content-Type", "application/json")
	_, err = response.Write(body)

	if err != nil {
		log.Printf("write response failed %v", err)
	}
}