package proxy

import (
	"net/http"
	"net/url"
	"strings"
	"testing"
)

func TestPrometheusFormPOSTToGET(t *testing.T) {
	t.Parallel()
	form := "query=" + url.QueryEscape(`irate(process_cpu_seconds_total{cluster_id=~".*1"}[2m])`) +
		"&start=1&end=2&step=30"
	req, err := http.NewRequest(http.MethodPost, "http://example.com/prefix/api/v1/query_range", strings.NewReader(form))
	if err != nil {
		t.Fatal(err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	out := prometheusFormPOSTToGET(req)
	if out.Method != http.MethodGet {
		t.Fatalf("method = %q, want GET", out.Method)
	}
	q := out.URL.Query()
	if q.Get("query") == "" {
		t.Fatalf("missing query param: %q", out.URL.RawQuery)
	}
	if q.Get("start") != "1" || q.Get("end") != "2" || q.Get("step") != "30" {
		t.Fatalf("params: %v", q)
	}
}

func TestPrometheusFormPOSTToGET_skipsNonPrometheus(t *testing.T) {
	t.Parallel()
	req, _ := http.NewRequest(http.MethodPost, "http://example.com/other", strings.NewReader("a=b"))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	out := prometheusFormPOSTToGET(req)
	if out != req {
		t.Fatal("expected same request pointer for non-query path")
	}
}