package metrics

import (
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/prometheus/client_golang/prometheus/promhttp"
)

func TestMetricsExposeRegistered(t *testing.T) {
	m := New()
	m.CheckRuns.WithLabelValues("c1", "ok").Inc()
	m.SpoolDepth.Set(7)
	m.EventsChannelFull.Inc()
	srv := httptest.NewServer(promhttp.HandlerFor(m.Registry, promhttp.HandlerOpts{}))
	defer srv.Close()
	resp, err := http.Get(srv.URL)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	s := string(body)
	for _, want := range []string{
		`monlet_agent_check_runs_total{check_id="c1",status="ok"} 1`,
		`monlet_agent_spool_events 7`,
		`monlet_agent_events_channel_full_total 1`,
	} {
		if !strings.Contains(s, want) {
			t.Errorf("missing %q in output", want)
		}
	}
}