package observability

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"
)

func TestHealthHandlerReadinessAndMetrics_HP_OPS_01(t *testing.T) {
	t.Parallel()
	health := New()
	health.Inc("dispatch_attempt")
	handler := health.Handler(Paths{Liveness: "/live", Readiness: "/ready", Metrics: "/metrics"})
	ready := httptest.NewRecorder()
	handler.ServeHTTP(ready, httptest.NewRequest(http.MethodGet, "/ready", nil))
	if ready.Code != http.StatusServiceUnavailable || !strings.Contains(ready.Body.String(), "ready=false") {
		t.Fatalf("initial readiness = %d %q", ready.Code, ready.Body.String())
	}
	health.SetReady(true)
	health.SetDirty(true)
	ready = httptest.NewRecorder()
	handler.ServeHTTP(ready, httptest.NewRequest(http.MethodGet, "/ready", nil))
	if ready.Code != http.StatusOK || !strings.Contains(ready.Body.String(), "dirty=true") {
		t.Fatalf("ready health = %d %q", ready.Code, ready.Body.String())
	}
	metrics := httptest.NewRecorder()
	handler.ServeHTTP(metrics, httptest.NewRequest(http.MethodGet, "/metrics", nil))
	if metrics.Code != http.StatusOK || !strings.Contains(metrics.Body.String(), "rvbox_dispatch_attempt_total 1") {
		t.Fatalf("metrics = %d %q", metrics.Code, metrics.Body.String())
	}
}

func TestHealthMetricNamesAreBounded_BH_OPS_01(t *testing.T) {
	t.Parallel()
	health := New()
	health.Inc("bad name")
	health.Inc("1bad_name")
	_, _, counters := health.Snapshot()
	if len(counters) != 0 {
		t.Fatalf("invalid metric name recorded: %#v", counters)
	}
}

func TestHealthRendersBoundedGaugesAndDurationHistograms_HP_OPS_02(t *testing.T) {
	t.Parallel()
	health := New()
	health.SetGauge("client_spool_bytes", 4096)
	health.SetGauge("bad gauge", 1)
	health.ObserveDuration("dispatch_latency", 12*time.Millisecond)
	health.ObserveDuration("bad latency", time.Second)

	metrics := httptest.NewRecorder()
	health.Handler(Paths{}).ServeHTTP(metrics, httptest.NewRequest(http.MethodGet, "/metrics", nil))
	body := metrics.Body.String()
	for _, want := range []string{
		"rvbox_client_spool_bytes 4096",
		"rvbox_dispatch_latency_seconds_bucket{le=\"0.05\"} 1",
		"rvbox_dispatch_latency_seconds_bucket{le=\"+Inf\"} 1",
		"rvbox_dispatch_latency_seconds_sum 0.012",
		"rvbox_dispatch_latency_seconds_count 1",
	} {
		if !strings.Contains(body, want) {
			t.Fatalf("metrics missing %q:\n%s", want, body)
		}
	}
	if strings.Contains(body, "bad gauge") || strings.Contains(body, "bad latency") {
		t.Fatalf("unbounded metric name rendered: %s", body)
	}
}