package health

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

func TestHandler(t *testing.T) {
	now := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)
	s := NewState(time.Minute)
	s.now = func() time.Time { return now }
	s.started = now

	get := func() (int, string) {
		rec := httptest.NewRecorder()
		s.Handler().ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/healthz", nil))
		return rec.Code, rec.Body.String()
	}

	if code, _ := get(); code != 200 {
		t.Fatalf("сразу после старта: %d", code)
	}
	now = now.Add(2 * time.Minute)
	if code, body := get(); code != 503 || !strings.Contains(body, "stalled") {
		t.Fatalf("застрял: %d %s", code, body)
	}
	s.Record(errors.New("traefik down"))
	code, body := get()
	if code != 200 || !strings.Contains(body, "traefik down") {
		t.Fatalf("ошибка внешней системы не должна делать unhealthy: %d %s", code, body)
	}
	s.Record(nil)
	if _, body := get(); !strings.Contains(body, "lastSuccess") || strings.Contains(body, "lastError") {
		t.Fatalf("body = %s", body)
	}
}