//go:build windows

package game

import (
	"errors"
	"testing"
	"time"
)

// TestGPUEngineSamplerLive opens the real PDH query and takes two samples;
// the first only primes the rate counters. Skipped (not failed) when the
// machine has no GPU counters.
func TestGPUEngineSamplerLive(t *testing.T) {
	s, err := openGPUEngineSampler()
	if err != nil {
		t.Skipf("no GPU engine counters: %v", err)
	}
	if _, err := s.sample(); !errors.Is(err, errNotPrimed) {
		t.Fatalf("first sample: err = %v, want errNotPrimed", err)
	}
	time.Sleep(200 * time.Millisecond)
	utils, err := s.sample()
	if err != nil {
		t.Fatalf("second sample: %v", err)
	}
	for pid, util := range utils {
		if pid < 0 || util < 0 {
			t.Errorf("pid %d: util %.2f", pid, util)
		}
	}
	t.Logf("%d processes with 3D-engine usage", len(utils))
}