//go:build windows

package stats

import "testing"

func TestFiletimeToUint64(t *testing.T) {
	ft := filetime{LowDateTime: 0xDEADBEEF, HighDateTime: 0x00001234}
	want := (uint64(0x1234) << 32) | 0xDEADBEEF
	if got := filetimeToUint64(ft); got != want {
		t.Fatalf("got %x want %x", got, want)
	}
	if filetimeToUint64(filetime{}) != 0 {
		t.Fatal("zero filetime should be 0")
	}
}

func TestCPUBusyPercentFromDeltas(t *testing.T) {
	tests := []struct {
		idle, total float64
		want        float64
	}{
		{idle: 25, total: 100, want: 75},
		{idle: 0, total: 100, want: 100},
		{idle: 100, total: 100, want: 0},
		{idle: 0, total: 0, want: 0},
		{idle: -10, total: 50, want: 100}, // over 100% busy clamped
		{idle: 200, total: 100, want: 0}, // negative busy clamped to 0
	}
	for _, tc := range tests {
		if got := cpuBusyPercentFromDeltas(tc.idle, tc.total); got != tc.want {
			t.Fatalf("idle=%v total=%v: got %v want %v", tc.idle, tc.total, got, tc.want)
		}
	}
}