//go:build linux
// +build linux

package staros

import (
	"testing"
	"time"
)

func Test_TrimSpace(t *testing.T) {

}

func TestAnalyseNetFilesSkipsShortLines(t *testing.T) {
	data := []byte("sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode\nshort\n")
	res, err := analyseNetFiles(data, nil, "tcp")
	if err != nil {
		t.Fatal(err)
	}
	if len(res) != 0 {
		t.Fatalf("expected no parsed connections, got %d", len(res))
	}
}

func TestNetSpeedsRejectsInvalidDuration(t *testing.T) {
	_, err := NetSpeeds(0)
	if err == nil {
		t.Fatal("expected invalid duration error")
	}
	_, err = NetSpeeds(-time.Second)
	if err == nil {
		t.Fatal("expected invalid duration error")
	}
}

func TestUniqueStrings(t *testing.T) {
	got := uniqueStrings([]string{"tcp", "udp", "tcp"})
	if len(got) != 2 {
		t.Fatalf("expected 2 unique values, got %d", len(got))
	}
	if got[0] != "tcp" || got[1] != "udp" {
		t.Fatalf("unexpected order: %#v", got)
	}
}

func TestParseProcStatusKB(t *testing.T) {
	if got := parseProcStatusKB("12 kB"); got != 12*1024 {
		t.Fatalf("expected 12288, got %d", got)
	}
	if got := parseProcStatusKB(""); got != 0 {
		t.Fatalf("expected 0, got %d", got)
	}
}

func TestProcStartTimeFromStatHandlesProcessNameWithSpacesAndParens(t *testing.T) {
	stat := []byte("42 (name with ) parens) S 1 1 1 0 -1 4194560 0 0 0 0 0 0 0 0 20 0 1 0 12345")
	got, ok := procStartTimeFromStat(stat)
	if !ok {
		t.Fatal("expected proc stat start time to parse")
	}
	ticks := int64(clockTicks())
	want := time.Unix(StartTime().Unix()+12345/ticks, (12345%ticks)*int64(time.Second)/ticks)
	if !got.Equal(want) {
		t.Fatalf("unexpected start time: got %s want %s", got, want)
	}
}