package executils

import (
	"errors"
	"io"
	"os"
	"os/exec"
	"testing"
	"time"
)

func TestIsBenignPipeReadError(t *testing.T) {
	tests := []struct {
		name string
		err  error
		want bool
	}{
		{name: "nil", err: nil, want: false},
		{name: "eof", err: io.EOF, want: true},
		{name: "closed", err: os.ErrClosed, want: true},
		{name: "closed pipe", err: io.ErrClosedPipe, want: true},
		{name: "wrapped closed", err: errors.New("read |0: file already closed"), want: true},
		{name: "other", err: errors.New("permission denied"), want: false},
	}

	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			got := isBenignPipeReadError(tc.err)
			if got != tc.want {
				t.Fatalf("got %v, want %v (err=%v)", got, tc.want, tc.err)
			}
		})
	}
}

func TestProcessTracker_TrackUntrack(t *testing.T) {
	pt := NewProcessTracker()
	cmd := exec.Command("sh", "-c", "sleep 1")
	pt.Track(1, cmd)
	if count := pt.Count(); count != 1 {
		t.Fatalf("Count() = %d, want 1", count)
	}
	pt.Untrack(1)
	if count := pt.Count(); count != 0 {
		t.Fatalf("Count() = %d, want 0", count)
	}
}

func TestRunCommandWithTimeout_TimesOut(t *testing.T) {
	pt := NewProcessTracker()
	_, err := RunCommandWithTimeout(200*time.Millisecond, "sh", []string{"-c", "sleep 2"}, "", nil, 99, pt)
	if err == nil {
		t.Fatal("expected timeout error")
	}
}