package services

import (
	"bytes"
	"fmt"
	"os"
	"path/filepath"
	"testing"
)

func TestFailedHookRestoresStoredService(t *testing.T) {
	path := filepath.Join(t.TempDir(), "services.json")
	m := NewManager(path)
	if err := m.SetService("ssh", 2222, false); err != nil {
		t.Fatal(err)
	}
	before, _ := os.ReadFile(path)
	old, _ := m.GetService("ssh")
	m.RegisterHook("ssh", func(name string, port int, disabled bool) error {
		_, _ = m.GetService(name)
		if port == 3333 {
			return fmt.Errorf("port in use")
		}
		return nil
	})
	if err := m.SetService("ssh", 3333, false); err == nil {
		t.Fatal("listener error lost")
	}
	current, _ := m.GetService("ssh")
	after, _ := os.ReadFile(path)
	if current != old || !bytes.Equal(before, after) {
		t.Fatal("failed change was not rolled back")
	}
}