backend: add: DeleteUser, fix: validation

internal/services/user_service.go

@@ -24,6 +24,7 @@ type UserServiceInterface interface {
 	GetUsers(where map[string]interface{}) (*[]models.User, error)
 	VerifyUser(token *string) (*models.User, error)
 	UpdateUser(user *models.User) (*models.User, error)
+	DeleteUser(lastname string, id uint) error
 }
 
 type UserService struct {
@@ -31,6 +32,22 @@ type UserService struct {
 	Licences repositories.LicenceInterface
 }
 
+func (service *UserService) DeleteUser(lastname string, id uint) error {
+	if id == 0 || lastname == "" {
+		return errors.ErrNoData
+	}
+
+	user, err := service.GetUserByID(id)
+	if err != nil {
+		return err
+	}
+	if user == nil {
+		return errors.ErrUserNotFound
+	}
+
+	return service.Repo.DeleteUser(id)
+}
+
 func (service *UserService) UpdateUser(user *models.User) (*models.User, error) {
 
 	if user.ID == 0 {