<?php

class CustomerInformation extends AbstractType
{
    /**
     * @var Translator $translator
     */
    private $translator;

    public function __construct(
        Translator $translator
    ) {
        $this->translator = $translator;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->addEventListener(
            FormEvents::PRE_SUBMIT,
            [$this, 'onPreSubmit']
        );
    }

    public function onPreSubmit(FormEvent $event)
    {
        $data = $event->getData();
        $form = $event->getForm();

        if (!empty($data['customerId'])) {
            // ...
            if (count($customer->customerPriceLists()) === 0) {
                $form->addError(new FormError($this->translator->trans(
                    'No price list linked from QSP to customer.',
                    [],
                    $form->getConfig()->getOption('translation_domain')
                )));
            }
        }
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'translation_domain' => 'order_entry'
        ]);
    }
}