MembershipEntityForm.php

<?php

namespace Drupal\paypal_roles\Form;

use Drupal\Core\Ajax\ReplaceCommand;
use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Ajax\AjaxResponse;

/**
 * Form controller for Membership edit forms.
 *
 * @ingroup paypal_roles
 */
class MembershipEntityForm extends ContentEntityForm {

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    /* @var $entity \Drupal\paypal_roles\Entity\MembershipEntity */
    $form = parent::buildForm($form, $form_state);

    $values = $form_state->getValues();
    $entity = $this->entity;

    if (isset($form['role']['widget']['#options']['anonymous'])) {
      unset($form['role']['widget']['#options']['anonymous']);
    }

    if (isset($form['role']['widget']['#options']['authenticated'])) {
      unset($form['role']['widget']['#options']['authenticated']);
    }

    $form['cancellation']['#states'] = array(
      'visible' => array(
        ':input[name="type"]' => array('value' => '1'),
      ),
    );

    $form['cycles']['#states'] = array(
      'invisible' => array(
        ':input[name="type"]' => array('value' => '0'),
      ),
    );

    // Container for inline display.
    $form['length_container'] = array(
      '#type' => 'container',
      '#attributes' => array(
        'class' => array('container-inline', 'length-container'),
      ),
      '#weight' => $form['length']['#weight'],
    );
    // Hide title by 'length_type' element.
    $form['length_type']['widget']['#title_display'] = 'invisible';
    // Copy 'length' element into container.
    $form['length_container']['length'] = $form['length'];
    // Copy 'length_type' element into container.
    $form['length_container']['length_type'] = $form['length_type'];
    // Set weight for 'length_type' element for displaying it after 'length'.
    $form['length_container']['length_type']['#weight'] = $form['length']['#weight'] + 1;
    // Append a small description.
    $form['length_container']['length_desc'] = array(
      '#type' => 'item',
      '#description' => t('The length a Member has access to the Membership can be set to a specified number of Days, Weeks, Months or Years.') . '<br>' . t('If you want to create a simple one-time purchase button with no-expiration time, set this value to 0.'),
      '#weight' => $form['length']['#weight'] + 2,
    );

    // Unset copied (moved) form elements.
    unset($form['length']);
    unset($form['length_type']);

    // Set an Ajax callback on currency.
    $form['currency']['widget']['#ajax'] = array(
      // Function to call when event on form element triggered.
      'callback' => array($this, 'currencyChangedAjax'),
      // Effect when replacing content. Options: 'none' (default), 'slide', 'fade'.
      'effect' => 'fade',
      // Javascript event to trigger Ajax. Currently for: 'onchange'.
      'event' => 'change',
      'progress' => array(
        // Graphic shown to indicate ajax. Options: 'throbber' (default), 'bar'.
        'type' => 'throbber',
        // Message to show along progress graphic. Default: 'Please wait...'.
        'message' => NULL,
      ),
    );

    // Container for inline display.
    $form['amount_container'] = array(
      '#type' => 'container',
      '#attributes' => array(
        'class' => array('container-inline', 'amount-container'),
      ),
      '#weight' => $form['amount']['#weight'],
    );
    // Hide title by 'currency' element.
    $form['currency']['widget']['#title_display'] = 'invisible';
    // Copy 'amount' element into container.
    $form['amount_container']['amount'] = $form['amount'];
    // Copy 'currency' element into container.
    $form['amount_container']['currency'] = $form['currency'];
    // Set weight for 'currency' element for displaying it after 'amount'.
    $form['amount_container']['currency']['#weight'] = $form['amount']['#weight'] + 1;
    // Append a small description.
    $form['amount_container']['amount_desc'] = array(
      '#type' => 'item',
      '#description' => t('The amount of subscription / one-time purchase.') . '<br />' . t('HUF, JPY, TWD: These currencies do not support decimals. Passing a decimal amount will throw an error.'),
      '#weight' => $form['amount']['#weight'] + 2,
    );

    // Unset copied (moved) form elements.
    unset($form['amount']);
    unset($form['currency']);

    // Container for inline display.
    $form['discount_container'] = array(
      '#type' => 'container',
      '#attributes' => array(
        'class' => array('container-inline', 'discount-container'),
      ),
      '#weight' => $form['discount_rate']['#weight'],
      '#states' => array(
        'visible' => array(
          ':input[name="type"]' => array('value' => '0'),
        ),
      ),
    );
    // Hide title by 'discount_role' element.
    $form['discount_role']['widget']['#title_display'] = 'invisible';
    // Rename 'None' option.
    // $form['discount_role']['widget']['#options']['_none'] = t('- everyone -');
    // Prepend helper text.
    $form['discount_role']['widget']['#prefix'] = '% ' . t('only for this role:');
    // Copy 'discount_rate' element into container.
    $form['discount_container']['discount_rate'] = $form['discount_rate'];
    // Copy 'discount_role' element into container.
    $form['discount_container']['discount_role'] = $form['discount_role'];
    // Set weight for 'discount_role' element for displaying it after 'discount_rate'.
    $form['discount_container']['discount_role']['#weight'] = $form['discount_rate']['#weight'] + 1;
    // Append a small description.
    $form['discount_container']['discount_desc'] = array(
      '#type' => 'item',
      '#description' => t('PayPal allows discount rate only for one-time purchase.'),
      '#weight' => $form['discount_rate']['#weight'] + 2,
    );

    // Unset copied (moved) form elements.
    unset($form['discount_rate']);
    unset($form['discount_role']);

    $curr = isset($values['currency'][0]['value']) ? $values['currency'][0]['value'] : FALSE;
    $currency = $curr ? $curr : 'EUR';

    // Container for inline display.
    $form['trial_length_container'] = array(
      '#type' => 'container',
      '#attributes' => array(
        'class' => array('container-inline', 'trial-length-container'),
      ),
      '#weight' => $form['trial_amount']['#weight'],
      '#states' => array(
        'invisible' => array(
          ':input[name="type"]' => array('value' => '0'),
        ),
      ),
    );
    // Hide title by 'trial_length' element.
    $form['trial_length']['widget'][0]['value']['#title_display'] = 'invisible';
    // Prepend helper text.
    $form['trial_length']['widget']['#prefix'] = ' ' . $currency . ' ' . t('for');
    // Hide title by 'trial_length_type' element.
    $form['trial_length_type']['widget']['#title_display'] = 'invisible';
    // Copy 'trial_amount' element into container.
    $form['trial_length_container']['trial_amount'] = $form['trial_amount'];
    // Copy 'trial_length' element into container.
    $form['trial_length_container']['trial_length'] = $form['trial_length'];
    // Set weight for 'trial_length' element for displaying it after 'trial_amount'.
    $form['trial_length_container']['trial_length']['#weight'] = $form['trial_amount']['#weight'] + 1;
    // Copy 'trial_length_type' element into container.
    $form['trial_length_container']['trial_length_type'] = $form['trial_length_type'];
    // Set weight for 'trial_length_type' element for displaying it after 'trial_length'.
    $form['trial_length_container']['trial_length_type']['#weight'] = $form['trial_length']['#weight'] + 1;

    // Unset copied (moved) form elements.
    unset($form['trial_amount']);
    unset($form['trial_length']);
    unset($form['trial_length_type']);

    // Attach custom CSS to fix inline layout.
    $form['#attached'] = array(
      'library' => array(
        'paypal_roles/paypal_roles.forms',
      ),
    );

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state) {
    $values = $form_state->getValues();

    // If Recurring payment.
    if (!empty($values['type'][0]['value']) && (int) $values['type'][0]['value'] === 1) {
      if (!empty($values['length'][0]['value']) && (int) $values['length'][0]['value'] === 0) {
        $form_state->setErrorByName('length', t('Length of subscription cannot be 0. Value 0 is allowed only for one-time purchase.'));
      }

      if (!empty($values['cycles'][0]['value']) && (int) $values['cycles'][0]['value'] === 1) {
        $form_state->setErrorByName('cycles', t('Billing cycles cannot be 1. Set billing cycles to 0, or set a value, which is higher than 1.'));
      }

      if (!empty($values['trial_amount'][0]['value'])) {
        if ((strlen(strrchr($values['trial_amount'][0]['value'], '.')) - 1) > 2) {
          $form_state->setErrorByName('trial_amount', t('Please set the Amount of Trial Period value as a number rounded to 2 decimal places.'));
        }

        if ((float) $values['trial_amount'][0]['value'] > 0) {
          if ((int) $values['trial_length'][0]['value'] <= 0) {
            $form_state->setErrorByName('trial_length', t('Trial Period length cannot be 0.'));
          }
        }
      }
    }

    if (!empty($values['amount'][0]['value'])) {
      if ((strlen(strrchr($values['amount'][0]['value'], '.')) - 1) > 2) {
        $form_state->setErrorByName('amount', t('Please set the Amount value as a number rounded to 2 decimal places.'));
      }
    }

    parent::validateForm($form, $form_state);
  }

  /**
   * Ajax callback to change currencies on form.
   */
  public function currencyChangedAjax(array &$form, FormStateInterface $form_state) {
    $values = $form_state->getValues();

    $curr = isset($values['currency'][0]['value']) ? $values['currency'][0]['value'] : FALSE;
    $currency = $curr ? $curr : 'EUR';

    $form['trial_length_container']['trial_length']['widget']['#prefix'] = ' ' . $currency . ' ' . t('for');
    
    // Instantiate an AjaxResponse Object to return.
    $ajax_response = new AjaxResponse();
    $ajax_response->addCommand(new ReplaceCommand('.field--name-trial-length', $form['trial_length_container']['trial_length']));

    return $ajax_response;
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $entity = $this->entity;
    $status = parent::save($form, $form_state);

    switch ($status) {
      case SAVED_NEW:
        drupal_set_message($this->t('Created the %label Membership.', [
          '%label' => $entity->label(),
        ]));
        break;

      default:
        drupal_set_message($this->t('Saved the %label Membership.', [
          '%label' => $entity->label(),
        ]));
    }
    $form_state->setRedirect('entity.membership.collection');
  }

}