<?php

namespace Drupal\webform_example_handler\Plugin\WebformHandler;

use Drupal\Component\Utility\Xss;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Markup;
use Drupal\webform\Plugin\WebformHandlerBase;
use Drupal\webform\WebformInterface;
use Drupal\webform\WebformSubmissionInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Webform example handler.
 *
 * @WebformHandler(
 *   id = "example",
 *   label = @Translation("Example"),
 *   category = @Translation("Example"),
 *   description = @Translation("Example of a webform submission handler."),
 *   cardinality = \Drupal\webform\Plugin\WebformHandlerInterface::CARDINALITY_SINGLE,
 *   results = \Drupal\webform\Plugin\WebformHandlerInterface::RESULTS_IGNORED,
 *   submission = \Drupal\webform\Plugin\WebformHandlerInterface::SUBMISSION_REQUIRED,
 * )
 */
class ExampleWebformHandler extends WebformHandlerBase {

  /**
   * The token manager.
   *
   * @var \Drupal\webform\WebformTokenManagerInterface
   */
  protected $tokenManager;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);
    $instance->tokenManager = $container->get('webform.token_manager');
    return $instance;
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'message' => 'This is a custom message.',
      'debug' => FALSE,
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    // Message.
    $form['message'] = [
      '#type' => 'fieldset',
      '#title' => $this->t('Message settings'),
    ];
    $form['message']['message'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Message to be displayed when form is completed'),
      '#default_value' => $this->configuration['message'],
      '#required' => TRUE,
    ];

    // Development.
    $form['development'] = [
      '#type' => 'details',
      '#title' => $this->t('Development settings'),
    ];
    $form['development']['debug'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Enable debugging'),
      '#description' => $this->t('If checked, every handler method invoked will be displayed onscreen to all users.'),
      '#return_value' => TRUE,
      '#default_value' => $this->configuration['debug'],
    ];

    return $this->setSettingsParents($form);
  }

  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    parent::submitConfigurationForm($form, $form_state);
    $this->configuration['message'] = $form_state->getValue('message');
    $this->configuration['debug'] = (bool) $form_state->getValue('debug');
  }

  /**
   * {@inheritdoc}
   */
  public function alterElements(array &$elements, WebformInterface $webform) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function overrideSettings(array &$settings, WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function alterForm(array &$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
    if ($value = $form_state->getValue('element')) {
      $form_state->setErrorByName('element', $this->t('The element must be empty. You entered %value.', ['%value' => $value]));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function confirmForm(array &$form, FormStateInterface $form_state, WebformSubmissionInterface $webform_submission) {
    $message = $this->configuration['message'];
    $message = $this->replaceTokens($message, $this->getWebformSubmission());
    $this->messenger()->addStatus(Markup::create(Xss::filter($message)), FALSE);
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function preCreate(array &$values) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function postCreate(WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function postLoad(WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function preDelete(WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function postDelete(WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function preSave(WebformSubmissionInterface $webform_submission) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function postSave(WebformSubmissionInterface $webform_submission, $update = TRUE) {
    $this->debug(__FUNCTION__, $update ? 'update' : 'insert');
  }

  /**
   * {@inheritdoc}
   */
  public function preprocessConfirmation(array &$variables) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function createHandler() {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function updateHandler() {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function deleteHandler() {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function createElement($key, array $element) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function updateElement($key, array $element, array $original_element) {
    $this->debug(__FUNCTION__);
  }

  /**
   * {@inheritdoc}
   */
  public function deleteElement($key, array $element) {
    $this->debug(__FUNCTION__);
  }

  /**
   * Display the invoked plugin method to end user.
   *
   * @param string $method_name
   *   The invoked method name.
   * @param string $context1
   *   Additional parameter passed to the invoked method name.
   */
  protected function debug($method_name, $context1 = NULL) {
    if (!empty($this->configuration['debug'])) {
      $t_args = [
        '@id' => $this->getHandlerId(),
        '@class_name' => get_class($this),
        '@method_name' => $method_name,
        '@context1' => $context1,
      ];
      $this->messenger()->addWarning($this->t('Invoked @id: @class_name:@method_name @context1', $t_args), TRUE);
    }
  }

}
