<?php

namespace Drupal\views_test_data\Plugin\views\field;

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Messenger\MessengerTrait;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\Plugin\views\field\UncacheableFieldHandlerTrait;
use Drupal\views\ResultRow;

/**
 * A handler to provide a field that is completely custom by the administrator.
 *
 * @ingroup views_field_handlers
 *
 * @ViewsField("field_form_button_test")
 */
class FieldFormButtonTest extends FieldPluginBase {

  use MessengerTrait;
  use UncacheableFieldHandlerTrait;

  /**
   * {@inheritdoc}
   */
  public function getValue(ResultRow $row, $field = NULL) {
    return '<!--form-item-' . $this->options['id'] . '--' . $row->index . '-->';
  }

  /**
   * Form constructor for the views form.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   */
  public function viewsForm(&$form, FormStateInterface $form_state) {
    // Make sure we do not accidentally cache this form.
    $form['#cache']['max-age'] = 0;
    // The view is empty, abort.
    if (empty($this->view->result)) {
      unset($form['actions']);
      return;
    }

    $form[$this->options['id']]['#tree'] = TRUE;
    foreach ($this->view->result as $row_index => $row) {
      $form[$this->options['id']][$row_index] = [
        '#type' => 'submit',
        '#value' => t('Test Button'),
        '#name' => 'test-button-' . $row_index,
        '#test_button' => TRUE,
        '#row_index' => $row_index,
        '#attributes' => ['class' => ['test-button']],
      ];
    }
  }

  /**
   * Submit handler for the views form.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   */
  public function viewsFormSubmit(&$form, FormStateInterface $form_state) {
    $triggering_element = $form_state->getTriggeringElement();
    if (!empty($triggering_element['#test_button'])) {
      $row_index = $triggering_element['#row_index'];
      $view_args = !empty($this->view->args) ? implode(', ', $this->view->args) : $this->t('no arguments');
      $this->messenger()->addStatus($this->t('The test button at row @row_index for @view_id (@display) View with args: @args was submitted.', [
        '@display' => $this->view->current_display,
        '@view_id' => $this->view->id(),
        '@args' => $view_args,
        '@row_index' => $row_index,
      ]));
    }
  }

  /**
   * {@inheritdoc}
   */
  public function query() {
    // Do nothing.
  }

}