{% import 'lib/di.twig' as di %}
<?php

namespace Drupal\{{ machine_name }}\Plugin\Block;

{% sort %}
  {% if access %}
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Session\AccountInterface;
  {% endif %}
use Drupal\Core\Block\BlockBase;
  {% if configurable %}
use Drupal\Core\Form\FormStateInterface;
  {% endif %}
  {% if services %}
{{ di.use(services) }}
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
  {% endif %}
{% endsort %}

/**
 * Provides {{ plugin_label|article|lower }} block.
 *
 * @Block(
 *   id = "{{ plugin_id }}",
 *   admin_label = @Translation("{{ plugin_label }}"),
 *   category = @Translation("{{ category }}")
 * )
 */
class {{ class }} extends BlockBase {% if services %}implements ContainerFactoryPluginInterface {% endif %}{

{% if services %}
{{ di.properties(services) }}

  /**
   * Constructs a new {{ class }} instance.
   *
   * @param array $configuration
   *   The plugin configuration, i.e. an array with configuration values keyed
   *   by configuration option name. The special key 'context' may be used to
   *   initialize the defined contexts by setting it to an array of context
   *   values keyed by context names.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
{{ di.annotation(services) }}
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, {{ di.signature(services) }}) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
{{ di.assignment(services) }}
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
{{ di.container(services) }}
    );
  }

{% endif %}
{% if configurable %}
  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'foo' => $this->t('Hello world!'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    $form['foo'] = [
      '#type' => 'textarea',
      '#title' => $this->t('Foo'),
      '#default_value' => $this->configuration['foo'],
    ];
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) {
    $this->configuration['foo'] = $form_state->getValue('foo');
  }

{% endif %}
{% if access %}
  /**
   * {@inheritdoc}
   */
  protected function blockAccess(AccountInterface $account) {
    // @DCG Evaluate the access condition here.
    $condition = TRUE;
    return AccessResult::allowedIf($condition);
  }

{% endif %}
  /**
   * {@inheritdoc}
   */
  public function build() {
    $build['content'] = [
      '#markup' => $this->t('It works!'),
    ];
    return $build;
  }

}