<?php

namespace Drupal\custom_forms\Form;

use Drupal\Component\Datetime\TimeInterface;
use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Entity\EntityRepositoryInterface;
use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\custom_forms\CustomFormsSubmissionHandlerManager;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Form controller for the custom form handler edit forms.
 *
 * This is the backend add/edit form.
 */
class CustomFormHandlerForm extends ContentEntityForm {

  /**
   * The entity being used by this form.
   *
   * @var \Drupal\custom_forms\Entity\CustomFormSubmissionHandlerInterface
   */
  protected $entity;

  /**
   * @var \Drupal\custom_forms\CustomFormsSubmissionHandlerManager
   *   The plugin manager for submission handler plugins.
   */
  protected $pluginManager;

  /**
   * @inheritDoc
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity.repository'),
      $container->get('plugin.manager.custom_forms_submission_handlers'),
      $container->get('entity_type.manager'),
      $container->get('entity_type.bundle.info'),
      $container->get('datetime.time')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function __construct(
    EntityRepositoryInterface $entity_repository,
    CustomFormsSubmissionHandlerManager $pluginManager,
    EntityTypeManagerInterface $entityTypeManager,
    EntityTypeBundleInfoInterface $entity_type_bundle_info = NULL,
    TimeInterface $time = NULL
  ) {
    parent::__construct($entity_repository, $entity_type_bundle_info, $time);
    $this->pluginManager = $pluginManager;
    $this->entityTypeManager = $entityTypeManager;
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $request      = \Drupal::request();
    $attributes   = $request->attributes;
    /** @var \Drupal\custom_forms\CustomFormInterface $customForm */
    $customForm   = $attributes->get('custom_form');
    $form         = parent::buildForm($form, $form_state);
    $form['#theme'] = 'system_config_form';

    $plugins = [];
    foreach ($this->pluginManager->getDefinitions() as $plugin_id => $plugin_definition) {
      $plugins[$plugin_id] = $plugin_definition['label'];
    }

    $form['form'] = [
      '#type' => 'value',
      '#value' => $customForm
    ];

    $form['plugin'] = [
      '#type' => 'select',
      '#title' => $this->t('Type'),
      '#description' => $this->t('Choose what type of handler it should be.'),
      '#required' => TRUE,
      '#options' => $plugins,
      '#empty_option' => '- ' . $this->t('Select type') . ' -',
    ];

    // If we only have one plugin available, disable the field and add select
    // the only option.
    if (count($plugins) === 1) {
      $form['plugin']['#disabled'] = TRUE;
      $form['plugin']['#value'] = key($plugins);
      $form['plugin']['#default_value'] = key($plugins);
    }

    // If the entity isn't new (not on add-form) and the plugin exists, show
    // the settings.
    if (!$this->entity->isNew() && !$this->entity->get('plugin')->isEmpty()) {
      $plugin_id = $this->entity->get('plugin')->value;
      $definition = $this->pluginManager->getDefinition($plugin_id);
      $settings = $this->entity->getPluginSettings();

      /** @var \Drupal\custom_forms\Plugin\CustomForms\SubmissionHandler\CustomFormsSubmissionHandlerInterface $plugin */
      $plugin = $this->entity->getPlugin();

      $form['plugin_entity'] = [
        '#type' => 'value',
        '#value' => $plugin,
      ];

      if ($definition['has_settings']) {
        $form['settings'] = [
          '#type' => 'fieldset',
          '#title' => $this->t('Settings'),
          '#tree' => TRUE,
        ];

        $form['settings'] += $plugin->buildSettingsForm($customForm, $form, $form_state);
      }

    }

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $values = $form_state->cleanValues()->getValues();
    /** @var \Drupal\custom_forms\Plugin\CustomForms\SubmissionHandler\CustomFormsSubmissionHandlerInterface $plugin */
    $plugin = $form_state->getValue('plugin_entity');
    unset($values['plugin_entity']);
    $form_state->setValues($values);

    if ($plugin !== NULL) {
      $plugin->submitSettingsForm($this->entity->getCustomForm(), $form, $form_state);
    }

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

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    /** @var \Drupal\custom_forms\Entity\CustomFormSubmissionHandler $entity */
    $entity             = $this->getEntity();
    $entity->setOwnerId($this->currentUser()->id());
    $result             = $entity->save();
    $arguments          = ['%label' => $this->entity->label(), '%form' => $entity->getCustomForm()->label()];

    if ($result == SAVED_NEW) {
      $this->messenger()->addMessage($this->t('New handler %label for %form has been created.', $arguments));
      $form_state->setRedirect('entity.custom_form_submission_handler.edit_form', ['custom_form' => $entity->getCustomForm()->id(), 'custom_form_submission_handler' => $entity->id()]);
    }
    else {
      $this->messenger()->addMessage($this->t('The handler %label for %form has been updated.', $arguments));
      $form_state->setRedirect('entity.custom_form_submission_handler.collection', ['custom_form' => $entity->getCustomForm()->id()]);
    }

  }

  /**
   * @inheritDoc
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    $actions['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Save'),
      '#submit' => ['::submitForm', '::save'],
    ];

    if (!$this->entity->isNew() && $this->entity->hasLinkTemplate('delete-form')) {
      $route_info = $this->entity->toUrl('delete-form');
      $route_info->setRouteParameter('custom_form', $this->entity->getCustomForm()->id());
      if ($this->getRequest()->query->has('destination')) {
        $query = $route_info->getOption('query');
        $query['destination'] = $this->getRequest()->query->get('destination');
        $route_info->setOption('query', $query);
      }
      $actions['delete'] = [
        '#type' => 'link',
        '#title' => $this->t('Delete'),
        '#access' => $this->entity->access('delete'),
        '#attributes' => [
          'class' => ['button', 'button--danger'],
        ],
      ];
      $actions['delete']['#url'] = $route_info;
    }

    return $actions;
  }

}