class ManageContext

abstract class ManageContext extends FormBase {
    
    /**
     * The machine name of the wizard we're working with.
     *
     * @var string
     */
    protected $machine_name;
    
    /**
     * The typed data manager.
     *
     * @var \Drupal\Core\TypedData\TypedDataManagerInterface
     */
    protected $typedDataManager;
    
    /**
     * The form builder.
     *
     * @var \Drupal\Core\Form\FormBuilderInterface
     */
    protected $formBuilder;
    
    /**
     * The typed data resolver.
     *
     * @var \Drupal\ctools\TypedDataResolver
     */
    protected $typedDataResolver;
    
    /**
     * An array of property types that are eligible as relationships.
     *
     * @var array
     */
    protected $property_types = [];
    
    /**
     * A property for controlling usage of relationships in an implementation.
     *
     * @var bool
     */
    protected $relationships = TRUE;
    
    /**
     * ManageContext constructor.
     *
     * @param \Drupal\Core\TypedData\TypedDataManagerInterface $typed_data_manager
     *   The typed data manager.
     * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
     *   The form builder.
     * @param \Drupal\ctools\TypedDataResolver $ctools_typed_data_resolver
     *   The typed data resolver.
     */
    public function __construct(TypedDataManagerInterface $typed_data_manager, FormBuilderInterface $form_builder, TypedDataResolver $ctools_typed_data_resolver) {
        $this->typedDataManager = $typed_data_manager;
        $this->formBuilder = $form_builder;
        $this->typedDataResolver = $ctools_typed_data_resolver;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('typed_data_manager'), $container->get('form_builder'), $container->get('ctools.typed_data.resolver'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'ctools_manage_context_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $cached_values = $form_state->getTemporaryValue('wizard');
        $this->machine_name = $cached_values['id'];
        $form['items'] = [
            '#type' => 'markup',
            '#prefix' => '<div id="configured-contexts">',
            '#suffix' => '</div>',
            '#theme' => 'table',
            '#header' => [
                $this->t('Context ID'),
                $this->t('Label'),
                $this->t('Data Type'),
                $this->t('Options'),
            ],
            '#rows' => $this->renderRows($cached_values),
            '#empty' => $this->t('No contexts or relationships have been added.'),
        ];
        foreach ($this->typedDataManager
            ->getDefinitions() as $type => $definition) {
            $types[$type] = $definition['label'] . " ({$type})";
            if ($definition['id'] === 'entity_revision') {
                $types[$type] .= ' (' . $this->t('Revision') . ')';
            }
        }
        if (isset($types['entity'])) {
            unset($types['entity']);
        }
        asort($types);
        $form['context'] = [
            '#type' => 'select',
            '#options' => $types,
        ];
        $form['add'] = [
            '#type' => 'submit',
            '#name' => 'add',
            '#value' => $this->t('Add new context'),
            '#ajax' => [
                'callback' => [
                    $this,
                    'addContext',
                ],
                'event' => 'click',
            ],
            '#submit' => [
                'callback' => [
                    $this,
                    'submitForm',
                ],
            ],
        ];
        $form['relationships'] = [
            '#type' => 'select',
            '#title' => $this->t('Add a relationship'),
            '#options' => $this->getAvailableRelationships($cached_values),
            '#access' => $this->relationships,
        ];
        $form['add_relationship'] = [
            '#type' => 'submit',
            '#name' => 'add_relationship',
            '#value' => $this->t('Add Relationship'),
            '#ajax' => [
                'callback' => [
                    $this,
                    'addRelationship',
                ],
                'event' => 'click',
            ],
            '#submit' => [
                'callback' => [
                    $this,
                    'submitForm',
                ],
            ],
            '#access' => $this->relationships,
        ];
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        if ($form_state->getTriggeringElement()['#name'] == 'add') {
            $cached_values = $form_state->getTemporaryValue('wizard');
            [
                ,
                $route_parameters,
            ] = $this->getContextOperationsRouteInfo($cached_values, $this->machine_name, $form_state->getValue('context'));
            $form_state->setRedirect($this->getContextAddRoute($cached_values), $route_parameters);
        }
        if ($form_state->getTriggeringElement()['#name'] == 'add_relationship') {
            $cached_values = $form_state->getTemporaryValue('wizard');
            [
                ,
                $route_parameters,
            ] = $this->getRelationshipOperationsRouteInfo($cached_values, $this->machine_name, $form_state->getValue('relationships'));
            $form_state->setRedirect($this->getRelationshipAddRoute($cached_values), $route_parameters);
        }
    }
    
    /**
     * Add a context.
     *
     * @param array $form
     *   The Drupal Form.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The form state.
     *
     * @return \Drupal\Core\Ajax\AjaxResponse
     *   Form ajax repsonse.
     */
    public function addContext(array &$form, FormStateInterface $form_state) {
        $context = $form_state->getValue('context');
        $cached_values = $form_state->getTemporaryValue('wizard');
        $content = $this->formBuilder
            ->getForm($this->getContextClass($cached_values), $context, $this->getTempstoreId(), $this->machine_name);
        $content['#attached']['library'][] = 'core/drupal.dialog.ajax';
        [
            ,
            $route_parameters,
        ] = $this->getContextOperationsRouteInfo($cached_values, $this->machine_name, $context);
        $route_name = $this->getContextAddRoute($cached_values);
        $route_options = [
            'query' => [
                FormBuilderInterface::AJAX_FORM_REQUEST => TRUE,
            ],
        ];
        $url = Url::fromRoute($route_name, $route_parameters, $route_options);
        $content['submit']['#attached']['drupalSettings']['ajax'][$content['submit']['#id']]['url'] = $url->toString();
        $response = new AjaxResponse();
        $response->addCommand(new OpenModalDialogCommand($this->t('Add new context'), $content, [
            'width' => '700',
        ]));
        return $response;
    }
    
    /**
     * Add relationship form.
     *
     * @param array $form
     *   The Drupal Form.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The form state.
     *
     * @return \Drupal\Core\Ajax\AjaxResponse
     *   Form ajax repsonse.
     */
    public function addRelationship(array &$form, FormStateInterface $form_state) {
        $relationship = $form_state->getValue('relationships');
        $cached_values = $form_state->getTemporaryValue('wizard');
        $content = $this->formBuilder
            ->getForm($this->getRelationshipClass($cached_values), $relationship, $this->getTempstoreId(), $this->machine_name);
        $content['#attached']['library'][] = 'core/drupal.dialog.ajax';
        [
            ,
            $route_parameters,
        ] = $this->getRelationshipOperationsRouteInfo($cached_values, $this->machine_name, $relationship);
        $route_name = $this->getRelationshipAddRoute($cached_values);
        $route_options = [
            'query' => [
                FormBuilderInterface::AJAX_FORM_REQUEST => TRUE,
            ],
        ];
        $url = Url::fromRoute($route_name, $route_parameters, $route_options);
        $content['submit']['#attached']['drupalSettings']['ajax'][$content['submit']['#id']]['url'] = $url->toString();
        $response = new AjaxResponse();
        $response->addCommand(new OpenModalDialogCommand($this->t('Configure Relationship'), $content, [
            'width' => '700',
        ]));
        return $response;
    }
    
    /**
     * Retrieve the available relationships.
     *
     * @param array $cached_values
     *   The cached context values.
     *
     * @return mixed
     *   The available relationships.
     */
    protected function getAvailableRelationships(array $cached_values) {
        
        /** @var \Drupal\ctools\TypedDataResolver $resolver */
        $resolver = $this->typedDataResolver;
        return $resolver->getTokensForContexts($this->getContexts($cached_values));
    }
    
    /**
     * Render the Rows.
     *
     * @param array $cached_values
     *   The cached context values.
     *
     * @return array
     *   The rendered rows.
     */
    protected function renderRows(array $cached_values) {
        $contexts = [];
        foreach ($this->getContexts($cached_values) as $row => $context) {
            [
                $route_name,
                $route_parameters,
            ] = $this->getContextOperationsRouteInfo($cached_values, $this->machine_name, $row);
            $build = [
                '#type' => 'operations',
                '#links' => $this->getOperations($cached_values, $row, $route_name, $route_parameters),
            ];
            $contexts[$row] = [
                $row,
                $context->getContextDefinition()
                    ->getLabel(),
                $context->getContextDefinition()
                    ->getDataType(),
                'operations' => [
                    'data' => $build,
                ],
            ];
        }
        return $contexts;
    }
    
    /**
     * Get available Operations.
     *
     * @param array $cached_values
     *   The cached context values.
     * @param string $row
     *   The row operations are being fetched from.
     * @param string $route_name_base
     *   The route name.
     * @param array $route_parameters
     *   Parameters for the route.
     *
     * @return mixed
     *   The operations.
     */
    protected function getOperations(array $cached_values, string $row, string $route_name_base, array $route_parameters = []) {
        $operations = [];
        if ($this->isEditableContext($cached_values, $row)) {
            $operations['edit'] = [
                'title' => $this->t('Edit'),
                'url' => new Url($route_name_base . '.edit', $route_parameters),
                'weight' => 10,
                'attributes' => [
                    'class' => [
                        'use-ajax',
                    ],
                    'data-dialog-type' => 'modal',
                    'data-dialog-options' => Json::encode([
                        'width' => 700,
                    ]),
                ],
            ];
            $operations['delete'] = [
                'title' => $this->t('Delete'),
                'url' => new Url($route_name_base . '.delete', $route_parameters),
                'weight' => 100,
                'attributes' => [
                    'class' => [
                        'use-ajax',
                    ],
                    'data-dialog-type' => 'modal',
                    'data-dialog-options' => Json::encode([
                        'width' => 700,
                    ]),
                ],
            ];
        }
        return $operations;
    }
    
    /**
     * Return a subclass of '\Drupal\ctools\Form\ContextConfigure'.
     *
     * The ContextConfigure class is designed to be subclassed with custom
     * route information to control the modal/redirect needs of your use case.
     *
     * @param mixed $cached_values
     *   Cached Relationship Class values.
     *
     * @return string
     *   The context class.
     */
    protected abstract function getContextClass(mixed $cached_values);
    
    /**
     * Return a subclass of '\Drupal\ctools\Form\RelationshipConfigure'.
     *
     * The RelationshipConfigure class is designed to be subclassed with custom
     * route information to control the modal/redirect needs of your use case.
     *
     * @param mixed $cached_values
     *   Cached Relationship Class values.
     *
     * @return string
     *   The relationship Class.
     */
    protected abstract function getRelationshipClass(mixed $cached_values);
    
    /**
     * The route to which context 'add' actions should submit.
     *
     * @param mixed $cached_values
     *   Cached Route info values.
     *
     * @return string
     *   The context add route.
     */
    protected abstract function getContextAddRoute(mixed $cached_values);
    
    /**
     * The route to which relationship 'add' actions should submit.
     *
     * @param mixed $cached_values
     *   Cached Route info values.
     *
     * @return string
     *   Relationship Add Route.
     */
    protected abstract function getRelationshipAddRoute(mixed $cached_values);
    
    /**
     * Provide the tempstore id for your specified use case.
     *
     * @return string
     *   The tempstore ID.
     */
    protected abstract function getTempstoreId();
    
    /**
     * Returns the contexts already available in the wizard.
     *
     * @param mixed $cached_values
     *   Cached Contexts.
     *
     * @return \Drupal\Core\Plugin\Context\ContextInterface[]
     *   The contexts.
     */
    protected abstract function getContexts($cached_values);
    
    /**
     * Gets the Context Operations Route info.
     *
     * @param mixed $cached_values
     *   Cached Route info values.
     * @param string $machine_name
     *   Relationship Machine Name.
     * @param string $row
     *   Context Row.
     *
     * @return array
     *   The context operations.
     */
    protected abstract function getContextOperationsRouteInfo($cached_values, $machine_name, $row);
    
    /**
     * Gets the Route info for Relationship Operations.
     *
     * @param mixed $cached_values
     *   Cached Route info values.
     * @param string $machine_name
     *   Relationship Machine Name.
     * @param string $row
     *   Context Row.
     *
     * @return array
     *   The operations allowed.
     */
    protected abstract function getRelationshipOperationsRouteInfo($cached_values, $machine_name, $row);
    
    /**
     * @param mixed $cached_values
     *  Cached context values.
     * @param string $row
     *   Context Row.
     *
     * @return bool
     *   If context is editable.
     */
    protected abstract function isEditableContext($cached_values, $row);

}