class ViewsUiHooks

class ViewsUiHooks {
    
    /**
     * Implements hook_help().
     */
    public function help($route_name, RouteMatchInterface $route_match) {
        switch ($route_name) {
            case 'help.page.views_ui':
                $output = '';
                $output .= '<h2>' . t('About') . '</h2>';
                $output .= '<p>' . t('The Views UI module provides an interface for managing views for the <a href=":views">Views module</a>. For more information, see the <a href=":handbook">online documentation for the Views UI module</a>.', [
                    ':views' => Url::fromRoute('help.page', [
                        'name' => 'views',
                    ])->toString(),
                    ':handbook' => 'https://www.drupal.org/documentation/modules/views_ui',
                ]) . '</p>';
                $output .= '<h2>' . t('Uses') . '</h2>';
                $output .= '<dl>';
                $output .= '<dt>' . t('Creating and managing views') . '</dt>';
                $output .= '<dd>' . t('Views can be created from the <a href=":list">Views list page</a> by using the "Add view" action. Existing views can be managed from the <a href=":list">Views list page</a> by locating the view in the "Enabled" or "Disabled" list and selecting the desired operation action, for example "Edit".', [
                    ':list' => Url::fromRoute('entity.view.collection', [
                        'name' => 'views_ui',
                    ])->toString(),
                ]) . '</dd>';
                $output .= '<dt>' . t('Enabling and disabling views') . '<dt>';
                $output .= '<dd>' . t('Views can be enabled or disabled from the <a href=":list">Views list page</a>. To enable a view, find the view within the "Disabled" list and select the "Enable" operation. To disable a view find the view within the "Enabled" list and select the "Disable" operation.', [
                    ':list' => Url::fromRoute('entity.view.collection', [
                        'name' => 'views_ui',
                    ])->toString(),
                ]) . '</dd>';
                $output .= '<dt>' . t('Exporting and importing views') . '</dt>';
                $output .= '<dd>' . t('Views can be exported and imported as configuration files by using the <a href=":config">Configuration Manager module</a>.', [
                    ':config' => \Drupal::moduleHandler()->moduleExists('config') ? Url::fromRoute('help.page', [
                        'name' => 'config',
                    ])->toString() : '#',
                ]) . '</dd>';
                $output .= '</dl>';
                return $output;
        }
    }
    
    /**
     * Implements hook_entity_type_build().
     */
    public function entityTypeBuild(array &$entity_types) {
        
        /** @var \Drupal\Core\Entity\EntityTypeInterface[] $entity_types */
        $entity_types['view']->setFormClass('edit', 'Drupal\\views_ui\\ViewEditForm')
            ->setFormClass('add', 'Drupal\\views_ui\\ViewAddForm')
            ->setFormClass('preview', 'Drupal\\views_ui\\ViewPreviewForm')
            ->setFormClass('duplicate', 'Drupal\\views_ui\\ViewDuplicateForm')
            ->setFormClass('delete', 'Drupal\\Core\\Entity\\EntityDeleteForm')
            ->setFormClass('break_lock', 'Drupal\\views_ui\\Form\\BreakLockForm')
            ->setListBuilderClass('Drupal\\views_ui\\ViewListBuilder')
            ->setLinkTemplate('edit-form', '/admin/structure/views/view/{view}')
            ->setLinkTemplate('edit-display-form', '/admin/structure/views/view/{view}/edit/{display_id}')
            ->setLinkTemplate('preview-form', '/admin/structure/views/view/{view}/preview/{display_id}')
            ->setLinkTemplate('duplicate-form', '/admin/structure/views/view/{view}/duplicate')
            ->setLinkTemplate('delete-form', '/admin/structure/views/view/{view}/delete')
            ->setLinkTemplate('enable', '/admin/structure/views/view/{view}/enable')
            ->setLinkTemplate('disable', '/admin/structure/views/view/{view}/disable')
            ->setLinkTemplate('break-lock-form', '/admin/structure/views/view/{view}/break-lock')
            ->setLinkTemplate('collection', '/admin/structure/views');
    }
    
    /**
     * Implements hook_theme().
     */
    public function theme() : array {
        return [
            // Edit a view
'views_ui_display_tab_setting' => [
                'variables' => [
                    'description' => '',
                    'link' => '',
                    'settings_links' => [],
                    'overridden' => FALSE,
                    'defaulted' => FALSE,
                    'description_separator' => TRUE,
                    'class' => [],
                ],
                'file' => 'views_ui.theme.inc',
            ],
            'views_ui_display_tab_bucket' => [
                'render element' => 'element',
                'file' => 'views_ui.theme.inc',
            ],
            'views_ui_rearrange_filter_form' => [
                'render element' => 'form',
                'file' => 'views_ui.theme.inc',
            ],
            'views_ui_expose_filter_form' => [
                'render element' => 'form',
                'file' => 'views_ui.theme.inc',
            ],
            // Legacy theme hook for displaying views info.
'views_ui_view_info' => [
                'variables' => [
                    'view' => NULL,
                    'displays' => NULL,
                ],
                'file' => 'views_ui.theme.inc',
            ],
            // List views.
'views_ui_views_listing_table' => [
                'variables' => [
                    'headers' => NULL,
                    'rows' => NULL,
                    'attributes' => [],
                ],
                'file' => 'views_ui.theme.inc',
            ],
            'views_ui_view_displays_list' => [
                'variables' => [
                    'displays' => [],
                ],
            ],
            // Group of filters.
'views_ui_build_group_filter_form' => [
                'render element' => 'form',
                'file' => 'views_ui.theme.inc',
            ],
            // On behalf of a plugin
'views_ui_style_plugin_table' => [
                'render element' => 'form',
                'file' => 'views_ui.theme.inc',
            ],
            // When previewing a view.
'views_ui_view_preview_section' => [
                'variables' => [
                    'view' => NULL,
                    'section' => NULL,
                    'content' => NULL,
                    'links' => '',
                ],
                'file' => 'views_ui.theme.inc',
            ],
            // Generic container wrapper, to use instead of theme_container when an id
            // is not desired.
'views_ui_container' => [
                'variables' => [
                    'children' => NULL,
                    'attributes' => [],
                ],
                'file' => 'views_ui.theme.inc',
            ],
        ];
    }
    
    /**
     * Implements hook_views_plugins_display_alter().
     */
    public function viewsPluginsDisplayAlter(&$plugins) {
        // Attach contextual links to each display plugin. The links will point to
        // paths underneath "admin/structure/views/view/{$view->id()}" (i.e., paths
        // for editing and performing other contextual actions on the view).
        foreach ($plugins as &$display) {
            $display['contextual links']['entity.view.edit_form'] = [
                'route_name' => 'entity.view.edit_form',
                'route_parameters_names' => [
                    'view' => 'id',
                ],
            ];
        }
    }
    
    /**
     * Implements hook_contextual_links_view_alter().
     */
    public function contextualLinksViewAlter(&$element, $items) {
        // Remove contextual links from being rendered, when so desired, such as
        // within a View preview.
        if (views_ui_contextual_links_suppress()) {
            $element['#links'] = [];
        }
        elseif (!empty($element['#links']['entityviewedit-form'])) {
            $display_id = $items['entity.view.edit_form']['metadata']['display_id'];
            $route_parameters = $element['#links']['entityviewedit-form']['url']->getRouteParameters() + [
                'display_id' => $display_id,
            ];
            $element['#links']['entityviewedit-form']['url'] = Url::fromRoute('entity.view.edit_display_form', $route_parameters);
        }
    }
    
    /**
     * Implements hook_views_analyze().
     *
     * This is the basic views analysis that checks for very minimal problems.
     * There are other analysis tools in core specific sections, such as
     * node.views.inc as well.
     */
    public function viewsAnalyze(ViewExecutable $view) {
        $ret = [];
        // Check for something other than the default display:
        if (count($view->displayHandlers) < 2) {
            $ret[] = Analyzer::formatMessage(t('This view has only a default display and therefore will not be placed anywhere on your site; perhaps you want to add a page or a block display.'), 'warning');
        }
        // If a display has a path, check that it does not match an existing path
        // alias. This results in the path alias not working.
        foreach ($view->displayHandlers as $display) {
            if (empty($display)) {
                continue;
            }
            if ($display->hasPath() && ($path = $display->getOption('path'))) {
                $normal_path = \Drupal::service('path_alias.manager')->getPathByAlias($path);
                if ($path != $normal_path) {
                    $ret[] = Analyzer::formatMessage(t('You have configured display %display with a path which is an path alias as well. This might lead to unwanted effects so better use an internal path.', [
                        '%display' => $display->display['display_title'],
                    ]), 'warning');
                }
            }
        }
        return $ret;
    }
    
    /**
     * Implements hook_entity_operation().
     */
    public function entityOperation(EntityInterface $entity) : array {
        $operations = [];
        if ($entity instanceof BlockInterface) {
            $plugin = $entity->getPlugin();
            if ($plugin->getBaseId() === 'views_block') {
                $view_id_parts = explode('-', $plugin->getDerivativeId());
                $view_id = $view_id_parts[0] ?? '';
                $display_id = $view_id_parts[1] ?? '';
                $view = View::load($view_id);
                if ($view && $view->access('edit')) {
                    $operations['view-edit'] = [
                        'title' => t('Edit view'),
                        'url' => Url::fromRoute('entity.view.edit_display_form', [
                            'view' => $view_id,
                            'display_id' => $display_id,
                        ]),
                        'weight' => 50,
                    ];
                }
            }
        }
        return $operations;
    }

}