class WorkspaceListBuilder

class WorkspaceListBuilder extends EntityListBuilder {
    use AjaxHelperTrait;
    
    /**
     * The workspace manager service.
     *
     * @var \Drupal\workspaces\WorkspaceManagerInterface
     */
    protected $workspaceManager;
    
    /**
     * The workspace repository service.
     *
     * @var \Drupal\workspaces\WorkspaceRepositoryInterface
     */
    protected $workspaceRepository;
    
    /**
     * The renderer service.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * Constructs a new EntityListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityStorageInterface $storage
     *   The entity storage class.
     * @param \Drupal\workspaces\WorkspaceManagerInterface $workspace_manager
     *   The workspace manager service.
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer service.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityStorageInterface $storage, WorkspaceManagerInterface $workspace_manager, WorkspaceRepositoryInterface $workspace_repository, RendererInterface $renderer) {
        parent::__construct($entity_type, $storage);
        $this->workspaceManager = $workspace_manager;
        $this->workspaceRepository = $workspace_repository;
        $this->renderer = $renderer;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('entity_type.manager')
            ->getStorage($entity_type->id()), $container->get('workspaces.manager'), $container->get('workspaces.repository'), $container->get('renderer'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function load() {
        // Get all the workspace entities and sort them in tree order.
        $workspace_tree = $this->workspaceRepository
            ->loadTree();
        $entities = array_replace($workspace_tree, $this->storage
            ->loadMultiple());
        foreach ($entities as $id => $entity) {
            $entity->_depth = $workspace_tree[$id]['depth'];
        }
        return $entities;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = $this->t('Workspace');
        $header['uid'] = $this->t('Owner');
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        
        /** @var \Drupal\workspaces\WorkspaceInterface $entity */
        if (isset($entity->_depth) && $entity->_depth > 0) {
            $indentation = [
                '#theme' => 'indentation',
                '#size' => $entity->_depth,
            ];
        }
        $row['data'] = [
            'label' => [
                'data' => [
                    '#prefix' => isset($indentation) ? $this->renderer
                        ->render($indentation) : '',
                    '#markup' => $entity->label(),
                ],
            ],
            'owner' => $entity->getOwner()
                ->getDisplayname(),
        ];
        $row['data'] = $row['data'] + parent::buildRow($entity);
        $active_workspace = $this->workspaceManager
            ->getActiveWorkspace();
        if ($active_workspace && $entity->id() === $active_workspace->id()) {
            $row['class'] = 'active-workspace';
        }
        return $row;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        
        /** @var \Drupal\workspaces\WorkspaceInterface $entity */
        $operations = parent::getDefaultOperations($entity);
        if (isset($operations['edit'])) {
            $operations['edit']['query']['destination'] = $entity->toUrl('collection')
                ->toString();
        }
        $active_workspace = $this->workspaceManager
            ->getActiveWorkspace();
        if (!$active_workspace || $entity->id() != $active_workspace->id()) {
            $operations['activate'] = [
                'title' => $this->t('Switch to @workspace', [
                    '@workspace' => $entity->label(),
                ]),
                // Use a weight lower than the one of the 'Edit' operation because we
                // want the 'Activate' operation to be the primary operation.
'weight' => 0,
                'url' => $entity->toUrl('activate-form', [
                    'query' => [
                        'destination' => $entity->toUrl('collection')
                            ->toString(),
                    ],
                ]),
            ];
        }
        if (!$entity->hasParent()) {
            $operations['deploy'] = [
                'title' => $this->t('Deploy content'),
                // The 'Deploy' operation should be the default one for the currently
                // active workspace.
'weight' => $active_workspace && $entity->id() == $active_workspace->id() ? 0 : 20,
                'url' => $entity->toUrl('deploy-form', [
                    'query' => [
                        'destination' => $entity->toUrl('collection')
                            ->toString(),
                    ],
                ]),
            ];
        }
        else {
            
            /** @var \Drupal\workspaces\WorkspaceInterface $parent */
            $parent = $entity->parent->entity;
            $operations['merge'] = [
                'title' => $this->t('Merge into @target_label', [
                    '@target_label' => $parent->label(),
                ]),
                'weight' => 5,
                'url' => Url::fromRoute('entity.workspace.merge_form', [
                    'source_workspace' => $entity->id(),
                    'target_workspace' => $parent->id(),
                ], [
                    'query' => [
                        'destination' => $entity->toUrl('collection')
                            ->toString(),
                    ],
                ]),
            ];
        }
        return $operations;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        $build = parent::render();
        if ($this->isAjax()) {
            $this->offCanvasRender($build);
        }
        else {
            $build['#attached'] = [
                'library' => [
                    'workspaces/drupal.workspaces.overview',
                ],
            ];
        }
        return $build;
    }
    
    /**
     * Renders the off canvas elements.
     *
     * @param array $build
     *   A render array.
     */
    protected function offCanvasRender(array &$build) {
        $active_workspace = $this->workspaceManager
            ->getActiveWorkspace();
        if ($active_workspace) {
            $active_workspace_classes = [
                'active-workspace--not-default',
                'active-workspace--' . $active_workspace->id(),
            ];
        }
        else {
            $active_workspace_classes = [
                'active-workspace--default',
            ];
        }
        $build['active_workspace'] = [
            '#type' => 'container',
            '#weight' => -20,
            '#attributes' => [
                'class' => array_merge([
                    'active-workspace',
                ], $active_workspace_classes),
            ],
            'title' => [
                '#type' => 'html_tag',
                '#tag' => 'div',
                '#value' => $this->t('Current workspace:'),
                '#attributes' => [
                    'class' => 'active-workspace__title',
                ],
            ],
            'label' => [
                '#type' => 'container',
                '#attributes' => [
                    'class' => 'active-workspace__label',
                ],
                'value' => [
                    '#type' => 'html_tag',
                    '#tag' => 'span',
                    '#value' => $active_workspace ? $active_workspace->label() : $this->t('Live'),
                ],
            ],
        ];
        if ($active_workspace) {
            $build['active_workspace']['label']['manage'] = [
                '#type' => 'link',
                '#title' => $this->t('Manage workspace'),
                '#url' => $active_workspace->toUrl('edit-form'),
                '#attributes' => [
                    'class' => [
                        'active-workspace__manage',
                    ],
                ],
            ];
            $build['active_workspace']['actions'] = [
                '#type' => 'container',
                '#weight' => 20,
                '#attributes' => [
                    'class' => [
                        'active-workspace__actions',
                    ],
                ],
            ];
            if (!$active_workspace->hasParent()) {
                $build['active_workspace']['actions']['deploy'] = [
                    '#type' => 'link',
                    '#title' => $this->t('Deploy content'),
                    '#url' => $active_workspace->toUrl('deploy-form', [
                        'query' => [
                            'destination' => $active_workspace->toUrl('collection')
                                ->toString(),
                        ],
                    ]),
                    '#attributes' => [
                        'class' => [
                            'button',
                            'active-workspace__button',
                        ],
                    ],
                ];
            }
            else {
                $build['active_workspace']['actions']['merge'] = [
                    '#type' => 'link',
                    '#title' => $this->t('Merge content'),
                    '#url' => Url::fromRoute('entity.workspace.merge_form', [
                        'source_workspace' => $active_workspace->id(),
                        'target_workspace' => $active_workspace->parent->target_id,
                    ], [
                        'query' => [
                            'destination' => $active_workspace->toUrl('collection')
                                ->toString(),
                        ],
                    ]),
                    '#attributes' => [
                        'class' => [
                            'button',
                            'active-workspace__button',
                        ],
                    ],
                ];
            }
        }
        $items = [];
        $rows = array_slice($build['table']['#rows'], 0, 5, TRUE);
        foreach ($rows as $id => $row) {
            if (!$active_workspace || $active_workspace->id() !== $id) {
                $url = Url::fromRoute('entity.workspace.activate_form', [
                    'workspace' => $id,
                ], [
                    'query' => $this->getDestinationArray(),
                ]);
                $items[] = [
                    '#type' => 'link',
                    '#title' => ltrim($row['data']['label']['data']['#markup']),
                    '#url' => $url,
                    '#attributes' => [
                        'class' => [
                            'use-ajax',
                            'workspaces__item',
                            'workspaces__item--not-default',
                        ],
                        'data-dialog-type' => 'modal',
                        'data-dialog-options' => Json::encode([
                            'width' => 500,
                        ]),
                    ],
                ];
            }
        }
        // Add an item for switching to Live.
        if ($active_workspace) {
            $items[] = [
                '#type' => 'link',
                '#title' => $this->t('Live'),
                '#url' => Url::fromRoute('workspaces.switch_to_live', [], [
                    'query' => $this->getDestinationArray(),
                ]),
                '#attributes' => [
                    'class' => [
                        'use-ajax',
                        'workspaces__item',
                        'workspaces__item--default',
                    ],
                    'data-dialog-type' => 'modal',
                    'data-dialog-options' => Json::encode([
                        'width' => 500,
                    ]),
                ],
            ];
        }
        $build['workspaces_list'] = [
            '#type' => 'container',
            '#attributes' => [
                'class' => 'workspaces',
            ],
        ];
        $build['workspaces_list']['workspaces'] = [
            '#theme' => 'item_list',
            '#title' => $this->t('Other workspaces:'),
            '#items' => $items,
            '#wrapper_attributes' => [
                'class' => [
                    'workspaces__list',
                ],
            ],
            '#cache' => [
                'contexts' => $this->entityType
                    ->getListCacheContexts(),
                'tags' => $this->entityType
                    ->getListCacheTags(),
            ],
        ];
        $build['workspaces_list']['all_workspaces'] = [
            '#type' => 'link',
            '#title' => $this->t('View all workspaces'),
            '#url' => Url::fromRoute('entity.workspace.collection'),
            '#attributes' => [
                'class' => [
                    'all-workspaces',
                ],
            ],
        ];
        unset($build['table']);
        unset($build['pager']);
    }

}