class BookBreadcrumbTest

class BookBreadcrumbTest extends BrowserTestBase {
    
    /**
     * Modules to install.
     *
     * @var array
     */
    protected static $modules = [
        'book',
        'block',
        'book_breadcrumb_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * A book node.
     *
     * @var \Drupal\node\NodeInterface
     */
    protected $book;
    
    /**
     * A user with permission to create and edit books.
     *
     * @var \Drupal\user\Entity\User
     */
    protected $bookAuthor;
    
    /**
     * A user without the 'node test view' permission.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $webUserWithoutNodeAccess;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->drupalPlaceBlock('system_breadcrumb_block');
        $this->drupalPlaceBlock('page_title_block');
        // Create users.
        $this->bookAuthor = $this->drupalCreateUser([
            'create new books',
            'create book content',
            'edit own book content',
            'add content to books',
        ]);
    }
    
    /**
     * Creates a new book with a page hierarchy.
     *
     * @return \Drupal\node\NodeInterface[]
     *   The created book nodes.
     */
    protected function createBreadcrumbBook() {
        // Create new book.
        $this->drupalLogin($this->bookAuthor);
        $this->book = $this->createBookNode('new');
        $book = $this->book;
        
        /*
         * Add page hierarchy to book.
         * Book
         *  |- Node 0
         *   |- Node 1
         *   |- Node 2
         *    |- Node 3
         *     |- Node 4
         *      |- Node 5
         *  |- Node 6
         */
        $nodes = [];
        $nodes[0] = $this->createBookNode($book->id());
        $nodes[1] = $this->createBookNode($book->id(), $nodes[0]->id());
        $nodes[2] = $this->createBookNode($book->id(), $nodes[0]->id());
        $nodes[3] = $this->createBookNode($book->id(), $nodes[2]->id());
        $nodes[4] = $this->createBookNode($book->id(), $nodes[3]->id());
        $nodes[5] = $this->createBookNode($book->id(), $nodes[4]->id());
        $nodes[6] = $this->createBookNode($book->id());
        $this->drupalLogout();
        return $nodes;
    }
    
    /**
     * Creates a book node.
     *
     * @param int|string $book_nid
     *   A book node ID or set to 'new' to create a new book.
     * @param int|null $parent
     *   (optional) Parent book reference ID. Defaults to NULL.
     *
     * @return \Drupal\node\NodeInterface
     *   The created node.
     */
    protected function createBookNode($book_nid, $parent = NULL) {
        // $number does not use drupal_static as it should not be reset since it
        // uniquely identifies each call to createBookNode(). It is used to ensure
        // that when sorted nodes stay in same order.
        static $number = 0;
        $edit = [];
        $edit['title[0][value]'] = str_pad((string) $number, 2, '0', STR_PAD_LEFT) . ' - test node ' . $this->randomMachineName(10);
        $edit['body[0][value]'] = 'test body ' . $this->randomMachineName(32) . ' ' . $this->randomMachineName(32);
        $edit['book[bid]'] = $book_nid;
        if ($parent !== NULL) {
            $this->drupalGet('node/add/book');
            $this->submitForm($edit, 'Change book (update list of parents)');
            $edit['book[pid]'] = $parent;
            $this->submitForm($edit, 'Save');
            // Make sure the parent was flagged as having children.
            $parent_node = \Drupal::entityTypeManager()->getStorage('node')
                ->loadUnchanged($parent);
            $this->assertNotEmpty($parent_node->book['has_children'], 'Parent node is marked as having children');
        }
        else {
            $this->drupalGet('node/add/book');
            $this->submitForm($edit, 'Save');
        }
        // Check to make sure the book node was created.
        $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
        $this->assertNotNull($node === FALSE ? NULL : $node, 'Book node found in database.');
        $number++;
        return $node;
    }
    
    /**
     * Tests that the breadcrumb is updated when book content changes.
     */
    public function testBreadcrumbTitleUpdates() {
        // Create a new book.
        $nodes = $this->createBreadcrumbBook();
        $book = $this->book;
        $this->drupalLogin($this->bookAuthor);
        $this->drupalGet($nodes[4]->toUrl());
        // Fetch each node title in the current breadcrumb.
        $links = $this->xpath('//nav[@aria-labelledby="system-breadcrumb"]/ol/li/a');
        $got_breadcrumb = [];
        foreach ($links as $link) {
            $got_breadcrumb[] = $link->getText();
        }
        // Home link and four parent book nodes should be in the breadcrumb.
        $this->assertCount(5, $got_breadcrumb);
        $this->assertEquals($nodes[3]->getTitle(), end($got_breadcrumb));
        $edit = [
            'title[0][value]' => 'Updated node5 title',
        ];
        $this->drupalGet($nodes[3]->toUrl('edit-form'));
        $this->submitForm($edit, 'Save');
        $this->drupalGet($nodes[4]->toUrl());
        // Fetch each node title in the current breadcrumb.
        $links = $this->xpath('//nav[@aria-labelledby="system-breadcrumb"]/ol/li/a');
        $got_breadcrumb = [];
        foreach ($links as $link) {
            $got_breadcrumb[] = $link->getText();
        }
        $this->assertCount(5, $got_breadcrumb);
        $this->assertEquals($edit['title[0][value]'], end($got_breadcrumb));
    }
    
    /**
     * Tests that the breadcrumb is updated when book access changes.
     */
    public function testBreadcrumbAccessUpdates() {
        // Create a new book.
        $nodes = $this->createBreadcrumbBook();
        $this->drupalLogin($this->bookAuthor);
        $edit = [
            'title[0][value]' => "you can't see me",
        ];
        $this->drupalGet($nodes[3]->toUrl('edit-form'));
        $this->submitForm($edit, 'Save');
        $this->drupalGet($nodes[4]->toUrl());
        $links = $this->xpath('//nav[@aria-labelledby="system-breadcrumb"]/ol/li/a');
        $got_breadcrumb = [];
        foreach ($links as $link) {
            $got_breadcrumb[] = $link->getText();
        }
        $this->assertCount(5, $got_breadcrumb);
        $this->assertEquals($edit['title[0][value]'], end($got_breadcrumb));
        $config = $this->container
            ->get('config.factory')
            ->getEditable('book_breadcrumb_test.settings');
        $config->set('hide', TRUE)
            ->save();
        $this->drupalGet($nodes[4]->toUrl());
        $links = $this->xpath('//nav[@aria-labelledby="system-breadcrumb"]/ol/li/a');
        $got_breadcrumb = [];
        foreach ($links as $link) {
            $got_breadcrumb[] = $link->getText();
        }
        $this->assertCount(4, $got_breadcrumb);
        $this->assertEquals($nodes[2]->getTitle(), end($got_breadcrumb));
        $this->drupalGet($nodes[3]->toUrl());
        $this->assertSession()
            ->statusCodeEquals(403);
    }

}