class HelpTopicTest

class HelpTopicTest extends BrowserTestBase {
    use AssertBreadcrumbTrait;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'help_topics_test',
        'help',
        'help_topics',
        'block',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * The admin user that will be created.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $adminUser;
    
    /**
     * The anonymous user that will be created.
     *
     * @var \Drupal\user\UserInterface
     */
    protected $anyUser;
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // These tests rely on some markup from the 'Seven' theme and we test theme
        // provided help topics.
        \Drupal::service('theme_installer')->install([
            'seven',
            'help_topics_test_theme',
        ]);
        \Drupal::service('config.factory')->getEditable('system.theme')
            ->set('admin', 'seven')
            ->save();
        // Place various blocks.
        $settings = [
            'theme' => 'seven',
            'region' => 'help',
        ];
        $this->placeBlock('help_block', $settings);
        $this->placeBlock('local_tasks_block', $settings);
        $this->placeBlock('local_actions_block', $settings);
        $this->placeBlock('page_title_block', $settings);
        $this->placeBlock('system_breadcrumb_block', $settings);
        // Create users.
        $this->adminUser = $this->createUser([
            'access administration pages',
            'view the administration theme',
            'administer permissions',
            'administer site configuration',
        ]);
        $this->anyUser = $this->createUser([]);
    }
    
    /**
     * Tests the main help page and individual pages for topics.
     */
    public function testHelp() {
        $session = $this->assertSession();
        // Log in the regular user.
        $this->drupalLogin($this->anyUser);
        $this->verifyHelp(403);
        // Log in the admin user.
        $this->drupalLogin($this->adminUser);
        $this->verifyHelp();
        $this->verifyHelpLinks();
        $this->verifyBreadCrumb();
        // Verify that help topics text appears on admin/help, and cache tags.
        $this->drupalGet('admin/help');
        $session->responseContains('<h2>Topics</h2>');
        $session->pageTextContains('Topics can be provided by modules or themes');
        $session->responseHeaderContains('X-Drupal-Cache-Tags', 'core.extension');
        // Verify links for for help topics and order.
        $page_text = $this->getTextContent();
        $start = strpos($page_text, 'Topics can be provided');
        $pos = $start;
        foreach ($this->getTopicList() as $info) {
            $name = $info['name'];
            $session->linkExists($name);
            $new_pos = strpos($page_text, $name, $start);
            $this->assertTrue($new_pos > $pos, 'Order of ' . $name . ' is correct on page');
            $pos = $new_pos;
        }
        // Ensure the plugin manager alter hook works as expected.
        $session->linkExists('ABC Help Test module');
        \Drupal::state()->set('help_topics_test.test:top_level', FALSE);
        \Drupal::service('plugin.manager.help_topic')->clearCachedDefinitions();
        $this->drupalGet('admin/help');
        $session->linkNotExists('ABC Help Test module');
        \Drupal::state()->set('help_topics_test.test:top_level', TRUE);
        \Drupal::service('plugin.manager.help_topic')->clearCachedDefinitions();
        $this->drupalGet('admin/help');
        // Ensure all the expected links are present before uninstalling.
        $session->linkExists('ABC Help Test module');
        $session->linkExists('ABC Help Test');
        $session->linkExists('XYZ Help Test theme');
        // Uninstall the test module and verify the topics are gone, after
        // reloading page.
        $this->container
            ->get('module_installer')
            ->uninstall([
            'help_topics_test',
        ]);
        $this->drupalGet('admin/help');
        $session->linkNotExists('ABC Help Test module');
        $session->linkNotExists('ABC Help Test');
        $session->linkExists('XYZ Help Test theme');
        // Uninstall the test theme and verify the topic is gone.
        $this->container
            ->get('theme_installer')
            ->uninstall([
            'help_topics_test_theme',
        ]);
        $this->drupalGet('admin/help');
        $session->linkNotExists('XYZ Help Test theme');
    }
    
    /**
     * Verifies the logged in user has access to various help links and pages.
     *
     * @param int $response
     *   (optional) The HTTP response code to test for. If it's 200 (default),
     *   the test verifies the user sees the help; if it's not, it verifies they
     *   are denied access.
     */
    protected function verifyHelp($response = 200) {
        // Verify access to help topic pages.
        foreach ($this->getTopicList() as $topic => $info) {
            // View help topic page.
            $this->drupalGet('admin/help/topic/' . $topic);
            $session = $this->assertSession();
            $session->statusCodeEquals($response);
            if ($response == 200) {
                // Verify page information.
                $name = $info['name'];
                $session->titleEquals($name . ' | Drupal');
                $session->responseContains('<h1 class="page-title">' . $name . '</h1>');
                foreach ($info['tags'] as $tag) {
                    $session->responseHeaderContains('X-Drupal-Cache-Tags', $tag);
                }
            }
        }
    }
    
    /**
     * Verifies links on the test help topic page and other pages.
     *
     * Assumes an admin user is logged in.
     */
    protected function verifyHelpLinks() {
        $session = $this->assertSession();
        // Verify links on the test top-level page.
        $page = 'admin/help/topic/help_topics_test.test';
        $links = [
            'link to the additional topic' => 'Additional topic',
            'Linked topic' => 'This topic is not supposed to be top-level',
            'Additional topic' => 'This topic should get listed automatically',
        ];
        foreach ($links as $link_text => $page_text) {
            $this->drupalGet($page);
            $this->clickLink($link_text);
            $session->pageTextContains($page_text);
        }
        // Verify theme provided help topics work and can be related.
        $this->drupalGet('admin/help/topic/help_topics_test_theme.test');
        $session->pageTextContains('This is a theme provided topic.');
        $this->assertStringContainsString('This is a theme provided topic.', $session->elementExists('css', 'article')
            ->getText());
        $this->clickLink('Additional topic');
        $session->linkExists('XYZ Help Test theme');
        // Verify that the non-top-level topics do not appear on the Help page.
        $this->drupalGet('admin/help');
        $session->linkNotExists('Linked topic');
        $session->linkNotExists('Additional topic');
    }
    
    /**
     * Gets a list of topic IDs to test.
     *
     * @return array
     *   A list of topics to test, in the order in which they should appear. The
     *   keys are the machine names of the topics. The values are arrays with the
     *   following elements:
     *   - name: Displayed name.
     *   - tags: Cache tags to test for.
     */
    protected function getTopicList() {
        return [
            'help_topics_test.test' => [
                'name' => 'ABC Help Test module',
                'tags' => [
                    'core.extension',
                ],
            ],
            'help_topics_derivatives:test_derived_topic' => [
                'name' => 'Label for test_derived_topic',
                'tags' => [
                    'foobar',
                ],
            ],
            'help_topics_test_direct_yml' => [
                'name' => 'Test direct yaml topic label',
                'tags' => [
                    'foobar',
                ],
            ],
        ];
    }
    
    /**
     * Tests breadcrumb on a help topic page.
     */
    public function verifyBreadCrumb() {
        // Verify Help Topics administration breadcrumbs.
        $trail = [
            '' => 'Home',
            'admin' => 'Administration',
            'admin/help' => 'Help',
        ];
        $this->assertBreadcrumb('admin/help/topic/help_topics_test.test', $trail);
        // Ensure we are on the expected help topic page.
        $this->assertSession()
            ->pageTextContains('Also there should be a related topic link below to the Help module topic page and the linked topic.');
        // Verify that another page does not have the help breadcrumb.
        $trail = [
            '' => 'Home',
            'admin' => 'Administration',
            'admin/config' => 'Configuration',
            'admin/config/system' => 'System',
        ];
        $this->assertBreadcrumb('admin/config/system/site-information', $trail);
    }

}