class OffCanvasTestBase

abstract class OffCanvasTestBase extends WebDriverTestBase {
    use OffCanvasTestTrait;
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'off_canvas_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function drupalGet($path, array $options = [], array $headers = []) {
        $return = parent::drupalGet($path, $options, $headers);
        $this->assertPageLoadComplete();
        return $return;
    }
    
    /**
     * Assert the page is completely loaded.
     *
     * Ajax requests may happen after page loads. Also for users who have access
     * to contextual links the contextual link placeholders will be filled after
     * the page is received.
     */
    protected function assertPageLoadComplete() {
        if ($this->loggedInUser && $this->loggedInUser
            ->hasPermission('access contextual links')) {
            $this->assertAllContextualLinksLoaded();
        }
    }
    
    /**
     * Assert all contextual link areas have be loaded.
     *
     * Contextual link placeholders will be filled after
     * the page is received.
     *
     * @todo Move this function to https://www.drupal.org/node/2821724.
     */
    protected function assertAllContextualLinksLoaded() {
        $this->assertSession()
            ->assertNoElementAfterWait('css', '[data-contextual-id]:empty');
    }
    
    /**
     * Enables a theme.
     *
     * @param string $theme
     *   The theme.
     */
    protected function enableTheme($theme) {
        // Enable the theme.
        \Drupal::service('theme_installer')->install([
            $theme,
        ]);
        $theme_config = \Drupal::configFactory()->getEditable('system.theme');
        $theme_config->set('default', $theme);
        $theme_config->save();
    }
    
    /**
     * Waits for off-canvas dialog to open.
     *
     * @param string $position
     *   The position of the dialog.
     *
     * @throws \Behat\Mink\Exception\ElementNotFoundException
     */
    protected function waitForOffCanvasToOpen($position = 'side') {
        $this->waitForOffCanvasArea();
        // Check that the canvas is positioned on the side.
        $this->assertSession()
            ->elementExists('css', '.ui-dialog-position-' . $position);
    }
    
    /**
     * Waits for off-canvas dialog to close.
     */
    protected function waitForOffCanvasToClose() {
        $this->assertSession()
            ->assertNoElementAfterWait('css', '#drupal-off-canvas');
    }
    
    /**
     * Gets the off-canvas dialog element.
     *
     * @return \Behat\Mink\Element\NodeElement|null
     */
    protected function getOffCanvasDialog() {
        $off_canvas_dialog = $this->getSession()
            ->getPage()
            ->find('css', '.ui-dialog[aria-describedby="drupal-off-canvas"]');
        $this->assertEquals(FALSE, empty($off_canvas_dialog), 'The off-canvas dialog was found.');
        return $off_canvas_dialog;
    }
    
    /**
     * Get themes to test.
     *
     * @return string[]
     *   Theme names to test.
     */
    protected static function getTestThemes() {
        return [
            'claro',
            'olivero',
            'stable9',
            'stark',
        ];
    }
    
    /**
     * Asserts the specified selector is visible after a wait.
     *
     * @param string $selector
     *   The selector engine name. See ElementInterface::findAll() for the
     *   supported selectors.
     * @param string|array $locator
     *   The selector locator.
     * @param int $timeout
     *   (Optional) Timeout in milliseconds, defaults to 10000.
     */
    protected function assertElementVisibleAfterWait($selector, $locator, $timeout = 10000) {
        $this->assertSession()
            ->assertWaitOnAjaxRequest();
        $this->assertNotEmpty($this->assertSession()
            ->waitForElementVisible($selector, $locator, $timeout));
    }
    
    /**
     * Data provider that returns theme name as the sole argument.
     */
    public static function themeDataProvider() {
        $themes = static::getTestThemes();
        $data = [];
        foreach ($themes as $theme) {
            $data[$theme] = [
                $theme,
            ];
        }
        return $data;
    }

}