<?php

namespace App\Tests;

use App\Content\Consent;
use App\Content\CustomCode;
use App\Content\DemoContent;
use App\Content\DocumentValidator;
use App\Content\MediaLibrary;
use App\Content\MenuRepository;
use App\Content\PageRepository;
use App\Content\PartialRepository;
use App\Content\PostRepository;
use App\Content\RedirectRepository;
use App\Content\RichText;
use App\Content\SiteSettings;
use App\Content\Theme;
use App\Domain\InvalidDocument;
use App\Domain\InvalidMenu;
use App\Domain\InvalidPage;
use App\Domain\StaleWrite;
use App\Infrastructure\ConnectionFactory;
use App\Kernel;
use Doctrine\DBAL\Connection;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

final class CmsTest extends TestCase
{
    private Connection $db;
    private PageRepository $pages;
    private MenuRepository $menus;
    private PostRepository $posts;
    private SiteSettings $site;
    private RedirectRepository $redirects;
    private Theme $themes;
    private PartialRepository $partials;
    private string $path;

    protected function setUp(): void
    {
        $this->path = tempnam(sys_get_temp_dir(), 'kant-test-');
        $this->db = ConnectionFactory::create('sqlite:///'.str_replace('\\', '/', $this->path));
        TestSchema::build($this->db);
        $this->db->insert('website', ['id' => 'default', 'name' => 'KantSites', 'default_locale' => 'de', 'theme' => '{}']);
        foreach (['page-1' => 'home', 'page-2' => 'private'] as $id => $slug) {
            $this->db->insert('page', ['id' => $id, 'slug' => $slug, 'path' => $slug, 'type' => 'page', 'locale' => 'de', 'website_id' => 'default', 'version' => 0, 'created_at' => gmdate('Y-m-d H:i:s')]);
        }
        $this->pages = new PageRepository($this->db, new DocumentValidator(), new SiteSettings($this->db));
        $this->menus = new MenuRepository($this->db, new SiteSettings($this->db));
        $this->posts = new PostRepository($this->db, new MediaLibrary($this->db, $this->path.'-media'), new SiteSettings($this->db));
        $this->site = new SiteSettings($this->db);
        $this->redirects = new RedirectRepository($this->db);
        $this->themes = new Theme($this->db);
        $this->partials = new PartialRepository($this->db, new DocumentValidator());
        // A real installation has a header and a footer; the navigation lives in the header area.
        foreach (DemoContent::areas() as $kind => $area) {
            $this->partials->create($kind, 'default', $area['name'], $area['document']);
        }
    }

    protected function tearDown(): void
    {
        $this->db->close();
        gc_collect_cycles();
        // Each request() boots its own kernel with its own connection to the same file. On Windows
        // the handle is sometimes released a moment after the kernel is gone, so a single unlink
        // can fail on a database that is otherwise finished with. Retry briefly, then leave the
        // temporary file to the operating system rather than failing a passing test.
        for ($attempt = 0; $attempt < 20 && file_exists($this->path); ++$attempt) {
            if (@unlink($this->path)) {
                return;
            }
            usleep(25000);
        }
    }

    public function testDocumentRoundTripAndDraftPrivacy(): void
    {
        $document = DemoContent::pages()['home'];
        $id = $this->pages->saveDraft('page-1', $document, 0);
        self::assertNull($this->pages->findPublished('home'));
        self::assertSame($document, json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$id]), true));
        $this->pages->publish('page-1', $id, 1);
        self::assertSame($document, $this->pages->findPublished('home')['document']);
        $document['title'] = 'Private change';
        $this->pages->saveDraft('page-1', $document, 2);
        self::assertNotSame('Private change', $this->pages->findPublished('home')['document']['title']);
    }

    public function testStaleSaveRollsBackWithoutOrphanRevision(): void
    {
        $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0);
        try {
            $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0);
            self::fail('Stale write was accepted.');
        } catch (StaleWrite) {
            self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision'));
            self::assertSame(1, (int) $this->db->fetchOne('SELECT version FROM page WHERE id = ?', ['page-1']));
        }
    }

    public function testForeignRevisionCannotBePublished(): void
    {
        $id = $this->pages->saveDraft('page-2', DemoContent::pages()['home'], 0);
        $this->expectException(\InvalidArgumentException::class);
        $this->pages->publish('page-1', $id, 0);
    }

    public function testPublicationRejectsStaleVersion(): void
    {
        $id = $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0);
        $this->expectException(StaleWrite::class);
        $this->pages->publish('page-1', $id, 0);
    }

    public function testPublishedRevisionCanBeRestoredAndImmediatelyChangesOutput(): void
    {
        $original = DemoContent::pages()['home'];
        $first = $this->pages->saveDraft('page-1', $original, 0);
        $this->pages->publish('page-1', $first, 1);
        $changed = $original;
        $changed['title'] = 'Second revision';
        $second = $this->pages->saveDraft('page-1', $changed, 2);
        $this->pages->publish('page-1', $second, 3);
        self::assertSame('Second revision', $this->pages->findPublished('home')['document']['title']);
        $this->pages->publish('page-1', $first, 4);
        self::assertSame($original, $this->pages->findPublished('home')['document']);
        self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision'));
    }

    public static function invalidDocuments(): iterable
    {
        $base = DemoContent::pages()['home'];
        $bad = $base;
        $bad['schemaVersion'] = 999;
        yield 'future schema' => [$bad];
        $bad = $base;
        $bad['blocks'][] = $base['blocks'][0];
        yield 'duplicate IDs' => [$bad];
        foreach (['javascript:alert(1)', 'data:text/html,hi', '//evil.test', '/\\evil.test', "https://example.test/\nfoo"] as $url) {
            $bad = $base;
            $bad['blocks'][0]['children'][3]['props']['href'] = $url;
            yield $url => [$bad];
        }
        $bad = $base;
        $bad['blocks'][0]['layout']['tone'] = '" onclick="alert(1)';
        yield 'style injection' => [$bad];
        foreach ([['desktop' => ['paddingY' => 'url(evil)']], ['watch' => []], ['mobile' => ['columns' => 'two']], ['desktop' => ['unknown' => 'small']], ['mobile' => ['paddingY' => []]]] as $design) {
            $bad = $base;
            $bad['schemaVersion'] = 2;
            $bad['blocks'][0]['layout']['design'] = $design;
            yield 'invalid responsive design '.json_encode($design) => [$bad];
        }
        $bad = $base;
        $bad['blocks'][0]['layout']['design'] = ['desktop' => ['paddingY' => 'large']];
        yield 'v1 cannot silently use v2 settings' => [$bad];
        foreach ([2, 3] as $version) {
            $bad = $base;
            $bad['schemaVersion'] = $version;
            $bad['blocks'][0]['layout']['effects'] = ['shadow' => 2 === $version ? 'soft' : 'evil'];
            yield 'invalid effect version '.$version => [$bad];
        }
        $bad = $base;
        $bad['schemaVersion'] = 3;
        $bad['blocks'][] = ['id' => 'gallery', 'type' => 'gallery', 'children' => [$base['blocks'][0]]];
        yield 'gallery forbids containers' => [$bad];
        $bad = $base;
        $bad['blocks'][] = ['id' => 'gallery', 'type' => 'gallery', 'children' => []];
        yield 'gallery requires v3' => [$bad];
        foreach (['javascript:alert(1)', '/image,400w'] as $source) {
            $bad = $base;
            $bad['schemaVersion'] = 3;
            $bad['blocks'][] = ['id' => 'unsafe-image', 'type' => 'image', 'props' => ['src' => '/safe.png', 'alt' => 'Test', 'decorative' => false, 'width' => 400, 'height' => 300, 'sources' => [['src' => $source, 'width' => 400]]]];
            yield 'unsafe srcset '.$source => [$bad];
        }
        $bad = $base;
        $bad['blocks'][0]['children'][1]['props']['level'] = 9;
        yield 'invalid heading' => [$bad];
        $bad = $base;
        $bad['blocks'][0]['children'][0]['type'] = 'unknown-plugin';
        yield 'unnamespaced unknown type stays rejected' => [$bad];
        foreach (['Acme.Slider', 'acme.', '.slider', 'acme..slider', 'acme.slider.extra', 'acme/slider'] as $type) {
            $bad = $base;
            $bad['schemaVersion'] = 4;
            $bad['blocks'][0]['children'][0]['type'] = $type;
            yield 'malformed plugin type '.$type => [$bad];
        }
        $bad = $base;
        $bad['blocks'][0]['children'][0]['type'] = 'acme.slider';
        yield 'plugin block needs schema v4' => [$bad];
        $bad = $base;
        $bad['blocks'][0]['children'][] = ['id' => 'image', 'type' => 'image', 'props' => ['src' => '/image.png', 'alt' => '', 'decorative' => false, 'width' => 100, 'height' => 100]];
        yield 'missing meaningful alt' => [$bad];
    }

    #[DataProvider('invalidDocuments')]
    public function testRejectsInvalidDocumentsBeforeWriting(array $document): void
    {
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testInitialHtmlEscapesContentAndHasNoEditorScripts(): void
    {
        $document = DemoContent::pages()['home'];
        $document['blocks'][0]['children'][0]['props']['text'] = '<script>alert("xss")</script>';
        $id = $this->pages->saveDraft('page-1', $document, 0);
        $this->pages->publish('page-1', $id, 1);
        $response = $this->request('/');
        self::assertSame(200, $response->getStatusCode());
        self::assertStringContainsString('&lt;script&gt;', $response->getContent());
        self::assertStringNotContainsString('<script', $response->getContent());
        self::assertStringContainsString('<h1', $response->getContent());
        self::assertStringContainsString('rel="canonical" href="https://cms.test/"', $response->getContent());
        self::assertStringContainsString('no-store', $response->headers->get('Cache-Control'));
    }

    public function testResponsiveRevisionPreservesOriginalAndRendersSafeClasses(): void
    {
        $original = DemoContent::pages()['home'];
        $old = $this->pages->saveDraft('page-1', $original, 0);
        $this->pages->publish('page-1', $old, 1);
        $document = $original;
        $document['schemaVersion'] = 2;
        $document['blocks'][0]['layout']['design'] = ['desktop' => ['paddingY' => 'huge'], 'mobile' => ['paddingY' => 'small']];
        $document['blocks'][0]['children'][1]['layout']['design'] = ['desktop' => ['fontSize' => 'hero'], 'mobile' => ['fontSize' => 'title']];
        $new = $this->pages->saveDraft('page-1', $document, 2);
        self::assertSame($original, $this->pages->findPublished('home')['document']);
        self::assertSame($document, $this->pages->findForEditor('page-1')['document']);
        $this->pages->publish('page-1', $new, 3);
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('d-mobile-paddingY-small', $html);
        self::assertStringContainsString('d-desktop-fontSize-hero d-mobile-fontSize-title', $html);
        self::assertStringContainsString('/assets/design.css', $html);
        self::assertStringNotContainsString('style=', $html);
        self::assertStringNotContainsString('<script', $html);
        $this->pages->publish('page-1', $old, 4);
        self::assertSame($original, $this->pages->findPublished('home')['document']);
        self::assertStringNotContainsString('/assets/design.css', $this->request('/')->getContent());
    }

    public function testDraftAndUnknownUrlsAre404AndWritesAreNotExposed(): void
    {
        $this->pages->saveDraft('page-2', DemoContent::pages()['home'], 0);
        foreach (['/private', '/missing', '/editor'] as $url) {
            self::assertSame(404, $this->request($url)->getStatusCode());
        }
        self::assertSame(405, $this->request('/', 'POST')->getStatusCode());
    }

    public function testHomeAliasRedirectsToCanonical(): void
    {
        $response = $this->request('/home');
        self::assertSame(301, $response->getStatusCode());
        self::assertSame('/', $response->headers->get('Location'));
    }

    public function testCreatedPageStaysPrivateUntilPublishedAndKeepsItsAddress(): void
    {
        $id = $this->pages->createPage('ueber-uns', null, 'page', DemoContent::starter('Über uns'));
        self::assertSame(404, $this->request('/ueber-uns')->getStatusCode());
        $page = $this->pages->findForEditor($id);
        self::assertSame('Über uns', $page['document']['title']);
        $this->pages->publish($id, $page['draft_revision_id'], $page['version']);
        $response = $this->request('/ueber-uns');
        self::assertSame(200, $response->getStatusCode());
        self::assertStringContainsString('>Über uns</h1>', $response->getContent());
        self::assertStringContainsString('href="https://cms.test/ueber-uns"', $response->getContent());
    }

    public function testChildPagesBuildNestedPathsAndSiblingSlugsStayIndependent(): void
    {
        $parent = $this->pages->createPage('leistungen', null, 'page', DemoContent::starter('Leistungen'));
        $child = $this->pages->createPage('webdesign', $parent, 'page', DemoContent::starter('Webdesign'));
        $other = $this->pages->createPage('beratung', null, 'page', DemoContent::starter('Beratung'));
        // The same slug under a different parent is a different page, not a collision.
        $twin = $this->pages->createPage('webdesign', $other, 'page', DemoContent::starter('Webdesign kompakt'));
        foreach ([$parent => 'leistungen', $child => 'leistungen/webdesign', $twin => 'beratung/webdesign'] as $id => $path) {
            $draft = $this->pages->findForEditor($id);
            $this->pages->publish($id, $draft['draft_revision_id'], $draft['version']);
            self::assertSame(200, $this->request('/'.$path)->getStatusCode(), $path);
        }
        self::assertSame('Webdesign', $this->pages->findPublished('leistungen/webdesign')['document']['title']);
        self::assertSame('Webdesign kompakt', $this->pages->findPublished('beratung/webdesign')['document']['title']);
    }

    /**
     * @return iterable<string, array{string, string|null, string}>
     */
    public static function rejectedPages(): iterable
    {
        yield 'uppercase slug' => ['Über Uns', null, 'page'];
        yield 'path separator in slug' => ['a/b', null, 'page'];
        yield 'empty slug' => ['', null, 'page'];
        yield 'reserved slug' => ['admin', null, 'page'];
        yield 'unknown type' => ['gueltig', null, 'template'];
        yield 'missing parent' => ['gueltig', 'does-not-exist', 'page'];
    }

    #[DataProvider('rejectedPages')]
    public function testRejectsInvalidAddressesWithoutWriting(string $slug, ?string $parent, string $type): void
    {
        $before = (int) $this->db->fetchOne('SELECT COUNT(*) FROM page');
        try {
            $this->pages->createPage($slug, $parent, $type, DemoContent::starter('Titel'));
            self::fail('Expected the page to be rejected.');
        } catch (InvalidPage) {
        }
        self::assertSame($before, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page'));
    }

    public function testDuplicateAddressAndExcessiveDepthAreRejected(): void
    {
        $this->pages->createPage('kontakt', null, 'page', DemoContent::starter('Kontakt'));
        $this->expectException(InvalidPage::class);
        $this->pages->createPage('kontakt', null, 'page', DemoContent::starter('Kontakt erneut'));
    }

    public function testHierarchyStopsAtTheDocumentedDepthAndPostsTakeNoChildren(): void
    {
        $id = null;
        for ($level = 1; $level <= PageRepository::MAX_DEPTH; ++$level) {
            $id = $this->pages->createPage('ebene-'.$level, $id, 'page', DemoContent::starter('Ebene '.$level));
        }
        try {
            $this->pages->createPage('zu-tief', $id, 'page', DemoContent::starter('Zu tief'));
            self::fail('Expected the depth limit to apply.');
        } catch (InvalidPage) {
        }
        $post = $this->pages->createPage('erster-beitrag', null, 'post', DemoContent::starter('Erster Beitrag', 'post'));
        $this->expectException(InvalidPage::class);
        $this->pages->createPage('unter-beitrag', $post, 'page', DemoContent::starter('Unter Beitrag'));
    }

    public function testDeleteRemovesEveryRevisionButRefusesStaleVersionsAndParents(): void
    {
        $parent = $this->pages->createPage('eltern', null, 'page', DemoContent::starter('Eltern'));
        $child = $this->pages->createPage('kind', $parent, 'page', DemoContent::starter('Kind'));
        $version = $this->pages->findForEditor($parent)['version'];
        try {
            $this->pages->deletePage($parent, $version);
            self::fail('Expected the parent to be protected.');
        } catch (InvalidPage) {
        }
        self::assertNotNull($this->pages->findForEditor($parent));

        $childVersion = $this->pages->findForEditor($child)['version'];
        try {
            $this->pages->deletePage($child, $childVersion - 1);
            self::fail('Expected a stale delete to be refused.');
        } catch (StaleWrite) {
        }
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision WHERE page_id = ?', [$child]));

        $this->pages->deletePage($child, $childVersion);
        self::assertNull($this->pages->findForEditor($child));
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision WHERE page_id = ?', [$child]));
        // Deleting the child frees the parent and leaves every other page untouched.
        $this->pages->deletePage($parent, $this->pages->findForEditor($parent)['version']);
        self::assertSame(['home', 'private'], $this->db->fetchFirstColumn('SELECT slug FROM page ORDER BY slug'));
    }

    public function testCmsRoutesAreNotSwallowedByThePublicPathRoute(): void
    {
        // The catch-all would otherwise answer these as a missing public page with 404.
        foreach (['/admin', '/admin/media'] as $url) {
            self::assertSame(302, $this->request($url)->getStatusCode(), $url);
        }
        self::assertStringContainsString('name="_username"', $this->request('/admin/login')->getContent());
    }

    public function testPluginBlocksSurviveSavePublishAndReloadWithoutRenderingTheirProps(): void
    {
        $document = DemoContent::starter('Mit Erweiterung');
        $document['schemaVersion'] = 4;
        $document['blocks'][] = [
            'id' => 'plugin-block', 'type' => 'acme.slider',
            'props' => ['slides' => [['src' => 'javascript:alert(1)', 'headline' => 'MARKER_FROM_PLUGIN_PROPS']], 'autoplay' => true],
            'children' => [['id' => 'plugin-child', 'type' => 'text', 'props' => ['text' => 'MARKER_INSIDE_PLUGIN']]],
        ];
        $revision = $this->pages->saveDraft('page-1', $document, 0);
        // Stored byte for byte: a page must never lose content because a plugin is absent.
        self::assertSame($document, json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$revision]), true));
        $this->pages->publish('page-1', $revision, 1);
        self::assertSame($document, $this->pages->findPublished('home')['document']);
        self::assertSame($document, $this->pages->findForEditor('page-1')['document']);

        $html = $this->request('/')->getContent();
        self::assertSame(200, $this->request('/')->getStatusCode());
        // The core knows no schema for these props, so none of them may reach the output.
        self::assertStringNotContainsString('MARKER_FROM_PLUGIN_PROPS', $html);
        self::assertStringNotContainsString('MARKER_INSIDE_PLUGIN', $html);
        self::assertStringNotContainsString('javascript:', $html);
        self::assertStringNotContainsString('block-unavailable', $html);
        self::assertStringContainsString('<!-- Block plugin-block (acme.slider)', $html);
        // The rest of the page still renders.
        self::assertStringContainsString('>Mit Erweiterung</h1>', $html);
    }

    public function testMenuRendersPageAnchorAndExternalTargetsWithCurrentMarker(): void
    {
        $about = $this->publishedPage('ueber-uns', 'Ueber uns');
        $this->menus->save('header', 'Hauptnavigation', [
            ['label' => 'Start', 'type' => 'page', 'pageId' => 'page-1', 'anchor' => '', 'children' => [
                ['label' => 'Kontakt', 'type' => 'page', 'pageId' => 'page-1', 'anchor' => 'kontakt', 'children' => []],
            ]],
            ['label' => 'Ueber uns', 'type' => 'page', 'pageId' => $about, 'anchor' => '', 'children' => []],
            ['label' => 'HausKlar', 'type' => 'url', 'url' => 'https://hausklar.app', 'children' => []],
            ['label' => 'Anrufen', 'type' => 'url', 'url' => 'tel:+4972219957150', 'children' => []],
        ], 0);
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);

        $html = $this->request('/')->getContent();
        self::assertStringContainsString('href="/#kontakt"', $html);
        self::assertStringContainsString('href="/ueber-uns"', $html);
        self::assertStringContainsString('href="https://hausklar.app"', $html);
        self::assertStringContainsString('href="tel:+4972219957150"', $html);
        // The home link is the current page; an anchor inside it is not.
        self::assertSame(1, substr_count($html, 'aria-current="page"'));
        self::assertStringContainsString('<a href="/" aria-current="page">Start</a>', $html);

        // On another page the marker moves and nothing else changes.
        $other = $this->request('/ueber-uns')->getContent();
        self::assertStringContainsString('<a href="/ueber-uns" aria-current="page">Ueber uns</a>', $other);
        self::assertStringNotContainsString('<a href="/" aria-current="page">', $other);
    }

    public function testMenuSurvivesDeletedAndUnpublishedPagesWithoutLosingOtherEntries(): void
    {
        $doomed = $this->publishedPage('temporaer', 'Temporaer');
        $draft = $this->pages->createPage('entwurf', null, 'page', DemoContent::starter('Entwurf'));
        $this->menus->save('header', 'Hauptnavigation', [
            ['label' => 'Verschwindet', 'type' => 'page', 'pageId' => $doomed, 'anchor' => '', 'children' => [
                ['label' => 'Bleibt als Kind', 'type' => 'url', 'url' => 'https://example.com', 'children' => []],
            ]],
            ['label' => 'Noch Entwurf', 'type' => 'page', 'pageId' => $draft, 'anchor' => '', 'children' => []],
            ['label' => 'Extern', 'type' => 'url', 'url' => 'https://hausklar.app', 'children' => []],
        ], 0);
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $this->pages->deletePage($doomed, $this->pages->findForEditor($doomed)['version']);

        $html = $this->request('/')->getContent();
        self::assertStringNotContainsString('Verschwindet', $html);
        // An unpublished page must not appear in public navigation.
        self::assertStringNotContainsString('Noch Entwurf', $html);
        self::assertStringNotContainsString('/entwurf', $html);
        // The rest of the menu is intact, including the child of the removed branch.
        self::assertStringContainsString('Bleibt als Kind', $html);
        self::assertStringContainsString('href="https://hausklar.app"', $html);
        // The stored items are untouched: publishing the draft brings its entry back.
        self::assertCount(3, $this->menus->all()['header']['items']);
        $page = $this->pages->findForEditor($draft);
        $this->pages->publish($draft, $page['draft_revision_id'], $page['version']);
        self::assertStringContainsString('Noch Entwurf', $this->request('/')->getContent());
    }

    /**
     * @return iterable<string, array{array}>
     */
    public static function rejectedMenuItems(): iterable
    {
        $page = static fn (array $extra = []): array => [...['label' => 'Eintrag', 'type' => 'page', 'pageId' => 'page-1', 'anchor' => '', 'children' => []], ...$extra];
        yield 'empty label' => [[$page(['label' => '  '])]];
        yield 'oversized label' => [[$page(['label' => str_repeat('a', 81)])]];
        yield 'unknown type' => [[$page(['type' => 'script'])]];
        yield 'missing page' => [[$page(['pageId' => ''])]];
        yield 'anchor with hash' => [[$page(['anchor' => 'a#b'])]];
        yield 'anchor starting with digit' => [[$page(['anchor' => '1kontakt'])]];
        yield 'javascript url' => [[['label' => 'X', 'type' => 'url', 'url' => 'javascript:alert(1)', 'children' => []]]];
        yield 'plain http url' => [[['label' => 'X', 'type' => 'url', 'url' => 'http://example.com', 'children' => []]]];
        yield 'protocol relative url' => [[['label' => 'X', 'type' => 'url', 'url' => '//evil.example', 'children' => []]]];
        yield 'third level' => [[$page(['children' => [$page(['children' => [$page()]])]])]];
    }

    #[DataProvider('rejectedMenuItems')]
    public function testRejectsInvalidMenuItemsWithoutWriting(array $items): void
    {
        try {
            $this->menus->save('header', 'Hauptnavigation', $items, 0);
            self::fail('Expected the menu to be rejected.');
        } catch (InvalidMenu) {
        }
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM menu'));
    }

    public function testMenuRejectsUnknownSlotOversizeAndStaleWrites(): void
    {
        $item = ['label' => 'Start', 'type' => 'page', 'pageId' => 'page-1', 'anchor' => '', 'children' => []];
        try {
            $this->menus->save('sidebar', 'Seitenleiste', [$item], 0);
            self::fail('Expected an unknown slot to be rejected.');
        } catch (InvalidMenu) {
        }
        try {
            $this->menus->save('header', 'Hauptnavigation', array_fill(0, MenuRepository::MAX_ITEMS + 1, $item), 0);
            self::fail('Expected the item limit to apply.');
        } catch (InvalidMenu) {
        }
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM menu'));

        $this->menus->save('header', 'Hauptnavigation', [$item], 0);
        self::assertSame(1, $this->menus->all()['header']['version']);
        $this->expectException(StaleWrite::class);
        $this->menus->save('header', 'Geaendert', [$item], 0);
    }

    private function publishedPage(string $slug, string $title): string
    {
        $id = $this->pages->createPage($slug, null, 'page', DemoContent::starter($title));
        $page = $this->pages->findForEditor($id);
        $this->pages->publish($id, $page['draft_revision_id'], $page['version']);

        return $id;
    }

    public function testArchiveOrdersPostsByDatePaginatesAndHidesPagesAndDrafts(): void
    {
        // Three published posts with distinct dates, one draft post and one ordinary page.
        foreach ([['alt', '2024-01-05'], ['mittel', '2025-06-01'], ['neu', '2026-03-09']] as [$slug, $date]) {
            $id = $this->publishedPost($slug, ucfirst($slug), $date);
            self::assertNotNull($this->pages->findForEditor($id));
        }
        $this->pages->createPage('unveroeffentlicht', null, 'post', DemoContent::starter('Unveroeffentlicht', 'post'));
        $this->publishedPage('eine-seite', 'Eine Seite');

        $first = $this->posts->published(1, null, 2);
        self::assertSame(3, $first['total']);
        self::assertSame(2, $first['pages']);
        self::assertSame(['Neu', 'Mittel'], array_column($first['posts'], 'title'));
        self::assertSame(['Alt'], array_column($this->posts->published(2, null, 2)['posts'], 'title'));
        // A page is not a post, and an unpublished post stays out of the archive.
        foreach ($this->posts->published(1, null, 20)['posts'] as $post) {
            self::assertNotSame('Eine Seite', $post['title']);
            self::assertNotSame('Unveroeffentlicht', $post['title']);
        }
        // Out-of-range page numbers clamp instead of showing an empty archive.
        self::assertSame(2, $this->posts->published(99, null, 2)['page']);
        self::assertSame(1, $this->posts->published(-5, null, 2)['page']);

        $html = $this->request('/beitraege')->getContent();
        self::assertSame(200, $this->request('/beitraege')->getStatusCode());
        self::assertStringContainsString('<time datetime="2026-03-09">09.03.2026</time>', $html);
        self::assertStringNotContainsString('Unveroeffentlicht', $html);
        self::assertStringContainsString('href="https://cms.test/beitraege"', $html);
    }

    public function testCategoriesAndTagsGroupPostsAndGetTheirOwnArchives(): void
    {
        $projekt = $this->publishedPost('kanttresor', 'KantTresor', '2026-02-01', ['Projekte'], ['WordPress', 'DSGVO']);
        $this->publishedPost('andere', 'Andere', '2026-01-01', ['Notizen'], []);

        $terms = $this->posts->termsFor($projekt);
        self::assertSame(['Projekte'], array_column($terms['category'], 'name'));
        self::assertSame(['DSGVO', 'WordPress'], array_column($terms['tag'], 'name'));
        self::assertSame('/kategorie/projekte', $terms['category'][0]['href']);
        self::assertSame('/schlagwort/dsgvo', $terms['tag'][0]['href']);

        $category = $this->request('/kategorie/projekte');
        self::assertSame(200, $category->getStatusCode());
        self::assertStringContainsString('KantTresor', $category->getContent());
        self::assertStringNotContainsString('Andere', $category->getContent());

        self::assertStringContainsString('KantTresor', $this->request('/schlagwort/wordpress')->getContent());
        self::assertSame(404, $this->request('/kategorie/gibt-es-nicht')->getStatusCode());
        // A tag slug is not a category slug.
        self::assertSame(404, $this->request('/kategorie/dsgvo')->getStatusCode());

        // Saving metadata again replaces the assignment instead of adding to it.
        $version = $this->pages->findForEditor($projekt)['version'];
        $this->posts->saveMetadata($projekt, ['publishedAt' => '2026-02-01'], ['Projekte'], [], $version);
        self::assertSame([], $this->posts->termsFor($projekt)['tag']);
        // The term itself survives as a reusable label, so its archive answers but lists nothing.
        $emptied = $this->request('/schlagwort/wordpress');
        self::assertSame(200, $emptied->getStatusCode());
        self::assertStringNotContainsString('KantTresor', $emptied->getContent());
    }

    public function testPostListBlockIsFilledByTheRendererAndRespectsItsFilter(): void
    {
        $this->publishedPost('projekt-eins', 'Projekt eins', '2026-02-01', ['Projekte'], []);
        $this->publishedPost('notiz', 'Eine Notiz', '2026-02-02', ['Notizen'], []);

        $document = DemoContent::starter('Startseite');
        $document['schemaVersion'] = 5;
        $document['blocks'][] = ['id' => 'liste', 'type' => 'postlist', 'props' => ['count' => 5, 'category' => 'projekte', 'tag' => ''], 'children' => []];
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);

        $html = $this->request('/')->getContent();
        self::assertStringContainsString('Projekt eins', $html);
        self::assertStringNotContainsString('Eine Notiz', $html);
        // The stored block carries no post data; only the filter and the count are content.
        $stored = $this->pages->findPublished('home')['document'];
        self::assertSame(['count' => 5, 'category' => 'projekte', 'tag' => ''], $stored['blocks'][2]['props']);
    }

    public function testFeedListsPublishedPostsWithAbsoluteAddresses(): void
    {
        $this->publishedPost('erster', 'Erster Beitrag', '2026-02-01', ['Projekte'], []);
        $this->pages->createPage('geheim', null, 'post', DemoContent::starter('Geheim', 'post'));

        $response = $this->request('/feed.xml');
        self::assertSame(200, $response->getStatusCode());
        self::assertStringContainsString('application/xml', (string) $response->headers->get('Content-Type'));
        $xml = $response->getContent();
        self::assertStringContainsString('<link>https://cms.test/erster</link>', $xml);
        self::assertStringContainsString('<category>Projekte</category>', $xml);
        self::assertStringNotContainsString('Geheim', $xml);
        self::assertNotFalse(simplexml_load_string($xml), 'The feed must be well-formed XML.');
    }

    /**
     * @return iterable<string, array{array, array, array}>
     */
    public static function rejectedPostMetadata(): iterable
    {
        yield 'oversized excerpt' => [['excerpt' => str_repeat('a', 501)], [], []];
        yield 'oversized author' => [['author' => str_repeat('a', 121)], [], []];
        yield 'malformed date' => [['publishedAt' => '09.03.2026'], [], []];
        yield 'unknown media' => [['featuredMediaId' => str_repeat('a', 32)], [], []];
        yield 'malformed media id' => [['featuredMediaId' => 'not-a-media-id'], [], []];
        yield 'unusable term name' => [[], ['---'], []];
    }

    #[DataProvider('rejectedPostMetadata')]
    public function testRejectsInvalidPostMetadataWithoutWriting(array $values, array $categories, array $tags): void
    {
        $id = $this->pages->createPage('beitrag', null, 'post', DemoContent::starter('Beitrag', 'post'));
        $version = $this->pages->findForEditor($id)['version'];
        try {
            $this->posts->saveMetadata($id, $values, $categories, $tags, $version);
            self::fail('Expected the metadata to be rejected.');
        } catch (InvalidPage) {
        }
        self::assertSame($version, $this->pages->findForEditor($id)['version']);
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page_term'));
    }

    public function testDeletingAPostReleasesItsTermAssignments(): void
    {
        $id = $this->publishedPost('weg', 'Weg', '2026-01-01', ['Projekte'], ['Tag']);
        self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page_term'));
        $this->pages->deletePage($id, $this->pages->findForEditor($id)['version']);
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM page_term'));
        // The terms themselves stay: they are reusable labels, not content of one post.
        self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM term'));
        $archive = $this->request('/kategorie/projekte');
        self::assertSame(200, $archive->getStatusCode());
        self::assertStringNotContainsString('Weg', $archive->getContent());
        self::assertSame(0, $this->posts->published(1, $this->posts->findTerm('category', 'projekte')['id'])['total']);
    }

    public function testPublishingStampsAMissingDateButKeepsAGivenOne(): void
    {
        $given = $this->publishedPost('mit-datum', 'Mit Datum', '2024-07-04');
        self::assertStringStartsWith('2024-07-04', (string) $this->db->fetchOne('SELECT published_at FROM page WHERE id = ?', [$given]));

        $without = $this->pages->createPage('ohne-datum', null, 'post', DemoContent::starter('Ohne Datum', 'post'));
        $page = $this->pages->findForEditor($without);
        $this->pages->publish($without, $page['draft_revision_id'], $page['version']);
        self::assertNotNull($this->db->fetchOne('SELECT published_at FROM page WHERE id = ?', [$without]));

        // An ordinary page is never stamped.
        $plain = $this->publishedPage('normale-seite', 'Normale Seite');
        self::assertNull($this->db->fetchOne('SELECT published_at FROM page WHERE id = ?', [$plain]));
    }

    private function publishedPost(string $slug, string $title, string $date, array $categories = [], array $tags = []): string
    {
        $id = $this->pages->createPage($slug, null, 'post', DemoContent::starter($title, 'post'));
        $this->posts->saveMetadata($id, ['publishedAt' => $date, 'author' => 'Umut'], $categories, $tags, $this->pages->findForEditor($id)['version']);
        $page = $this->pages->findForEditor($id);
        $this->pages->publish($id, $page['draft_revision_id'], $page['version']);

        return $id;
    }

    /** A page built from the section kinds the pilot start page actually uses. */
    private static function pilotDocument(): array
    {
        return [
            'schemaVersion' => 6,
            'title' => 'Kant-IT',
            'description' => 'Ihr IT-Partner.',
            'blocks' => [
                ['id' => 'hero', 'type' => 'section', 'children' => [
                    ['id' => 'h1', 'type' => 'heading', 'props' => ['text' => 'Digitale Exzellenz', 'level' => 1]],
                    ['id' => 'stat1', 'type' => 'stat', 'props' => ['value' => '15+', 'label' => 'Jahre Erfahrung']],
                    ['id' => 'sp', 'type' => 'spacer', 'props' => ['size' => 'large']],
                    ['id' => 'hr', 'type' => 'divider'],
                ]],
                ['id' => 'leistungen', 'type' => 'section', 'children' => [
                    ['id' => 'card1', 'type' => 'iconcard', 'props' => ['icon' => 'app', 'title' => 'App-Entwicklung', 'text' => 'Für iOS und Android.', 'href' => '/leistungen']],
                    ['id' => 'card2', 'type' => 'iconcard', 'props' => ['icon' => 'shop', 'title' => 'E-Commerce', 'text' => '', 'href' => '']],
                ]],
                ['id' => 'stimmen', 'type' => 'section', 'children' => [
                    ['id' => 'q1', 'type' => 'quote', 'props' => ['text' => 'Kant-IT denkt mit.', 'author' => 'Malerservice Drews', 'role' => 'Zufriedener Kunde', 'rating' => 5]],
                    ['id' => 'logos', 'type' => 'logos', 'children' => [
                        ['id' => 'logo1', 'type' => 'image', 'props' => ['src' => '/assets/image-placeholder.svg', 'alt' => 'Partner', 'decorative' => false, 'width' => 200, 'height' => 80]],
                    ]],
                ]],
                ['id' => 'fragen', 'type' => 'accordion', 'children' => [
                    ['id' => 'f1', 'type' => 'accordionitem', 'props' => ['title' => 'Wie schnell antwortet ihr?', 'open' => true], 'children' => [
                        ['id' => 'f1t', 'type' => 'text', 'props' => ['text' => 'In der Regel innerhalb von 24 Stunden.']],
                    ]],
                ]],
                ['id' => 'kontakt', 'type' => 'section', 'children' => [
                    ['id' => 'cta1', 'type' => 'cta', 'props' => ['title' => 'Bereit?', 'text' => 'Kostenlose Erstberatung.', 'buttonText' => 'Jetzt anfragen', 'href' => '#kontakt']],
                    ['id' => 'adr', 'type' => 'contact', 'props' => ['phone' => '+49 7221 99 57 150', 'email' => 'info@kant-it.de', 'address' => 'Ooser Hauptstr. 51, Baden-Baden']],
                ]],
            ],
        ];
    }

    public function testPilotSectionsRoundTripAndRenderWithoutJavaScript(): void
    {
        $document = self::pilotDocument();
        $revision = $this->pages->saveDraft('page-1', $document, 0);
        self::assertSame($document, json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$revision]), true));
        $this->pages->publish('page-1', $revision, 1);

        $html = $this->request('/')->getContent();
        self::assertSame(200, $this->request('/')->getStatusCode());
        // Every new block reaches the output.
        foreach (['block-iconcard', 'block-stat', 'block-quote', 'block-logos', 'block-cta', 'block-contact', 'block-divider', 'block-spacer', 'block-accordionitem'] as $marker) {
            self::assertStringContainsString($marker, $html, $marker);
        }
        // Contact details become real links, with the phone number stripped for the href.
        self::assertStringContainsString('href="tel:+4972219957150"', $html);
        self::assertStringContainsString('href="mailto:info@kant-it.de"', $html);
        // The accordion is a native details element, so it works without scripting.
        self::assertStringContainsString('<details id="f1" class="block-accordionitem" open>', $html);
        self::assertStringContainsString('<summary>Wie schnell antwortet ihr?</summary>', $html);
        // Icons are inline SVG, not an icon font or an external request.
        self::assertStringContainsString('<svg class="block-icon"', $html);
        self::assertStringNotContainsString('<script', $html);
        // The rating is announced for screen readers rather than left as decorative stars.
        self::assertStringContainsString('Bewertung: 5 von 5', $html);
    }

    /**
     * @return iterable<string, array{array}>
     */
    public static function rejectedV6Blocks(): iterable
    {
        $wrap = static function (array $block): array {
            $document = DemoContent::starter('Titel');
            $document['schemaVersion'] = 6;
            $document['blocks'][] = $block;

            return [$document];
        };
        yield 'unknown icon' => $wrap(['id' => 'x', 'type' => 'iconcard', 'props' => ['icon' => 'rocket', 'title' => 'T', 'text' => '']]);
        yield 'iconcard without title' => $wrap(['id' => 'x', 'type' => 'iconcard', 'props' => ['icon' => 'app', 'title' => '  ', 'text' => '']]);
        yield 'iconcard with unsafe link' => $wrap(['id' => 'x', 'type' => 'iconcard', 'props' => ['icon' => 'app', 'title' => 'T', 'text' => '', 'href' => 'javascript:alert(1)']]);
        yield 'rating out of range' => $wrap(['id' => 'x', 'type' => 'quote', 'props' => ['text' => 'T', 'author' => 'A', 'role' => '', 'rating' => 6]]);
        yield 'rating not a number' => $wrap(['id' => 'x', 'type' => 'quote', 'props' => ['text' => 'T', 'author' => 'A', 'role' => '', 'rating' => '5']]);
        yield 'empty contact block' => $wrap(['id' => 'x', 'type' => 'contact', 'props' => ['phone' => '', 'email' => '', 'address' => '']]);
        yield 'invalid phone' => $wrap(['id' => 'x', 'type' => 'contact', 'props' => ['phone' => 'ruf mich an', 'email' => '', 'address' => '']]);
        yield 'invalid email' => $wrap(['id' => 'x', 'type' => 'contact', 'props' => ['phone' => '', 'email' => 'keine-adresse', 'address' => '']]);
        yield 'unknown spacer size' => $wrap(['id' => 'x', 'type' => 'spacer', 'props' => ['size' => 'gigantic']]);
        yield 'cta without target' => $wrap(['id' => 'x', 'type' => 'cta', 'props' => ['title' => 'T', 'text' => '', 'buttonText' => 'Los', 'href' => 'ftp://example.com']]);
        yield 'logos with a text child' => $wrap(['id' => 'x', 'type' => 'logos', 'children' => [['id' => 'y', 'type' => 'text', 'props' => ['text' => 'kein Logo']]]]);
        yield 'accordion with a text child' => $wrap(['id' => 'x', 'type' => 'accordion', 'children' => [['id' => 'y', 'type' => 'text', 'props' => ['text' => 'direkt']]]]);
        yield 'accordion entry outside an accordion' => $wrap(['id' => 'x', 'type' => 'accordionitem', 'props' => ['title' => 'T', 'open' => false], 'children' => []]);
        yield 'divider with children' => $wrap(['id' => 'x', 'type' => 'divider', 'children' => [['id' => 'y', 'type' => 'text', 'props' => ['text' => 'a']]]]);
    }

    #[DataProvider('rejectedV6Blocks')]
    public function testRejectsInvalidV6BlocksBeforeWriting(array $document): void
    {
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testV6BlocksNeedSchemaSixAndStayRejectedInOlderDocuments(): void
    {
        $document = DemoContent::starter('Titel');
        $document['schemaVersion'] = 5;
        $document['blocks'][] = ['id' => 'karte', 'type' => 'iconcard', 'props' => ['icon' => 'app', 'title' => 'T', 'text' => '']];
        try {
            $this->pages->saveDraft('page-1', $document, 0);
            self::fail('Expected schema v5 to reject a v6 block.');
        } catch (InvalidDocument) {
        }
        $document['schemaVersion'] = 6;
        self::assertNotEmpty($this->pages->saveDraft('page-1', $document, 0));
    }

    private static function tabsDocument(): array
    {
        $document = DemoContent::starter('Mit Tabs');
        $document['schemaVersion'] = 7;
        $document['blocks'][] = ['id' => 'tabs', 'type' => 'tabs', 'children' => [
            ['id' => 'tab-web', 'type' => 'tabitem', 'props' => ['title' => 'Web Design'], 'children' => [
                ['id' => 'tab-web-text', 'type' => 'text', 'props' => ['text' => 'Inhalt des ersten Tabs.']],
            ]],
            ['id' => 'tab-app', 'type' => 'tabitem', 'props' => ['title' => 'App-Entwicklung'], 'children' => [
                ['id' => 'tab-app-text', 'type' => 'text', 'props' => ['text' => 'Inhalt des zweiten Tabs.']],
            ]],
        ]];

        return $document;
    }

    public function testTabsRenderCompletelyWithoutScriptingAndLoadTheEnhancementOnlyWhereNeeded(): void
    {
        $document = self::tabsDocument();
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);

        $response = $this->request('/');
        $html = $response->getContent();
        // Without the script the page still carries both panels, their headings and their content.
        self::assertStringContainsString('Inhalt des ersten Tabs.', $html);
        self::assertStringContainsString('Inhalt des zweiten Tabs.', $html);
        self::assertStringContainsString('<h3 class="tabs-heading">Web Design</h3>', $html);
        self::assertStringContainsString('<a href="#tab-app">App-Entwicklung</a>', $html);
        // Neither panel is hidden server side; hiding is the script's job alone.
        self::assertStringContainsString('<section id="tab-web" class="block-tabitem">', $html);
        self::assertStringContainsString('<section id="tab-app" class="block-tabitem">', $html);
        // The enhancement is an external file; inline script never appears.
        self::assertStringContainsString('<script src="/assets/tabs.js" defer></script>', $html);
        // Scripting is permitted for this page only, and only from this origin.
        self::assertStringContainsString("script-src 'self'", (string) $response->headers->get('Content-Security-Policy'));

        // A page without tabs keeps the strict policy and loads no script at all.
        $plain = $this->publishedPage('ohne-tabs', 'Ohne Tabs');
        self::assertNotNull($this->pages->findForEditor($plain));
        $other = $this->request('/ohne-tabs');
        self::assertStringNotContainsString('tabs.js', $other->getContent());
        self::assertStringContainsString("script-src 'none'", (string) $other->headers->get('Content-Security-Policy'));
        self::assertSame(404, $this->request('/gibt-es-nicht')->getStatusCode());
        self::assertStringContainsString("script-src 'none'", (string) $this->request('/gibt-es-nicht')->headers->get('Content-Security-Policy'));
    }

    public function testTabsSurviveSavingAndRejectMisplacedEntries(): void
    {
        $document = self::tabsDocument();
        $revision = $this->pages->saveDraft('page-1', $document, 0);
        self::assertSame($document, json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$revision]), true));

        // A tab outside a tab group, and a tab group holding anything else, are both refused.
        $loose = DemoContent::starter('Titel');
        $loose['schemaVersion'] = 7;
        $loose['blocks'][] = ['id' => 'x', 'type' => 'tabitem', 'props' => ['title' => 'Allein'], 'children' => []];
        try {
            $this->pages->saveDraft('page-1', $loose, 1);
            self::fail('Expected a tab outside a tab group to be rejected.');
        } catch (InvalidDocument) {
        }
        $wrong = DemoContent::starter('Titel');
        $wrong['schemaVersion'] = 7;
        $wrong['blocks'][] = ['id' => 'x', 'type' => 'tabs', 'children' => [['id' => 'y', 'type' => 'text', 'props' => ['text' => 'direkt']]]];
        try {
            $this->pages->saveDraft('page-1', $wrong, 1);
            self::fail('Expected a tab group with a text child to be rejected.');
        } catch (InvalidDocument) {
        }
        // And tabs need schema v7.
        $old = self::tabsDocument();
        $old['schemaVersion'] = 6;
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $old, 1);
    }

    public function testSitemapListsOnlyPublishedIndexablePagesAndPointsRobotsAtIt(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $hidden = $this->publishedPage('intern', 'Intern');
        $this->posts->saveMetadata($hidden, ['robots' => 'noindex'], [], [], $this->pages->findForEditor($hidden)['version']);
        $this->publishedPage('offen', 'Offen');
        $this->pages->createPage('entwurf', null, 'page', DemoContent::starter('Entwurf'));
        $this->publishedPost('ein-beitrag', 'Ein Beitrag', '2026-02-01', ['Projekte'], []);

        $sitemap = $this->request('/sitemap.xml');
        self::assertSame(200, $sitemap->getStatusCode());
        self::assertStringContainsString('application/xml', (string) $sitemap->headers->get('Content-Type'));
        $xml = $sitemap->getContent();
        self::assertNotFalse(simplexml_load_string($xml), 'The sitemap must be well-formed XML.');
        self::assertStringContainsString('<loc>https://cms.test/</loc>', $xml);
        self::assertStringContainsString('<loc>https://cms.test/offen</loc>', $xml);
        self::assertStringContainsString('<loc>https://cms.test/beitraege</loc>', $xml);
        self::assertStringContainsString('<loc>https://cms.test/kategorie/projekte</loc>', $xml);
        // A noindex page and an unpublished page have no business in a sitemap.
        self::assertStringNotContainsString('/intern', $xml);
        self::assertStringNotContainsString('/entwurf', $xml);

        $robots = $this->request('/robots.txt');
        self::assertSame(200, $robots->getStatusCode());
        self::assertStringContainsString('text/plain', (string) $robots->headers->get('Content-Type'));
        self::assertStringContainsString('Disallow: /admin', $robots->getContent());
        self::assertStringContainsString('Sitemap: https://cms.test/sitemap.xml', $robots->getContent());

        // A page excluded from indexing says so on the page itself as well.
        self::assertStringContainsString('<meta name="robots" content="noindex, follow">', $this->request('/intern')->getContent());
        self::assertStringNotContainsString('name="robots"', $this->request('/offen')->getContent());
    }

    public function testRedirectsAnswerBeforeTheNotFoundAndRefuseChainsAndLoops(): void
    {
        $this->publishedPage('leistungen', 'Leistungen');
        $this->redirects->save('alte-seite', 'leistungen', 301);
        $this->redirects->save('weg', '', 410);

        $moved = $this->request('/alte-seite');
        self::assertSame(301, $moved->getStatusCode());
        self::assertSame('/leistungen', $moved->headers->get('Location'));
        // A deliberately removed address is gone, not merely missing.
        self::assertSame(410, $this->request('/weg')->getStatusCode());
        self::assertSame(404, $this->request('/nie-dagewesen')->getStatusCode());

        foreach ([['alte-seite', 'alte-seite', 301], ['noch-eine', 'alte-seite', 301], ['Gross', 'leistungen', 301], ['ok', 'leistungen', 302]] as [$from, $to, $status]) {
            try {
                $this->redirects->save($from, $to, $status);
                self::fail(sprintf('Expected /%s -> /%s (%d) to be rejected.', $from, $to, $status));
            } catch (InvalidPage) {
            }
        }
        self::assertSame(2, (int) $this->db->fetchOne('SELECT COUNT(*) FROM redirect'));

        // An existing page always wins over a redirect with the same address.
        $this->redirects->save('leistungen', 'offen', 301);
        self::assertSame(200, $this->request('/leistungen')->getStatusCode());
    }

    public function testStructuredDataComesOnlyFromMaintainedValues(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        // Nothing maintained yet: no empty organisation block is emitted.
        self::assertStringNotContainsString('application/ld+json', $this->request('/')->getContent());

        $this->site->save([
            'legalName' => 'Kant-IT Solutions', 'phone' => '+49 7221 9957150', 'email' => 'info@kant-it.de',
            'street' => 'Ooser Hauptstr. 51', 'postalCode' => '76532', 'city' => 'Baden-Baden', 'country' => 'de',
            'sameAs' => "https://hausklar.app\nhttps://hausklar.app", 'localBusiness' => '1',
        ]);
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('<script type="application/ld+json">', $html);
        preg_match('#<script type="application/ld\+json">(.*?)</script>#s', $html, $match);
        $data = json_decode(html_entity_decode($match[1], ENT_QUOTES), true);
        self::assertSame('LocalBusiness', $data['@type']);
        self::assertSame('Kant-IT Solutions', $data['name']);
        self::assertSame('Baden-Baden', $data['address']['addressLocality']);
        self::assertSame('DE', $data['address']['addressCountry']);
        // Duplicates are collapsed, and nothing is invented.
        self::assertSame(['https://hausklar.app'], $data['sameAs']);
        self::assertArrayNotHasKey('description', $data);

        // A post carries Article data built from its own metadata.
        $post = $this->publishedPost('ein-beitrag', 'Ein Beitrag', '2026-02-01');
        self::assertNotNull($this->pages->findForEditor($post));
        $article = $this->request('/ein-beitrag')->getContent();
        self::assertStringContainsString('"@type":"Article"', $article);
        self::assertStringContainsString('"headline":"Ein Beitrag"', $article);
        self::assertStringContainsString('"name":"Umut"', $article);
    }

    public function testBreadcrumbTrailAndItsStructuredDataFollowTheStoredHierarchy(): void
    {
        $parent = $this->publishedPage('leistungen', 'Leistungen');
        self::assertNotNull($this->pages->findForEditor($parent));
        $childId = $this->pages->createPage('webdesign', $parent, 'page', (static function (): array {
            $document = DemoContent::starter('Webdesign');
            $document['schemaVersion'] = 9;
            $document['blocks'][] = ['id' => 'krumen', 'type' => 'breadcrumb'];

            return $document;
        })());
        $child = $this->pages->findForEditor($childId);
        $this->pages->publish($childId, $child['draft_revision_id'], $child['version']);

        $html = $this->request('/leistungen/webdesign')->getContent();
        self::assertStringContainsString('aria-label="Brotkrumen"', $html);
        self::assertStringContainsString('<a href="/leistungen">Leistungen</a>', $html);
        self::assertStringContainsString('<span aria-current="page">Webdesign</span>', $html);
        self::assertStringContainsString('"@type":"BreadcrumbList"', $html);
        self::assertStringContainsString('"item":"https://cms.test/leistungen"', $html);

        // A page directly under the root gets no trail, so no empty navigation appears.
        self::assertStringNotContainsString('aria-label="Brotkrumen"', $this->request('/leistungen')->getContent());
    }

    public function testLlmsTxtIsOffByDefaultAndListsOnlyPublicIndexableContent(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        self::assertSame(404, $this->request('/llms.txt')->getStatusCode());

        $hidden = $this->publishedPage('intern', 'Intern');
        $this->posts->saveMetadata($hidden, ['robots' => 'noindex'], [], [], $this->pages->findForEditor($hidden)['version']);
        $this->pages->createPage('entwurf', null, 'page', DemoContent::starter('Entwurf'));
        $this->site->save(['llmsTxt' => '1', 'legalName' => 'Kant-IT', 'description' => 'Ihr IT-Partner.', 'country' => 'DE']);

        $response = $this->request('/llms.txt');
        self::assertSame(200, $response->getStatusCode());
        $body = $response->getContent();
        self::assertStringContainsString('# Kant-IT', $body);
        self::assertStringContainsString('> Ihr IT-Partner.', $body);
        self::assertStringContainsString('https://cms.test/', $body);
        self::assertStringNotContainsString('Intern', $body);
        self::assertStringNotContainsString('Entwurf', $body);
    }

    /**
     * @return iterable<string, array{array}>
     */
    public static function rejectedSettings(): iterable
    {
        yield 'invalid email' => [['email' => 'keine-adresse', 'country' => 'DE']];
        yield 'invalid phone' => [['phone' => 'ruf an', 'country' => 'DE']];
        yield 'invalid country' => [['country' => 'Deutschland']];
        yield 'insecure profile' => [['country' => 'DE', 'sameAs' => 'http://example.com']];
        yield 'local business without address' => [['country' => 'DE', 'localBusiness' => '1']];
    }

    #[DataProvider('rejectedSettings')]
    public function testRejectsInvalidCompanyDataWithoutWriting(array $input): void
    {
        try {
            $this->site->save($input);
            self::fail('Expected the settings to be rejected.');
        } catch (InvalidPage) {
        }
        self::assertNull($this->db->fetchOne('SELECT settings FROM website WHERE id = ?', ['default']));
    }

    public function testRobotsExtraOnlyAcceptsPlainDirectiveLines(): void
    {
        $this->site->save([
            'country' => 'DE',
            'robotsExtra' => "Disallow: /geheim\n# ein Kommentar\n<script>alert(1)</script>\nSitemap: https://fremde.example/sitemap.xml",
        ]);
        $body = $this->request('/robots.txt')->getContent();
        self::assertStringContainsString('Disallow: /geheim', $body);
        self::assertStringContainsString('# ein Kommentar', $body);
        // Neither markup nor a second sitemap declaration survives the filter.
        self::assertStringNotContainsString('<script>', $body);
        self::assertStringNotContainsString('fremde.example', $body);
        self::assertSame(1, substr_count($body, 'Sitemap:'));
    }

    private static function styledDocument(): array
    {
        $document = DemoContent::starter('Gestaltet');
        $document['schemaVersion'] = 10;
        $document['blocks'][0]['style'] = [
            'desktop' => [
                'backgroundColor' => '@mint',
                'color' => '#123456',
                'padding' => ['top' => '80px', 'bottom' => '80px'],
                'borderRadius' => ['topLeft' => '24px'],
                'fontSize' => '42px',
                'letterSpacing' => '-1.5px',
                'shadowY' => '12px', 'shadowBlur' => '40px', 'shadowColor' => '#00000022',
                'hover' => ['backgroundColor' => '#ffffff', 'scale' => 1.02],
            ],
            'mobile' => ['fontSize' => '28px', 'padding' => ['top' => '32px']],
        ];

        return $document;
    }

    public function testFreeStylesSurviveSavingAndBecomeScopedCss(): void
    {
        $document = self::styledDocument();
        $revision = $this->pages->saveDraft('page-1', $document, 0);
        self::assertSame($document, json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$revision]), true));
        $this->pages->publish('page-1', $revision, 1);

        $html = $this->request('/')->getContent();
        // Values become declarations scoped to the block, palette colours become variables.
        self::assertStringContainsString('#start-hero{', $html);
        self::assertStringContainsString('background-color:var(--k-mint)', $html);
        self::assertStringContainsString('color:#123456', $html);
        self::assertStringContainsString('padding-top:80px', $html);
        self::assertStringContainsString('border-top-left-radius:24px', $html);
        self::assertStringContainsString('letter-spacing:-1.5px', $html);
        self::assertStringContainsString('box-shadow:0 12px 40px 0 #00000022', $html);
        // Hover and the narrow breakpoint get their own rules.
        self::assertStringContainsString('#start-hero:hover,#start-hero:focus-within{', $html);
        self::assertStringContainsString('transform:scale(1.02)', $html);
        self::assertStringContainsString('@media (max-width:767px){#start-hero{font-size:28px', $html);
    }

    public function testInlineStylesheetIsAllowedByItsOwnHashAndNothingElse(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', self::styledDocument(), 0), 1);
        $response = $this->request('/');
        $policy = (string) $response->headers->get('Content-Security-Policy');

        preg_match('#<style>(.*?)</style>#s', $response->getContent(), $match);
        self::assertNotEmpty($match[1] ?? '', 'The page carries a generated stylesheet.');
        $expected = base64_encode(hash('sha256', html_entity_decode($match[1], ENT_QUOTES), true));
        self::assertStringContainsString(sprintf("'sha256-%s'", $expected), $policy);
        // Never a blanket permission for inline styles, and scripting stays off.
        self::assertStringNotContainsString('unsafe-inline', $policy);
        self::assertStringContainsString("script-src 'none'", $policy);
    }

    /**
     * @return iterable<string, array{array}>
     */
    public static function rejectedStyles(): iterable
    {
        $wrap = static function (array $style): array {
            $document = DemoContent::starter('Titel');
            $document['schemaVersion'] = 10;
            $document['blocks'][0]['style'] = $style;

            return [$document];
        };
        yield 'unknown property' => $wrap(['desktop' => ['zIndexHack' => '9999']]);
        yield 'unknown device' => $wrap(['watch' => ['fontSize' => '12px']]);
        yield 'colour that is a word' => $wrap(['desktop' => ['color' => 'red']]);
        yield 'colour with a function' => $wrap(['desktop' => ['color' => 'rgb(1,2,3)']]);
        yield 'length without unit' => $wrap(['desktop' => ['fontSize' => '18']]);
        yield 'length with expression' => $wrap(['desktop' => ['fontSize' => 'calc(1px + 2px)']]);
        yield 'value with a declaration' => $wrap(['desktop' => ['fontSize' => '18px;position:fixed']]);
        yield 'choice outside the list' => $wrap(['desktop' => ['display' => 'contents']]);
        yield 'number out of range' => $wrap(['desktop' => ['opacity' => 4]]);
        yield 'side given as a single value' => $wrap(['desktop' => ['padding' => '10px']]);
        yield 'unknown side' => $wrap(['desktop' => ['padding' => ['middle' => '10px']]]);
        yield 'hover on a property without hover' => $wrap(['desktop' => ['hover' => ['fontSize' => '10px']]]);
        yield 'font key with quotes' => $wrap(['desktop' => ['fontFamily' => '"Inter",serif']]);
        yield 'background that is not a media id' => $wrap(['desktop' => ['backgroundImage' => '/etc/passwd']]);
    }

    #[DataProvider('rejectedStyles')]
    public function testRejectsInvalidStylesBeforeWriting(array $document): void
    {
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testFreeStylesNeedSchemaTen(): void
    {
        $document = self::styledDocument();
        $document['schemaVersion'] = 9;
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testThemeDrivesEveryPageAndGoogleFontsOpenTheirOwnPolicy(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        // Without a stored theme the defaults apply and no third party is contacted.
        $plain = $this->request('/');
        self::assertStringContainsString('--k-ink:#203b34', $plain->getContent());
        self::assertStringNotContainsString('fonts.googleapis.com', $plain->getContent());
        self::assertStringNotContainsString('fonts.gstatic.com', (string) $plain->headers->get('Content-Security-Policy'));

        $this->themes->save(
            [['key' => 'marke', 'name' => 'Marke', 'value' => '#Ff3300'], ['key' => 'ink', 'name' => 'Tinte', 'value' => '#111111']],
            [['key' => 'body', 'name' => 'Text', 'family' => 'Inter', 'source' => 'google', 'weights' => [400, 700], 'fallback' => 'sans-serif']],
            ['fontFamily' => 'body', 'headingFontFamily' => 'body', 'fontSize' => '20px', 'lineHeight' => 1.7, 'color' => '@ink', 'backgroundColor' => '#ffffff', 'linkColor' => '@marke', 'containerWidth' => '1100px', 'headingScale' => 1.3],
        );

        $response = $this->request('/');
        $html = $response->getContent();
        self::assertStringContainsString('--k-marke:#ff3300', $html, 'colour values are normalised');
        self::assertStringContainsString('--kf-body:"Inter",sans-serif', $html);
        self::assertStringContainsString('font-size:var(--k-size)', $html);
        self::assertStringContainsString('--k-container:1100px', $html);
        self::assertStringContainsString('fonts.googleapis.com/css2?family=Inter:wght@400;700', $html);
        $policy = (string) $response->headers->get('Content-Security-Policy');
        self::assertStringContainsString('https://fonts.googleapis.com', $policy);
        self::assertStringContainsString("font-src 'self' https://fonts.gstatic.com", $policy);
    }

    /**
     * @return iterable<string, array{array, array, array}>
     */
    public static function rejectedThemes(): iterable
    {
        $font = ['key' => 'body', 'name' => 'Text', 'family' => '', 'source' => 'system', 'weights' => [400], 'fallback' => 'system-ui'];
        $base = ['fontFamily' => 'body', 'headingFontFamily' => 'body', 'color' => '@ink', 'backgroundColor' => '#ffffff', 'linkColor' => '#000000', 'fontSize' => '18px', 'containerWidth' => '1240px', 'lineHeight' => 1.6, 'headingScale' => 1.25];
        yield 'colour that is not hex' => [[['key' => 'ink', 'name' => 'T', 'value' => 'darkgreen']], [$font], $base];
        yield 'duplicate colour key' => [[['key' => 'ink', 'name' => 'A', 'value' => '#000000'], ['key' => 'ink', 'name' => 'B', 'value' => '#111111']], [$font], $base];
        yield 'font family with a stack' => [[['key' => 'ink', 'name' => 'T', 'value' => '#000000']], [[...$font, 'family' => 'Inter,serif']], $base];
        yield 'google font without a name' => [[['key' => 'ink', 'name' => 'T', 'value' => '#000000']], [[...$font, 'source' => 'google']], $base];
        yield 'base colour without palette entry' => [[['key' => 'other', 'name' => 'T', 'value' => '#000000']], [$font], $base];
        yield 'base size without unit' => [[['key' => 'ink', 'name' => 'T', 'value' => '#000000']], [$font], [...$base, 'fontSize' => '18']];
        yield 'line height out of range' => [[['key' => 'ink', 'name' => 'T', 'value' => '#000000']], [$font], [...$base, 'lineHeight' => 9]];
        yield 'no colour at all' => [[], [$font], $base];
    }

    #[DataProvider('rejectedThemes')]
    public function testRejectsInvalidThemesWithoutWriting(array $colors, array $fonts, array $base): void
    {
        $before = $this->db->fetchOne('SELECT theme FROM website WHERE id = ?', ['default']);
        try {
            $this->themes->save($colors, $fonts, $base);
            self::fail('Expected the theme to be rejected.');
        } catch (InvalidPage) {
        }
        self::assertSame($before, $this->db->fetchOne('SELECT theme FROM website WHERE id = ?', ['default']));
        self::assertSame(Theme::DEFAULTS['colors'], $this->themes->load()['colors']);
    }

    public function testMovingAPageCarriesItsSubtreeAndLeavesRedirectsBehind(): void
    {
        $parent = $this->publishedPage('leistungen', 'Leistungen');
        $child = $this->publishedChild('webdesign', 'Webdesign', $parent);
        $grandchild = $this->publishedChild('shop', 'Shop', $child);
        foreach (['leistungen', 'leistungen/webdesign', 'leistungen/webdesign/shop'] as $path) {
            self::assertSame(200, $this->request('/'.$path)->getStatusCode(), $path);
        }

        $moved = $this->pages->movePage($parent, 'services', null, $this->pages->findForEditor($parent)['version'], $this->redirects);
        self::assertSame(3, $moved, 'The page and both descendants change address.');

        // Every new address answers and every old one redirects permanently.
        foreach ([
            'services' => 'leistungen',
            'services/webdesign' => 'leistungen/webdesign',
            'services/webdesign/shop' => 'leistungen/webdesign/shop',
        ] as $now => $before) {
            self::assertSame(200, $this->request('/'.$now)->getStatusCode(), $now);
            $old = $this->request('/'.$before);
            self::assertSame(301, $old->getStatusCode(), $before);
            self::assertSame('/'.$now, $old->headers->get('Location'), $before);
        }
        // The grandchild kept its own slug and its parent link.
        self::assertSame('shop', $this->db->fetchOne('SELECT slug FROM page WHERE id = ?', [$grandchild]));
        self::assertSame($child, $this->db->fetchOne('SELECT parent_id FROM page WHERE id = ?', [$grandchild]));
    }

    public function testMoveRefusesCyclesCollisionsAndTheHomePage(): void
    {
        $parent = $this->publishedPage('leistungen', 'Leistungen');
        $child = $this->publishedChild('webdesign', 'Webdesign', $parent);
        $other = $this->publishedPage('beratung', 'Beratung');

        $cases = [
            'into its own child' => [$parent, 'leistungen', $child],
            'into itself' => [$parent, 'leistungen', $parent],
            'onto a taken address' => [$other, 'leistungen', null],
            'with a slug that is no slug' => [$other, 'mit leerzeichen', null],
        ];
        foreach ($cases as $name => [$page, $slug, $target]) {
            try {
                $this->pages->movePage($page, $slug, $target, $this->pages->findForEditor($page)['version'], $this->redirects);
                self::fail(sprintf('Expected "%s" to be refused.', $name));
            } catch (InvalidPage) {
            }
        }
        // The home page keeps its address; a different start page is a settings matter.
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        try {
            $this->pages->movePage('page-1', 'start', null, $this->pages->findForEditor('page-1')['version'], $this->redirects);
            self::fail('Expected the home page to be refused.');
        } catch (InvalidPage) {
        }
        // Nothing moved and no redirect was invented.
        self::assertSame(['beratung', 'home', 'leistungen', 'leistungen/webdesign', 'private'], $this->db->fetchFirstColumn('SELECT path FROM page ORDER BY path'));
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM redirect'));
    }

    public function testTrashHidesAPageEverywhereAndRestoreBringsItBack(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $parent = $this->publishedPage('leistungen', 'Leistungen');
        $child = $this->publishedChild('webdesign', 'Webdesign', $parent);
        $post = $this->publishedPost('ein-beitrag', 'Ein Beitrag', '2026-02-01', ['Projekte'], []);
        $this->menus->save('header', 'Hauptnavigation', [
            ['label' => 'Leistungen', 'type' => 'page', 'pageId' => $parent, 'anchor' => '', 'children' => []],
        ], 0);
        self::assertStringContainsString('Leistungen', $this->request('/')->getContent());

        // Trashing takes the subtree along.
        self::assertSame(2, $this->pages->trashPage($parent, $this->pages->findForEditor($parent)['version']));
        self::assertSame(404, $this->request('/leistungen')->getStatusCode());
        self::assertSame(404, $this->request('/leistungen/webdesign')->getStatusCode());
        self::assertStringNotContainsString('Leistungen', $this->request('/')->getContent(), 'A trashed page leaves the navigation.');
        self::assertStringNotContainsString('/leistungen', $this->request('/sitemap.xml')->getContent());
        self::assertNull($this->pages->findForEditor($parent), 'A trashed page is out of the editor listing.');
        self::assertSame([$parent, $child], array_column($this->pages->trash(), 'id'));

        // A trashed post disappears from the archive and the feed as well.
        $this->pages->trashPage($post, $this->db->fetchOne('SELECT version FROM page WHERE id = ?', [$post]));
        self::assertSame(0, $this->posts->published()['total']);
        self::assertStringNotContainsString('Ein Beitrag', $this->request('/feed.xml')->getContent());

        // A child cannot come back before its parent, because its address needs it.
        try {
            $this->pages->restorePage($child);
            self::fail('Expected the child to wait for its parent.');
        } catch (InvalidPage) {
        }
        $this->pages->restorePage($parent);
        $this->pages->restorePage($child);
        self::assertSame(200, $this->request('/leistungen/webdesign')->getStatusCode());
        // Only the post is left in the bin; restoring one page does not restore another.
        self::assertSame([$post], array_column($this->pages->trash(), 'id'));
    }

    public function testRestoringARevisionKeepsTheWholeHistory(): void
    {
        $first = DemoContent::starter('Erste Fassung');
        $second = DemoContent::starter('Zweite Fassung');
        $this->pages->saveDraft('page-1', $first, 0);
        $this->pages->saveDraft('page-1', $second, 1);
        $revisions = $this->pages->revisions('page-1');
        self::assertSame(['Zweite Fassung', 'Erste Fassung'], array_column($revisions, 'title'), 'Newest first.');
        self::assertTrue($revisions[0]['draft']);

        $oldest = end($revisions);
        $this->pages->restoreRevision('page-1', $oldest['id'], 2);
        self::assertSame('Erste Fassung', $this->pages->findForEditor('page-1')['document']['title']);
        // Restoring adds a revision instead of overwriting one, so nothing is lost.
        self::assertCount(3, $this->pages->revisions('page-1'));
        self::assertSame('Zweite Fassung', $this->pages->revisions('page-1')[1]['title']);

        $foreign = $this->pages->saveDraft('page-2', DemoContent::starter('Fremd'), 0);
        $this->expectException(InvalidPage::class);
        $this->pages->restoreRevision('page-1', $foreign, 3);
    }

    public function testScheduledPublicationHappensOnlyWhenItIsDue(): void
    {
        $id = $this->pages->createPage('geplant', null, 'page', DemoContent::starter('Geplant'));
        $this->pages->schedule($id, gmdate('Y-m-d H:i', time() + 86400), $this->pages->findForEditor($id)['version']);
        self::assertSame([], $this->pages->publishDue(), 'A future date publishes nothing.');
        self::assertSame(404, $this->request('/geplant')->getStatusCode());

        $this->pages->schedule($id, gmdate('Y-m-d H:i', time() - 3600), $this->pages->findForEditor($id)['version']);
        self::assertSame(['geplant'], $this->pages->publishDue());
        self::assertSame(200, $this->request('/geplant')->getStatusCode());
        // The schedule is consumed, so a later run does not publish again.
        self::assertNull($this->db->fetchOne('SELECT publish_at FROM page WHERE id = ?', [$id]));
        self::assertSame([], $this->pages->publishDue());

        // A trashed page is never published by the schedule.
        $trashed = $this->pages->createPage('versteckt', null, 'page', DemoContent::starter('Versteckt'));
        $this->pages->schedule($trashed, gmdate('Y-m-d H:i', time() - 3600), $this->pages->findForEditor($trashed)['version']);
        $this->pages->trashPage($trashed, $this->db->fetchOne('SELECT version FROM page WHERE id = ?', [$trashed]));
        self::assertSame([], $this->pages->publishDue());

        $this->expectException(InvalidPage::class);
        $this->pages->schedule($id, '12.09.2026', $this->db->fetchOne('SELECT version FROM page WHERE id = ?', [$id]));
    }

    private function publishedChild(string $slug, string $title, string $parentId): string
    {
        $id = $this->pages->createPage($slug, $parentId, 'page', DemoContent::starter($title));
        $page = $this->pages->findForEditor($id);
        $this->pages->publish($id, $page['draft_revision_id'], $page['version']);

        return $id;
    }

    public function testAnyPublishedPageCanBecomeTheRootAndEverythingFollows(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $start = $this->publishedPage('willkommen', 'Willkommen');
        self::assertNotNull($this->pages->findForEditor($start));
        $this->site->save(['country' => 'DE', 'homePath' => 'willkommen', 'legalName' => 'Kant-IT', 'street' => 'Ooser Hauptstr. 51', 'city' => 'Baden-Baden']);

        // The chosen page answers at the root, and its own address redirects there.
        $root = $this->request('/');
        self::assertSame(200, $root->getStatusCode());
        self::assertStringContainsString('>Willkommen</h1>', $root->getContent());
        self::assertStringContainsString('href="https://cms.test/"', $root->getContent());
        $own = $this->request('/willkommen');
        self::assertSame(301, $own->getStatusCode());
        self::assertSame('/', $own->headers->get('Location'));

        // The previous root became an ordinary page and keeps its own address.
        self::assertSame(200, $this->request('/home')->getStatusCode());

        // Sitemap, structured data and the menu follow the same decision.
        self::assertStringContainsString('<loc>https://cms.test/</loc>', $this->request('/sitemap.xml')->getContent());
        self::assertStringContainsString('<loc>https://cms.test/home</loc>', $this->request('/sitemap.xml')->getContent());
        self::assertStringContainsString('"@type":"Organization"', $root->getContent(), 'Organisation data belongs on the root page.');
        self::assertStringNotContainsString('schema.org', $this->request('/home')->getContent());
        $this->menus->save('header', 'Hauptnavigation', [
            ['label' => 'Start', 'type' => 'page', 'pageId' => $start, 'anchor' => '', 'children' => []],
        ], 0);
        self::assertStringContainsString('<a href="/" aria-current="page">Start</a>', $this->request('/')->getContent());

        // The root is protected from being renamed or binned while it is the root.
        foreach ([fn () => $this->pages->movePage($start, 'anders', null, $this->pages->findForEditor($start)['version'], $this->redirects),
            fn () => $this->pages->trashPage($start, $this->pages->findForEditor($start)['version'])] as $attempt) {
            try {
                $attempt();
                self::fail('Expected the root page to be protected.');
            } catch (InvalidPage) {
            }
        }
        // But the page that used to be the root can now be moved.
        self::assertSame(1, $this->pages->movePage('page-1', 'alte-startseite', null, $this->pages->findForEditor('page-1')['version'], $this->redirects));
    }

    public function testRootMustBeAnExistingPublishedPage(): void
    {
        $before = $this->site->load()['homePath'];
        foreach (['gibt-es-nicht', '', 'Gross'] as $candidate) {
            try {
                $this->site->save(['country' => 'DE', 'homePath' => $candidate]);
                self::fail(sprintf('Expected "%s" to be refused as the root.', $candidate));
            } catch (InvalidPage) {
            }
        }
        self::assertSame($before, $this->site->load()['homePath']);
    }

    public function testHeaderAndFooterAreEditableDocumentsThatReachEveryPage(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $second = $this->publishedPage('zweite', 'Zweite Seite');
        self::assertNotNull($this->pages->findForEditor($second));

        // The seeded areas render as ordinary blocks, and the navigation block shows the menu.
        $this->menus->save('header', 'Hauptnavigation', [
            ['label' => 'Start', 'type' => 'page', 'pageId' => 'page-1', 'anchor' => '', 'children' => []],
        ], 0);
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('<header class="site-header">', $html);
        self::assertStringContainsString('<p id="area-header-name" class="block-text">kantsites</p>', $html);
        self::assertStringContainsString('aria-label="Hauptnavigation"', $html);
        self::assertStringContainsString('>Start</a>', $html);

        // Changing the header reaches every page at once, because it is one shared document.
        $header = $this->partials->findByKind('header');
        $document = $header['document'];
        $document['blocks'][0]['children'][0]['children'][0]['children'][0]['props']['text'] = 'Neue Wortmarke';
        $this->partials->save($header['id'], $document, $header['version']);
        foreach (['/', '/zweite'] as $path) {
            self::assertStringContainsString('Neue Wortmarke', $this->request($path)->getContent(), $path);
            self::assertStringNotContainsString('kantsites', $this->request($path)->getContent(), $path);
        }

        // An emptied area renders nothing rather than leaving a broken shell behind.
        $footer = $this->partials->findByKind('footer');
        $this->partials->save($footer['id'], [...$footer['document'], 'blocks' => []], $footer['version']);
        self::assertStringContainsString('<footer class="site-footer">', $this->request('/')->getContent());
        self::assertStringNotContainsString('Viele Möglichkeiten', $this->request('/')->getContent());
    }

    public function testALinkedSectionChangesOnEveryPageThatEmbedsIt(): void
    {
        $sectionId = $this->partials->create('section', 'aufruf', 'Aufruf-Band', [
            'schemaVersion' => 11, 'title' => 'Aufruf-Band', 'description' => 'Wiederverwendbar.',
            'blocks' => [['id' => 'cta-section', 'type' => 'section', 'children' => [
                ['id' => 'cta-heading', 'type' => 'heading', 'props' => ['text' => 'Bereit?', 'level' => 2]],
            ]]],
        ]);

        $withRef = static function (string $title): array {
            $document = DemoContent::starter($title);
            $document['schemaVersion'] = 11;
            $document['blocks'][] = ['id' => 'ref', 'type' => 'partialref', 'props' => ['partial' => 'aufruf']];

            return $document;
        };
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $withRef('Erste'), 0), 1);
        $other = $this->pages->createPage('zweite', null, 'page', $withRef('Zweite'));
        $page = $this->pages->findForEditor($other);
        $this->pages->publish($other, $page['draft_revision_id'], $page['version']);

        foreach (['/', '/zweite'] as $path) {
            self::assertStringContainsString('Bereit?', $this->request($path)->getContent(), $path);
        }
        // The page documents carry only the address, never the section's blocks.
        self::assertSame(['partial' => 'aufruf'], $this->pages->findPublished('zweite')['document']['blocks'][2]['props']);

        // One change in the section reaches both pages.
        $section = $this->partials->find($sectionId);
        $document = $section['document'];
        $document['blocks'][0]['children'][0]['props']['text'] = 'Jetzt anfragen';
        $this->partials->save($sectionId, $document, $section['version']);
        foreach (['/', '/zweite'] as $path) {
            self::assertStringContainsString('Jetzt anfragen', $this->request($path)->getContent(), $path);
            self::assertStringNotContainsString('Bereit?', $this->request($path)->getContent(), $path);
        }
        self::assertSame(['/home', '/zweite'], $this->partials->usedBy('aufruf'));

        // Removing the section leaves both pages intact; the reference stays stored.
        $this->partials->delete($sectionId);
        $stripped = $this->request('/');
        self::assertSame(200, $stripped->getStatusCode());
        self::assertStringContainsString('<!-- Verknüpfte Sektion aufruf ist nicht vorhanden. -->', $stripped->getContent());
        self::assertSame('aufruf', $this->pages->findPublished('home')['document']['blocks'][2]['props']['partial']);
    }

    public function testSharedAreasRefuseAMainHeadingAndSectionsRefuseToContainThemselves(): void
    {
        // A page brings its own main heading; an area appearing on every page must not add one.
        try {
            $this->partials->create('section', 'mit-h1', 'Mit H1', [
                'schemaVersion' => 11, 'title' => 'Mit H1', 'description' => 'x',
                'blocks' => [['id' => 'h', 'type' => 'heading', 'props' => ['text' => 'Titel', 'level' => 1]]],
            ]);
            self::fail('Expected a main heading in a shared area to be refused.');
        } catch (InvalidDocument) {
        }

        $id = $this->partials->create('section', 'selbst', 'Selbstbezug', [
            'schemaVersion' => 11, 'title' => 'Selbstbezug', 'description' => 'x',
            'blocks' => [['id' => 's', 'type' => 'section', 'children' => []]],
        ]);
        $cyclic = ['schemaVersion' => 11, 'title' => 'Selbstbezug', 'description' => 'x', 'blocks' => [
            ['id' => 's', 'type' => 'partialref', 'props' => ['partial' => 'selbst']],
        ]];
        try {
            $this->partials->save($id, $cyclic, $this->partials->find($id)['version']);
            self::fail('Expected a section containing itself to be refused.');
        } catch (InvalidPage) {
        }
        // Nothing was written, so the section still holds its original block.
        self::assertSame('section', $this->partials->find($id)['document']['blocks'][0]['type']);

        // Only one header and one footer.
        try {
            $this->partials->create('header', 'zweiter', 'Zweiter Kopf', ['schemaVersion' => 11, 'title' => 'x', 'description' => 'x', 'blocks' => []]);
            self::fail('Expected a second header to be refused.');
        } catch (InvalidPage) {
        }
        // And they cannot be deleted, only emptied.
        $this->expectException(InvalidPage::class);
        $this->partials->delete($this->partials->findByKind('header')['id']);
    }

    /**
     * @return iterable<string, array{string, string}>
     */
    public static function richTextCases(): iterable
    {
        yield 'keeps allowed formatting' => ['Ganz <strong>fett</strong> und <em>kursiv</em>.', 'Ganz <strong>fett</strong> und <em>kursiv</em>.'];
        yield 'keeps lists' => ['<ul><li>eins</li><li>zwei</li></ul>', '<ul><li>eins</li><li>zwei</li></ul>'];
        yield 'drops a script and keeps the text after it' => ['<script>alert(1)</script>Text danach', 'Text danach'];
        yield 'drops an event handler' => ['<p onclick="steal()">Mit Ereignis</p>', '<p>Mit Ereignis</p>'];
        yield 'drops style and class' => ['<div class="x" style="position:fixed">Verpackt</div>', 'Verpackt'];
        yield 'turns an unsafe link into text' => ['<a href="javascript:alert(1)">Boese</a>', 'Boese'];
        yield 'removes an image with a handler' => ['<img src=x onerror=alert(1)>', ''];
        yield 'turns a newline into a break next to markup' => ["<b>Eins</b>\nZwei", '<b>Eins</b><br>Zwei'];
        yield 'removes an iframe' => ['<iframe src="https://evil.example"></iframe>ok', 'ok'];
        yield 'closes unbalanced markup' => ['<strong>unge<em>schlossen', '<strong>unge<em>schlossen</em></strong>'];
        yield 'keeps a local link' => ['<a href="/kontakt">hier</a>', '<a href="/kontakt">hier</a>'];
        yield 'marks an external link' => ['<a href="https://example.com">dort</a>', '<a href="https://example.com" rel="noopener">dort</a>'];
        yield 'escapes plain text and keeps the line break' => ["Eins <3\nZwei", 'Eins &lt;3<br>Zwei'];
    }

    #[DataProvider('richTextCases')]
    public function testTheAllowlistKeepsFormattingAndRemovesEverythingElse(string $input, string $expected): void
    {
        self::assertSame($expected, (new RichText())->sanitise($input));
    }

    public function testFilteringHappensWhenTheDocumentIsStored(): void
    {
        $document = DemoContent::starter('Formatiert');
        $document['schemaVersion'] = 12;
        $document['blocks'][1]['children'][1]['props']['text'] = '<b>Fett</b><script>alert(1)</script> und <span style="position:fixed">verpackt</span>';
        $revision = $this->pages->saveDraft('page-1', $document, 0);

        // The filtering happens on the way in, so the database already holds the safe version and
        // no renderer has to remember to escape anything.
        $stored = json_decode($this->db->fetchOne('SELECT document FROM revision WHERE id = ?', [$revision]), true);
        self::assertSame('<b>Fett</b> und verpackt', $stored['blocks'][1]['children'][1]['props']['text']);

        // A text that consists only of disallowed markup ends up empty, and an empty text block
        // is refused - the same rule as for a text block somebody clears by hand.
        $document['blocks'][1]['children'][1]['props']['text'] = '<img src=x onerror=alert(1)>';
        try {
            $this->pages->saveDraft('page-1', $document, 1);
            self::fail('Expected an emptied text block to be refused.');
        } catch (InvalidDocument) {
        }
        self::assertSame(1, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision WHERE page_id = ?', ['page-1']));
    }

    public function testFormattedTextIsPrintedAsMarkupFromVersionTwelveOnAndEscapedBefore(): void
    {
        $markup = 'Ein <strong>starker</strong> Satz mit <a href="/kontakt">Link</a>.';

        // v12: the stored markup reaches the page as markup.
        $twelve = DemoContent::starter('Formatiert');
        $twelve['schemaVersion'] = 12;
        $twelve['blocks'][1]['children'][1]['props']['text'] = $markup;
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $twelve, 0), 1);
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('<strong>starker</strong>', $html);
        self::assertStringContainsString('<a href="/kontakt">Link</a>', $html);
        // A div, not a p: the allowlist includes lists and paragraphs, which may not nest in one.
        self::assertStringContainsString('<div id="start-text" class="block-text">', $html);

        // An older document keeps plain text semantics, so nothing there is ever printed as markup.
        $old = DemoContent::starter('Einfach');
        $old['schemaVersion'] = 3;
        $old['blocks'][1]['children'][1]['props']['text'] = $markup;
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $old, 2), 3);
        $plain = $this->request('/')->getContent();
        self::assertStringContainsString('&lt;strong&gt;starker&lt;/strong&gt;', $plain);
        self::assertStringNotContainsString('<strong>starker</strong>', $plain);
        self::assertStringContainsString('<p id="start-text" class="block-text">', $plain);
    }

    public function testFormattedTextInASharedAreaIsFilteredTheSameWay(): void
    {
        $header = $this->partials->findByKind('header');
        $document = $header['document'];
        $document['schemaVersion'] = 12;
        $document['blocks'][0]['children'][0]['children'][0]['children'][0]['props']['text'] =
            '<strong>kant</strong> cms<script>alert(1)</script>';
        $this->partials->save($header['id'], $document, $header['version']);

        $stored = $this->partials->findByKind('header')['document'];
        self::assertSame('<strong>kant</strong> cms', $stored['blocks'][0]['children'][0]['children'][0]['children'][0]['props']['text']);

        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('<strong>kant</strong> cms', $html);
        self::assertStringNotContainsString('alert(1)', $html);
    }

    public function testOversizedFormattedTextIsRefused(): void
    {
        $document = DemoContent::starter('Zu lang');
        $document['schemaVersion'] = 12;
        $document['blocks'][1]['children'][1]['props']['text'] = str_repeat('a', RichText::MAX_LENGTH + 1);
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    /**
     * @return iterable<string, array{string, string}>
     */
    public static function ownCssCases(): iterable
    {
        yield 'declarations' => ['color: red; padding: 12px', '#b1{color:red;padding:12px}'];
        yield 'nested state' => ['&:hover { color: #000 }', '#b1:hover{color:#000}'];
        yield 'descendant keeps its space' => ['& .block-text { font-size: 20px }', '#b1 .block-text{font-size:20px}'];
        yield 'child combinator' => ['& > p { margin: 0 }', '#b1 > p{margin:0}'];
        yield 'local image' => ['background: url(/bild.png)', '#b1{background:url(/bild.png)}'];
    }

    #[DataProvider('ownCssCases')]
    public function testOwnCssIsScopedToItsElement(string $css, string $expected): void
    {
        self::assertSame($expected, (new CustomCode())->compileCss('b1', $css));
    }

    /**
     * @return iterable<string, array{string}>
     */
    public static function refusedOwnCss(): iterable
    {
        yield 'escaping the block' => ['color:red} body{display:none'];
        yield 'foreign selector' => ['body { color: red }'];
        yield 'at rule' => ['@import url(https://evil.example/x.css)'];
        yield 'media query' => ['@media (max-width: 100px) { color: red }'];
        yield 'javascript url' => ['background: url(javascript:alert(1))'];
        yield 'protocol relative url' => ['background: url(//evil.example/x.png)'];
        yield 'backslash escape' => ['content: "\\65"'];
        yield 'old expression syntax' => ['color: expression(alert(1))'];
        yield 'no value' => ['color'];
        yield 'nonsense property' => ['co lor: red'];
    }

    #[DataProvider('refusedOwnCss')]
    public function testRefusedOwnCssNeverReachesADocument(string $css): void
    {
        $document = DemoContent::starter('Mit CSS');
        $document['schemaVersion'] = 13;
        $document['blocks'][0]['css'] = $css;
        try {
            $this->pages->saveDraft('page-1', $document, 0);
            self::fail(sprintf('Expected "%s" to be refused.', $css));
        } catch (InvalidDocument) {
        }
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision WHERE page_id = ?', ['page-1']));
    }

    public function testOwnCssReachesThePageStylesheetAndOwnScriptItsOwnFile(): void
    {
        $document = DemoContent::starter('Mit eigenem Code');
        $document['schemaVersion'] = 13;
        $document['blocks'][0]['css'] = 'letter-spacing: 2px; &:hover { opacity: 0.8 }';
        $document['blocks'][0]['script'] = "element.dataset.ready = 'yes';";
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);

        $response = $this->request('/');
        $html = $response->getContent();
        self::assertStringContainsString('#start-hero{letter-spacing:2px}', $html);
        self::assertStringContainsString('#start-hero:hover{opacity:0.8}', $html);

        // The script is a file, never inline, and the policy opens only for this origin.
        self::assertStringContainsString('<script src="/assets/seite/page-1.js" defer></script>', $html);
        self::assertStringNotContainsString('element.dataset.ready', $html);
        self::assertStringContainsString("script-src 'self'", (string) $response->headers->get('Content-Security-Policy'));

        $script = $this->request('/assets/seite/page-1.js');
        self::assertSame(200, $script->getStatusCode());
        self::assertStringContainsString('text/javascript', (string) $script->headers->get('Content-Type'));
        // Each script runs in its own closure with its element already looked up.
        self::assertStringContainsString('document.getElementById("start-hero")', $script->getContent());
        self::assertStringContainsString("element.dataset.ready = 'yes';", $script->getContent());

        // A page without own script keeps the strict policy and loads no file.
        $plain = $this->publishedPage('ohne-code', 'Ohne Code');
        self::assertNotNull($this->pages->findForEditor($plain));
        $other = $this->request('/ohne-code');
        self::assertStringNotContainsString('/assets/seite/', $other->getContent());
        self::assertStringContainsString("script-src 'none'", (string) $other->headers->get('Content-Security-Policy'));
        self::assertSame(404, $this->request('/assets/seite/'.$plain.'.js')->getStatusCode());
    }

    public function testADraftScriptIsNotServedToVisitors(): void
    {
        $document = DemoContent::starter('Nur Entwurf');
        $document['schemaVersion'] = 13;
        $document['blocks'][0]['script'] = "element.dataset.draft = 'yes';";
        $this->pages->saveDraft('page-1', $document, 0);

        // Saved but not published, so the script file must not exist yet.
        self::assertSame(404, $this->request('/assets/seite/page-1.js')->getStatusCode());
    }

    public function testOwnCodeNeedsSchemaThirteen(): void
    {
        $document = DemoContent::starter('Zu alt');
        $document['schemaVersion'] = 12;
        $document['blocks'][0]['css'] = 'color: red';
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testScriptChangesAreComparedAgainstWhatIsStored(): void
    {
        $code = new CustomCode();
        $stored = DemoContent::starter('Mit Skript');
        $stored['schemaVersion'] = 13;
        $stored['blocks'][0]['script'] = "element.dataset.a = '1';";

        // Same scripts: an editor may keep saving the page.
        $unchanged = $stored;
        $unchanged['title'] = 'Anderer Titel';
        $code->assertScriptsUnchanged($unchanged, $stored);

        foreach (['changed' => "element.dataset.a = '2';", 'removed' => null] as $case => $script) {
            $attempt = $stored;
            if (null === $script) {
                unset($attempt['blocks'][0]['script']);
            } else {
                $attempt['blocks'][0]['script'] = $script;
            }
            try {
                $code->assertScriptsUnchanged($attempt, $stored);
                self::fail(sprintf('Expected a %s script to be refused.', $case));
            } catch (InvalidDocument) {
            }
        }

        // And adding one to a page that had none is refused as well.
        $added = DemoContent::starter('Neu');
        $added['schemaVersion'] = 13;
        $before = $added;
        $added['blocks'][0]['script'] = 'alert(1)';
        $this->expectException(InvalidDocument::class);
        $code->assertScriptsUnchanged($added, $before);
    }

    /** Turns on the consent question and publishes a privacy page it can point to. */
    private function askConsent(array $groups = ['external']): void
    {
        $this->publishedPage('datenschutz', 'Datenschutz');
        $this->site->save([
            'homePath' => 'home',
            'consentBanner' => '1',
            'consentGroups' => $groups,
            'privacyPath' => 'datenschutz',
        ]);
    }

    public function testALegalPathMustPointAtAPageThatExists(): void
    {
        foreach (['privacyPath', 'imprintPath'] as $key) {
            try {
                $this->site->save(['homePath' => 'home', $key => 'gibt-es-nicht']);
                self::fail('Expected '.$key.' to be refused.');
            } catch (InvalidPage) {
            }
            self::assertSame('', $this->site->load()[$key]);
        }
        // A page that exists is accepted and then linked on every page.
        $this->publishedPage('datenschutz', 'Datenschutz');
        $this->site->save(['homePath' => 'home', 'privacyPath' => 'datenschutz']);
        self::assertSame('datenschutz', $this->site->load()['privacyPath']);
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        self::assertStringContainsString('<a href="/datenschutz">Datenschutz</a>', $this->request('/')->getContent());
    }

    public function testADeliveredPageIncrementsOneCounterAndTheAdministrationDoesNot(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $this->request('/');
        $this->request('/');
        // A page that does not exist counts as a missing address, not as a page view.
        $this->request('/gibt-es-nicht');
        // Everything that is not a page of the site stays out of the numbers.
        $this->request('/admin');
        $this->request('/feed.xml');
        $this->request('/robots.txt');

        $rows = $this->db->fetchAllAssociative('SELECT path, status, count FROM stat_hit ORDER BY status');
        self::assertSame([
            ['path' => '/', 'status' => 200, 'count' => 2],
            ['path' => '/gibt-es-nicht', 'status' => 404, 'count' => 1],
        ], array_map(static fn (array $row): array => ['path' => $row['path'], 'status' => (int) $row['status'], 'count' => (int) $row['count']], $rows));
    }

    public function testWithoutEmbedsThereIsNoConsentQuestion(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $html = $this->request('/')->getContent();
        // Nothing is loaded from anywhere else, so there is nothing to ask about - and a banner
        // without a reason is only in the way.
        self::assertStringNotContainsString('consent-bar', $html);
        self::assertStringNotContainsString('Einwilligung ändern', $html);
        self::assertSame(404, $this->request('/einwilligung')->getStatusCode());
    }

    public function testTheQuestionAppearsUntilItIsAnsweredAndCanBeChangedAgain(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $this->askConsent();

        $response = $this->request('/');
        $html = $response->getContent();
        self::assertStringContainsString('consent-bar', $html);
        // Accepting and refusing are both buttons of the same form, so neither is hidden away.
        self::assertStringContainsString('value="all"', $html);
        self::assertStringContainsString('value="none"', $html);
        self::assertStringContainsString('/datenschutz', $html);
        // No script anywhere: the strict policy stays as it is.
        self::assertStringContainsString("script-src 'none'", (string) $response->headers->get('Content-Security-Policy'));

        $saved = $this->request('/einwilligung', 'POST', ['choice' => 'all', 'back' => '/']);
        self::assertSame(302, $saved->getStatusCode());
        self::assertSame('/', $saved->headers->get('Location'));
        $cookie = $saved->headers->getCookies()[0];
        self::assertSame(Consent::COOKIE, $cookie->getName());
        self::assertTrue($cookie->isHttpOnly());
        self::assertSame('lax', $cookie->getSameSite());
        self::assertStringContainsString('external', (string) $cookie->getValue());

        // With a decision in hand the banner is gone, but the way back to it is not.
        $decided = $this->request('/', 'GET', [], [Consent::COOKIE => (string) $cookie->getValue()]);
        self::assertStringNotContainsString('consent-bar', $decided->getContent());
        self::assertStringContainsString('/einwilligung', $decided->getContent());
        self::assertSame(200, $this->request('/einwilligung', 'GET', [], [Consent::COOKIE => (string) $cookie->getValue()])->getStatusCode());
    }

    /** @return iterable<string, array{string, bool}> */
    public static function consentCookies(): iterable
    {
        yield 'granted' => ['1|external|'.time(), true];
        yield 'refused' => ['1|<EMPTY>|'.time(), false];
        yield 'other group only' => ['1|statistics|'.time(), false];
        yield 'expired' => ['1|external|'.(time() - Consent::MAX_AGE - 60), false];
        yield 'older question' => ['0|external|'.time(), false];
        yield 'nonsense' => ['ganz-egal', false];
        yield 'unknown group' => ['1|erfunden|'.time(), false];
    }

    #[DataProvider('consentCookies')]
    public function testAnEmbedLoadsOnlyWithAValidDecisionForItsGroup(string $cookie, bool $expected): void
    {
        $document = DemoContent::starter('Mit Karte');
        $document['schemaVersion'] = 14;
        $document['blocks'][] = [
            'id' => 'karte', 'type' => 'embed',
            'props' => ['group' => 'external', 'title' => 'Anfahrt', 'provider' => 'OpenStreetMap', 'url' => 'https://karten.example/einbetten?ort=kant', 'hint' => '', 'height' => 400],
        ];
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);
        $this->askConsent();

        $response = $this->request('/', 'GET', [], [Consent::COOKIE => str_replace('<EMPTY>', '', $cookie)]);
        $html = $response->getContent();
        $policy = (string) $response->headers->get('Content-Security-Policy');
        if ($expected) {
            self::assertStringContainsString('<iframe src="https://karten.example/einbetten?ort=kant"', $html);
            self::assertStringContainsString('title="Anfahrt"', $html);
            self::assertStringContainsString('frame-src https://karten.example', $policy);
        } else {
            // Not a hidden iframe, not a lazy one: the address does not appear at all.
            self::assertStringNotContainsString('<iframe', $html);
            self::assertStringNotContainsString('karten.example/einbetten', $html);
            self::assertStringContainsString('OpenStreetMap', $html, 'The placeholder names the provider.');
            self::assertStringContainsString("frame-src 'none'", $policy);
        }
    }

    public function testTheEmbedButtonGrantsOnlyItsOwnGroupAndKeepsWhatWasGrantedBefore(): void
    {
        $document = DemoContent::starter('Mit Karte');
        $document['schemaVersion'] = 14;
        $document['blocks'][] = [
            'id' => 'karte', 'type' => 'embed',
            'props' => ['group' => 'external', 'title' => 'Anfahrt', 'provider' => 'Karten', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 300],
        ];
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);
        $this->askConsent(['external', 'statistics']);

        // Statistics were granted earlier; loading the map must not take that away.
        $before = '1|statistics|'.time();
        $html = $this->request('/', 'GET', [], [Consent::COOKIE => $before])->getContent();
        self::assertStringContainsString('name="groups[]" value="statistics"', $html);
        self::assertStringContainsString('name="groups[]" value="external"', $html);

        $saved = $this->request('/einwilligung', 'POST', ['choice' => 'some', 'groups' => ['statistics', 'external'], 'back' => '/']);
        $value = (string) $saved->headers->getCookies()[0]->getValue();
        self::assertStringContainsString('statistics', $value);
        self::assertStringContainsString('external', $value);
    }

    public function testTheConsentFormNeverSendsAnyoneElsewhere(): void
    {
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', DemoContent::pages()['home'], 0), 1);
        $this->askConsent();
        foreach (['https://fremd.example/', '//fremd.example/', 'fremd.example', ''] as $target) {
            $response = $this->request('/einwilligung', 'POST', ['choice' => 'none', 'back' => $target]);
            self::assertSame('/', $response->headers->get('Location'), $target);
        }
        // A local path is kept, so the decision returns to the page it was made on.
        self::assertSame('/datenschutz', $this->request('/einwilligung', 'POST', ['choice' => 'none', 'back' => '/datenschutz'])->headers->get('Location'));
    }

    public function testSwitchingTheQuestionOffLetsTheEmbedLoadAgain(): void
    {
        $document = DemoContent::starter('Mit Karte');
        $document['schemaVersion'] = 14;
        $document['blocks'][] = [
            'id' => 'karte', 'type' => 'embed',
            'props' => ['group' => 'external', 'title' => 'Anfahrt', 'provider' => 'Karten', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 300],
        ];
        $this->pages->publish('page-1', $this->pages->saveDraft('page-1', $document, 0), 1);
        // No question asked means nothing is withheld: otherwise turning the banner off would
        // silently empty every page that embeds something.
        $html = $this->request('/')->getContent();
        self::assertStringContainsString('<iframe', $html);
        self::assertStringNotContainsString('consent-bar', $html);
    }

    /** @return iterable<string, array{array<string, mixed>}> */
    public static function refusedEmbeds(): iterable
    {
        yield 'http' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'http://karten.example/x', 'hint' => '', 'height' => 300]];
        yield 'protocol relative' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => '//karten.example/x', 'hint' => '', 'height' => 300]];
        yield 'javascript' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'javascript:alert(1)', 'hint' => '', 'height' => 300]];
        yield 'data url' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'data:text/html,<script>alert(1)</script>', 'hint' => '', 'height' => 300]];
        yield 'with a port' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'https://karten.example:8443/x', 'hint' => '', 'height' => 300]];
        yield 'with credentials' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'https://nutzer:geheim@karten.example/x', 'hint' => '', 'height' => 300]];
        yield 'host with a space' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'https://karten example/x', 'hint' => '', 'height' => 300]];
        yield 'no title' => [['group' => 'external', 'title' => '', 'provider' => '', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 300]];
        yield 'unknown group' => [['group' => 'erfunden', 'title' => 'X', 'provider' => '', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 300]];
        yield 'height too small' => [['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 10]];
    }

    #[DataProvider('refusedEmbeds')]
    public function testRefusedEmbedsNeverReachADocument(array $props): void
    {
        $document = DemoContent::starter('Mit Karte');
        $document['schemaVersion'] = 14;
        $document['blocks'][] = ['id' => 'karte', 'type' => 'embed', 'props' => $props];
        try {
            $this->pages->saveDraft('page-1', $document, 0);
            self::fail('Expected the embed to be refused: '.json_encode($props['url']));
        } catch (InvalidDocument) {
        }
        self::assertSame(0, (int) $this->db->fetchOne('SELECT COUNT(*) FROM revision WHERE page_id = ?', ['page-1']));
    }

    public function testAnEmbedNeedsSchemaFourteen(): void
    {
        $document = DemoContent::starter('Zu alt');
        $document['schemaVersion'] = 13;
        $document['blocks'][] = [
            'id' => 'karte', 'type' => 'embed',
            'props' => ['group' => 'external', 'title' => 'X', 'provider' => '', 'url' => 'https://karten.example/x', 'hint' => '', 'height' => 300],
        ];
        $this->expectException(InvalidDocument::class);
        $this->pages->saveDraft('page-1', $document, 0);
    }

    public function testAConsentBannerNeedsAPrivacyPageThatExists(): void
    {
        foreach ([
            'without a privacy page' => ['consentBanner' => '1', 'consentGroups' => ['external'], 'privacyPath' => ''],
            'pointing nowhere' => ['consentBanner' => '1', 'consentGroups' => ['external'], 'privacyPath' => 'gibt-es-nicht'],
            'without a group' => ['consentBanner' => '1', 'consentGroups' => [], 'privacyPath' => 'datenschutz'],
        ] as $case => $input) {
            try {
                $this->site->save([...$input, 'homePath' => 'home']);
                self::fail('Expected '.$case.' to be refused.');
            } catch (InvalidPage) {
            }
            self::assertFalse($this->site->load()['consentBanner'], $case);
        }
    }

    private function request(string $url, string $method = 'GET', array $body = [], array $cookies = []): Response
    {
        $previous = [];
        foreach (['APP_SECRET' => 'test-only', 'DATABASE_URL' => 'sqlite:///'.str_replace('\\', '/', $this->path), 'SITE_ORIGIN' => 'https://cms.test', 'MEDIA_DIRECTORY' => $this->path.'-media'] as $key => $value) {
            $previous[$key] = [$_SERVER[$key] ?? null, $_ENV[$key] ?? null];
            $_SERVER[$key] = $_ENV[$key] = $value;
        }
        $kernel = new Kernel('test', false);
        try {
            $request = Request::create($url, $method, $body, $cookies);
            $response = $kernel->handle($request);
            // Counting happens on kernel.terminate, so a test that does not terminate would
            // silently test a different application than the one that runs.
            $kernel->terminate($request, $response);

            return $response;
        } finally {
            $kernel->shutdown();
            foreach ($previous as $key => [$server, $env]) {
                if (null === $server) {
                    unset($_SERVER[$key]);
                } else {
                    $_SERVER[$key] = $server;
                }
                if (null === $env) {
                    unset($_ENV[$key]);
                } else {
                    $_ENV[$key] = $env;
                }
            }
        }
    }
}