feat: lit/tb-activate – the explicit switch, always a dry run first (answer F1)

- only _et_enabled; dry run in both directions lists conditions, exclusions, layouts, overlaps and possible overlaps (B9); confirm: true switches - enabling needs conditions and published layouts (B10); a detached template needs reattach first; the default template is refused - the off-switch reaches an attached, enabled template outside publish, e.g. in the trash (ruling Q16); result names the fast way back - every switch in the change log; failed switch rolled back Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-09-27 16:33:29 +02:00
parent 0975b2f69b
commit 64fc439cb2
6 changed files with 598 additions and 4 deletions
@@ -0,0 +1,275 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\ThemeBuilder;
+
+use LIT\MCP\Abilities\Ability;
+use LIT\MCP\Abilities\Annotations;
+use LIT\MCP\Abilities\Errors;
+use LIT\MCP\Abilities\FollowUp;
+use LIT\MCP\Abilities\Rollback;
+use LIT\MCP\Abilities\ToolResult;
+use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\ChangeLog\ChangeLog;
+use Throwable;
+use WP_Error;
+
+defined('ABSPATH') || exit;
+
+/**
+ * lit/tb-activate (answer F1): the one place where LIT MCP makes a template visible to visitors or hides it
+ * again – _et_enabled, nothing else. Always a dry run first (conditions with labels, layouts, identical and
+ * possible overlaps with other live templates – ruling Q8/B9), then confirm: true; both directions, every switch
+ * in the change log. Refused for the default template, a template the live Theme Builder does not list (reattach
+ * first) and, when enabling, one without conditions (it would apply nowhere) or with a layout that is no longer
+ * published (B10). Switching off is the fast way back and fail-safe: it also reaches a live template that is not
+ * published, e.g. in the trash (ruling Q16), and never needs the layouts.
+ */
+final class TbActivateAbility implements Ability
+{
+    public const REASON = 'Die Vorlage konnte nicht umgeschaltet werden.';
+
+    public function __construct(
+        private ThemeBuilderAccess $access,
+        private TemplateConditions $conditions,
+        private ChangeLog $log
+    ) {
+    }
+
+    public function name(): string
+    {
+        return 'lit/tb-activate';
+    }
+
+    public function label(): string
+    {
+        return 'Theme-Builder-Vorlage aktivieren';
+    }
+
+    public function description(): string
+    {
+        return 'Aktiviert (enabled: true) oder deaktiviert (enabled: false) eine Vorlage des Divi Theme Builders – die '
+            . 'einzige Stelle, an der LIT MCP eine Vorlage für Besucher sichtbar macht. Immer zuerst Probelauf '
+            . '(Bedingungen, Layouts, Überschneidungen mit anderen aktiven Vorlagen), dann nach Rückfrage beim Nutzer '
+            . 'confirm: true. Deaktivieren ist der schnelle Weg zurück. template_rev aus lit/tb-list ist Pflicht; die '
+            . 'Standardvorlage nur im Theme Builder.';
+    }
+
+    public function inputSchema(): array
+    {
+        return [
+            'type' => 'object',
+            'properties' => [
+                'template_id' => ['type' => 'integer', 'minimum' => 1],
+                'template_rev' => ['type' => 'string', 'description' => 'template_rev aus lit/tb-list.'],
+                'enabled' => ['type' => 'boolean'],
+                'confirm' => ['type' => 'boolean'],
+            ],
+            'required' => ['template_id', 'template_rev', 'enabled'],
+            'additionalProperties' => false,
+        ];
+    }
+
+    public function outputSchema(): ?array
+    {
+        return ToolResult::schema([
+            'template_id' => ['type' => 'integer'],
+            'template_rev' => ['type' => 'string'],
+            'enabled' => ['type' => 'boolean'],
+            'live' => ['type' => 'boolean'],
+        ], ['template_id', 'template_rev', 'enabled', 'live']);
+    }
+
+    public function annotations(): array
+    {
+        return Annotations::destructive(true);
+    }
+
+    public function isDirect(): bool
+    {
+        return false;
+    }
+
+    public function permission(array $input): bool|WP_Error
+    {
+        $template = $this->access->changeableTemplate($input, ($input['enabled'] ?? null) === false);
+
+        return $template instanceof WP_Error ? $template : true;
+    }
+
+    /** @throws WriteFailed */
+    public function execute(array $input): mixed
+    {
+        $enabled = $input['enabled'] ?? null;
+        $template = $this->access->changeableTemplate($input, $enabled === false);
+        if ($template instanceof WP_Error) {
+            return $template;
+        }
+
+        if (! is_bool($enabled)) {
+            return Errors::invalidInput('enabled fehlt; nichts wurde gespeichert.', ['enabled' => 'true oder false']);
+        }
+
+        if (! $template->attached) {
+            return Errors::invalidInput(
+                sprintf('Vorlage %d ist im Theme Builder nicht zugeordnet; nichts wurde gespeichert.', $template->id),
+                ['template_id' => 'zuerst mit lit/tb-assign und reattach: true wieder zuordnen']
+            );
+        }
+
+        if ($template->enabled === $enabled) {
+            return $this->result($template, sprintf(
+                'Keine Änderung – die Vorlage „%s“ ist bereits %s.',
+                $template->title,
+                $enabled ? 'aktiv' : 'deaktiviert'
+            ), null);
+        }
+
+        if ($enabled) {
+            $refusal = $this->activationRefusal($template);
+            if ($refusal !== null) {
+                return $refusal;
+            }
+        }
+
+        if (($input['confirm'] ?? false) !== true) {
+            return $this->dryRun($template, $enabled);
+        }
+
+        return $this->switch($template, $enabled);
+    }
+
+    /** Enabling needs conditions and published layouts (B10). */
+    private function activationRefusal(Template $template): ?WP_Error
+    {
+        if ($template->useOn === []) {
+            return Errors::invalidInput(
+                'Ohne Bedingungen gilt eine Vorlage nirgends; zuerst mit lit/tb-assign Bedingungen setzen. Nichts '
+                    . 'wurde gespeichert.',
+                ['template_id' => 'keine Bedingungen (use_on)']
+            );
+        }
+
+        return $this->access->layoutsRefusal($template);
+    }
+
+    private function dryRun(Template $template, bool $enabled): WP_Error
+    {
+        $labels = array_map($this->conditions->label(...), $template->useOn);
+        $message = $enabled
+            ? sprintf(
+                'Aktivieren: Die Vorlage „%s“ gilt danach sofort für Besucher (%s). Überschneidungen mit anderen '
+                    . 'aktiven Vorlagen unter overlaps/possible_overlaps. Nichts wurde gespeichert (Probelauf).',
+                $template->title,
+                implode('; ', $labels)
+            )
+            : sprintf(
+                'Deaktivieren: Die Vorlage „%s“%s gilt danach nicht mehr (%s); dort zeigt Divi wieder eine andere '
+                    . 'Vorlage, die Standardvorlage oder das Theme. Nichts wurde gespeichert (Probelauf).',
+                $template->title,
+                $template->status === 'publish' ? '' : sprintf(' (im Papierkorb oder Status „%s“)', $template->status),
+                implode('; ', $labels)
+            );
+        $live = $enabled ? $this->access->store()->liveTemplates() : [];
+
+        return Errors::confirmRequired($message, [
+            'use_on' => $labels,
+            'exclude_from' => array_map($this->conditions->label(...), $template->excludeFrom),
+            'layouts' => $template->layouts,
+            'overlaps' => Template::overlaps($live, $template->id, $template->useOn),
+            'possible_overlaps' => Template::possibleOverlaps($live, $template->id, $template->useOn),
+        ]);
+    }
+
+    /**
+     * @return array<string, mixed>
+     * @throws WriteFailed
+     */
+    private function switch(Template $template, bool $enabled): array
+    {
+        $store = $this->access->store();
+        try {
+            $store->setEnabled($template->id, $enabled);
+        } catch (Throwable $e) {
+            $this->undo($template, $e);
+        }
+
+        $warnings = [];
+        FollowUp::run(
+            static fn () => $store->clearCaches(),
+            'theme builder cache',
+            'Der Cache des Theme Builders konnte nicht geleert werden; die Änderung ist gespeichert, wirkt aber evtl. '
+                . 'erst nach „Statische CSS-Dateien leeren“ (Divi → Theme-Optionen → Builder).',
+            $warnings
+        );
+        $logId = $this->log->record(
+            $this->name(),
+            DiviThemeBuilder::TEMPLATE,
+            (string) $template->id,
+            sprintf(
+                'Theme Builder: Vorlage „%s“ %s (Bedingungen: %s)',
+                $template->title,
+                $enabled ? 'aktiviert' : 'deaktiviert',
+                $template->useOn === [] ? 'keine' : implode(', ', $template->useOn)
+            )
+        );
+        $after = $store->template($template->id, true) ?? $template;
+
+        $summary = $enabled
+            ? sprintf(
+                'Vorlage „%s“ aktiviert – sie gilt jetzt für Besucher. Schneller Weg zurück: lit/tb-activate mit '
+                    . 'enabled: false (template_rev aus dieser Antwort).',
+                $template->title
+            )
+            : sprintf('Vorlage „%s“ deaktiviert – sie gilt nicht mehr für Besucher.', $template->title);
+
+        return $this->result($after, $summary, $logId, $enabled, $warnings);
+    }
+
+    /** @throws WriteFailed Always. */
+    private function undo(Template $template, Throwable $cause): never
+    {
+        $store = $this->access->store();
+        $failures = Rollback::attempt(static fn () => $store->setEnabled($template->id, $template->enabled));
+        if ($failures === []) {
+            throw WriteFailed::rolledBack(self::REASON, $cause, 'tb-activate failed: ' . $cause->getMessage());
+        }
+
+        $this->log->recordPartial(
+            $this->name(),
+            DiviThemeBuilder::TEMPLATE,
+            (string) $template->id,
+            sprintf('Theme Builder: Umschalten von „%s“ nicht zurückgenommen (%s)', $template->title, $failures[0])
+        );
+        throw WriteFailed::partial(
+            self::REASON,
+            $cause,
+            'tb-activate rollback: ' . $failures[0],
+            $template->id,
+            hint: 'Mit lit/tb-list prüfen, ob die Vorlage aktiv ist.'
+        );
+    }
+
+    /**
+     * @param list<string> $warnings
+     * @return array<string, mixed>
+     */
+    private function result(
+        Template $template,
+        string $summary,
+        ?int $logId,
+        ?bool $enabled = null,
+        array $warnings = []
+    ): array {
+        return ToolResult::ok($summary)
+            ->with('template_id', $template->id)
+            ->with('template_rev', $template->rev())
+            ->with('enabled', $enabled ?? $template->enabled)
+            ->with('live', $enabled ?? $template->isLive())
+            ->warnings($warnings)
+            ->logId($logId)
+            ->urls(null, (string) admin_url('admin.php?page=et_theme_builder'))
+            ->toArray();
+    }
+}
@@ -157,15 +157,27 @@ class ThemeBuilderAccess
    /**
     * A template the Theme Builder tools may change (lit/tb-assign, lit/tb-activate): rights and group gate
     * (template(), a template the user may not edit reads as missing – ruling Q18), no Theme Builder draft (E7),
-     * never the default template (E8), the current template_rev.
+     * never the default template (E8), the current template_rev. $offSwitch (lit/tb-activate with enabled: false,
+     * ruling Q16): also a template visitors see although it is not published (e.g. in the trash – Divi renders
+     * every attached, enabled template, B8), so it can always be switched off; any other unpublished template
+     * still reads as missing.
     *
     * @param array<string, mixed> $input template_id, template_rev
     */
-    public function changeableTemplate(array $input): Template|WP_Error
+    public function changeableTemplate(array $input, bool $offSwitch = false): Template|WP_Error
    {
        $post = $this->template($input['template_id'] ?? null, true);
        if ($post instanceof WP_Error) {
-            return $post;
+            $id = $offSwitch && Errors::codeOf($post) === 'not_found'
+                ? $this->liveUnpublished($input['template_id'] ?? null)
+                : null;
+            if ($id === null) {
+                return $post;
+            }
+
+            $gate = $this->writableGate();
+
+            return $gate ?? $this->checkedTemplate($id, $input);
        }

        return $this->checkedTemplate((int) $post->ID, $input);
@@ -262,6 +274,27 @@ class ThemeBuilderAccess
        );
    }

+    /**
+     * ID of a template that is not published but live (listed by the live Theme Builder post and enabled) and the
+     * user may edit; null otherwise – the raw lookup of the off-switch (ruling Q16).
+     */
+    private function liveUnpublished(mixed $templateId): ?int
+    {
+        $id = PostGuard::id($templateId);
+        $post = $id === null ? null : get_post($id);
+        if (
+            ! $post instanceof WP_Post
+            || $post->post_type !== DiviThemeBuilder::TEMPLATE
+            || (string) $post->post_status === 'publish'
+            || ! $this->canEditTemplate((int) $post->ID)
+            || ! in_array((int) $post->ID, $this->store->templateIds($this->store->liveId()), true)
+        ) {
+            return null;
+        }
+
+        return $this->store->template((int) $post->ID, true)?->isLive() === true ? (int) $post->ID : null;
+    }
+
    /**
     * The draft, default and template_rev checks of changeableTemplate() for template $id (rights already checked).
     *
@@ -53,6 +53,7 @@ final class ThemeBuilderIntegration implements Integration
            new TbListAbility($this->access, $conditions),
            new TbCreateTemplateAbility($this->access, $conditions, $this->composition, $this->saver, $this->log),
            new TbAssignAbility($this->access, $conditions, $this->log),
+            new TbActivateAbility($this->access, $conditions, $this->log),
        ];
    }
 }
@@ -78,7 +78,7 @@ final class DiviIntegrationTest extends TestCase
        self::assertSame('Divi Theme Builder', $group->label());
        self::assertFalse($group->isAvailable(), 'no Divi classes in unit tests');
        self::assertSame(
-            ['lit/tb-list', 'lit/tb-create-template', 'lit/tb-assign'],
+            ['lit/tb-list', 'lit/tb-create-template', 'lit/tb-assign', 'lit/tb-activate'],
            array_map(static fn (Ability $ability): string => $ability->name(), $group->abilities())
        );
        foreach ($group->abilities() as $ability) {
@@ -0,0 +1,246 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Divi\ThemeBuilder;
+
+use Brain\Monkey\Functions;
+use LIT\MCP\Abilities\WriteFailed;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\DiviThemeBuilder;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\TbActivateAbility;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\Template;
+use LIT\MCP\Integrations\Divi\ThemeBuilder\TemplateConditions;
+use LIT\MCP\Tests\Support\DiviWriterFixture;
+use LIT\MCP\Tests\Support\FakeChangeLog;
+use LIT\MCP\Tests\Support\LibraryFixtures;
+use LIT\MCP\Tests\Support\ThemeBuilderFixtures;
+use LIT\MCP\Tests\Unit\TestCase;
+use RuntimeException;
+
+final class TbActivateAbilityTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+        self::givenPosts();
+        Functions\when('admin_url')->alias(static fn (string $path): string => 'https://kunde.test/wp-admin/' . $path);
+    }
+
+    /**
+     * @param array<string, mixed> $templateFields
+     * @param array<string, mixed> $bodyFields
+     */
+    private static function givenPosts(array $templateFields = [], array $bodyFields = []): void
+    {
+        LibraryFixtures::given([
+            ThemeBuilderFixtures::templatePost(1066, $templateFields),
+            ThemeBuilderFixtures::templatePost(1065),
+            ThemeBuilderFixtures::layout(1061),
+            ThemeBuilderFixtures::layout(1062, $bodyFields),
+            ThemeBuilderFixtures::layout(1063),
+        ]);
+    }
+
+    private static function ability(DiviThemeBuilder $store, ?FakeChangeLog $log = null): TbActivateAbility
+    {
+        return new TbActivateAbility(
+            ThemeBuilderFixtures::access([], true, $store),
+            new TemplateConditions($store),
+            $log ?? DiviWriterFixture::log()
+        );
+    }
+
+    /** @return array<string, mixed> */
+    private static function input(Template $template, bool $enabled, bool $confirm = false): array
+    {
+        return array_filter([
+            'template_id' => $template->id,
+            'template_rev' => $template->rev(),
+            'enabled' => $enabled,
+            'confirm' => $confirm ?: null,
+        ], static fn (mixed $value): bool => $value !== null);
+    }
+
+    public function testActivationIsAlwaysADryRunFirst(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $other = ThemeBuilderFixtures::template(1070, [
+            'enabled' => true,
+            'title' => 'Seite 1053',
+            'use_on' => ['singular:post_type:page:id:1053'],
+        ]);
+        $pages = ThemeBuilderFixtures::template(1071, [
+            'enabled' => true,
+            'title' => 'Alle Seiten',
+            'use_on' => ['singular:post_type:page:all'],
+        ]);
+        $store = ThemeBuilderFixtures::store([$template, $other, $pages]);
+        $store->shouldReceive('setEnabled')->never();
+
+        $dry = self::ability($store, FakeChangeLog::forbidden())->execute(self::input($template, true));
+
+        self::assertToolError($dry, 'confirm_required');
+        self::assertStringContainsString('Aktivieren', self::clientError($dry)['message']);
+        self::assertSame(['Bestimmte Seiten: 1053'], $dry->get_error_data()['use_on']);
+        self::assertSame([], $dry->get_error_data()['exclude_from']);
+        self::assertSame(1070, $dry->get_error_data()['overlaps'][0]['id']);
+        self::assertSame(1071, $dry->get_error_data()['possible_overlaps'][0]['id']);
+        self::assertSame(1062, $dry->get_error_data()['layouts']['body']['id']);
+    }
+
+    public function testConfirmedActivationSwitchesOnlyTheFlag(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([$template]);
+        $store->shouldReceive('setEnabled')->once()->with(1066, true);
+        $store->shouldReceive('clearCaches')->once();
+        $store->shouldReceive('setConditions')->never();
+        $store->shouldReceive('attach')->never();
+        $log = DiviWriterFixture::log();
+
+        $result = self::ability($store, $log)->execute(self::input($template, true, true));
+
+        self::assertTrue($result['ok']);
+        self::assertTrue($result['enabled']);
+        self::assertTrue($result['live']);
+        self::assertStringContainsString('aktiviert', $result['summary']);
+        self::assertStringContainsString('enabled: false', $result['summary'], 'the way back is named');
+        self::assertSame(4711, $result['log_id']);
+        self::assertStringContainsString('aktiviert', $log->summaries()[0]);
+    }
+
+    public function testDeactivationAlsoNeedsConfirm(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066, ['enabled' => true]);
+        $store = ThemeBuilderFixtures::store([$template]);
+        $store->shouldReceive('setEnabled')->once()->with(1066, false);
+        $store->shouldReceive('clearCaches')->once();
+
+        $dry = self::ability($store)->execute(self::input($template, false));
+        self::assertToolError($dry, 'confirm_required');
+        self::assertStringContainsString('Deaktivieren', self::clientError($dry)['message']);
+        self::assertSame([], $dry->get_error_data()['overlaps']);
+
+        $result = self::ability($store)->execute(self::input($template, false, true));
+        self::assertTrue($result['ok']);
+        self::assertFalse($result['enabled']);
+        self::assertFalse($result['live']);
+    }
+
+    /** Ruling Q16: an attached, enabled template in the trash is still rendered – the off-switch reaches it. */
+    public function testDeactivatesALiveTemplateInTheTrash(): void
+    {
+        self::givenPosts(['post_status' => 'trash']);
+        $trashed = ThemeBuilderFixtures::template(1066, ['enabled' => true, 'status' => 'trash']);
+        $store = ThemeBuilderFixtures::store([$trashed]);
+        $store->shouldReceive('setEnabled')->once()->with(1066, false);
+        $store->shouldReceive('clearCaches')->once();
+
+        self::assertTrue(self::ability($store)->permission(self::input($trashed, false)));
+        self::assertToolError(self::ability($store)->permission(self::input($trashed, true)), 'not_found');
+        self::assertToolError(self::ability($store)->execute(self::input($trashed, true, true)), 'not_found');
+        $dry = self::ability($store)->execute(self::input($trashed, false));
+        self::assertToolError($dry, 'confirm_required');
+        self::assertStringContainsString('Papierkorb', self::clientError($dry)['message']);
+        self::assertTrue(self::ability($store)->execute(self::input($trashed, false, true))['ok']);
+    }
+
+    /** Ruling Q8/B10: enabling needs published layouts; switching off never does. */
+    public function testActivationNeedsPublishedLayoutsDeactivationDoesNot(): void
+    {
+        self::givenPosts([], ['post_status' => 'trash']);
+        $off = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([$off]);
+        $store->shouldReceive('setEnabled')->never();
+        $refused = self::ability($store, FakeChangeLog::forbidden())->execute(self::input($off, true));
+        self::assertToolError($refused, 'validation_failed');
+        self::assertSame(['layouts.body'], array_keys(self::errorFields($refused)));
+
+        $on = ThemeBuilderFixtures::template(1066, ['enabled' => true]);
+        $store = ThemeBuilderFixtures::store([$on]);
+        $store->shouldReceive('setEnabled')->once()->with(1066, false);
+        $store->shouldReceive('clearCaches');
+        self::assertTrue(self::ability($store)->execute(self::input($on, false, true))['ok']);
+    }
+
+    public function testRefusesTemplatesWithoutConditionsOrDetached(): void
+    {
+        $empty = ThemeBuilderFixtures::template(1066, ['use_on' => []]);
+        $store = ThemeBuilderFixtures::store([$empty]);
+        $store->shouldReceive('setEnabled')->never();
+        self::assertToolError(self::ability($store)->execute(self::input($empty, true, true)), 'validation_failed');
+
+        $detached = ThemeBuilderFixtures::template(1066, ['attached' => false]);
+        $store = ThemeBuilderFixtures::store([], 0, [$detached]);
+        $store->shouldReceive('setEnabled')->never();
+        $refused = self::ability($store)->execute(self::input($detached, true, true));
+        self::assertToolError($refused, 'validation_failed');
+        self::assertStringContainsString('reattach', (string) json_encode(self::errorFields($refused)));
+    }
+
+    public function testNoChangeWhenAlreadyInThatState(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([$template]);
+        $store->shouldReceive('setEnabled')->never();
+
+        $result = self::ability($store, FakeChangeLog::forbidden())->execute(self::input($template, false));
+
+        self::assertStringContainsString('Keine Änderung', $result['summary']);
+        self::assertTrue(self::ability($store)->annotations()['destructive']);
+        self::assertFalse(self::ability($store)->isDirect());
+    }
+
+    public function testMissingEnabledAndTheDefaultTemplateAreRefused(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([ThemeBuilderFixtures::template(1065), $template]);
+        $store->shouldReceive('setEnabled')->never();
+        $input = self::input($template, true, true);
+        unset($input['enabled']);
+
+        self::assertToolError(self::ability($store)->execute($input), 'validation_failed');
+        self::assertToolError(
+            self::ability($store)->execute(self::input(ThemeBuilderFixtures::template(1065), true, true)),
+            'unsupported'
+        );
+    }
+
+    public function testAFailedSwitchIsRolledBack(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([$template]);
+        $calls = [];
+        $store->shouldReceive('setEnabled')->andReturnUsing(static function (int $id, bool $on) use (&$calls): void {
+            $calls[] = $on;
+            if ($on) {
+                throw new RuntimeException('_et_enabled not stored');
+            }
+        });
+        $store->shouldReceive('clearCaches')->never();
+
+        try {
+            self::ability($store, FakeChangeLog::forbidden())->execute(self::input($template, true, true));
+            self::fail('no WriteFailed');
+        } catch (WriteFailed $e) {
+            self::assertTrue($e->rolledBack);
+        }
+        self::assertSame([true, false], $calls);
+    }
+
+    public function testAFailedRollbackIsAPartialWrite(): void
+    {
+        $template = ThemeBuilderFixtures::template(1066);
+        $store = ThemeBuilderFixtures::store([$template]);
+        $store->shouldReceive('setEnabled')->andThrow(new RuntimeException('database gone'));
+        $log = FakeChangeLog::partialsOnly();
+
+        try {
+            self::ability($store, $log)->execute(self::input($template, true, true));
+            self::fail('no WriteFailed');
+        } catch (WriteFailed $e) {
+            self::assertFalse($e->rolledBack);
+        }
+        $log->assertPartials(['ability' => 'lit/tb-activate', 'object_type' => 'et_template', 'object_id' => '1066']);
+    }
+}
@@ -202,4 +202,43 @@ final class ThemeBuilderAccessTest extends TestCase
        self::assertToolError($hidden, 'not_found');
        self::assertSame(self::clientError($missing), self::clientError($hidden));
    }
+
+    /**
+     * Ruling Q16: Divi renders an attached, enabled template whatever its post status (B8) – the off-switch
+     * (offSwitch: true) reaches it in the trash; everything else about it reads like a missing template.
+     */
+    public function testTheOffSwitchReachesALiveTemplateOutsidePublish(): void
+    {
+        $trashed = ThemeBuilderFixtures::template(1066, ['enabled' => true, 'status' => 'trash']);
+        $input = ['template_id' => 1066, 'template_rev' => $trashed->rev()];
+        LibraryFixtures::given([ThemeBuilderFixtures::templatePost(1066, ['post_status' => 'trash'])]);
+        $access = ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([$trashed]));
+
+        self::assertSame($trashed, $access->changeableTemplate($input, true));
+        $missing = $access->changeableTemplate($input);
+        self::assertToolError($missing, 'not_found');
+
+        $notLive = [
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([], 0, [], [$trashed])),
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([
+                ThemeBuilderFixtures::template(1066, ['status' => 'trash']),
+            ])),
+            ThemeBuilderFixtures::access(['theme_builder'], true, ThemeBuilderFixtures::store([$trashed])),
+        ];
+        foreach ($notLive as $index => $other) {
+            $refused = $other->changeableTemplate($input, true);
+            self::assertToolError($refused, 'not_found', (string) $index);
+            self::assertSame(self::clientError($missing), self::clientError($refused), (string) $index);
+        }
+
+        self::assertToolError(
+            ThemeBuilderFixtures::access([], false, ThemeBuilderFixtures::store([$trashed]))->changeableTemplate($input, true),
+            'forbidden'
+        );
+        self::assertToolError(
+            ThemeBuilderFixtures::access([], true, ThemeBuilderFixtures::store([$trashed]))
+                ->changeableTemplate(['template_id' => 1066, 'template_rev' => 'alt'], true),
+            'rev_mismatch'
+        );
+    }
 }