Release v1.5.12

src/web/routes/admin/content.js

@@ -104,6 +104,55 @@ module.exports = function registerAdminContentRoutes(app, deps) {
     }
   }
 
+  async function fetchTemplateSlideCount(templateId) {
+    const [rows] = await pool.query('SELECT COUNT(*) AS slide_count FROM slides WHERE template_id = ?', [templateId]);
+    return Number(rows[0] && rows[0].slide_count) || 0;
+  }
+
+  async function fetchTemplateRegionUsage(template) {
+    const [slides] = await pool.query('SELECT content_json FROM slides WHERE template_id = ?', [template.id]);
+    const usage = new Set();
+    const regionKeys = new Set((Array.isArray(template && template.regions) ? template.regions : [])
+      .map((region) => String(region && region.region_key || '').trim())
+      .filter(Boolean));
+
+    if (!regionKeys.size || !slides.length) {
+      return [];
+    }
+
+    slides.forEach((slide) => {
+      const content = typeof common.parseJsonSafe === 'function' ? common.parseJsonSafe(slide.content_json) : null;
+      if (!content || typeof content !== 'object') {
+        return;
+      }
+      regionKeys.forEach((regionKey) => {
+        if (Object.prototype.hasOwnProperty.call(content, regionKey)) {
+          usage.add(regionKey);
+        }
+      });
+    });
+
+    return Array.from(usage);
+  }
+
+  function getRemovedTemplateRegionKeys(existingRegions, nextRegions) {
+    const nextKeys = new Set((Array.isArray(nextRegions) ? nextRegions : []).map((region) => String(region && region.region_key || '').trim()).filter(Boolean));
+    return (Array.isArray(existingRegions) ? existingRegions : [])
+      .map((region) => String(region && region.region_key || '').trim())
+      .filter((regionKey) => regionKey && !nextKeys.has(regionKey));
+  }
+
+  async function getTemplateRegionDeleteBlockMessage(template, nextRegions) {
+    const removedRegionKeys = getRemovedTemplateRegionKeys(template && template.regions ? template.regions : [], nextRegions);
+    if (!removedRegionKeys.length) {
+      return '';
+    }
+
+    const usedRegionKeys = Array.isArray(template && template.region_usage) ? template.region_usage : [];
+    const blockedKeys = removedRegionKeys.filter((regionKey) => usedRegionKeys.includes(regionKey));
+    return blockedKeys.length > 0 ? 'This region is still used by one or more slides.' : '';
+  }
+
   function queueSlideThumbnailRefresh(slideId, previousThumbnailPath) {
     if (!backgroundTaskQueue || typeof backgroundTaskQueue.enqueueTask !== 'function') {
       return Promise.resolve(null);
@@ -423,6 +472,7 @@ module.exports = function registerAdminContentRoutes(app, deps) {
       if (!template) {
         return res.status(404).send('Template not found');
       }
+      template.region_usage = await fetchTemplateRegionUsage(template);
       const sizeData = await common.fetchCanvasSizesData(pool);
       res.send(pages.renderTemplateFormPage(template, 'edit', req.query.message ? String(req.query.message) : '', sizeData.canvasSizes, req.currentUser));
     } catch (error) {
@@ -436,11 +486,16 @@ module.exports = function registerAdminContentRoutes(app, deps) {
       if (!template) {
         return res.status(404).send('Template not found');
       }
+      template.region_usage = await fetchTemplateRegionUsage(template);
       const existingUploadRefs = collectUploadReferencesFromTemplate(template);
       const payload = await common.buildTemplatePayload(pool, req, template);
       if (await common.fetchDuplicateName(pool, 'slide_templates', payload.name, template.id)) {
         return res.redirect('/templates/' + template.id + '/edit?message=' + encodeURIComponent('A template with that name already exists.'));
       }
+      const regionDeleteBlockMessage = await getTemplateRegionDeleteBlockMessage(template, payload.regions);
+      if (regionDeleteBlockMessage) {
+        return res.redirect('/templates/' + template.id + '/edit?message=' + encodeURIComponent(regionDeleteBlockMessage));
+      }
       const nextUploadRefs = collectUploadReferencesFromPayload(payload);
       const affectedScreens = await fetchScreensByTemplateId(pool, template.id);
       const actorId = getAuditUserId(req);