fix today's lessons tweaking out (#420)

src/seqta/ui/dev/hideSensitiveContent.ts

@@ -3,6 +3,8 @@ interface ElementConfig {
   action: (element: Element) => void;
   /** When true, element is not added to processedElements so the action runs every time (e.g. overwriting container content) */
   alwaysRun?: boolean;
+  /** When true, never add to processedElements so the action can run again after DOM resets (e.g. home day column) */
+  neverMarkProcessed?: boolean;
 }
 
 interface ContentConfig {
@@ -12,6 +14,12 @@ interface ContentConfig {
 // Track processed elements to avoid re-randomizing
 const processedElements = new WeakSet<Element>();
 
+/** Marks mock-generated `.day` rows so granular rules do not re-randomize them */
+const MOCK_DAY_ATTR = "data-bsp-mock-day";
+
+/** Skip MutationObserver-driven reprocessing while we inject the home mock (avoids feedback loops) */
+let suppressMockMutations = false;
+
 function debounce(func: Function, wait: number): Function {
   let timeout: NodeJS.Timeout;
   return function executedFunction(...args: any[]) {
@@ -44,19 +52,19 @@ function getRandomDate(): Date {
 
 const contentConfig: ContentConfig = {
   lessonTitle: {
-    selector: ".day h2",
+    selector: `.day:not([${MOCK_DAY_ATTR}]) h2`,
     action: (element) => {
       element.textContent = getRandomElement(mockData.subjects);
     },
   },
   teacher: {
-    selector: ".day h3:first-of-type",
+    selector: `.day:not([${MOCK_DAY_ATTR}]) h3:first-of-type`,
     action: (element) => {
       element.textContent = getRandomElement(mockData.teachers);
     },
   },
   classroom: {
-    selector: ".day h3:last-of-type",
+    selector: `.day:not([${MOCK_DAY_ATTR}]) h3:last-of-type`,
     action: (element) => {
       element.textContent = getRandomElement(mockData.classrooms);
     },
@@ -283,13 +291,28 @@ const contentConfig: ContentConfig = {
   // Home page: replace entire day with mock schedule (care + 7 lessons 8:55–3:15)
   homeDayContainer: {
     selector: "#day-container",
-    alwaysRun: true,
+    neverMarkProcessed: true,
     action: (element) => {
       const container = element as HTMLElement;
       if (!container.closest(".timetable-container")) return; // only on home
+      if (container.classList.contains("loading") || container.innerHTML.trim() === "") {
+        delete container.dataset.bspMockSchedule;
+        return;
+      }
+      if (
+        container.dataset.bspMockSchedule === "1" &&
+        container.querySelector(`[${MOCK_DAY_ATTR}]`)
+      ) {
+        return;
+      }
+      suppressMockMutations = true;
       const schedule = getMockDaySchedule();
       container.innerHTML = schedule;
       container.classList.remove("loading");
+      container.dataset.bspMockSchedule = "1";
+      requestAnimationFrame(() => {
+        suppressMockMutations = false;
+      });
     },
   },
 };
@@ -665,7 +688,7 @@ function getMockDaySchedule(): string {
   return blocks
     .map(
       (b, i) =>
-        `<div class="day" style="--item-colour: ${colours[i % colours.length]};">
+        `<div class="day" ${MOCK_DAY_ATTR} style="--item-colour: ${colours[i % colours.length]};">
           <h2>${b.title}</h2>
           <h3>${b.teacher}</h3>
           <h3>${b.room}</h3>
@@ -758,12 +781,12 @@ const debouncedProcessElements = debounce(processNewElements, 1);
 
 function processNewElements() {
   Object.entries(contentConfig).forEach(([_, config]) => {
-    const { selector, action, alwaysRun } = config;
+    const { selector, action, alwaysRun, neverMarkProcessed } = config;
     const elements = document.querySelectorAll(selector);
     elements.forEach((element: Element) => {
-      if (alwaysRun || !processedElements.has(element)) {
+      if (alwaysRun || neverMarkProcessed || !processedElements.has(element)) {
         action(element);
-        if (!alwaysRun) {
+        if (!alwaysRun && !neverMarkProcessed) {
           processedElements.add(element);
         }
       }
@@ -772,7 +795,6 @@ function processNewElements() {
 }
 
 let observer: MutationObserver | null = null;
-let intervalId: NodeJS.Timeout | null = null;
 
 export default function hideSensitiveContent() {
   // Initial processing of existing elements
@@ -781,6 +803,8 @@ export default function hideSensitiveContent() {
   // Set up MutationObserver if not already created
   if (!observer) {
     observer = new MutationObserver((mutations) => {
+      if (suppressMockMutations) return;
+
       let shouldProcess = false;
       
       mutations.forEach((mutation) => {
@@ -802,9 +826,25 @@ export default function hideSensitiveContent() {
             });
           }
           
-          // Also trigger on large DOM replacements (like page navigation)
+          // Large DOM replacements (e.g. page navigation). Skip only when #day-container gains many *mock* rows (our inject).
           if (mutation.addedNodes.length > 5 || mutation.removedNodes.length > 5) {
-            shouldProcess = true;
+            const target = mutation.target as Element;
+            if (target.id === "day-container") {
+              for (const node of mutation.addedNodes) {
+                if (node.nodeType === Node.ELEMENT_NODE) {
+                  const el = node as Element;
+                  if (
+                    el.classList?.contains("day") &&
+                    !el.hasAttribute(MOCK_DAY_ATTR)
+                  ) {
+                    shouldProcess = true;
+                    break;
+                  }
+                }
+              }
+            } else {
+              shouldProcess = true;
+            }
           }
         }
         
@@ -833,13 +873,6 @@ export default function hideSensitiveContent() {
       attributeFilter: ['class', 'id'] // Watch for class/id changes that might affect our selectors
     });
   }
-  
-  // Fallback: periodic check for new elements (especially useful for SPA navigation)
-  if (!intervalId) {
-    intervalId = setInterval(() => {
-      debouncedProcessElements();
-    }, 500); // Check every 500ms as a fallback
-  }
 }
 
 // Function to stop observing (useful for cleanup)
@@ -848,8 +881,4 @@ export function stopHidingSensitiveContent() {
     observer.disconnect();
     observer = null;
   }
-  if (intervalId) {
-    clearInterval(intervalId);
-    intervalId = null;
-  }
 }