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src/pageLoader.js

@@ -67,8 +67,122 @@ async function hideLogo(page) {
   }
 }
 
+/**
+ * Start smooth auto-scrolling on the page
+ * @param {Page} page - Puppeteer page
+ * @param {Object} options - Scrolling options
+ * @param {number} options.pauseAtTop - Seconds to wait at top before scrolling (default: 30)
+ * @param {number} options.fps - Frame rate for smooth scrolling (default: 30)
+ * @returns {Function} Stop function to cancel scrolling
+ */
+async function startAutoScroll(page, { pauseAtTop = 30, fps = 30 } = {}) {
+  let stopScrolling = false;
+  
+  const stopFunction = () => {
+    stopScrolling = true;
+  };
+  
+  // Inject scrolling logic into the page
+  await page.evaluate((pauseMs, captureFrameRate) => {
+    window.__autoScrollState = {
+      stopScrolling: false,
+      isScrolling: false
+    };
+    
+    function smoothScroll() {
+      if (window.__autoScrollState.stopScrolling) return;
+      
+      const maxScroll = Math.max(
+        document.body.scrollHeight,
+        document.documentElement.scrollHeight
+      ) - window.innerHeight;
+      
+      if (maxScroll <= 0) {
+        // Page is not scrollable, just wait
+        setTimeout(() => {
+          if (!window.__autoScrollState.stopScrolling) {
+            smoothScroll();
+          }
+        }, pauseMs);
+        return;
+      }
+      
+      // Wait at top, then start smooth scroll
+      setTimeout(() => {
+        if (window.__autoScrollState.stopScrolling) return;
+        
+        // Slow scroll speed for smooth appearance
+        // At 60fps with 30px/s = 0.5 pixels per frame
+        const pixelsPerSecond = 30;
+        const pixelsPerFrame = pixelsPerSecond / captureFrameRate;
+        const frameInterval = 1000 / captureFrameRate;
+        
+        function scrollDown() {
+          if (window.__autoScrollState.stopScrolling) return;
+          
+          let currentPos = window.scrollY;
+          
+          const interval = setInterval(() => {
+            if (window.__autoScrollState.stopScrolling) {
+              clearInterval(interval);
+              return;
+            }
+            
+            currentPos += pixelsPerFrame;
+            
+            if (currentPos >= maxScroll) {
+              window.scrollTo(0, maxScroll);
+              clearInterval(interval);
+              setTimeout(() => {
+                if (!window.__autoScrollState.stopScrolling) {
+                  scrollUp();
+                }
+              }, 2000);
+            } else {
+              window.scrollTo(0, currentPos);
+            }
+          }, frameInterval);
+        }
+        
+        function scrollUp() {
+          if (window.__autoScrollState.stopScrolling) return;
+          
+          let currentPos = window.scrollY;
+          
+          const interval = setInterval(() => {
+            if (window.__autoScrollState.stopScrolling) {
+              clearInterval(interval);
+              return;
+            }
+            
+            currentPos -= pixelsPerFrame;
+            
+            if (currentPos <= 0) {
+              window.scrollTo(0, 0);
+              clearInterval(interval);
+              if (!window.__autoScrollState.stopScrolling) {
+                smoothScroll();
+              }
+            } else {
+              window.scrollTo(0, currentPos);
+            }
+          }, frameInterval);
+        }
+        
+        scrollDown();
+      }, pauseMs);
+    }
+    
+    // Start scrolling
+    smoothScroll();
+  }, pauseAtTop * 1000, fps);
+  
+  return stopFunction;
+}
+
 module.exports = {
   setupPage,
   waitForPageFullyLoaded,
-  hideLogo
+  hideLogo,
+  startAutoScroll
 };