Update app.py

app.py

@@ -188,6 +188,35 @@ def extract_patent_number(url):
     match = re.search(pattern, url)
     return match.group(1) if match else None
 
+def preview_pdf(pdf_path, scale_factor=0.5):
+    """
+    Generate and display a resized preview of the first page of the PDF.
+    Args:
+        pdf_path (str): Path to the PDF file.
+        scale_factor (float): Factor to reduce the image size (default is 0.5).
+    Returns:
+        str: Path to the resized image preview.
+    """
+    try:
+        # Open the PDF and extract the first page
+        doc = fitz.open(pdf_path)
+        first_page = doc[0]
+        
+        # Apply scaling using a transformation matrix
+        matrix = fitz.Matrix(scale_factor, scale_factor)  # Scale down the image
+        pix = first_page.get_pixmap(matrix=matrix)  # Generate scaled image
+        
+        # Save the preview image
+        temp_image_path = os.path.join(tempfile.gettempdir(), "pdf_preview.png")
+        pix.save(temp_image_path)
+        
+        doc.close()
+        return temp_image_path
+    
+    except Exception as e:
+        st.error(f"Error generating PDF preview: {e}")
+        return None
+
 if __name__ == "__main__":
     st.set_page_config(
         page_title="Patent Chat: Google Patents Chat Demo",