Update app.py

app.py

@@ -4,21 +4,23 @@ from pdfminer.high_level import extract_text
 
 
 def pdf_to_text(pdf_path):
-    return extract_text(pdf_path)
+    try:
+        return extract_text(pdf_path)
+    except Exception as e:
+        raise ValueError(f"PDF extraction error: {str(e)}")
 
 def generate_lesson(doc_text=None, pdf_file=None):
     try:
+        if pdf_file and doc_text:
+            return "Please provide either a text input or a PDF file, not both.", None
+        
         if pdf_file:
             doc_text = pdf_to_text(pdf_file.name)
         
         processed_text = process_large_text(doc_text)
-
         generated_text, output_path = generate_lesson_from_transcript_logic(processed_text)
 
-        if output_path:
-            return generated_text, gr.File(output_path)
-        else:
-            return generated_text, None
+        return (generated_text, gr.File(output_path)) if output_path else (generated_text, None)
 
     except Exception as e:
         return f"Error occurred: {str(e)}", None