Update app.py

app.py

@@ -200,8 +200,8 @@ def validate_pdf(pdf):
     return "الملف صالح للدردشة", True
 
 def upload_pdf(pdf_file):
-    global vectorstore, chain,chat_history  # Use global variables to store state
-    chat_history = []
+    global vectorstore, chain,chathistory  
+    chathistory = []
     data = load_pdf(pdf_file)
     vectorstore = prepare_vectorstore(data)
     chain = create_chain(vectorstore)
@@ -209,7 +209,7 @@ def upload_pdf(pdf_file):
 
 
 def chat(user_input):
-    global chain chat_history # Access the global chain variable
+    global chain chathistory 
 
     chat_history.append({"role": "user", "content": user_input})
    
@@ -226,7 +226,7 @@ def chat(user_input):
     response = chain({"question": prompt})
     assistant_response = response["answer"]
 
-    chat_history.append({"role": "assistant", "content": assistant_response})
+    chathistory.append({"role": "assistant", "content": assistant_response})
     # Generate a unique identifier for the audio file
     audio_id = str(uuid.uuid4())
 
@@ -235,7 +235,7 @@ def chat(user_input):
     audio_file = f"{audio_id}.mp3"
     tts.save(audio_file)
 
-    history_display = [(h["role"], h["content"]) for h in chat_history]
+    history_display = [(h["role"], h["content"]) for h in chathistory]
     return history_display, audio_file
 
 with gr.Blocks(css=custom_css) as demo: