Update app.py

app.py

@@ -193,16 +193,16 @@ def validate_pdf(pdf):
     return "الملف صالح للدردشة", True
 
 def upload_pdf(pdf_file):
-    global vectorstore, chain,chathistory  
+    global vectorstore, chathistory  
     chathistory = []
     data = load_pdf(pdf_file)
     vectorstore = prepare_vectorstore(data)
-    chain = create_chain(vectorstore)
+    
     return "تم تحميل الملف بنجاح !", True
 
         
 def chat(user_input):
-    global chain, chathistory 
+    global chathistory, vectorstore
 
    
     prompt = f"""
@@ -211,10 +211,10 @@ def chat(user_input):
            - Your answer directly reflects the content of the document.
            - If the requested information is not available in the document, clearly state that in Arabic.
            - Keep your response concise yet comprehensive, addressing the question fully.
-           - Always respond only in a professional and well-versed Arabic Language.
+           - Respond only in a professional and well-versed Arabic Language.
         Question: {user_input}.
         """
-
+    chain = create_chain(vectorstore)
     response = chain({"question": prompt})
     assistant_response = response["answer"]