Update app.py

app.py

@@ -22,6 +22,52 @@ def chat(message, history):
     history.append((message, reply))
     return history
 
+def chat_handler(message, history):
+    """
+    message: str from textbox
+    history: existing chat history list (list of tuples/lists)
+    Must return: updated history (list of tuples/lists)
+    """
+    history = history or []
+
+    # sanitize input
+    msg = (message or "").strip()
+    if not msg:
+        history.append(("", "Please type a question or command."))
+        return history
+
+    # simple keyword-driven assistant (expand to real LLM later)
+    low = msg.lower()
+    if "hello" in low or "hi" in low:
+        reply = "Hello! 👋 What would you like to build or debug today?"
+    elif "generate" in low or "build" in low:
+        reply = "Tell me the language and a short description (e.g., 'python: web scraper that saves to csv')."
+    elif "fix" in low or "bug" in low:
+        reply = "Paste the code (or error message) and I'll suggest fixes and diagnostics."
+    elif "explain" in low or "what does" in low:
+        reply = "Paste the code you want explained and I'll walk through it step-by-step."
+    else:
+        # fallback behavior — useful when switching to a real model later
+        reply = "I can generate, explain, and fix code. Try commands like: `generate`, `fix`, or `explain`."
+
+    # Append user message and bot reply as a tuple (user, bot)
+    history.append((message, reply))
+    return history
+
+# UI wiring for the Chat tab
+with gr.Tab("Chat"):
+    chatbot = gr.Chatbot(label="Programming Assistant")
+    chat_input = gr.Textbox(label="Ask anything about programming...", placeholder="e.g. 'generate python: http scraper'")
+    send_btn = gr.Button("Send")
+    clear_btn = gr.Button("Clear")
+
+    # Note: the callback must return the updated chat history (single output mapped to chatbot)
+    send_btn.click(chat_handler, inputs=[chat_input, chatbot], outputs=chatbot)
+    # Allow pressing Enter in textbox to send
+    chat_input.submit(chat_handler, inputs=[chat_input, chatbot], outputs=chatbot)
+    # Clear chat: set chatbot to empty list
+    clear_btn.click(lambda: [], None, chatbot, queue=False)
+
 
 # ✅ UI Layout
 with gr.Blocks(title="Synthetic AI Coder") as app: