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app.py

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+import streamlit as st
+import random
+import time
+
+# Page config
+st.set_page_config(page_title="StreamChat", page_icon="🤖")
+
+# Initialize session state
+if "messages" not in st.session_state:
+    st.session_state.messages = []
+if "thinking" not in st.session_state:
+    st.session_state.thinking = False
+
+# Helper: mock LLM response
+def mock_llm(prompt: str) -> str:
+    time.sleep(1.2)  # Simulate latency
+    replies = [
+        f"Interesting point! Re: '{prompt}' — I'd say let's explore this further.",
+        f"Thanks for sharing '{prompt}'. From my perspective, that seems spot on.",
+        f"Ah, '{prompt}' — reminds me of something I read in the docs.",
+        f"'{prompt}'... 🤔 Let me ponder that for a moment.",
+    ]
+    return random.choice(replies)
+
+# Sidebar
+with st.sidebar:
+    st.title("🤖 StreamChat")
+    st.markdown("A lightweight Streamlit chatbot demo.")
+    if st.button("Clear History"):
+        st.session_state.messages.clear()
+        st.rerun()
+
+# Display chat messages
+for msg in st.session_state.messages:
+    with st.chat_message(msg["role"]):
+        st.markdown(msg["content"])
+
+# User input
+if prompt := st.chat_input("Ask me anything...", disabled=st.session_state.thinking):
+    # Add user message
+    st.session_state.messages.append({"role": "user", "content": prompt})
+    st.session_state.thinking = True
+    st.rerun()
+
+# If thinking, generate response
+if st.session_state.thinking:
+    last_user = st.session_state.messages[-1]["content"]
+    with st.chat_message("assistant"):
+        with st.spinner("Thinking..."):
+            response = mock_llm(last_user)
+        st.markdown(response)
+    st.session_state.messages.append({"role": "assistant", "content": response})
+    st.session_state.thinking = False
+    st.rerun()