Upload app.py

src/app.py

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+import streamlit as st
+from rag_chain import get_rag_chain
+
+st.set_page_config(page_title="Cricket Chat", page_icon="🏏")
+st.title("YouTube Video Chatbot")
+
+video_id = st.text_input("Enter YouTube video ID (e.g. Gfr50f6ZBvo)")
+
+if video_id and st.session_state.get("current_video") != video_id:
+    with st.spinner("Processing transcript..."):
+        try:
+            st.session_state.chain = get_rag_chain(video_id)
+            st.session_state.current_video = video_id
+            st.session_state.messages = []
+            st.success("Ready! Ask away.")
+        except ValueError as e:
+            st.error(str(e))
+            st.stop()
+
+if "messages" not in st.session_state:
+    st.session_state.messages = []
+
+for msg in st.session_state.messages:
+    with st.chat_message(msg["role"]):
+        st.markdown(msg["content"])
+
+if "chain" in st.session_state:
+    if prompt := st.chat_input("Ask about the video..."):
+        st.session_state.messages.append({"role": "user", "content": prompt})
+        with st.chat_message("user"):
+            st.markdown(prompt)
+
+        with st.chat_message("assistant"):
+            with st.spinner("Thinking..."):
+                response = st.session_state.chain.invoke(prompt)
+            st.markdown(response)
+            st.session_state.messages.append({"role": "assistant", "content": response})