Adding streamlit chatbot

streamlit-chatbot/streamlit-chatbot.py

@@ -0,0 +1,47 @@
+from dotenv import load_dotenv
+from datetime import datetime
+import streamlit as st
+import json
+import os
+
+from langchain_openai import ChatOpenAI
+from langchain_core.messages import AIMessage, SystemMessage, HumanMessage, ToolMessage
+
+load_dotenv()
+
+model = os.getenv('LLM_MODEL', 'gpt-4o')
+
+def main():
+    st.title("Streamlit Chatbot")
+
+    # Initialize the chat history with the initial system message
+    if "messages" not in st.session_state:
+        st.session_state.messages = [
+            SystemMessage(content=f"The current date is: {datetime.now().date()}")
+        ]  
+
+    # Display chat messages from history each time the script is rerun when the UI state changes
+    for message in st.session_state.messages:
+        message_json = json.loads(message.json())
+        with st.chat_message(message_json["type"]):
+            st.markdown(message_json["content"])        
+
+    # Assign prompt to the user input if any is given, otherwise skip everything in this if statement
+    if prompt := st.chat_input("What would you like to do today?"):
+        # Display user message in chat message container
+        st.chat_message("user").markdown(prompt)
+
+        # Add the user message to chat history
+        st.session_state.messages.append(HumanMessage(content=prompt))
+
+        # Display the chatbot's response in chat message container
+        with st.chat_message("assistant"):
+            chatbot = ChatOpenAI(model=model)
+            stream = chatbot.stream(st.session_state.messages)
+            response = st.write_stream(stream)
+
+        st.session_state.messages.append(AIMessage(content=response))
+
+
+if __name__ == "__main__":
+    main()