Application file

app.py

@@ -0,0 +1,87 @@
+import os
+import streamlit as st
+from langchain.chains import ConversationChain
+from langchain_openai import ChatOpenAI
+from langchain.memory import ConversationBufferMemory
+from streamlit_extras.add_vertical_space import add_vertical_space
+from streamlit_extras.chat_elements import message
+
+# Set OpenAI API Key
+os.environ["OPENAI_API_KEY"] = ""
+
+# Initialize the chatbot
+@st.cache_resource
+def init_chatbot():
+    memory = ConversationBufferMemory()
+    chatbot = ConversationChain(
+        llm=ChatOpenAI(model="gpt-4o-mini"),
+        memory=memory,
+        verbose=False
+    )
+    return chatbot
+
+chatbot = init_chatbot()
+
+# Custom Styling
+st.markdown("""
+    <style>
+        body {
+            background-color: #f5f5f5;
+        }
+        .chat-container {
+            background-color: #ffffff;
+            padding: 20px;
+            border-radius: 10px;
+            box-shadow: 0px 4px 6px rgba(0,0,0,0.1);
+        }
+    </style>
+""", unsafe_allow_html=True)
+
+# Sidebar - Settings
+st.sidebar.title("⚙️ Settings")
+model_choice = st.sidebar.radio("Select Model", ("gpt-4o-mini", "gpt-4", "gpt-3.5-turbo"))
+
+# Update model based on user selection
+if model_choice:
+    chatbot.llm = ChatOpenAI(model=model_choice)
+
+# Title and Description
+st.title("💬 LangChain AI Chatbot")
+st.write("### Hi, I'm a chatbot built with Langchain powered by GPT. How can I assist you today?")
+
+# Chat history
+if "chat_history" not in st.session_state:
+    st.session_state.chat_history = []
+
+# User Input
+user_input = st.text_input("You:", placeholder="Ask me anything...")
+
+# Process input
+if user_input:
+    with st.spinner("Thinking..."):
+        response = chatbot.run(user_input)
+        st.session_state.chat_history.append(("user", user_input))
+        st.session_state.chat_history.append(("bot", response))
+
+# Display chat history
+st.write("### 🗨️ Conversation")
+chat_container = st.container()
+
+with chat_container:
+    for role, text in st.session_state.chat_history:
+        if role == "user":
+            message(text, is_user=True, avatar_style="thumbs")
+        else:
+            message(text, is_user=False, avatar_style="bottts")
+
+# Add some spacing
+add_vertical_space(2)
+
+# Collapsible Chat History
+with st.expander("📜 Chat History"):
+    for role, text in st.session_state.chat_history:
+        st.write(f"**{role.capitalize()}**: {text}")
+
+# Footer
+st.markdown("---")
+st.markdown("Developed with ❤️ using Streamlit & LangChain")