Update app.py

app.py

@@ -1,37 +1,77 @@
 import streamlit as st
-import time
+import json
 
-# App layout
+def load_contacts():
+    """Load contacts from a JSON file."""
+    try:
+        with open("contacts.json", "r") as f:
+            return json.load(f)
+    except FileNotFoundError:
+        return {}
+
+def save_contacts(contacts):
+    """Save contacts to a JSON file."""
+    with open("contacts.json", "w") as f:
+        json.dump(contacts, f)
+
+# Load existing contacts
+contacts = load_contacts()
+
+# Streamlit app configuration
 st.set_page_config(page_title="Chat App", layout="wide")
+
 st.title("Chat App")
-st.markdown("This is a simple chat application similar to WhatsApp.")
 
-# Initialize session state to store chat messages
-if "messages" not in st.session_state:
-    st.session_state.messages = []
+# Sidebar: Add Contact Section
+st.sidebar.header("Add a New Contact")
+with st.sidebar.form("add_contact_form"):
+    contact_name = st.text_input("Contact Name")
+    contact_number = st.text_input("Phone Number")
+    submit_contact = st.form_submit_button("Add Contact")
 
-# Function to display chat messages
-def display_messages():
-    for message in st.session_state.messages:
-        if message["user"] == "You":
-            st.markdown(f"**You:** {message['text']}")
+    if submit_contact:
+        if contact_name and contact_number:
+            contacts[contact_name] = {"number": contact_number, "messages": []}
+            save_contacts(contacts)
+            st.sidebar.success(f"Contact '{contact_name}' added successfully!")
         else:
-            st.markdown(f"**Friend:** {message['text']}")
+            st.sidebar.error("Please provide both name and number.")
+
+# Main Section: Chat Functionality
+st.header("Chat with Your Contacts")
+
+selected_contact = st.selectbox(
+    "Select a contact to chat with", options=["Select"] + list(contacts.keys())
+)
+
+if selected_contact != "Select":
+    contact_data = contacts[selected_contact]
+
+    st.subheader(f"Chat with {selected_contact}")
 
-# Input area
-with st.form(key="chat_form"):
-    user_input = st.text_input("Enter your message:", "")
-    submitted = st.form_submit_button("Send")
+    # Display chat history
+    chat_history = st.empty()
+    if contact_data["messages"]:
+        chat_history.write("\n".join(contact_data["messages"]))
 
-# Handle message submission
-if submitted and user_input.strip():
-    # Append user message
-    st.session_state.messages.append({"user": "You", "text": user_input})
+    # Input message section
+    with st.form("send_message_form"):
+        message = st.text_input("Type your message")
+        send_message = st.form_submit_button("Send")
 
-    # Simulate a friend response after a short delay
-    time.sleep(1)
-    friend_response = f"I received: {user_input}"
-    st.session_state.messages.append({"user": "Friend", "text": friend_response})
+        if send_message:
+            if message.strip():
+                contact_data["messages"].append(f"You: {message}")
+                save_contacts(contacts)
+                chat_history.write("\n".join(contact_data["messages"]))
+            else:
+                st.error("Message cannot be empty.")
 
-# Display chat messages
-display_messages()
+# Footer
+st.sidebar.markdown("---")
+st.sidebar.markdown("### Instructions")
+st.sidebar.markdown(
+    "1. Use the sidebar to add new contacts.\n"
+    "2. Select a contact from the dropdown to start chatting.\n"
+    "3. Your chat history is saved locally."
+)