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app.py

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+import tkinter as tk
+from tkinter import scrolledtext, messagebox
+import json
+import os
+from datetime import datetime
+
+class ChatApplication:
+    def __init__(self, root):
+        self.root = root
+        self.root.title("Chat Interface")
+        self.root.geometry("600x500")
+        self.root.configure(bg="#f0f0f0")
+        
+        self.message_history = []
+        self.history_file = "chat_history.json"
+        
+        self.load_chat_history()
+        self.create_widgets()
+        
+    def create_widgets(self):
+        # Main frame
+        main_frame = tk.Frame(self.root, bg="#f0f0f0")
+        main_frame.pack(fill=tk.BOTH, expand=True, padx=10, pady=10)
+        
+        # Chat display area
+        self.chat_display = scrolledtext.ScrolledText(
+            main_frame,
+            wrap=tk.WORD,
+            width=60,
+            height=20,
+            font=("Arial", 10),
+            state=tk.DISABLED
+        )
+        self.chat_display.pack(fill=tk.BOTH, expand=True, pady=(0, 10))
+        
+        # Input frame
+        input_frame = tk.Frame(main_frame, bg="#f0f0f0")
+        input_frame.pack(fill=tk.X)
+        
+        # User input field
+        self.user_input = tk.Entry(
+            input_frame,
+            font=("Arial", 12),
+            relief=tk.FLAT,
+            bg="white"
+        )
+        self.user_input.pack(side=tk.LEFT, fill=tk.X, expand=True, padx=(0, 5))
+        self.user_input.bind("<Return>", self.send_message)
+        
+        # Send button
+        send_button = tk.Button(
+            input_frame,
+            text="Send",
+            command=self.send_message,
+            bg="#4CAF50",
+            fg="white",
+            font=("Arial", 10, "bold"),
+            relief=tk.FLAT,
+            padx=20
+        )
+        send_button.pack(side=tk.RIGHT)
+        
+        # Load existing messages
+        self.display_messages()
+        
+        # Focus on input field
+        self.user_input.focus_set()
+        
+    def send_message(self, event=None):
+        message = self.user_input.get().strip()
+        if not message:
+            return
+            
+        timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+        message_data = {
+            "timestamp": timestamp,
+            "message": message,
+            "sender": "user"
+        }
+        
+        self.message_history.append(message_data)
+        self.display_message(message_data)
+        self.user_input.delete(0, tk.END)
+        
+        # Simulate bot response (in real app, this would be your AI/chat logic)
+        self.simulate_bot_response(message)
+        
+        self.save_chat_history()
+        
+    def simulate_bot_response(self, user_message):
+        # Simple response simulation - replace with actual AI/chat logic
+        responses = {
+            "hello": "Hello! How can I help you today?",
+            "hi": "Hi there! What can I do for you?",
+            "help": "I'm here to help! What do you need assistance with?",
+            "bye": "Goodbye! Have a great day!"
+        }
+        
+        response = responses.get(user_message.lower(), 
+                               f"I received your message: '{user_message}'. How can I assist you further?")
+        
+        timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+        response_data = {
+            "timestamp": timestamp,
+            "message": response,
+            "sender": "bot"
+        }
+        
+        self.message_history.append(response_data)
+        self.display_message(response_data)
+        self.save_chat_history()
+        
+    def display_message(self, message_data):
+        self.chat_display.config(state=tk.NORMAL)
+        
+        # Configure tags for different senders
+        self.chat_display.tag_configure("user", foreground="blue", justify="right")
+        self.chat_display.tag_configure("bot", foreground="green", justify="left")
+        self.chat_display.tag_configure("timestamp", foreground="gray", font=("Arial", 8))
+        
+        # Insert message with appropriate formatting
+        if message_data["sender"] == "user":
+            self.chat_display.insert(tk.END, f"{message_data['timestamp']}\n", "timestamp")
+            self.chat_display.insert(tk.END, f"You: {message_data['message']}\n\n", "user")
+        else:
+            self.chat_display.insert(tk.END, f"{message_data['timestamp']}\n", "timestamp")
+            self.chat_display.insert(tk.END, f"Bot: {message_data['message']}\n\n", "bot")
+            
+        self.chat_display.config(state=tk.DISABLED)
+        self.chat_display.see(tk.END)
+        
+    def display_messages(self):
+        self.chat_display.config(state=tk.NORMAL)
+        self.chat_display.delete(1.0, tk.END)
+        
+        for message in self.message_history:
+            if message["sender"] == "user":
+                self.chat_display.insert(tk.END, f"{message['timestamp']}\n", "timestamp")
+                self.chat_display.insert(tk.END, f"You: {message['message']}\n\n", "user")
+            else:
+                self.chat_display.insert(tk.END, f"{message['timestamp']}\n", "timestamp")
+                self.chat_display.insert(tk.END, f"Bot: {message['message']}\n\n", "bot")
+                
+        self.chat_display.config(state=tk.DISABLED)
+        self.chat_display.see(tk.END)
+        
+    def load_chat_history(self):
+        try:
+            if os.path.exists(self.history_file):
+                with open(self.history_file, 'r') as f:
+                    self.message_history = json.load(f)
+        except (FileNotFoundError, json.JSONDecodeError):
+            self.message_history = []
+            
+    def save_chat_history(self):
+        try:
+            with open(self.history_file, 'w') as f:
+                json.dump(self.message_history, f, indent=2)
+        except Exception as e:
+            messagebox.showerror("Error", f"Failed to save chat history: {str(e)}")
+
+def main():
+    root = tk.Tk()
+    app = ChatApplication(root)
+    root.mainloop()
+
+if __name__ == "__main__":
+    main()