"""
Chatbot entry point — interactive terminal loop.

Imports the compiled graph from graph.py (which in turn loads all
artifacts and creates the agents). Then starts an infinite loop that:
1. Reads the user input
2. Sends it to the graph as a HumanMessage
3. Prints the response of the last agent

Type 'q', 'quit' or 'exit' to quit.
"""

import os
os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"

from langchain_core.messages import HumanMessage
from utils.config import DEFAULT_THREAD_ID
from graph import app

# Session configuration — the thread_id identifies the conversation
# and lets the MemorySaver keep the history across turns
config = {"configurable": {"thread_id": DEFAULT_THREAD_ID}}

print("\n--- SYSTEM READY ---")
while True:
    try:
        user_input = input("You: ")
        if user_input.lower() in ["q", "quit", "exit"]:
            break
        # Send the message to the graph and get the final state
        result = app.invoke({"messages": [HumanMessage(content=user_input)]}, config=config)
        # The last message in the list is the agent's response
        print(f"Bot: {result['messages'][-1].content}\n")
    except Exception as e:
        print(f"SYSTEM ERROR: {e}")