ChatResponse

from langchat import ChatResponse

response = await lc.chat(query="Hello", user_id="alice")

if response:
    print("Success!")
else:
    print("Failed.")

response = await lc.chat(query="Hello", user_id="alice")
print(response)          # prints the AI response text

response = await lc.chat(query="What is RAG?", user_id="alice")
print(response)

response = await lc.chat(query="Explain quantum computing", user_id="alice")

if response:
    print(response.text)
    print(f"Answered in {response.response_time:.2f}s")
else:
    # Log the error and show a user-friendly message
    logger.error(f"Chat failed: {response.error}")
    print("Sorry, something went wrong. Please try again.")

from fastapi import FastAPI
from langchat import LangChat, ChatResponse

app = FastAPI()

@app.post("/ask")
async def ask(query: str, user_id: str):
    response: ChatResponse = await lc.chat(query=query, user_id=user_id)
    return {
        "answer": response.text,
        "ok": bool(response),
        "latency": response.response_time,
        "timestamp": response.timestamp,
    }

async def chat_loop(user_id: str):
    while True:
        query = input("You: ")
        if not query.strip():
            continue

        response = await lc.chat(query=query, user_id=user_id)

        if response:
            print(f"Bot: {response.text}")
        else:
            print(f"Error: {response.error}")