"""Command‑line interface for the FAQ‑bot.

Examples:
    python cli.py --question "What topics are covered in week 3?"
    python cli.py --question "What is the course schedule?"

If no question is supplied, an interactive prompt is started.
"""

import argparse
import asyncio

from .agent import create_agent_executor

async def main():
    parser = argparse.ArgumentParser(description="FAQ‑bot CLI")
    parser.add_argument("--question", type=str, help="Question to ask the bot")
    args = parser.parse_args()

    executor = await create_agent_executor()

    if args.question:
        state = {"input": args.question}
        result = await executor.ainvoke(state)
        print("\nAnswer:")
        print(result["answer"])
        print(f"\nSource: {result['source']}")
    else:
        print("Enter a question (Ctrl‑D to exit):")
        while True:
            try:
                q = input("> ")
            except EOFError:
                break
            if not q.strip():
                continue
            state = {"input": q}
            result = await executor.ainvoke(state)
            print("\nAnswer:")
            print(result["answer"])
            print(f"\nSource: {result['source']}")
            print("\n---")

if __name__ == "__main__":
    asyncio.run(main())