from pathlib import Path
from datetime import datetime
from config import settings


def log_turn(session_id: str, user_msg: str, assistant_msg: str) -> None:
    today = datetime.now().strftime("%Y-%m-%d")
    sessions_dir = settings.inara_path() / "sessions"
    sessions_dir.mkdir(exist_ok=True)

    log_file = sessions_dir / f"{today}.md"
    timestamp = datetime.now().strftime("%H:%M")
    is_new = not log_file.exists()

    with open(log_file, "a") as f:
        if is_new:
            f.write(f"# Session Log — {today}\n")
        f.write(
            f"\n### [{timestamp}] `{session_id}`\n"
            f"**{settings.user_name}:** {user_msg}\n\n"
            f"**{settings.agent_name}:** {assistant_msg}\n"
        )