"""Thread-safe in-memory store for the last Claude response per channel.

Router.py updates this after every Claude response; fast_commands.cmd_audio
reads from it when /audio is called without arguments.
"""

import threading

_lock = threading.Lock()
_store: dict[str, str] = {}  # channel_id → last response text


def set_last(channel_id: str, text: str) -> None:
    """Store the most recent Claude response for a channel."""
    if not channel_id or not text:
        return
    with _lock:
        _store[channel_id] = text


def get_last(channel_id: str) -> str | None:
    """Return the last stored response for a channel, or None if missing."""
    if not channel_id:
        return None
    with _lock:
        return _store.get(channel_id)