from collections import defaultdict
from typing import Dict, List
from app.config import config

# { uid: { "text": [...], "stt": [...] } }
_store: Dict[str, Dict[str, List[dict]]] = defaultdict(
    lambda: {"text": [], "stt": []}
)


def get_history(uid: str, channel: str) -> List[dict]:
    return list(_store[uid][channel])


def append_turn(uid: str, channel: str, role: str, content: str) -> None:
    history = _store[uid][channel]
    history.append({"role": role, "content": content})
    max_messages = config.MAX_HISTORY_TURNS * 2
    if len(history) > max_messages:
        _store[uid][channel] = history[-max_messages:]


def clear_session(uid: str) -> None:
    _store.pop(uid, None)