"""
deploy/history.py — 单会话对话历史管理

简化版：只维护一个 diagnosis 会话（不再有 per-tab 历史）。
"""

MAX_HISTORY_TURNS = 10
_history: list[dict] = []


def get_history() -> list[dict]:
    """Get conversation history, truncated to MAX_HISTORY_TURNS."""
    if len(_history) > MAX_HISTORY_TURNS * 2:
        return _history[-(MAX_HISTORY_TURNS * 2):]
    return list(_history)


def append_to_history(user_msg: dict, assistant_msg: dict):
    """Append a turn (user + assistant) to history."""
    _history.append(user_msg)
    _history.append(assistant_msg)


def clear_history():
    """Clear all conversation history."""
    _history.clear()