from __future__ import annotations


SLASH_COMMAND_MAP: dict[str, str] = {
    "/reset": "清除当前会话上下文，重新开始对话",
    "/history": "查看当前会话的对话历史摘要",
    "/context": "查看当前会话的上下文信息",
    "/summary": "生成当前会话的总结",
    "/help": "显示可用命令列表",
    "/status": "查看 Bot 状态",
}


def extract_command(content: str) -> tuple[str | None, str]:
    stripped = content.strip()
    if not stripped.startswith("/"):
        return None, content

    parts = stripped.split(maxsplit=1)
    command = parts[0].lower()
    args = parts[1] if len(parts) > 1 else ""

    if command in SLASH_COMMAND_MAP:
        return command, args

    return None, content


def get_command_help() -> str:
    lines = ["可用命令："]
    for cmd, desc in SLASH_COMMAND_MAP.items():
        lines.append(f"  {cmd} - {desc}")
    return "\n".join(lines)