import os
from typing import Any, Dict, Optional

import yaml


class PromptManager:
    """提示词配置管理器"""

    def __init__(self, config_path: Optional[str] = None):
        root_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
        self._config_path = config_path or os.path.join(root_dir, "config", "prompts.yaml")
        self._data: Dict[str, Any] = {}
        self.reload()

    def reload(self) -> None:
        """重新加载提示词配置"""
        with open(self._config_path, "r", encoding="utf-8") as f:
            self._data = yaml.safe_load(f) or {}

    def get(self, group: str, name: str, default: str = "") -> str:
        """获取指定提示词"""
        return str(self._data.get(group, {}).get(name, default))

    def list_groups(self) -> list[str]:
        """列出所有分组"""
        return list(self._data.keys())

    def list_prompts(self, group: str) -> list[str]:
        """列出分组内提示词"""
        return list(self._data.get(group, {}).keys())


_GLOBAL_PROMPT_MANAGER: Optional[PromptManager] = None


def get_prompt_manager(config_path: Optional[str] = None) -> PromptManager:
    """获取全局 PromptManager（单例）"""
    global _GLOBAL_PROMPT_MANAGER
    if _GLOBAL_PROMPT_MANAGER is None:
        _GLOBAL_PROMPT_MANAGER = PromptManager(config_path=config_path)
    return _GLOBAL_PROMPT_MANAGER