"""查询下载器工具"""

import json
from typing import Optional, Type

from pydantic import BaseModel, Field

from app.agent.tools.base import MoviePilotTool
from app.agent.tools.tags import ToolTag
from app.db.systemconfig_oper import SystemConfigOper
from app.log import logger
from app.schemas.types import SystemConfigKey


class QueryDownloadersInput(BaseModel):
    """查询下载器工具的输入参数模型"""
    explanation: Optional[str] = Field(None, description="Clear explanation of why this tool is being used in the current context")


class QueryDownloadersTool(MoviePilotTool):
    name: str = "query_downloaders"
    tags: list[str] = [
        ToolTag.Read,
        ToolTag.Download,
    ]
    description: str = (
        "Query downloader configuration and list available downloaders. Non-admin users receive "
        "a safe view with only the fields needed to choose a downloader, without host, account, "
        "password, token or API key values."
    )
    args_schema: Type[BaseModel] = QueryDownloadersInput

    def get_tool_message(self, **kwargs) -> Optional[str]:
        """生成友好的提示消息"""
        return "查询下载器配置"

    @staticmethod
    def _load_downloaders_config():
        """从内存配置缓存中读取下载器配置。"""
        return SystemConfigOper().get(SystemConfigKey.Downloaders)

    @staticmethod
    def _sanitize_downloaders_config(downloaders_config: list) -> list:
        """
        生成普通用户可见的下载器配置视图。

        :param downloaders_config: 系统下载器完整配置列表
        :return: 仅包含名称、类型和启用状态的安全配置列表
        """
        safe_fields = ("name", "type", "enabled", "default", "priority")
        safe_downloaders = []
        for downloader in downloaders_config:
            if not isinstance(downloader, dict):
                continue
            safe_downloaders.append({
                key: downloader.get(key)
                for key in safe_fields
                if key in downloader
            })
        return safe_downloaders

    async def run(self, **kwargs) -> str:
        logger.info(f"执行工具: {self.name}")
        try:
            downloaders_config = self._load_downloaders_config()
            if downloaders_config:
                if not await self.is_admin_user():
                    downloaders_config = self._sanitize_downloaders_config(
                        downloaders_config
                    )
                return json.dumps(downloaders_config, ensure_ascii=False, indent=2)
            return "未配置下载器。"
        except Exception as e:
            logger.error(f"查询下载器失败: {e}")
            return f"查询下载器时发生错误: {str(e)}"