from typing import Optional, Union

from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm import Session

from app.db.base import DbOper
from app.db.models.mediaserver import MediaServerItem


class MediaServerOper(DbOper):
    """
    媒体服务器数据管理
    """

    def __init__(
        self,
        db: Optional[Union[Session, AsyncSession]] = None,
    ) -> None:
        """保存调用方提供的同步或异步查询会话。"""
        super().__init__(db)

    @staticmethod
    def __prepare_payload(kwargs: dict) -> dict:
        """
        过滤数据库模型不存在或不应由远端覆盖的字段
        """
        return {
            k: v for k, v in kwargs.items()
            if hasattr(MediaServerItem, k) and k != "id"
        }

    def add(self, **kwargs) -> bool:
        """
        新增媒体服务器数据
        """
        kwargs = self.__prepare_payload(kwargs)
        server = kwargs.get("server")
        item_id = kwargs.get("item_id")
        if not server or not item_id:
            return False
        item = MediaServerItem(**kwargs)
        existing = self._execute_sync_query(
            lambda session: MediaServerItem.get_by_server_itemid(
                session, server, item_id
            )
        )
        if not existing:
            self._stage_create(item)
            return True
        return False

    def upsert(self, **kwargs) -> bool:
        """
        按媒体服务器和条目ID新增或更新数据
        """
        kwargs = self.__prepare_payload(kwargs)
        server = kwargs.get("server")
        item_id = kwargs.get("item_id")
        if not server or not item_id:
            return False

        item = self._execute_sync_query(
            lambda session: MediaServerItem.get_by_server_itemid(
                session, server, item_id
            )
        )
        if item:
            self._stage_update(item, kwargs)
            return False

        self._stage_create(MediaServerItem(**kwargs))
        return True

    def empty(self, server: Optional[str] = None):
        """
        清空媒体服务器数据
        """
        self._execute_sync_write(
            lambda session: MediaServerItem.empty(session, server)
        )

    def delete_stale(self, server: str, sync_time: str) -> int:
        """
        删除本轮同步未更新的旧数据
        """
        return self._execute_sync_write(
            lambda session: MediaServerItem.delete_stale(
                session,
                server,
                sync_time,
            )
        )

    def delete_excluded_servers(self, servers: list[str]) -> int:
        """
        删除未启用或已移除媒体服务器的数据
        """
        return self._execute_sync_write(
            lambda session: MediaServerItem.delete_excluded_servers(
                session,
                servers,
            )
        )

    def exists(self, **kwargs) -> Optional[MediaServerItem]:
        """
        判断媒体服务器数据是否存在
        """
        if kwargs.get("media_source") and kwargs.get("media_id"):
            item = self._execute_sync_query(
                lambda session: MediaServerItem.exist_by_media_identity(
                    session,
                    media_source=kwargs.get("media_source"),
                    media_id=kwargs.get("media_id"),
                    mtype=kwargs.get("mtype"),
                )
            )
        elif kwargs.get("title"):
            # 按标题、类型、年份查
            item = self._execute_sync_query(
                lambda session: MediaServerItem.exists_by_title(
                    session,
                    title=kwargs.get("title"),
                    mtype=kwargs.get("mtype"),
                    year=kwargs.get("year"),
                )
            )
        else:
            return None
        if not item:
            return None

        if kwargs.get("season") is not None:
            # 判断季是否存在
            if not item.seasoninfo:
                return None
            seasoninfo = item.seasoninfo or {}
            if kwargs.get("season") not in seasoninfo.keys():
                return None
        return item

    async def async_exists(self, **kwargs) -> Optional[MediaServerItem]:
        """
        异步判断媒体服务器数据是否存在
        """
        if kwargs.get("media_source") and kwargs.get("media_id"):
            item = await self._execute_async_query(
                lambda session: MediaServerItem.async_exist_by_media_identity(
                    session,
                    media_source=kwargs.get("media_source"),
                    media_id=kwargs.get("media_id"),
                    mtype=kwargs.get("mtype"),
                )
            )
        elif kwargs.get("title"):
            # 按标题、类型、年份查
            item = await self._execute_async_query(
                lambda session: MediaServerItem.async_exists_by_title(
                    session,
                    title=kwargs.get("title"),
                    mtype=kwargs.get("mtype"),
                    year=kwargs.get("year"),
                )
            )
        else:
            return None
        if not item:
            return None

        if kwargs.get("season") is not None:
            # 判断季是否存在
            if not item.seasoninfo:
                return None
            seasoninfo = item.seasoninfo or {}
            if kwargs.get("season") not in seasoninfo.keys():
                return None
        return item

    def get_item_id(self, **kwargs) -> Optional[str]:
        """
        获取媒体服务器数据ID
        """
        item = self.exists(**kwargs)
        if not item:
            return None
        return str(item.item_id)

    async def async_get_item_id(self, **kwargs) -> Optional[str]:
        """
        异步获取媒体服务器数据ID
        """
        item = await self.async_exists(**kwargs)
        if not item:
            return None
        return str(item.item_id)