# app/services/configuration_service.py

from typing import List, Optional

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.biz_exception import NotFoundError, BizLogicError
from app.models.configuration import Configuration
from app.schemas.configuration import ConfigurationCreate, ConfigurationUpdate


class ConfigurationService:

    # =========================
    # 创建配置
    # =========================
    @staticmethod
    async def create(
        db: AsyncSession,
        config_in: ConfigurationCreate,
    ) -> Configuration:
        stmt = select(Configuration).where(
            Configuration.config_key == config_in.config_key
        )
        existing = (await db.execute(stmt)).scalar_one_or_none()
        if existing:
            raise BizLogicError(
                f"Config Key '{config_in.config_key}' already exist"
            )

        db_obj = Configuration(**config_in.dict())
        db.add(db_obj)
        await db.commit()
        await db.refresh(db_obj)
        return db_obj

    # =========================
    # 获取全部配置
    # =========================
    @staticmethod
    async def get_all(
        db: AsyncSession,
    ) -> List[Configuration]:
        stmt = select(Configuration).order_by(Configuration.id.desc())
        result = await db.execute(stmt)
        return result.scalars().all()

    # =========================
    # 根据 key 获取配置
    # =========================
    @staticmethod
    async def get_by_key(
        db: AsyncSession,
        config_key: str,
    ) -> Configuration:
        stmt = select(Configuration).where(
            Configuration.config_key == config_key
        )
        config = (await db.execute(stmt)).scalar_one_or_none()
        if not config:
            raise NotFoundError(
                f"Config Key '{config_key}' not exist"
            )
        return config

    # =========================
    # 根据 key 更新配置
    # =========================
    @staticmethod
    async def update_by_key(
        db: AsyncSession,
        config_key: str,
        config_in: ConfigurationUpdate,
    ) -> Configuration:
        stmt = select(Configuration).where(
            Configuration.config_key == config_key
        )
        db_obj = (await db.execute(stmt)).scalar_one_or_none()
        if not db_obj:
            raise NotFoundError(
                f"Config Key '{config_key}' not exist"
            )

        for field, value in config_in.dict(exclude_unset=True).items():
            setattr(db_obj, field, value)

        await db.commit()
        await db.refresh(db_obj)
        return db_obj

    # =========================
    # 根据 key 删除配置
    # =========================
    @staticmethod
    async def delete_by_key(
        db: AsyncSession,
        config_key: str,
    ) -> Configuration:
        stmt = select(Configuration).where(
            Configuration.config_key == config_key
        )
        db_obj = (await db.execute(stmt)).scalar_one_or_none()
        if not db_obj:
            raise NotFoundError(
                f"Config Key '{config_key}' not exist"
            )

        await db.delete(db_obj)
        await db.commit()
        return db_obj