# app/services/payment_provider.py

from sqlalchemy.orm import Session
from app.core.biz_exception import NotFoundError, PermissionDeniedError, BizLogicError
from app.models.payment_provider import VasPaymentProvider
from app.schemas.payment_provider import VasPaymentProviderCreate, VasPaymentProviderUpdate

class PaymentProviderSerivce:

    def create(
        db: Session,
        data: VasPaymentProviderCreate
    ) -> VasPaymentProvider:
        # 防止重复注册
        exists = (
            db.query(VasPaymentProvider)
            .filter(
                VasPaymentProvider.name == data.name,
                VasPaymentProvider.channel == data.channel,
                VasPaymentProvider.currency == data.currency,
            )
            .first()
        )

        if exists:
            raise BizLogicError("Payment provider already exists")

        provider = VasPaymentProvider(
            name=data.name,
            channel=data.channel,
            currency=data.currency,
            icon=data.icon,
            enabled=data.enabled if data.enabled is not None else 1,
            config=data.config,
        )

        db.add(provider)
        db.commit()
        db.refresh(provider)
        return provider

    def update(
        db: Session,
        provider_id: int,
        data: VasPaymentProviderUpdate
    ) -> VasPaymentProvider:
        provider = db.query(VasPaymentProvider).get(provider_id)
        if not provider:
            raise BizLogicError("Payment provider not found")

        update_data = data.dict(exclude_unset=True)

        # 安全起见，禁止修改三元组
        for forbidden in ("name", "channel", "currency"):
            update_data.pop(forbidden, None)

        for key, value in update_data.items():
            setattr(provider, key, value)

        db.commit()
        db.refresh(provider)
        return provider
    
    def delete(db: Session, id: int):
        provider = db.query(VasPaymentProvider).filter_by(id=id).first()
        if not provider:
            raise NotFoundError("Provider not exist")
        db.delete(provider)
        db.commit()
    
    def list_all(db: Session):
        return db.query(VasPaymentProvider).all()

    def list_enabled(
        db: Session,
        currency: str = None
    ):
        q = db.query(VasPaymentProvider).filter(
            VasPaymentProvider.enabled == 1
        )

        if currency:
            q = q.filter(VasPaymentProvider.currency == currency)

        return q.all()
    
    def get_by_name(
        db: Session,
        name: str
    ):
        q = db.query(VasPaymentProvider).filter(
            VasPaymentProvider.enabled == 1
        )

        if name:
            q = q.filter(VasPaymentProvider.name == name)

        return q.first()