from pydantic import BaseModel
from typing import Optional, Literal
from datetime import datetime


class VasPaymentBase(BaseModel):
    status: Optional[Literal['pending', 'succeeded', 'failed', 'expired', 'late_paid']] = None

    qr_id: Optional[int] = None
    payment_url: Optional[str] = None
    expire_at: Optional[datetime] = None

    provider_payload: Optional[dict] = None
    
class VasPaymentCreate(BaseModel):
    order_id: str
    provider: Literal['stripe', 'wechat', 'alipay']

class VasPaymentUpdate(VasPaymentBase):
    pass

class VasPaymentOut(VasPaymentBase):
    id: int
    order_id: str

    provider: str
    channel: str

    payment_intent_id: Optional[str]
    external_trade_no: Optional[str]
    
    base_amount: int
    base_currency: str

    amount: int
    currency: str
    random_offset: int
    
    exchange_rate: float  # 注意：仅用于展示，DB 里是 DECIMAL

    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True