from pydantic import BaseModel
from typing import Optional
from datetime import datetime


class StockReferenciaBase(BaseModel):
    referencia: str
    unidades_disponibles: int = 0


class StockReferenciaCreate(StockReferenciaBase):
    pass


class StockReferenciaUpdate(BaseModel):
    referencia: Optional[str] = None
    unidades_disponibles: Optional[int] = None


class StockReferenciaResponse(StockReferenciaBase):
    id: int
    ultima_actualizacion: datetime
    created_at: datetime
    
    class Config:
        from_attributes = True