from pydantic import BaseModel, Field, EmailStr
from typing import List, Literal, Optional

class Product(BaseModel):
    id: str
    name: str
    price_cents: int = Field(..., ge=0, alias="priceCents")
    stock: int = Field(..., ge=0)

class CartItem(BaseModel):
    id: str
    product_id: str = Field(..., alias="productId")
    quantity: int = Field(..., gt=0, le=99)

class Cart(BaseModel):
    user_id: str = Field(..., alias="userId")
    items: List[CartItem] = []

class OrderItem(BaseModel):
    product_id: str = Field(..., alias="productId")
    price_cents: int = Field(..., alias="priceCents")
    quantity: int

class Order(BaseModel):
    id: str
    status: Literal["PENDING_PAYMENT", "PAID"]
    total_cents: int = Field(..., ge=0, alias="totalCents")
    items: List[OrderItem]