from datetime import datetime
from typing import List, Optional

from pydantic import BaseModel, Field

from app.schemas.product import Product


# Cart Item schemas
class CartItemBase(BaseModel):
    product_id: int
    quantity: int = Field(1, gt=0)


class CartItemCreate(CartItemBase):
    pass


class CartItemUpdate(BaseModel):
    quantity: int = Field(..., gt=0)


class CartItemInDBBase(CartItemBase):
    id: int
    cart_id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class CartItem(CartItemInDBBase):
    product: Optional[Product] = None


# Cart schemas
class CartBase(BaseModel):
    user_id: int


class CartCreate(CartBase):
    pass


class CartInDBBase(CartBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class Cart(CartInDBBase):
    items: List[CartItem] = []