from pydantic import BaseModel
from datetime import datetime
from typing import Optional
from app.schemas.category import Category
from app.schemas.supplier import Supplier


class ItemBase(BaseModel):
    name: str
    description: Optional[str] = None
    sku: str
    barcode: Optional[str] = None
    unit_price: float
    cost_price: Optional[float] = None
    quantity_in_stock: int = 0
    minimum_stock_level: int = 0
    maximum_stock_level: Optional[int] = None
    reorder_point: int = 0
    is_active: bool = True
    category_id: Optional[int] = None
    supplier_id: Optional[int] = None


class ItemCreate(ItemBase):
    pass


class ItemUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    sku: Optional[str] = None
    barcode: Optional[str] = None
    unit_price: Optional[float] = None
    cost_price: Optional[float] = None
    quantity_in_stock: Optional[int] = None
    minimum_stock_level: Optional[int] = None
    maximum_stock_level: Optional[int] = None
    reorder_point: Optional[int] = None
    is_active: Optional[bool] = None
    category_id: Optional[int] = None
    supplier_id: Optional[int] = None


class Item(ItemBase):
    id: int
    created_at: datetime
    updated_at: datetime
    category: Optional[Category] = None
    supplier: Optional[Supplier] = None

    class Config:
        from_attributes = True


class ItemWithLowStock(BaseModel):
    id: int
    name: str
    sku: str
    quantity_in_stock: int
    minimum_stock_level: int
    reorder_point: int

    class Config:
        from_attributes = True