"""Pydantic schemas - 商品管理"""
from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime


class ProductUnitBase(BaseModel):
    """商品单位基础字段"""
    name: str = Field(..., max_length=50)
    code: str = Field(..., max_length=20)


class ProductUnitCreate(ProductUnitBase):
    """创建商品单位请求"""
    pass


class ProductUnitResponse(ProductUnitBase):
    """商品单位响应"""
    id: int
    is_active: bool
    created_at: datetime

    class Config:
        from_attributes = True


class ProductCategoryBase(BaseModel):
    """商品分类基础字段"""
    name: str = Field(..., max_length=100)
    parent_id: Optional[int] = None
    sort_order: int = 0


class ProductCategoryCreate(ProductCategoryBase):
    """创建商品分类请求"""
    pass


class ProductCategoryResponse(ProductCategoryBase):
    """商品分类响应"""
    id: int
    is_active: bool
    created_at: datetime

    class Config:
        from_attributes = True


class ProductBase(BaseModel):
    """商品基础字段"""
    name: str = Field(..., max_length=200)
    category_id: Optional[int] = None
    unit_id: Optional[int] = None
    description: Optional[str] = None
    image_url: Optional[str] = None


class ProductCreate(ProductBase):
    """创建商品请求"""
    pass


class ProductUpdate(BaseModel):
    """更新商品请求"""
    name: Optional[str] = None
    category_id: Optional[int] = None
    unit_id: Optional[int] = None
    description: Optional[str] = None
    image_url: Optional[str] = None
    is_active: Optional[bool] = None


class ProductResponse(ProductBase):
    """商品响应"""
    id: int
    is_active: bool
    created_at: datetime
    unit: Optional[ProductUnitResponse] = None

    class Config:
        from_attributes = True