from pydantic import BaseModel, Field
from typing import Optional, List
from datetime import datetime

class CategoryBase(BaseModel):
    parent_code: str = Field(default="", description="父分类编码，空为顶级分类", max_length=100)
    code: str = Field(default="", description="分类编码，级联编码格式", max_length=100)
    name: str = Field(default="", description="分类名称", max_length=100)
    sort_order: int = Field(default=0, description="排序顺序")
    status: int = Field(default=1, description="状态：0-禁用，1-启用")
    company_code: str = Field(default="", description="公司编码", max_length=50)

class CategoryCreate(CategoryBase):
    pass

class CategoryUpdate(BaseModel):
    parent_code: Optional[str] = None
    code: Optional[str] = None
    name: Optional[str] = None
    sort_order: Optional[int] = None
    status: Optional[int] = None

class CategoryResponse(CategoryBase):
    id: int
    created_at: datetime
    updated_at: datetime
    product_count: Optional[int] = 0
    
    class Config:
        from_attributes = True

class CategoryTreeResponse(CategoryResponse):
    children: List['CategoryTreeResponse'] = []
    
    class Config:
        from_attributes = True

CategoryTreeResponse.model_rebuild()