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


class CategoryBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    parent_id: Optional[int] = None
    level: int = Field(default=1, ge=1, le=2)
    icon: Optional[str] = None
    sort_order: int = 0


class CategoryCreate(CategoryBase):
    pass


class CategoryUpdate(BaseModel):
    name: Optional[str] = None
    parent_id: Optional[int] = None
    level: Optional[int] = None
    icon: Optional[str] = None
    sort_order: Optional[int] = None


class CategoryResponse(CategoryBase):
    id: int
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class CategoryWithChildren(CategoryResponse):
    children: List["CategoryResponse"] = []