"""项目分类 Schema"""

from typing import Optional, List
from datetime import datetime

from pydantic import BaseModel, Field


class CategoryBase(BaseModel):
    """分类基础字段"""
    
    category_name: str = Field(..., min_length=1, max_length=50, description="分类名称")
    parent_id: Optional[int] = Field(None, description="父分类ID")
    sort_order: int = Field(0, ge=0, description="排序")
    is_active: bool = Field(True, description="是否启用")


class CategoryCreate(CategoryBase):
    """创建分类请求"""
    pass


class CategoryUpdate(BaseModel):
    """更新分类请求"""
    
    category_name: Optional[str] = Field(None, min_length=1, max_length=50, description="分类名称")
    parent_id: Optional[int] = Field(None, description="父分类ID")
    sort_order: Optional[int] = Field(None, ge=0, description="排序")
    is_active: Optional[bool] = Field(None, description="是否启用")


class CategoryResponse(CategoryBase):
    """分类响应"""
    
    id: int
    created_at: datetime
    updated_at: datetime
    
    class Config:
        from_attributes = True


class CategoryTreeResponse(CategoryResponse):
    """分类树形响应"""
    
    children: List["CategoryTreeResponse"] = []
    
    class Config:
        from_attributes = True


# 解决循环引用
CategoryTreeResponse.model_rebuild()