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


class CategoryBase(BaseModel):
    name: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = Field(None, max_length=500)
    color: Optional[str] = Field(None, regex=r"^#[0-9A-Fa-f]{6}$")


class CategoryCreate(CategoryBase):
    pass


class CategoryUpdate(BaseModel):
    name: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = Field(None, max_length=500)
    color: Optional[str] = Field(None, regex=r"^#[0-9A-Fa-f]{6}$")


class Category(CategoryBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True