from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field


class ItemBase(BaseModel):
    """Base schema for item data."""

    name: str = Field(..., min_length=1, max_length=100, description="The item name")
    description: Optional[str] = Field(None, description="The item description")


class ItemCreate(ItemBase):
    """Schema for creating a new item."""

    pass


class ItemUpdate(BaseModel):
    """Schema for updating an existing item."""

    name: Optional[str] = Field(
        None, min_length=1, max_length=100, description="The item name"
    )
    description: Optional[str] = Field(None, description="The item description")


class ItemInDB(ItemBase):
    """Schema for item as stored in the database."""

    id: int
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class Item(ItemInDB):
    """Schema for item returned to clients."""

    pass