from pydantic import BaseModel, Field
from typing import Optional

# Base schema
class BookBase(BaseModel):
    title: str = Field(..., description="Book title")
    author: str = Field(..., description="Book author")
    description: Optional[str] = Field(None, description="Book description")
    pages: Optional[int] = Field(None, ge=1, description="Number of pages")
    published_year: Optional[int] = Field(None, ge=1900, le=2023, description="Year of publication")

# Create schema
class BookCreate(BookBase):
    pass

# Response schema
class Book(BookBase):
    class Config:
        orm_mode = True