from pydantic import BaseModel, Field
from datetime import datetime

class BookBase(BaseModel):
    title: str = Field(..., description="Book title")
    author: str = Field(..., description="Book author", index=True)
    description: str | None = Field(None, description="Book description")
    page_count: int = Field(..., gt=0, description="Number of pages")
    published_date: datetime = Field(..., description="Publication date")
    isbn: str = Field(..., description="ISBN number", index=True)

    class Config:
        orm_mode = True

class BookCreate(BookBase):
    pass

class BookResponse(BookBase):
    class Config:
        schema_extra = {
            "example": {
                "title": "The Great Gatsby",
                "author": "F. Scott Fitzgerald",
                "description": "A novel about the decadence of the Jazz Age.",
                "page_count": 180,
                "published_date": "1925-04-10T00:00:00",
                "isbn": "978-0743273565"
            }
        }