from pydantic import BaseModel, Field
from typing import Optional

class BookBase(BaseModel):
    title: str = Field(..., description="Book title")
    author: str = Field(..., description="Book author")
    isbn: str = Field(..., description="Book ISBN number")
    publication_year: Optional[int] = Field(None, description="Year of publication")
    publisher: Optional[str] = Field(None, description="Book publisher")
    description: Optional[str] = Field(None, description="Book description")
    copies_available: int = Field(default=1, description="Number of copies available")
    is_available: bool = Field(default=True, description="Book availability status")

class BookCreate(BookBase):
    class Config:
        schema_extra = {
            "example": {
                "title": "The Great Gatsby",
                "author": "F. Scott Fitzgerald",
                "isbn": "978-0743273565",
                "publication_year": 1925,
                "publisher": "Charles Scribner's Sons",
                "description": "A story of the fabulously wealthy Jay Gatsby",
                "copies_available": 5,
                "is_available": True
            }
        }

class Book(BookBase):
    id: int = Field(..., description="Book ID")

    class Config:
        orm_mode = True
        schema_extra = {
            "example": {
                "id": 1,
                "title": "The Great Gatsby",
                "author": "F. Scott Fitzgerald",
                "isbn": "978-0743273565",
                "publication_year": 1925,
                "publisher": "Charles Scribner's Sons",
                "description": "A story of the fabulously wealthy Jay Gatsby",
                "copies_available": 5,
                "is_available": True
            }
        }