from pydantic import BaseModel, Field
from typing import Optional

class BookBase(BaseModel):
    title: str = Field(..., min_length=1, description="Book title")
    author: str = Field(..., min_length=1, description="Book author")
    description: Optional[str] = Field(None, description="Book description")
    isbn: str = Field(..., description="Book ISBN number")
    price: int = Field(..., gt=0, description="Book price")
    quantity: int = Field(0, ge=0, description="Available quantity")
    is_available: bool = Field(True, description="Book availability status")

class BookCreate(BookBase):
    class Config:
        schema_extra = {
            "example": {
                "title": "The Great Gatsby",
                "author": "F. Scott Fitzgerald",
                "description": "A story of decadence and excess",
                "isbn": "978-0743273565",
                "price": 999,
                "quantity": 50,
                "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",
                "description": "A story of decadence and excess",
                "isbn": "978-0743273565",
                "price": 999,
                "quantity": 50,
                "is_available": True
            }
        }