from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime

class BookBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=200, description="Book title")
    author: str = Field(..., min_length=1, max_length=100, description="Book author")
    isbn: str = Field(..., min_length=10, max_length=13, description="Book ISBN")
    publication_year: Optional[int] = Field(None, ge=1000, le=2100, description="Year of publication")
    genre: Optional[str] = Field(None, max_length=50, description="Book genre")
    description: Optional[str] = Field(None, max_length=1000, description="Book description")
    price: int = Field(..., gt=0, description="Book price")
    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": "9780743273565",
                "publication_year": 1925,
                "genre": "Fiction",
                "description": "A story of the fabulously wealthy Jay Gatsby",
                "price": 999,
                "is_available": True
            }
        }

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

    class Config:
        orm_mode = True
        schema_extra = {
            "example": {
                "id": 1,
                "title": "The Great Gatsby",
                "author": "F. Scott Fitzgerald",
                "isbn": "9780743273565",
                "publication_year": 1925,
                "genre": "Fiction",
                "description": "A story of the fabulously wealthy Jay Gatsby",
                "price": 999,
                "is_available": True,
                "created_at": "2023-01-01T00:00:00",
                "updated_at": "2023-01-01T00:00:00"
            }
        }