from sqlalchemy import Column, String, Integer, DateTime, ForeignKey
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from sqlalchemy.dialects.postgresql import UUID
from core.database import Base
import uuid

class Book(Base):
    __tablename__ = "books"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title = Column(String, nullable=False)
    author = Column(String, nullable=False)
    description = Column(String, nullable=True)
    publisher = Column(String, nullable=True)
    publication_year = Column(Integer, nullable=True)
    isbn = Column(String, unique=True, index=True, nullable=False)
    pages = Column(Integer, nullable=True)
    language = Column(String, nullable=True)
    created_at = Column(DateTime, default=func.now())
    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())

    # Relationships if needed
    # category_id = Column(UUID(as_uuid=True), ForeignKey('categories.id'), nullable=True)
    # category = relationship("Category", back_populates="books")