from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Boolean
from sqlalchemy.orm import relationship

from app.db.session import Base
from app.models.tag import post_tag


class Post(Base):
    __tablename__ = "posts"

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String(255), nullable=False)
    content = Column(Text, nullable=False)
    published = Column(Boolean, default=True)
    author_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    
    # Relationships
    author = relationship("User", back_populates="posts")
    comments = relationship("Comment", back_populates="post", cascade="all, delete-orphan")
    tags = relationship("Tag", secondary=post_tag, back_populates="posts")