from sqlalchemy import Column, Text, Integer, String, DateTime, ForeignKey
from db.models import Base
import datetime


class MarkdownPatch(Base):
    """A markdown 'patch card' attached to a parent markdown document.

    Its content is plain markdown text rendered below the parent's body.
    Created/updated by admin|creator, deleted by admin; visibility is
    inherited from the parent markdown (enforced in the API layer).
    """
    __tablename__ = 'markdown_patch'
    id = Column(Integer, primary_key=True)
    markdown_id = Column(
        Integer, ForeignKey('markdown.id'), nullable=False, index=True
    )
    title = Column(String(255), nullable=True)
    content = Column(Text, nullable=False)
    order = Column(Integer, default=0)
    created_at = Column(DateTime, default=lambda: datetime.datetime.now(datetime.UTC))
    updated_at = Column(
        DateTime,
        default=lambda: datetime.datetime.now(datetime.UTC),
        onupdate=lambda: datetime.datetime.now(datetime.UTC),
    )

    def to_dict(self):
        return {
            'id': self.id,
            'markdown_id': self.markdown_id,
            'title': self.title,
            'content': self.content,
            'order': self.order,
            'created_at': self.created_at,
            'updated_at': self.updated_at,
        }