from __future__ import annotations
from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, JSON
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.database import Base


class GuideConfig(Base):
    __tablename__ = "guide_config"

    id = Column(Integer, primary_key=True, autoincrement=True)
    page_intro = Column(Text)
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

    sections = relationship("GuideSection", back_populates="config", cascade="all, delete-orphan", order_by="GuideSection.sort_order")


class GuideSection(Base):
    """Each section has unique nested structure, stored as JSON columns."""
    __tablename__ = "guide_sections"

    id = Column(Integer, primary_key=True, autoincrement=True)
    config_id = Column(Integer, ForeignKey("guide_config.id", ondelete="CASCADE"), nullable=False)
    section_id = Column(String(50), unique=True, nullable=False)
    title = Column(String(200))
    subtitle = Column(String(500))
    icon = Column(String(10))
    content = Column(Text)
    # Flexible JSON columns for varied section structures
    data = Column(JSON)
    sort_order = Column(Integer, default=0)

    config = relationship("GuideConfig", back_populates="sections")