# models/database/content_page.py
"""
Content Page Model

Manages static content pages (About, FAQ, Contact, Shipping, Returns, etc.)
with platform-level defaults and vendor-specific overrides.

Features:
- Platform-level default content
- Vendor-specific overrides
- Rich text content (HTML/Markdown)
- SEO metadata
- Published/Draft status
- Version history support
"""

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

from app.core.database import Base


class ContentPage(Base):
    """
    Content pages for shops (About, FAQ, Contact, etc.)

    Two-tier system:
    1. Platform-level defaults (vendor_id=NULL)
    2. Vendor-specific overrides (vendor_id=123)

    Lookup logic:
    1. Check for vendor-specific page (vendor_id + slug)
    2. If not found, use platform default (slug only)
    3. If neither exists, show 404 or default template
    """
    __tablename__ = "content_pages"

    id = Column(Integer, primary_key=True, index=True)

    # Vendor association (NULL = platform default)
    vendor_id = Column(Integer, ForeignKey("vendors.id", ondelete="CASCADE"), nullable=True, index=True)

    # Page identification
    slug = Column(String(100), nullable=False, index=True)  # about, faq, contact, shipping, returns, etc.
    title = Column(String(200), nullable=False)

    # Content
    content = Column(Text, nullable=False)  # HTML or Markdown
    content_format = Column(String(20), default="html")  # html, markdown

    # Template selection (for landing pages)
    # Options: 'default', 'minimal', 'modern', 'full'
    # Only used for landing pages (slug='landing' or 'home')
    template = Column(String(50), default="default", nullable=False)

    # SEO
    meta_description = Column(String(300), nullable=True)
    meta_keywords = Column(String(300), nullable=True)

    # Publishing
    is_published = Column(Boolean, default=False, nullable=False)
    published_at = Column(DateTime(timezone=True), nullable=True)

    # Ordering (for menus, footers)
    display_order = Column(Integer, default=0)
    show_in_footer = Column(Boolean, default=True)
    show_in_header = Column(Boolean, default=False)

    # Timestamps
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)
    updated_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc), nullable=False)

    # Author tracking (admin or vendor user who created/updated)
    created_by = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    updated_by = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)

    # Relationships
    vendor = relationship("Vendor", back_populates="content_pages")
    creator = relationship("User", foreign_keys=[created_by])
    updater = relationship("User", foreign_keys=[updated_by])

    # Constraints
    __table_args__ = (
        # Unique combination: vendor can only have one page per slug
        # Platform defaults (vendor_id=NULL) can only have one page per slug
        UniqueConstraint('vendor_id', 'slug', name='uq_vendor_slug'),

        # Indexes for performance
        Index('idx_vendor_published', 'vendor_id', 'is_published'),
        Index('idx_slug_published', 'slug', 'is_published'),
    )

    def __repr__(self):
        vendor_name = self.vendor.name if self.vendor else "PLATFORM"
        return f"<ContentPage(id={self.id}, vendor={vendor_name}, slug={self.slug}, title={self.title})>"

    @property
    def is_platform_default(self):
        """Check if this is a platform-level default page."""
        return self.vendor_id is None

    @property
    def is_vendor_override(self):
        """Check if this is a vendor-specific override."""
        return self.vendor_id is not None

    def to_dict(self):
        """Convert to dictionary for API responses."""
        return {
            "id": self.id,
            "vendor_id": self.vendor_id,
            "vendor_name": self.vendor.name if self.vendor else None,
            "slug": self.slug,
            "title": self.title,
            "content": self.content,
            "content_format": self.content_format,
            "template": self.template,
            "meta_description": self.meta_description,
            "meta_keywords": self.meta_keywords,
            "is_published": self.is_published,
            "published_at": self.published_at.isoformat() if self.published_at else None,
            "display_order": self.display_order,
            "show_in_footer": self.show_in_footer,
            "show_in_header": self.show_in_header,
            "is_platform_default": self.is_platform_default,
            "is_vendor_override": self.is_vendor_override,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
            "created_by": self.created_by,
            "updated_by": self.updated_by,
        }


# Add relationship to Vendor model
# This should be added to models/database/vendor.py:
# content_pages = relationship("ContentPage", back_populates="vendor", cascade="all, delete-orphan")