Page Models and Content Structure

class Page(
    WorkflowMixin,
    PreviewableMixin, 
    DraftStateMixin,
    LockableMixin,
    RevisionMixin,
    TranslatableMixin,
    SpecificMixin,
    MP_Node,
    index.Indexed,
    ClusterableModel
):
    """
    Base page model with full CMS functionality.
    
    Core Fields:
        title (str): Page title
        draft_title (str): Draft version of title (auto-managed)
        slug (str): URL slug for the page
        content_type (ForeignKey): Content type for polymorphic behavior
        url_path (str): Full URL path from site root (auto-managed)
        seo_title (str): SEO-optimized title
        search_description (str): Meta description for search engines
        show_in_menus (bool): Whether page appears in navigation
        owner (User): Page owner for permissions
        
    Publishing Fields (from DraftStateMixin):
        live (bool): Whether page is published and visible
        has_unpublished_changes (bool): Whether there are unpublished changes
        first_published_at (datetime): When page was first published
        last_published_at (datetime): When page was last published
        latest_revision_created_at (datetime): When latest revision was created
        go_live_at (datetime): Scheduled publish time
        expire_at (datetime): Scheduled expiration time
        expired (bool): Whether page has expired
        live_revision (ForeignKey): Currently live revision
        
    Locking Fields (from LockableMixin):
        locked (bool): Whether page is locked for editing
        locked_by (User): User who locked the page
        locked_at (datetime): When page was locked
        
    Revision Fields (from RevisionMixin):
        latest_revision (ForeignKey): Most recent revision
        
    Translation Fields (from TranslatableMixin):
        locale (ForeignKey): Language/locale for this page
        translation_key (UUID): Links translations together
        
    Tree Fields (from MP_Node):
        path (str): Tree path for hierarchical queries
        depth (int): Tree depth level
        numchild (int): Number of direct children
        
    Other Fields:
        alias_of (ForeignKey): Original page if this is an alias
    """
    # Core fields
    title: str
    draft_title: str
    slug: str
    content_type: ContentType
    url_path: str
    seo_title: str
    search_description: str
    show_in_menus: bool
    owner: User
    
    # Publishing state (DraftStateMixin)
    live: bool
    has_unpublished_changes: bool
    first_published_at: datetime
    last_published_at: datetime
    latest_revision_created_at: datetime
    go_live_at: datetime
    expire_at: datetime
    expired: bool
    live_revision: Revision
    
    # Locking (LockableMixin)
    locked: bool
    locked_by: User
    locked_at: datetime
    
    # Revisions (RevisionMixin)
    latest_revision: Revision
    
    # Translation (TranslatableMixin)
    locale: Locale
    translation_key: UUID
    
    # Tree structure (MP_Node)
    path: str
    depth: int
    numchild: int
    
    # Aliases
    alias_of: Page
    
    # URL and routing methods
    def get_url(self, request=None, current_site=None):
        """Get the URL for this page."""
    
    def get_full_url(self, request=None):
        """Get the absolute URL including domain for this page."""
    
    def route(self, request, path_components):
        """Route a request to this page or its descendants."""
    
    def set_url_path(self, parent):
        """Update the url_path field based on this page's slug and parent."""
    
    @classmethod
    def route_for_request(cls, request, path):
        """Find the page to serve for the given request path."""
    
    @classmethod  
    def find_for_request(cls, request, path):
        """Find page matching the request, returns (page, args, kwargs)."""
    
    # Content serving methods
    def serve(self, request):
        """Serve this page for the given request."""
    
    def get_context(self, request):
        """Get template context for rendering this page."""
    
    def get_template(self, request, *args, **kwargs):
        """Get template for rendering this page."""
    
    # Admin interface methods
    def get_admin_display_title(self):
        """Get title for display in admin interface."""
    
    def get_admin_base_path(self):
        """Get the base path for admin URLs for this page."""
    
    # Lifecycle methods
    def save(self, *args, **kwargs):
        """Save the page, updating URL paths and search index."""
    
    def delete(self):
        """Delete the page and all its descendants."""
    
    def clean(self):
        """Validate the page before saving."""
    
    # Content management methods  
    def copy(self, recursive=False, to=None, update_attrs=None, copy_revisions=True):
        """Create a copy of this page."""
    
    def move(self, target, pos=None):
        """Move this page to a new location in the tree."""
    
    def update_aliases(self, *, revision=None, _content_json=None, user=None):
        """Update any aliases of this page with new content."""
    
    # Tree traversal methods
    def get_children(self):
        """Get direct children of this page."""
    
    def get_descendants(self, inclusive=False):
        """Get all descendants of this page."""
    
    def get_ancestors(self, inclusive=False):
        """Get all ancestors of this page."""
    
    def get_siblings(self, inclusive=False):
        """Get sibling pages at the same level."""
    
    def is_site_root(self):
        """Check if this page is the root of a site."""
    
    # Validation methods
    @classmethod
    def can_exist_under(cls, parent):
        """Check if this page type can be created under the parent."""
    
    @classmethod
    def can_create_at(cls, parent):
        """Check if this page type can be created under the parent."""
    
    def can_move_to(self, parent):
        """Check if this page can be moved under the parent."""
    
    @classmethod
    def allowed_parent_page_models(cls):
        """Get allowed parent page models for this page type."""
    
    @classmethod
    def allowed_subpage_models(cls):
        """Get allowed subpage models under this page type."""
    
    # Permission methods
    def permissions_for_user(self, user):
        """Get permission tester for the given user."""
        
    def get_view_restrictions(self):
        """Get view restrictions applying to this page."""
    
    # Workflow methods
    def get_workflow(self):
        """Get the workflow assigned to this page."""
    
    # SEO and sitemap methods
    def get_sitemap_urls(self, request=None):
        """Get URLs for XML sitemap generation."""
    
    # Caching methods
    def get_cache_key_components(self):
        """Get components for generating cache keys."""
    
    # HTTP method validation
    @classmethod
    def allowed_http_method_names(cls):
        """Get allowed HTTP methods for this page type."""

class RevisionMixin:
    """
    Adds revision capabilities to models.
    
    Methods provide version control and content history.
    """
    def save_revision(self, user=None, approved_go_live_at=None, changed=True, log_action=False, previous_revision=None, clean=True):
        """
        Save a new revision of this object.
        
        Parameters:
            user: User who made the changes
            approved_go_live_at: When changes should go live
            changed: Whether content has changed
            log_action: Whether to log this action
            previous_revision: Previous revision for comparison
            clean: Whether to clean the object before saving
        """
    
    def get_latest_revision(self):
        """Get the most recent revision."""
    
    def get_latest_revision_as_object(self):
        """Get the content of the latest revision as an object."""

class DraftStateMixin:
    """
    Adds draft/live state management to models.
    
    Provides publishing workflow capabilities.
    """
    live: bool
    has_unpublished_changes: bool
    first_published_at: datetime
    last_published_at: datetime
    go_live_at: datetime
    expire_at: datetime
    expired: bool
    live_revision: Revision
    
    def publish(self, revision=None, user=None):
        """Publish this content, making it live."""
    
    def unpublish(self, set_expired=False, commit=True, user=None):
        """Remove this content from live site."""
    
    def get_latest_revision_as_object(self):
        """Get latest revision content as object (overrides RevisionMixin)."""
    
    def get_scheduled_revision_as_object(self):
        """Get scheduled revision if one exists."""
    
    @property
    def status_string(self):
        """Get human-readable status for admin display."""

class LockableMixin:
    """
    Adds content locking functionality to prevent concurrent editing.
    """
    locked: bool
    locked_by: User
    locked_at: datetime
    
    def get_lock(self):
        """Get lock object if this content is locked."""
    
    def with_content_json(self, content):
        """Return a copy with the given content restored."""

class WorkflowMixin:
    """
    Adds workflow support for approval processes.
    """
    @property
    def current_workflow_task_state(self):
        """Get current workflow task state."""
    
    @property
    def current_workflow_task(self):
        """Get current workflow task."""
    
    @property  
    def workflow_states(self):
        """Get all workflow states for this content."""
    
    @classmethod
    def get_default_workflow(cls):
        """Get default workflow for this content type."""
    
    def get_workflow(self):
        """Get the workflow assigned to this content."""

class PreviewableMixin:
    """
    Adds preview functionality for draft content.
    """
    @property
    def preview_modes(self):
        """Get available preview modes."""
    
    @property
    def preview_sizes(self):
        """Get available preview sizes."""
    
    def serve_preview(self, request, mode_name):
        """Serve a preview of this content."""
    
    def make_preview_request(self, request=None, mode_name=''):
        """Create a fake request for previewing content."""
    
    def get_preview_context(self, request, mode_name):
        """Get context for preview rendering."""
    
    def get_preview_template(self, request, mode_name):
        """Get template for preview rendering."""
    
    def is_previewable(self):
        """Check if this content can be previewed."""

class TranslatableMixin:
    """
    Adds translation support for multi-language content.
    """
    locale: Locale
    translation_key: UUID
    
    def get_translations(self, inclusive=False):
        """Get all translations of this content."""
    
    def copy_for_translation(self, locale):
        """Create a copy for translation to another locale."""

class Revision:
    """
    Represents a saved version of page or model content.
    """
    content_object: Model
    base_content_type: ContentType
    object_str: str
    created_at: datetime
    user: User
    approved_go_live_at: datetime
    
    def as_object(self):
        """Return the content of this revision as a model instance."""
    
    def publish(self):
        """Publish this revision, making it live."""
    
    def is_latest_revision(self):
        """Check if this is the latest revision."""
    
    def get_previous(self):
        """Get the previous revision."""
    
    def get_next(self):
        """Get the next revision."""

class Collection:
    """
    Organizes media and content with hierarchical permissions.
    """
    name: str
    path: str
    
    def get_descendants(self, inclusive=False):
        """Get all descendant collections."""
    
    def get_ancestors(self, inclusive=False):
        """Get all ancestor collections."""
    
    def get_view_restrictions(self):
        """Get view restrictions for this collection."""

class Site:
    """
    Represents a website with its own domain and root page.
    """
    hostname: str
    port: int
    site_name: str
    root_page: Page
    root_url: str
    
    @classmethod
    def find_for_request(cls, request):
        """Find the Site object for the given HTTP request."""
    
    @classmethod
    def get_site_root_paths(cls):
        """Get URL paths for all site root pages."""

class Locale:
    """
    Represents a language/region combination for internationalization.
    """
    language_code: str
    region_code: str
    
    @classmethod
    def get_default(cls):
        """Get the default locale for the site."""
    
    @classmethod
    def get_active(cls):
        """Get all active locales."""

class GroupPagePermission:
    """
    Assigns page permissions to user groups.
    """
    group: Group
    page: Page
    permission: Permission
    
    objects: GroupPagePermissionManager

class PageViewRestriction:
    """
    Restricts page viewing to specific users or groups.
    """
    page: Page
    restriction_type: str  # 'password', 'groups', 'login'
    password: str
    groups: ManyToManyField[Group]
    
    def save(self, **kwargs):
        """Save with audit logging."""
    
    def delete(self, **kwargs):
        """Delete with audit logging."""

class PagePermissionTester:
    """
    Utility class for testing user permissions on pages.
    """
    def __init__(self, user, page):
        """Initialize with user and page to test."""
    
    def can_edit(self):
        """Check if user can edit the page."""
    
    def can_delete(self):
        """Check if user can delete the page."""
    
    def can_publish(self):
        """Check if user can publish the page."""
    
    def can_unpublish(self):
        """Check if user can unpublish the page."""

from wagtail.models import Page
from wagtail.fields import RichTextField
from wagtail.admin.panels import FieldPanel
from django.db import models

class BlogPage(Page):
    """Custom page model for blog posts."""
    date = models.DateField("Post date")
    intro = models.CharField(max_length=250)
    body = RichTextField(blank=True)
    
    content_panels = Page.content_panels + [
        FieldPanel('date'),
        FieldPanel('intro'),
        FieldPanel('body'),
    ]
    
    def get_context(self, request):
        context = super().get_context(request)
        context['recent_posts'] = BlogPage.objects.live().order_by('-date')[:5]
        return context

# Get all pages under a section
section_page = Page.objects.get(slug='news')
news_articles = section_page.get_children().live().order_by('-first_published_at')

# Move a page to a new parent
page_to_move = Page.objects.get(slug='old-location')
new_parent = Page.objects.get(slug='new-section')
page_to_move.move(new_parent, pos='last-child')

# Copy a page with all its content
original_page = Page.objects.get(slug='template-page')
copied_page = original_page.copy(
    recursive=True,  # Copy child pages too
    update_attrs={'title': 'New Page Title', 'slug': 'new-page-slug'}
)

from wagtail.models import RevisionMixin, DraftStateMixin
from django.db import models

class Article(RevisionMixin, DraftStateMixin, models.Model):
    """Custom model with revision and publishing capabilities."""
    title = models.CharField(max_length=255)
    content = models.TextField()
    
    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)
        # Save revision after saving the model
        self.save_revision()
    
    def go_live(self):
        """Publish this article."""
        self.live = True
        self.save()
        self.publish()