# app/modules/contracts/cms.py
"""
CMS module contracts.

Defines the interface for content management functionality that other
modules can depend on without importing the concrete implementation.
"""

from typing import TYPE_CHECKING, Protocol, runtime_checkable

if TYPE_CHECKING:
    from sqlalchemy.orm import Session


@runtime_checkable
class ContentServiceProtocol(Protocol):
    """
    Protocol for content page service.

    Defines the interface for retrieving and managing content pages
    with three-tier resolution (platform > store default > store override).
    """

    def get_page_for_store(
        self,
        db: "Session",
        platform_id: int,
        slug: str,
        store_id: int | None = None,
        include_unpublished: bool = False,
    ) -> object | None:
        """
        Get content page with three-tier resolution.

        Resolution order:
        1. Store override (platform_id + store_id + slug)
        2. Store default (platform_id + store_id=NULL + is_platform_page=False + slug)

        Args:
            db: Database session
            platform_id: Platform ID
            slug: Page slug
            store_id: Store ID (None for defaults only)
            include_unpublished: Include draft pages

        Returns:
            ContentPage or None
        """
        ...

    def get_platform_page(
        self,
        db: "Session",
        platform_id: int,
        slug: str,
        include_unpublished: bool = False,
    ) -> object | None:
        """
        Get a platform marketing page.

        Args:
            db: Database session
            platform_id: Platform ID
            slug: Page slug
            include_unpublished: Include draft pages

        Returns:
            ContentPage or None
        """
        ...

    def list_pages_for_store(
        self,
        db: "Session",
        platform_id: int,
        store_id: int | None = None,
        include_unpublished: bool = False,
        footer_only: bool = False,
        header_only: bool = False,
        legal_only: bool = False,
    ) -> list:
        """
        List all available pages for a store storefront.

        Merges store overrides with store defaults, prioritizing overrides.

        Args:
            db: Database session
            platform_id: Platform ID
            store_id: Store ID (None for store defaults only)
            include_unpublished: Include draft pages
            footer_only: Only pages marked for footer display
            header_only: Only pages marked for header display
            legal_only: Only pages marked for legal/bottom bar display

        Returns:
            List of ContentPage objects
        """
        ...

    def list_platform_pages(
        self,
        db: "Session",
        platform_id: int,
        include_unpublished: bool = False,
        footer_only: bool = False,
        header_only: bool = False,
    ) -> list:
        """
        List platform marketing pages.

        Args:
            db: Database session
            platform_id: Platform ID
            include_unpublished: Include draft pages
            footer_only: Only pages marked for footer display
            header_only: Only pages marked for header display

        Returns:
            List of platform marketing ContentPage objects
        """
        ...


@runtime_checkable
class MediaUsageProviderProtocol(Protocol):
    """Protocol for modules that track media file usage."""

    def get_media_usage(self, db: "Session", media_id: int) -> list[dict]:
        """Return list of usage records.

        Each dict should contain:
            entity_type: str (e.g. "product")
            entity_id: int
            entity_name: str
            usage_type: str (e.g. "main_image", "gallery")
        """
        ...


@runtime_checkable
class MediaServiceProtocol(Protocol):
    """
    Protocol for media library service.

    Defines the interface for managing media files (images, documents, etc.).
    """

    def get_media_by_id(
        self,
        db: "Session",
        media_id: int,
    ) -> object | None:
        """Get media item by ID."""
        ...

    def list_media_for_store(
        self,
        db: "Session",
        store_id: int,
        media_type: str | None = None,
    ) -> list:
        """List media items for a store."""
        ...