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 # Page Link Feature Specification
-This is the specification for a planned new feature called "Page Link".
-The idea is this: Every page for which page linking is activated will receive a unique identifier (UUID).
-This UUID is creaded once and stored on the page directly.
-Now if a `.pagelink` file exist in a folder that contains the same UUID the page and the folder are considered "linked".
-This allows for a variety of new features:
-- All syntaxes available in this plugin can now be used with the automatic 'blobs' path alias.
-- That means where before you had to write `{{images>/Scape/some/folder/*}}` you can now write `{{images>blobs/*}}` if the page is linked to the folder.
-- This also works for other syntaxes like `{{files>blobs/*}}`.
-- The mapping of pages to folders is cached for performance by this plugin.
-- The UUID is created when the corresponding button is clicked in the editor toolbar.`
-- The UUID is stored in the page metadata as `pagelink: <UUID>`.
-- The UUID is not shown to the user directly, only used internally by the plugin.
-- Instead the user sees that the page is linked to a folder above the page content (next to the pageid).
-- If the page has a UUID but no folder is linked, a text is shown that no folder is linked yet.
-- clicking the text copies the UUID to the clipboard for easy creation of the `.pagelink` file.
-- If a folder is linked, the name of the folder is shown above the page content.
-- The `.pagelink` file is a simple text file that contains the UUID.
-- The `.pagelink` file must be created manually by the user in the folder they want to link to the page.
 
-Additional considerations:
-- Folder can be moved freely, as long as the `.pagelink` file remains in the folder.
-- That means the link is stable even if the folder is moved or renamed.
-- Deleting the `.pagelink` file will unlink the folder from the page.
-- The plugin maintins a cache of all linked folders and their UUIDs for performance.
-- This is done in a mapping file stored in the plugin cache folder.
-- On page load, the plugin checks if the page has a UUID and looks up the linked folder in the cache.
-- If it is not found there, the plugin will search all folders for a matching `.pagelink` file.
-- This search is cached for performance, so it is not done on every page load.
+## Goals
+- Allow linking a Dokuwiki page to a media folder via a stable UUID.
+- Enable the `blobs` alias so plugin syntaxes can use `blobs/*` in place of a concrete path when the page is linked.
+- Keep behavior stable and maintainable; avoid heavy scanning on each page view.
 
-To not overwhelm the server with searches for `.pagelink` files, the following strategy is used:
-- The whole feature is limited to paths under the root aliases defined in the `paths` setting in #file:../admin/main.php 
-- Only folders under these root paths are searched for `.pagelink` files.
-- Additionally a new setting `pagelink_search_depth` is introduced.
-- This setting defines how deep the search for `.pagelink` files goes.
-- For example, if the setting is `2`, only folders that are at most 2 levels deep under the root paths are searched.
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+## Non-Goals
+- Automatic creation of `.pagelink` files (user must create manually).
+- Automatic selection of which folder to link (user decides by placing `.pagelink`).
+- Cross-page bulk management UI.
+
+## Core Concept
+- Each page can have **one** UUID stored in page metadata.
+- A folder is considered linked to the page if it contains a `.pagelink` file whose content matches the page’s UUID.
+
+## Data Model
+- Page metadata key: `pagelink` with value `<UUID>`.
+- `.pagelink` file content: a UUID string.
+- Cache mapping file in plugin cache folder: maps UUID → folder path.
+	- Cache file format: JSON (human-readable, easy to debug).
+	- Cache file name: `pagelink_cache.json`.
+
+## UUID
+- UUID is created only via a toolbar button.
+- UUID is created once and stored in metadata.
+	- UUID is v4 lowercase.
+- UUID is not shown directly to the user (except for copy-to-clipboard).
+
+## UI/UX Behavior
+- Above page content (next to pageid), show link status.
+- If UUID exists and folder is linked: show the linked folder name.
+- If UUID exists but no folder is linked: show a “not linked yet” status.
+	- Clicking the status copies the UUID to clipboard for easy `.pagelink` creation.
+	- Status text: "Not linked: Copy ID"
+  - Copy action does not show anything. No native toasts available
+- If UUID does not exist: no status is shown.
+
+## Linking Rules
+- Folder can be moved or renamed; link remains as long as `.pagelink` file stays in that folder.
+- Deleting the `.pagelink` file unlinks the folder.
+- If multiple folders contain the same UUID:
+  - Page shows a linked status with the first found folder.
+  - Triangle warning icon appears next to folder name.
+
+## Search Scope
+- Searches for `.pagelink` files are limited to paths under root aliases defined in `paths` in [admin/main.php](../admin/main.php).
+- New setting `pagelink_search_depth` limits maximum depth under each root path.
+	- Example: depth `2` means only folders at most 2 levels deep are searched.
+  - Integer value, default `3`.
+  - No negative values allowed.
+
+## Cache Strategy
+- Mapping of UUID → folder path is cached in a mapping file for performance.
+- On page load:
+	1. If page has UUID, check cache for linked folder.
+	2. If cache miss, scan folders (within scope) for `.pagelink`.
+	3. Update cache with any matches.
+- Cache invalidation strategy:
+	- No automatic cache rebuilds.
+	- When encountering stale cache entry (moved/deleted folder) while looking for a pages linked folder, remove from cache and rescan.
+
+- Cache writes are atomic (write temp + rename) and use `LOCK_EX`.
+
+## Performance Constraints
+- Avoid full-tree scans on every page view.
+
+## Security & Safety
+- Never scan outside configured root paths.
+- ignore symlinks.
+- Handle unreadable folders/files gracefully (no fatal errors).
+
+## Acceptance Criteria
+- Clicking toolbar button sets metadata `pagelink` to a valid UUID.
+- If a matching `.pagelink` exists in a scoped folder, `blobs/*` resolves to that folder.
+- If `.pagelink` is deleted, the link is removed on next lookup and UI reflects “not linked yet”.
+- Cache prevents repeated scans on consecutive page views.
+- Search depth obeys `pagelink_search_depth`.
+
+## Edge Cases
+- Page has UUID but `.pagelink` file is empty or invalid UUID.
+- Multiple `.pagelink` files with same UUID in different folders.
+- UUID in metadata is malformed.
+- Folder contains `.pagelink` but no read permissions.
+- Page is deleted/renamed after UUID creation.
+
+## Documentation Updates
+- Update README to describe the feature, settings, and manual `.pagelink` workflow.
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