# Project notes for agents

## Project snapshot
- **Repo name:** `juri-merger`
- **App name/branding:** `beA-Edit`, published by Nominandum GmbH.
- **Tech stack:** SvelteKit + Svelte 5 (runes) + TypeScript + Vite + Tailwind v4 (CSS-first).
- **UI system:** shadcn-svelte (style `nova`, lucide icons) layered on a custom "nom" theme via CSS variables in `src/routes/layout.css`.
- **Core purpose:** upload one or more ZIP files, extract relevant PDFs/images, preview them, optionally reorder attachments, and download a merged PDF.
- **Active branch:** `features/shadcn` (shadcn-svelte integration in progress).

## Main user flow
1. User adds ZIP files via drag/drop or file picker (`ZipDropzone`).
2. `+page.svelte` starts async extraction for each file (tracked via `archiveGeneration` so stale in-flight extractions are discarded on bulk delete).
3. Each ZIP is processed into one or more `ProcessedZipArchive` entries.
4. `ProcessedZipArchiveEditor` shows thumbnails, allows reordering, and can download the merged PDF.
5. `AttachmentPreview` renders image previews directly and PDF previews via `pdfjs-dist`.
6. A fixed bottom-right settings drawer (`<details>`) exposes **export all** and **delete all** archive actions plus the thumbnail-width slider.

## Important source files
- `src/routes/+page.svelte` — top-level page state, file selection, localStorage-backed thumbnail width, async ZIP processing, bulk export/delete, settings drawer.
- `src/routes/+layout.svelte` — app shell: header with logo and footer with Nominandum GmbH legal/imprint block.
- `src/routes/layout.css` — Tailwind v4 entrypoint; imports `tw-animate-css`, `shadcn-svelte/tailwind.css`, Geist + Nunito fonts; defines the semantic token layer (`--background`, `--primary`, `--secondary`, `--accent`, `--destructive`, `--radius`, etc.) mapping shadcn tokens onto the nom palette, including a `.dark` override.
- `src/lib/zip-processing.ts` — archive extraction, recursive nested ZIP handling, metadata ordering, PDF merge/export, image conversion.
- `src/lib/services/zip-inflating.service.ts` — thin wrapper around `fflate` unzip.
- `src/lib/services/xml-reading.service.ts` — parses XJustiz XML metadata (`sender`, `receiver`, `documentNames`).
- `src/lib/components/ZipDropzone.svelte` — file picker + drag/drop ZIP intake.
- `src/lib/components/ProcessedZipArchiveEditor.svelte` — archive editor (name input, drag reordering, per-archive PDF download, selection mode + sub-document management, export-mode switch).
- `src/lib/components/SubDocumentEditor.svelte` — sub-document block editor (editable name, count, dissolve action, draggable header for block reorder, internal horizontal reorderable attachment list).
- `src/lib/components/AttachmentPreview.svelte` — preview generation for images/PDFs.
- `src/lib/components/ui/button.svelte` — shadcn-backed button atom (see "Button system" below).
- `src/lib/components/ui/card/` — shadcn card composition (`Root/Content/Header/Title/Description/Footer/Action`, re-exported as `Card.*`).
- `src/lib/actions/ripple.ts` — Svelte action that renders a click ripple animation on an element.
- `src/lib/components/icons/` — hand-rolled SVG icon components (`IconSettings`, `IconFile`, `IconMenu`, `IconNeedle`, `IconOffice`, `IconPerson`, `IconTag`, `IconTrash`, `IconChain`, `IconUnknown`). If an icon is missing, report it, and we see if we can create
- `src/lib/utils.ts` — shared `cn()` helper (clsx + tailwind-merge) and `WithElementRef`/`WithoutChild` typing helpers used by shadcn components. 

## Button system
`src/lib/components/ui/button.svelte` is a shadcn-svelte–style primitive adapted to the nom theme:
- Built with `tailwind-variants` (`buttonVariants`) and the shared `cn()` helper.
- Variants: `primary`, `secondary` (gradient `secondary → --secondary-end`), `bordered`, `tertiary`, `success`.
- Sizes: `standard` (h-8, rounded-16px), `large` (h-12, rounded-24px).
- Renders either a `<button>` or an `<a>` (when `href` is set); both apply the `use:ripple` action.
- Accepts an optional `icon` prop (a Svelte component) rendered after `children`.
- `ButtonProps` merges `HTMLButtonAttributes` + `HTMLAnchorAttributes` with `WithElementRef` and `variant`/`size`/`icon`.
- Used across the editor, settings drawer, and the throwaway test buttons on the home `<section>` (still present on the branch).

## ZIP/PDF processing details
- ZIP entries are filtered to ignore macOS metadata (`__MACOSX`, `.DS_Store`, `._*`).
- Relevant attachments are PDFs and common image formats.
- Nested ZIP archives are processed recursively.
- `xjustiz_nachricht.xml` is used to derive archive naming and ordering.
- Ordering prefers document names from metadata before falling back to original attachment order.
- PDF merging uses `pdf-lib`; images are embedded as PNG/JPG, with browser-side canvas conversion for other image types.
- **Sub-documents:** a `ProcessedZipArchive` now has `attachments` ("loose") plus an ordered `subDocuments: SubDocument[]` list. Each `SubDocument` is a named, ordered subset of `ZipAttachment`s that live alongside the loose ones. Sub-documents are created on demand by the user (selection mode in the editor) — when none exist, the archive behaves exactly as before.
- The merge loop is shared via `mergeAttachments(attachments)`; `mergeProcessedZipArchive` flattens the archive via `flattenArchiveForMerge` (sub-documents first, then loose) so backwards compatibility holds.
- Pure helpers in `zip-processing.ts`: `createSubDocument`, `moveSubDocument`, `moveAttachmentInPlace`, `moveAttachmentIntoSubDocument`, `removeAttachmentFromSubDocument`, `dissolveSubDocument`, `flattenArchiveForMerge`, `buildArchiveExport(archive, 'single' | 'separate')`. Cross-list moves preserve the total attachment count invariant.
- **Export modes:** `single` flips the whole archive into one PDF (sub-docs flattened first); `separate` produces one PDF per non-empty sub-document (`{archiveName} - {subName}.pdf`) plus one for any residual loose attachments.

## UI/state details
- Thumbnail width is stored in `localStorage` under `thumbnailWidth` (key constant `THUMBNAIL_WIDTH_STORAGE_KEY`) and clamped to `100..400`; hydration is gated by a `thumbnailWidthHydrated` flag so the initial render does not fight `onMount`.
- Processing progress is shown as a count of pending ZIP files (`pendingZipCount`).
- The editor supports manual attachment reordering via drag-and-drop.
- The settings drawer contains: "Alle ZIP-Archive als PDF exportieren", "Alle ZIP-Archive löschen", and the thumbnail-width range input.
- Bulk delete bumps `archiveGeneration` so otherwise-orphaned async extractions no-op instead of re-populating state.
- **Sub-document editing (`ProcessedZipArchiveEditor.svelte`):**
  - An "Auswählen" / "Fertig" toggle in the header puts the editor into selection mode. Only then are checkboxes rendered on each loose thumbnail (wrapped in a `<label>` for keyboard operability — Tab + Space); in normal mode the editor looks identical to today. `Esc` exits selection mode and clears the selection. Drag-to-reorder is suspended while in selection mode.
  - An inline action bar with "Teildokument erstellen" appears whenever `selectionMode && selectedPaths.size > 0`. Creating a sub-document removes the selected attachments from the loose list, appends a new `SubDocument` block (named "Teildokument N"), clears the selection, and keeps selection mode on.
  - Sub-documents render below the loose list as a vertical stack of `SubDocumentEditor` blocks. Each block has an editable name, a count, an "Auflösen" action (returns its attachments to the end of the loose list), a draggable header (`::`) to reorder the block, and its own horizontal reorderable attachment list.
  - Drag-and-drop is generalised: HTML5 DnD payloads use MIME type `application/x-juri-merger-attachment` (carrying a `AttachmentLocation` of `{ kind: 'loose', index }` or `{ kind: 'subDocument', id, index }`) for attachment moves, and `application/x-juri-merger-block` for reordering whole sub-document blocks. Supported moves: loose↔loose, loose→sub, sub→loose, sub attachment↔sub attachment (same or different sub), and sub-document block↔sub-document block.
  - Export control: with no sub-documents, the existing single "PDF herunterladen" button behaves unchanged. With sub-documents present, a segmented control ("Eine PDF" / "Getrennt") lets the user choose the export mode; "Eine PDF" downloads one flattened PDF, "Getrennt" downloads one PDF per sub-document sequentially.
- **`SubDocumentEditor.svelte`** is the new sub-document block component. It emits `onSubDocumentChange`, `onRemove`, `onAttachmentMove`, and block-level drag callbacks up to the parent; the parent stays the source of truth via `onArchiveChange`.

## Dependencies worth noting
- `fflate` for ZIP extraction
- `pdf-lib` for PDF generation/merging
- `pdfjs-dist` for PDF thumbnail previews
- `bits-ui`, `shadcn-svelte` (CLI/runtime), `clsx`, `tailwind-merge`, `class-variance-authority`, `tailwind-variants`, `tw-animate-css` for the shadcn-svelte UI layer
- `@lucide/svelte` and a set of local SVG icon components for iconography
- `@fontsource-variable/geist` font; custom `Nunito` variable font bundled under `src/lib/assets/`
- `@tailwindcss/vite`, `@tailwindcss/forms`, `@tailwindcss/typography` for styling

## shadcn-svelte configuration
- `components.json`: style `nova`, `iconLibrary` `lucide`, `baseColor` `neutral`, Tailwind CSS path `src/routes/layout.css`.
- Aliases: `components → $lib/components`, `ui → $lib/components/ui`, `utils → $lib/utils`, `hooks → $lib/hooks`, `lib → $lib`.
- `src/lib/hooks/` exists but is currently empty.
- Generated components live under `src/lib/components/ui/`; `button.svelte` is the canonical adapted example (custom variants + ripple + icon prop).

## Current working tree observations
- Branch is `features/shadcn`.
- `agents.md` is being updated to match the post-shadcn-integration state.
- `plan/shadcn-svelte-plan.md` tracks the in-progress migration (only `button` + `card` generated so far; broader UI replacement is still optional/incremental).
- Untracked: `plan/`, and several icons under `src/lib/components/icons/` (`IconChain`, `IconFile`, `IconMenu`, `IconNeedle`, `IconOffice`, `IconPerson`, `IconTag`, `IconTrash`, `IconUnknown`).
- Modified (uncommitted): `agents.md`, `src/lib/components/icons/IconSettings.svelte`, `src/lib/components/ui/button.svelte`, `src/routes/+page.svelte`, `.idea/workspace.xml`.
- `src/lib/services/` is now committed (was previously untracked).