From 297d5aca1fbc65763610e48132ee9da0c386e032 Mon Sep 17 00:00:00 2001
From: Nils Schneider <nils.schneider@posteo.de>
Date: Sat, 18 Oct 2025 01:33:12 +0200
Subject: [PATCH] frontend: papercorner for multi-page documents

---
 frontend/src/assets/papercorner.svg       | 19 +++++++
 frontend/src/documents/DocumentsTable.jsx | 61 ++++++++++++++++++-----
 frontend/src/styles.css                   | 41 ++++++++++-----
 3 files changed, 95 insertions(+), 26 deletions(-)
 create mode 100644 frontend/src/assets/papercorner.svg

diff --git a/frontend/src/assets/papercorner.svg b/frontend/src/assets/papercorner.svg
new file mode 100644
index 0000000..3fb513b
--- /dev/null
+++ b/frontend/src/assets/papercorner.svg
@@ -0,0 +1,19 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 128 128" xml:space="preserve" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
+    <defs>
+        <filter id="cornerShadow" x="-20%" y="-20%" width="200%" height="200%">
+            <feDropShadow dx="-4" dy="4" stdDeviation="8" flood-opacity="0.24"/>
+        </filter>
+        <linearGradient id="cornerGradient" gradientUnits="userSpaceOnUse" x1="32" y1="0" x2="0" y2="64">
+            <stop offset="0%" stop-color="#ffffff"/>
+            <stop offset="100%" stop-color="#f3f3f3"/>
+        </linearGradient>
+    </defs>
+    <g filter="url(#cornerShadow)">
+        <g transform="matrix(-1.81626,-1.81626,0.460023,-0.460023,180.663,203.387)">
+            <path d="M70.488,10.11L89.954,86.966L51.022,86.966L70.488,10.11Z" fill="url(#cornerGradient)"/>
+        </g>
+        <g transform="matrix(1.81626,1.81626,-0.460023,0.460023,4.6259,-132.676)">
+            <path d="M70.488,10.11L89.954,86.966L51.022,86.966L70.488,10.11Z" fill="#fdfdfd"/>
+        </g>
+    </g>
+</svg>
diff --git a/frontend/src/documents/DocumentsTable.jsx b/frontend/src/documents/DocumentsTable.jsx
index ee28eca..12660d1 100644
--- a/frontend/src/documents/DocumentsTable.jsx
+++ b/frontend/src/documents/DocumentsTable.jsx
@@ -1,11 +1,36 @@
 import React, { useCallback, useEffect, useMemo, useRef } from 'react';
-import { resolveDocumentAssetUrl } from '../asset_manager';
+import {getAssetFromVersion, resolveDocumentAssetUrl} from '../asset_manager';
 import { getTagColorStyle } from '../utils/colors';
 import { DownloadIcon, EditIcon, ViewListIcon, ViewGridIcon, FolderIcon } from '../ui/icons';
 
 const TAG_MIME_TYPES = ['application/x-papercrate-tag', 'text/papercrate-tag'];
 
-const DocumentThumbnailImage = ({ document, ensureAssetUrl, getDocumentAsset, alt }) => {
+const getPageCount = (doc) =>
+  Number.isFinite(doc?.current_version?.metadata?.page_count)
+    ? doc.current_version.metadata.page_count
+    : null;
+
+const DocumentThumbnailImage = ({ document, ensureAssetUrl, getDocumentAsset, alt, maxSize = 48 }) => {
+  const resolvedMaxSize = Math.max(1, Math.round(maxSize || 1));
+  const thumbnailAsset = useMemo(() => getAssetFromVersion(document?.current_version, 'thumbnail'), [document?.current_version]);
+  const assetWidth = Number(thumbnailAsset?.metadata?.width);
+  const assetHeight = Number(thumbnailAsset?.metadata?.height);
+
+  const dimensions = useMemo(() => {
+    if (!Number.isFinite(assetWidth) || assetWidth <= 0 || !Number.isFinite(assetHeight) || assetHeight <= 0) {
+      return { width: resolvedMaxSize, height: resolvedMaxSize };
+    }
+    const scale = Math.min(1, resolvedMaxSize / assetWidth, resolvedMaxSize / assetHeight);
+    return {
+      width: Math.max(1, Math.round(assetWidth * scale)),
+      height: Math.max(1, Math.round(assetHeight * scale)),
+    };
+  }, [assetWidth, assetHeight, resolvedMaxSize]);
+
+  const innerStyle = useMemo(
+    () => ({ width: `${dimensions.width}px`, height: `${dimensions.height}px` }),
+    [dimensions.height, dimensions.width],
+  );
   const url = useMemo(
     () =>
       resolveDocumentAssetUrl(document, 'thumbnail', {
@@ -15,19 +40,28 @@ const DocumentThumbnailImage = ({ document, ensureAssetUrl, getDocumentAsset, al
     [document, ensureAssetUrl, getDocumentAsset],
   );
 
+  const pageCount = getPageCount(document);
+  const showMultiPageBadge = Number.isFinite(pageCount) && pageCount > 1;
+  const innerClasses = ['document-thumbnail-inner'];
+  if (showMultiPageBadge) {
+    innerClasses.push('document-thumbnail-inner--multipage');
+  }
+
   return (
     <div className="document-thumbnail-wrapper">
-      {url ? (
-        <img
-          src={url}
-          alt={alt || ''}
-          className="document-thumbnail"
-          draggable={false}
-          onDragStart={(event) => event.preventDefault()}
-        />
-      ) : (
-        <div className="thumb-placeholder">DOC</div>
-      )}
+      <div className={innerClasses.join(' ')} style={innerStyle}>
+        {url ? (
+          <img
+            src={url}
+            alt={alt || ''}
+            className="document-thumbnail"
+            draggable={false}
+            onDragStart={(event) => event.preventDefault()}
+          />
+        ) : (
+          <div className="thumb-placeholder">DOC</div>
+        )}
+      </div>
     </div>
   );
 };
@@ -413,6 +447,7 @@ const DocumentsTable = ({
                       ensureAssetUrl={ensureAssetUrl}
                       getDocumentAsset={getDocumentAsset}
                       alt={`Thumbnail for ${doc.title || doc.original_name}`}
+                      maxSize={128}
                     />
                     <div className="document-card__meta">
                       <div
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 9aaa408..8519937 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -845,6 +845,7 @@ button.icon-button.ghost:hover:not([disabled]) {
   color: inherit;
   transition: background 0.12s ease, color 0.12s ease;
   position: relative;
+  display: inline-block;
 }
 
 .folder-row span.name {
@@ -1176,29 +1177,43 @@ button.icon-button.ghost:hover:not([disabled]) {
   text-align: center;
 }
 
-.document-thumbnail-wrapper {
-  width: 48px;
-  height: 48px;
+.documents-panel--view-grid .document-thumbnail-wrapper {
+  width: 128px;
+  height: 128px;
+  padding: 8px;
+  border-radius: 10px;
+  overflow: hidden;
+}
+
+
+.document-thumbnail-inner {
+  position: relative;
   display: inline-flex;
   align-items: center;
   justify-content: center;
 }
 
-.documents-panel--view-grid .document-thumbnail-wrapper {
-  width: 128px;
-  height: 128px;
-  padding: 8px;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  border-radius: 10px;
-  overflow: hidden;
+.document-thumbnail-inner--multipage::after {
+  content: '';
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: 24px;
+  height: 24px;
+  background-image: url('./assets/papercorner.svg');
+  background-repeat: no-repeat;
+  background-size: contain;
+  pointer-events: none;
+}
+
+.documents-panel--view-grid .document-thumbnail-inner--multipage::after {
+  width: 28px;
+  height: 28px;
 }
 
 .document-thumbnail {
   max-width: 100%;
   max-height: 100%;
-  object-fit: contain;
   box-shadow: 0 1px 6px var(--shadow-medium);
 }