change things

src/contexts/AdminLibraryContext.jsx

@@ -259,6 +259,27 @@ export function LibraryProvider({ children }) {
     [request],
   );
 
+  const detachUnitFromCourse = useCallback(
+    (unitId, courseId) =>
+      request(async () => {
+        const { data } = await api.delete(`/admin/courses/${courseId}/units/${unitId}`);
+        toast("Detached from course.");
+        return data;
+      }),
+    [request],
+  );
+
+  const attachUnitToCourses = useCallback(
+    (unitId, courseIds) =>
+      request(async () => {
+        await Promise.all(
+          courseIds.map((courseId) => api.post(`/admin/courses/${courseId}/units/attach`, { unit_ids: [unitId] }))
+        );
+        toast(`Attached to ${courseIds.length} course${courseIds.length === 1 ? "" : "s"}.`);
+      }),
+    [request],
+  );
+
   const reorderUnitLessons = useCallback(
     (unitId, lessonIds) =>
       request(async () => {
@@ -477,7 +498,7 @@ export function LibraryProvider({ children }) {
     permanentlyDeleteUnit, permanentlyDeleteUnits,
     fetchUnitArchiveImpact, fetchUnitPermanentDeleteImpact,
     fetchUnitFieldValues,
-    attachLessonsToUnit, detachLessonFromUnit, reorderUnitLessons,
+    attachLessonsToUnit, detachLessonFromUnit, detachUnitFromCourse, attachUnitToCourses, reorderUnitLessons,
     fetchUnitProduct, saveUnitProduct, removeUnitProduct,
 
     // lesson library

src/modules/admin/components/library/AttachCoursesDialog.jsx

@@ -0,0 +1,125 @@
+// AttachCoursesDialog — pick existing Courses and attach this Unit to them.
+// Mirror of AttachUnitsDialog, run in the opposite direction: a unit can be
+// attached to more than one course, so selection is multi-select here too.
+
+import { useEffect, useMemo, useState } from "react";
+import { Search, Link2 } from "lucide-react";
+
+import { useCourses } from "@/contexts/AdminCoursesContext";
+import {
+  Dialog, DialogContent, DialogDescription, DialogFooter,
+  DialogHeader, DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Checkbox } from "@/components/ui/checkbox";
+import { ScrollArea } from "@/components/ui/scroll-area";
+import { Spinner } from "@/components/ui/spinner";
+import { formatDuration } from "@/utils/timestamp.util";
+
+export default function AttachCoursesDialog({ open, onOpenChange, attachedCourseIds = [], onAttach, loading }) {
+  const { fetchCoursesFlat, loading: coursesLoading } = useCourses();
+  const [courses, setCourses] = useState([]);
+  const [query, setQuery] = useState("");
+  const [selected, setSelected] = useState([]);
+
+  useEffect(() => {
+    if (open) {
+      setSelected([]);
+      setQuery("");
+      fetchCoursesFlat().then((c) => setCourses(c ?? []));
+    }
+  }, [open, fetchCoursesFlat]);
+
+  const attachedSet = useMemo(
+    () => new Set(attachedCourseIds.map(String)),
+    [attachedCourseIds]
+  );
+
+  const candidates = useMemo(() => {
+    const q = query.trim().toLowerCase();
+    return (courses ?? [])
+      .filter((c) => !attachedSet.has(String(c.course_id)))
+      .filter((c) => !q || c.title?.toLowerCase().includes(q));
+  }, [courses, attachedSet, query]);
+
+  const toggle = (courseId) =>
+    setSelected((prev) =>
+      prev.includes(courseId) ? prev.filter((id) => id !== courseId) : [...prev, courseId]
+    );
+
+  const handleAttach = async () => {
+    if (!selected.length) return;
+    await onAttach(selected);
+    onOpenChange(false);
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent className="sm:max-w-lg">
+        <DialogHeader>
+          <DialogTitle className="flex items-center gap-2">
+            <Link2 className="h-4 w-4" /> Select Courses
+          </DialogTitle>
+          <DialogDescription>
+            Attach this unit to one or more existing courses without copying it.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="relative">
+          <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
+          <Input
+            placeholder="Search courses..."
+            className="pl-8"
+            value={query}
+            onChange={(e) => setQuery(e.target.value)}
+          />
+        </div>
+
+        <ScrollArea className="h-64 rounded-md border">
+          {coursesLoading ? (
+            <div className="flex items-center justify-center h-full py-10">
+              <Spinner className="h-5 w-5" />
+            </div>
+          ) : candidates.length === 0 ? (
+            <p className="text-sm text-muted-foreground text-center py-10">
+              {query ? "No courses match your search." : "This unit is already attached to every course."}
+            </p>
+          ) : (
+            <div className="divide-y">
+              {candidates.map((c) => (
+                <label
+                  key={c.course_id}
+                  className="flex items-center gap-3 px-3 py-2.5 hover:bg-muted/60 cursor-pointer"
+                >
+                  <Checkbox
+                    checked={selected.includes(c.course_id)}
+                    onCheckedChange={() => toggle(c.course_id)}
+                  />
+                  <div className="flex-1 min-w-0">
+                    <p className="text-sm font-medium w-64 truncate" title={c.title}>
+                      {c.title}
+                    </p>
+                    <p className="text-xs text-muted-foreground truncate">
+                      {formatDuration(c.duration_seconds ?? 0)}
+                    </p>
+                  </div>
+                </label>
+              ))}
+            </div>
+          )}
+        </ScrollArea>
+
+        <DialogFooter>
+          <Button variant="outline" onClick={() => onOpenChange(false)} disabled={loading}>
+            Cancel
+          </Button>
+          <Button onClick={handleAttach} disabled={loading || !selected.length}>
+            {loading && <Spinner className="h-4 w-4 mr-2" />}
+            Attach {selected.length > 0 ? `(${selected.length})` : ""}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/modules/admin/pages/assets/ViewImageAsset.jsx

@@ -1,12 +1,14 @@
 // modules/admin/pages/assets/ViewImageAsset.jsx
 
+import { useState } from "react";
 import { useParams, useNavigate } from "react-router-dom";
-import { ArrowLeft, Lock, Globe, Pencil } from "lucide-react";
+import { ArrowLeft, Lock, Globe, Pencil, Download } from "lucide-react";
 import { useDateFormat } from "@/hooks/useDateFormat";
 
 import { useAssetFetchState } from "@/hooks/useAssetFetchState";
 import { useAssetPreviewSrc } from "@/hooks/useAssetPreviewSrc";
 import { formatFileSize } from "@/utils/format.util";
+import { downloadAsset } from "@/utils/media.util";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Separator } from "@/components/ui/separator";
@@ -15,109 +17,123 @@ import AssetPageLoader from "@/components/generic/AssetLoader";
 
 
 function MetaRow({ label, value }) {
-    if (!value && value !== 0) return null;
-    return (
-        <div className="flex items-start gap-3 py-2">
-            <span className="text-muted-foreground text-sm w-36 shrink-0">{label}</span>
-            <span className="text-sm font-medium break-all">{String(value)}</span>
-        </div>
-    );
+  if (!value && value !== 0) return null;
+  return (
+    <div className="flex items-start gap-3 py-2">
+      <span className="text-muted-foreground text-sm w-36 shrink-0">{label}</span>
+      <span className="text-sm font-medium break-all">{String(value)}</span>
+    </div>
+  );
 }
 
 export default function ViewImageAsset() {
-    const { assetId } = useParams();
-    const navigate = useNavigate();
-    const { fmtDateTime } = useDateFormat();
+  const { assetId } = useParams();
+  const navigate = useNavigate();
+  const { fmtDateTime } = useDateFormat();
 
-    const { asset: selectedAsset, loading, notFound } = useAssetFetchState(assetId);
-    const { src: streamUrl, loading: previewLoading } = useAssetPreviewSrc(selectedAsset, { scope: "admin" });
+  const { asset: selectedAsset, loading, notFound } = useAssetFetchState(assetId);
+  const { src: streamUrl, loading: previewLoading } = useAssetPreviewSrc(selectedAsset, { scope: "admin" });
+  const [downloading, setDownloading] = useState(false);
 
-    if (loading) {
-        return <AssetPageLoader />;
+  async function handleDownload() {
+    setDownloading(true);
+    try {
+      await downloadAsset(selectedAsset, { scope: "admin" });
+    } finally {
+      setDownloading(false);
     }
+  }
 
-    if (notFound) {
-        return (
-            <div className="flex flex-col items-center justify-center h-96 gap-3 text-muted-foreground">
-                <p>Asset not found.</p>
-                <Button variant="outline" onClick={() => navigate("/admin/assets")}>Go Back</Button>
-            </div>
-        );
-    }
-
-    const a = selectedAsset;
+  if (loading) {
+    return <AssetPageLoader />;
+  }
 
+  if (notFound) {
     return (
-        <div className="max-w-7xl mx-auto px-4 py-6 space-y-6">
-
-            {/* ── Header ── */}
-            <div className="flex items-center gap-3">
-                <Button variant="ghost" size="icon" onClick={() => navigate("/admin/assets")}>
-                    <ArrowLeft className="h-4 w-4" />
-                </Button>
-                <div className="flex-1 min-w-0">
-                    <h1 className="text-xl font-semibold truncate">{a.display_name ?? a.original_name}</h1>
-                    <p className="text-sm text-muted-foreground">{a.mime_type}</p>
-                </div>
-                <Button variant="outline" onClick={() => navigate(`/admin/assets/edit/${a.asset_id}`)}>
-                    <Pencil className="h-3.5 w-3.5" />
-                    Edit Info
-                </Button>
-            </div>
-
-            <div className="grid grid-cols-1 lg:grid-cols-5 gap-6">
-
-                {/* ── Image preview ── */}
-                <div className="lg:col-span-3 rounded-lg border overflow-hidden">
-                    <FileZoomViewer
-                        src={streamUrl}
-                        mimeType={a.mime_type}
-                        fileName={a.display_name ?? a.original_name}
-                        loading={previewLoading}
-                    />
-                </div>
-
-                {/* ── Metadata panel ── */}
-                <div className="lg:col-span-2 space-y-4">
-                    <div className="rounded-lg border bg-card p-4 space-y-1">
-                        <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">File Info</p>
-                        <MetaRow label="Original Name" value={a.original_name} />
-                        <MetaRow label="Extension" value={a.extension} />
-                        <MetaRow label="File Size" value={formatFileSize(a.file_size)} />
-                        <MetaRow label="Resolution" value={a.resolution} />
-                        <MetaRow label="Dimensions" value={a.width && a.height ? `${a.width} × ${a.height}` : null} />
-                        <Separator className="my-2" />
-                        <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Storage</p>
-                        <MetaRow label="Provider" value={a.storage_provider} />
-                        <MetaRow label="Bucket" value={a.storage_bucket} />
-                        <MetaRow label="Key" value={a.storage_key} />
-                        <Separator className="my-2" />
-                        <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Access</p>
-                        <div className="flex items-center gap-2 py-1">
-                            {a.is_public
-                                ? <><Globe className="h-3.5 w-3.5 text-green-500" /><Badge variant="outline" className="text-green-600 border-green-400">Public</Badge></>
-                                : <><Lock className="h-3.5 w-3.5 text-yellow-500" /><Badge variant="outline" className="text-yellow-600 border-yellow-400">Private</Badge></>
-                            }
-                        </div>
-                        <MetaRow label="Access Level" value={a.access_level} />
-                        <MetaRow label="Owner Type" value={a.owner_type} />
-                        <MetaRow label="Owner ID" value={a.owner_id} />
-                        <Separator className="my-2" />
-                        <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Timestamps</p>
-                        <MetaRow label="Created By" value={a.creator?.full_name ?? a.createdBy} />
-                        <MetaRow label="Created" value={a.createdAt ? fmtDateTime(a.createdAt) : null} />
-                        <MetaRow label="Modified By" value={a.updater?.full_name ?? a.updatedBy} />
-                        <MetaRow label="Modified" value={a.updatedAt ? fmtDateTime(a.updatedAt) : null} />
-                    </div>
-
-                    {a.description && (
-                        <div className="rounded-lg border bg-card p-4">
-                            <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Description</p>
-                            <p className="text-sm text-foreground">{a.description}</p>
-                        </div>
-                    )}
-                </div>
-            </div>
-        </div>
+      <div className="flex flex-col items-center justify-center h-96 gap-3 text-muted-foreground">
+        <p>Asset not found.</p>
+        <Button variant="outline" onClick={() => navigate("/admin/assets")}>Go Back</Button>
+      </div>
     );
+  }
+
+  const a = selectedAsset;
+
+  return (
+    <div className="max-w-7xl mx-auto px-4 py-6 space-y-6">
+
+      {/* ── Header ── */}
+      <div className="flex items-center gap-3">
+        <Button variant="ghost" size="icon" onClick={() => navigate("/admin/assets")}>
+          <ArrowLeft className="h-4 w-4" />
+        </Button>
+        <div className="flex-1 min-w-0">
+          <h1 className="text-xl font-semibold truncate">{a.display_name ?? a.original_name}</h1>
+          <p className="text-sm text-muted-foreground">{a.mime_type}</p>
+        </div>
+        <Button variant="outline" className="hidden" onClick={handleDownload} disabled={downloading}>
+          <Download className="h-3.5 w-3.5" />
+          {downloading ? "Downloading…" : "Download"}
+        </Button>
+        <Button variant="outline" onClick={() => navigate(`/admin/assets/edit/${a.asset_id}`)}>
+          <Pencil className="h-3.5 w-3.5" />
+          Edit Info
+        </Button>
+      </div>
+
+      <div className="grid grid-cols-1 lg:grid-cols-5 gap-6">
+
+        {/* ── Image preview ── */}
+        <div className="lg:col-span-3 rounded-lg border overflow-hidden">
+          <FileZoomViewer
+            src={streamUrl}
+            mimeType={a.mime_type}
+            fileName={a.display_name ?? a.original_name}
+            loading={previewLoading}
+          />
+        </div>
+
+        {/* ── Metadata panel ── */}
+        <div className="lg:col-span-2 space-y-4">
+          <div className="rounded-lg border bg-card p-4 space-y-1">
+            <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">File Info</p>
+            <MetaRow label="Original Name" value={a.original_name} />
+            <MetaRow label="Extension" value={a.extension} />
+            <MetaRow label="File Size" value={formatFileSize(a.file_size)} />
+            <MetaRow label="Resolution" value={a.resolution} />
+            <MetaRow label="Dimensions" value={a.width && a.height ? `${a.width} × ${a.height}` : null} />
+            <Separator className="my-2" />
+            <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Storage</p>
+            <MetaRow label="Provider" value={a.storage_provider} />
+            <MetaRow label="Bucket" value={a.storage_bucket} />
+            <MetaRow label="Key" value={a.storage_key} />
+            <Separator className="my-2" />
+            <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Access</p>
+            <div className="flex items-center gap-2 py-1">
+              {a.is_public
+                ? <><Globe className="h-3.5 w-3.5 text-green-500" /><Badge variant="outline" className="text-green-600 border-green-400">Public</Badge></>
+                : <><Lock className="h-3.5 w-3.5 text-yellow-500" /><Badge variant="outline" className="text-yellow-600 border-yellow-400">Private</Badge></>
+              }
+            </div>
+            <MetaRow label="Access Level" value={a.access_level} />
+            <MetaRow label="Owner Type" value={a.owner_type} />
+            <MetaRow label="Owner ID" value={a.owner_id} />
+            <Separator className="my-2" />
+            <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Timestamps</p>
+            <MetaRow label="Created By" value={a.creator?.full_name ?? a.createdBy} />
+            <MetaRow label="Created" value={a.createdAt ? fmtDateTime(a.createdAt) : null} />
+            <MetaRow label="Modified By" value={a.updater?.full_name ?? a.updatedBy} />
+            <MetaRow label="Modified" value={a.updatedAt ? fmtDateTime(a.updatedAt) : null} />
+          </div>
+
+          {a.description && (
+            <div className="rounded-lg border bg-card p-4">
+              <p className="text-xs font-semibold uppercase tracking-wide text-muted-foreground mb-2">Description</p>
+              <p className="text-sm text-foreground">{a.description}</p>
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
 }

src/modules/admin/pages/library/units/ViewLibraryUnit.jsx

@@ -10,6 +10,7 @@ import { useLibrary } from "@/contexts/AdminLibraryContext";
 import { PageMeta } from "@/contexts/MetadataContext";
 import AppBreadcrumb from "@/components/generic/Breadcrumb/AppBreadcrumb";
 import AttachLessonsDialog from "../../../components/library/AttachLessonsDialog";
+import AttachCoursesDialog from "../../../components/library/AttachCoursesDialog";
 import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Spinner } from "@/components/ui/spinner";
@@ -20,11 +21,12 @@ export default function ViewLibraryUnit() {
   const { unitId } = useParams();
   const {
     fetchUnit, unit, loading,
-    attachLessonsToUnit, detachLessonFromUnit, reorderUnitLessons,
+    attachLessonsToUnit, detachLessonFromUnit, detachUnitFromCourse, attachUnitToCourses, reorderUnitLessons,
   } = useLibrary();
 
   const [initializing, setInitializing] = useState(true);
   const [attachOpen, setAttachOpen] = useState(false);
+  const [attachCourseOpen, setAttachCourseOpen] = useState(false);
   const [descExpanded, setDescExpanded] = useState(false);
 
   useEffect(() => {
@@ -57,6 +59,16 @@ export default function ViewLibraryUnit() {
     fetchUnit(unitId);
   };
 
+  const handleDetachCourse = async (courseId) => {
+    await detachUnitFromCourse(unitId, courseId);
+    fetchUnit(unitId);
+  };
+
+  const handleAttachCourses = async (courseIds) => {
+    await attachUnitToCourses(unitId, courseIds);
+    fetchUnit(unitId);
+  };
+
   const handleAttach = async (lessonIds) => {
     await attachLessonsToUnit(unitId, lessonIds);
     fetchUnit(unitId);
@@ -101,6 +113,21 @@ export default function ViewLibraryUnit() {
                 )}
               </div>
               <div className="flex gap-2 shrink-0">
+                <Button size="sm" variant="outline" onClick={() => setAttachCourseOpen(true)}>
+                  <Link2 className="h-3.5 w-3.5 mr-1.5" /> Attach to Course
+                </Button>
+                {courses.map((c) => (
+                  <Button
+                    key={c.course_id}
+                    size="sm"
+                    variant="destructive"
+                    onClick={() => handleDetachCourse(c.course_id)}
+                    disabled={loading}
+                    title={`Detach from ${c.title} (unit stays in library)`}
+                  >
+                    <Unlink className="h-3.5 w-3.5 mr-1.5" /> Detach from Course
+                  </Button>
+                ))}
                 <Button size="sm" variant="outline" onClick={() => navigate(`/admin/units/${unitId}/edit`)}>
                   <Pencil className="h-3.5 w-3.5 mr-1.5" /> Edit
                 </Button>
@@ -249,6 +276,14 @@ export default function ViewLibraryUnit() {
         onAttach={handleAttach}
         loading={loading}
       />
+
+      <AttachCoursesDialog
+        open={attachCourseOpen}
+        onOpenChange={setAttachCourseOpen}
+        attachedCourseIds={courses.map((c) => c.course_id)}
+        onAttach={handleAttachCourses}
+        loading={loading}
+      />
     </section>
   );
 }