feat: autosave

frontend/src/app/canvas/CanvasMenubar.tsx

@@ -14,14 +14,18 @@ import {
 } from '@/components/ui/menubar'
 import { Kbd, KbdGroup } from '@/components/ui/kbd'
 import { usePlatform } from '@/app/kosmos/KosmosContext'
-import { ArrowLeft, ClipboardPaste, Copy, CopyPlus, Download, FolderOpen, Pencil, Redo2, Save, Undo2 } from 'lucide-react'
+import { ArrowLeft, CheckCircle2, CircleDot, ClipboardPaste, Copy, CopyPlus, Download, FolderOpen, Loader2, Pencil, Redo2, Save, Undo2 } from 'lucide-react'
 import { Input } from '@/components/ui/input'
+import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip'
+import type { SaveStatus } from '@/app/canvas/useCanvasGraph'
 
 export type CanvasMenubarProps = {
   onImport: () => void
   onExport: () => void
   onSave?: () => void
   canSave?: boolean
+  /** Shown next to project title: unsaved | saving | saved */
+  saveStatus?: SaveStatus
   undo: () => void
   redo: () => void
   canUndo: boolean
@@ -48,6 +52,7 @@ export function CanvasMenubar({
   onExport,
   onSave,
   canSave = true,
+  saveStatus = 'saved',
   undo,
   redo,
   canUndo,
@@ -68,8 +73,32 @@ export function CanvasMenubar({
 
   const [isRenamingProject, setIsRenamingProject] = useState(false)
   const [renameValue, setRenameValue] = useState('')
+  const [showSavedBriefly, setShowSavedBriefly] = useState(false)
   const renameInputRef = useRef<HTMLInputElement>(null)
   const ignoreNextBlurRef = useRef(false)
+  const savedBrieflyTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null)
+  const prevSaveStatusRef = useRef<SaveStatus>(saveStatus)
+
+  useEffect(() => {
+    if (prevSaveStatusRef.current === 'saving' && saveStatus === 'saved') {
+      setShowSavedBriefly(true)
+      if (savedBrieflyTimerRef.current) clearTimeout(savedBrieflyTimerRef.current)
+      savedBrieflyTimerRef.current = setTimeout(() => {
+        savedBrieflyTimerRef.current = null
+        setShowSavedBriefly(false)
+      }, 2500)
+    }
+    prevSaveStatusRef.current = saveStatus
+  }, [saveStatus])
+
+  useEffect(() => {
+    return () => {
+      if (savedBrieflyTimerRef.current) {
+        clearTimeout(savedBrieflyTimerRef.current)
+        savedBrieflyTimerRef.current = null
+      }
+    }
+  }, [])
 
   useEffect(() => {
     if (isRenamingProject) {
@@ -256,7 +285,7 @@ export function CanvasMenubar({
         </MenubarMenu>
       </Menubar>
       {projectId && (
-        <div className="absolute left-1/2 -translate-x-1/2 flex justify-center max-w-[40%] min-w-[120px]">
+        <div className="absolute left-1/2 -translate-x-1/2 flex items-center justify-center gap-2 max-w-[50%] min-w-[120px]">
           {isRenamingProject ? (
             <Input
               ref={renameInputRef}
@@ -277,9 +306,45 @@ export function CanvasMenubar({
               aria-label="Project name"
             />
           ) : (
+            <>
               <span className="pointer-events-none truncate text-sm font-medium text-foreground font-serif">
                 {projectName ?? 'Untitled'}
               </span>
+              <TooltipProvider delayDuration={300}>
+                <Tooltip>
+                  <TooltipTrigger asChild>
+                    <span
+                      className="shrink-0 flex items-center text-muted-foreground cursor-default"
+                      aria-live="polite"
+                      aria-label={
+                        saveStatus === 'saving'
+                          ? 'Saving'
+                          : saveStatus === 'unsaved'
+                            ? 'Unsaved changes'
+                            : 'All changes saved'
+                      }
+                    >
+                      {saveStatus === 'saving' && (
+                        <Loader2 className="size-3.5 animate-spin" aria-hidden />
+                      )}
+                      {saveStatus === 'unsaved' && (
+                        <CircleDot className="size-3.5" aria-hidden />
+                      )}
+                      {(saveStatus === 'saved' || showSavedBriefly) && (
+                        <CheckCircle2 className="size-3.5 text-muted-foreground/70" aria-hidden />
+                      )}
+                    </span>
+                  </TooltipTrigger>
+                  <TooltipContent side="bottom">
+                    {saveStatus === 'saving'
+                      ? 'Saving…'
+                      : saveStatus === 'unsaved'
+                        ? 'Unsaved changes'
+                        : 'All changes saved'}
+                  </TooltipContent>
+                </Tooltip>
+              </TooltipProvider>
+            </>
           )}
         </div>
       )}

frontend/src/app/canvas/CanvasPage.tsx

@@ -171,6 +171,7 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
     canRedo,
     setStateImmediate,
     save,
+    saveStatus,
   } = useCanvasGraph(projectId)
 
   const importInputRef = useRef<HTMLInputElement | null>(null)
@@ -628,6 +629,7 @@ export function CanvasPage({ projectId }: CanvasPageProps) {
             : undefined
         }
         canSave={Boolean(projectId)}
+        saveStatus={saveStatus}
         undo={undo}
         redo={redo}
         canUndo={canUndo}

frontend/src/app/canvas/useCanvasGraph.ts

@@ -1,38 +1,89 @@
 /**
  * Hook for canvas graph state and persistence. Wraps useGraphStateWithHistory
- * with initial graph from project storage (or example). Save is explicit via save().
+ * with initial graph from project storage (or example). Save is explicit via save();
- * Keeps CanvasPage focused on composition and layout.
+ * autosave runs on an interval (~10s) and saves when the graph has changed.
  */
 
-import { useCallback, useMemo, useRef } from 'react'
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { useGraphStateWithHistory } from '@/hooks/useGraphStateWithHistory'
 import { getInitialGraph } from '@/app/canvas/canvasGraphUtils'
+import { useCanvasStore } from '@/app/canvas/canvasStore'
 import { saveGraphToStorage, PROJECT_VERSION } from '@/app/pleroma/projectGraphStorage'
 import type { AppNode, AppEdge } from '@/lib/graph/nodeTypes'
 
+export type SaveStatus = 'saved' | 'unsaved' | 'saving'
+
 export type UseCanvasGraphResult = ReturnType<typeof useGraphStateWithHistory> & {
   /** Persist current nodes/edges to storage. No-op when projectId is missing. */
   save: () => void
+  /** For menubar: show "Unsaved changes" | "Saving…" | "All changes saved". */
+  saveStatus: SaveStatus
 }
 
+const AUTOSAVE_INTERVAL_MS = 10_000
+
 export function useCanvasGraph(projectId: string | undefined): UseCanvasGraphResult {
   const initialGraph = useMemo(() => getInitialGraph(projectId), [projectId])
   const result = useGraphStateWithHistory(initialGraph.nodes, initialGraph.edges)
   const { nodes, edges } = result
 
+  const storeNodes = useCanvasStore((s) => s.graph.nodes)
+  const storeEdges = useCanvasStore((s) => s.graph.edges)
+
   const nodesRef = useRef(nodes)
   const edgesRef = useRef(edges)
   nodesRef.current = nodes
   edgesRef.current = edges
 
-  const save = useCallback(() => {
+  const [isSaving, setIsSaving] = useState(false)
+  const lastSavedSnapshotRef = useRef(
+    JSON.stringify({ nodes: initialGraph.nodes, edges: initialGraph.edges })
+  )
+
+  const serializedFromStore = useMemo(
+    () => JSON.stringify({ nodes: storeNodes, edges: storeEdges }),
+    [storeNodes, storeEdges]
+  )
+  const isDirty = serializedFromStore !== lastSavedSnapshotRef.current
+  const saveStatus: SaveStatus = isSaving ? 'saving' : isDirty ? 'unsaved' : 'saved'
+
+  const performSave = useCallback(() => {
     if (!projectId) return
+    const current = JSON.stringify({
+      nodes: nodesRef.current,
+      edges: edgesRef.current,
+    })
+    if (current === lastSavedSnapshotRef.current) return
+    setIsSaving(true)
     saveGraphToStorage(projectId, {
       version: PROJECT_VERSION,
       nodes: nodesRef.current,
       edges: edgesRef.current,
     })
+    lastSavedSnapshotRef.current = current
+    setIsSaving(false)
   }, [projectId])
 
-  return { ...result, save }
+  const save = useCallback(() => {
+    if (!projectId) return
+    setIsSaving(true)
+    saveGraphToStorage(projectId, {
+      version: PROJECT_VERSION,
+      nodes: nodesRef.current,
+      edges: edgesRef.current,
+    })
+    lastSavedSnapshotRef.current = JSON.stringify({
+      nodes: nodesRef.current,
+      edges: edgesRef.current,
+    })
+    setIsSaving(false)
+  }, [projectId])
+
+  useEffect(() => {
+    if (!projectId) return
+    const id = setInterval(performSave, AUTOSAVE_INTERVAL_MS)
+    return () => clearInterval(id)
+  }, [projectId, performSave])
+
+  return { ...result, save, saveStatus }
 }