feat: add note version history and restore (#note-history)

Co-authored-by: fredicious <1580688+fredicious@users.noreply.github.com>

src/lib/components/NoteEditor.svelte

@@ -5,6 +5,7 @@
 	import TiptapEditor from './TiptapEditor.svelte';
 	import ImageUpload from './ImageUpload.svelte';
 	import ShareDialog from './ShareDialog.svelte';
+	import NoteHistory from './NoteHistory.svelte';
 	import { updateNote, createNote } from '$lib/stores/notes.js';
 	import { notes } from '$lib/stores/notes.js';
 	import { NOTE_COLORS } from '$lib/utils/colors.js';
@@ -19,6 +20,7 @@
 	import FileText from 'lucide-svelte/icons/file-text';
 	import UserPlus from 'lucide-svelte/icons/user-plus';
 	import Users from 'lucide-svelte/icons/users';
+	import History from 'lucide-svelte/icons/history';
 
 	interface Props {
 		note: Note | null;
@@ -55,6 +57,7 @@
 	let attachmentsList = $state<Attachment[]>(note?.attachments ?? []);
 
 	let showShareDialog = $state(false);
+	let showHistory = $state(false);
 	// svelte-ignore state_referenced_locally
 	let collaboratorsList = $state<Collaborator[]>(note?.collaborators ?? []);
 	const isOwner = $derived(note?.isOwner !== false);
@@ -84,6 +87,37 @@
 		showShareDialog = !showShareDialog;
 	}
 
+	async function toggleHistory() {
+		if (currentlyNew) {
+			const id = await autoSave();
+			if (!id) return;
+		}
+		showHistory = !showHistory;
+	}
+
+	async function handleHistoryRestored() {
+		if (!noteId) return;
+		// Reload the note content from the server after a restore
+		try {
+			const res = await fetch(`/api/notes/${noteId}`);
+			if (res.ok) {
+				const updated = await res.json();
+				title = updated.title ?? '';
+				content = updated.content ?? '';
+				color = updated.color ?? 'default';
+				checklistMode = updated.checklistMode ?? false;
+				// Bump editor tick to force TiptapEditor to re-render
+				editorTick++;
+				// Update the store too
+				notes.update((list) =>
+					list.map((n) => (n.id === noteId ? { ...n, ...updated } : n))
+				);
+			}
+		} catch {
+			// failed silently
+		}
+	}
+
 	// Fetch attachments for existing notes if not pre-populated (e.g. loaded from IDB)
 	$effect(() => {
 		if (noteId && !currentlyNew && (!note?.attachments || note.attachments.length === 0)) {
@@ -381,6 +415,18 @@
 						<Users class="h-5 w-5" />
 					</span>
 				{/if}
+
+				<!-- History button (only for saved notes) -->
+				{#if !currentlyNew}
+					<button
+						onclick={toggleHistory}
+						class="rounded-sm p-2 hover:bg-[var(--border)]/10"
+						title="Version history"
+						data-testid="history-toggle"
+					>
+						<History class="h-5 w-5 {showHistory ? 'text-[var(--primary)]' : ''}" />
+					</button>
+				{/if}
 			</div>
 
 			<button
@@ -403,3 +449,11 @@
 		onUpdate={handleCollaboratorsUpdate}
 	/>
 {/if}
+
+{#if showHistory && noteId}
+	<NoteHistory
+		noteId={noteId}
+		onClose={() => (showHistory = false)}
+		onRestored={handleHistoryRestored}
+	/>
+{/if}

src/lib/components/NoteHistory.svelte

@@ -0,0 +1,222 @@
+<script lang="ts">
+	import type { NoteVersionSummary, NoteVersion } from '$lib/types/index.js';
+	import X from 'lucide-svelte/icons/x';
+	import RotateCcw from 'lucide-svelte/icons/rotate-ccw';
+	import Clock from 'lucide-svelte/icons/clock';
+	import { showToast } from '$lib/stores/toast.js';
+
+	interface Props {
+		noteId: string;
+		onClose: () => void;
+		onRestored: () => void;
+	}
+
+	const { noteId, onClose, onRestored }: Props = $props();
+
+	let versions = $state<NoteVersionSummary[]>([]);
+	let selectedVersion = $state<NoteVersion | null>(null);
+	let isLoading = $state(true);
+	let isLoadingVersion = $state(false);
+	let isRestoring = $state(false);
+	let showConfirm = $state(false);
+
+	$effect(() => {
+		void loadVersions();
+	});
+
+	async function loadVersions() {
+		isLoading = true;
+		try {
+			const res = await fetch(`/api/notes/${noteId}/versions`);
+			if (res.ok) {
+				versions = await res.json();
+			}
+		} catch {
+			// failed silently
+		} finally {
+			isLoading = false;
+		}
+	}
+
+	async function selectVersion(versionId: string) {
+		isLoadingVersion = true;
+		selectedVersion = null;
+		try {
+			const res = await fetch(`/api/notes/${noteId}/versions/${versionId}`);
+			if (res.ok) {
+				selectedVersion = await res.json();
+			}
+		} catch {
+			// failed silently
+		} finally {
+			isLoadingVersion = false;
+		}
+	}
+
+	async function restoreVersion() {
+		if (!selectedVersion) return;
+		isRestoring = true;
+		try {
+			const res = await fetch(
+				`/api/notes/${noteId}/versions/${selectedVersion.id}/restore`,
+				{ method: 'POST' }
+			);
+			if (res.ok) {
+				showToast('Version restored successfully', 'success');
+				onRestored();
+				onClose();
+			} else {
+				showToast('Failed to restore version', 'error');
+			}
+		} catch {
+			showToast('Failed to restore version', 'error');
+		} finally {
+			isRestoring = false;
+			showConfirm = false;
+		}
+	}
+
+	function formatDate(date: Date | string): string {
+		const d = new Date(date);
+		const now = new Date();
+		const diffMs = now.getTime() - d.getTime();
+		const diffMins = Math.floor(diffMs / 60000);
+		const diffHours = Math.floor(diffMins / 60);
+		const diffDays = Math.floor(diffHours / 24);
+
+		if (diffMins < 1) return 'Just now';
+		if (diffMins < 60) return `${diffMins} minute${diffMins === 1 ? '' : 's'} ago`;
+		if (diffHours < 24) return `${diffHours} hour${diffHours === 1 ? '' : 's'} ago`;
+		if (diffDays < 7) return `${diffDays} day${diffDays === 1 ? '' : 's'} ago`;
+		return d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' });
+	}
+</script>
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+	class="fixed inset-0 z-50 flex items-start justify-center overflow-y-auto bg-black/50 pt-20 pb-10"
+	onkeydown={(e) => { if (e.key === 'Escape') onClose(); }}
+	onclick={(e) => { if (e.target === e.currentTarget) onClose(); }}
+	data-testid="history-overlay"
+>
+	<!-- svelte-ignore a11y_no_static_element_interactions -->
+	<div
+		class="mx-4 flex w-full max-w-2xl flex-col overflow-hidden rounded-sm border border-[var(--border)] bg-[var(--bg-surface)] shadow-[var(--card-shadow)]"
+		onclick={(e) => e.stopPropagation()}
+		onkeydown={(e) => e.stopPropagation()}
+		data-testid="history-panel"
+	>
+		<!-- Header -->
+		<div class="flex items-center justify-between border-b border-[var(--border-subtle)] px-4 py-3">
+			<div class="flex items-center gap-2">
+				<Clock class="h-4 w-4 text-[var(--text-muted)]" />
+				<h2 class="text-sm font-semibold text-[var(--text)]">Version History</h2>
+			</div>
+			<button
+				onclick={onClose}
+				class="rounded-sm p-1 hover:bg-[var(--border)]/10"
+				title="Close history"
+				data-testid="close-history-btn"
+			>
+				<X class="h-4 w-4 text-[var(--text-muted)]" />
+			</button>
+		</div>
+
+		<div class="flex min-h-0 flex-1">
+			<!-- Version list -->
+			<div class="w-56 flex-none border-r border-[var(--border-subtle)] overflow-y-auto max-h-[60vh]">
+				{#if isLoading}
+					<div class="flex items-center justify-center py-8 text-sm text-[var(--text-muted)]">
+						Loading…
+					</div>
+				{:else if versions.length === 0}
+					<div class="flex items-center justify-center py-8 text-sm text-[var(--text-muted)]">
+						No history yet
+					</div>
+				{:else}
+					<ul class="divide-y divide-[var(--border-subtle)]">
+						{#each versions as v (v.id)}
+							<li>
+								<button
+									class="w-full px-3 py-3 text-left hover:bg-[var(--border)]/10 transition-colors {selectedVersion?.id === v.id ? 'bg-[var(--primary)]/10 border-l-2 border-[var(--primary)]' : ''}"
+									onclick={() => selectVersion(v.id)}
+									data-testid="version-item"
+								>
+									<div class="flex items-center justify-between gap-1">
+										<span class="text-xs font-semibold text-[var(--primary)]">v{v.version}</span>
+									</div>
+									<div class="mt-0.5 text-xs text-[var(--text-muted)]">{formatDate(v.createdAt)}</div>
+									{#if v.title}
+										<div class="mt-1 truncate text-xs font-medium text-[var(--text)]">{v.title}</div>
+									{/if}
+									{#if v.contentPreview}
+										<div class="mt-0.5 line-clamp-2 text-xs text-[var(--text-muted)]">{v.contentPreview}</div>
+									{/if}
+								</button>
+							</li>
+						{/each}
+					</ul>
+				{/if}
+			</div>
+
+			<!-- Version preview -->
+			<div class="flex min-w-0 flex-1 flex-col">
+				{#if isLoadingVersion}
+					<div class="flex items-center justify-center py-8 text-sm text-[var(--text-muted)]">
+						Loading…
+					</div>
+				{:else if selectedVersion}
+					<div class="flex flex-1 flex-col overflow-y-auto max-h-[60vh]">
+						<div class="flex-1 overflow-y-auto px-4 py-3">
+							{#if selectedVersion.title}
+								<h3 class="mb-2 text-base font-semibold text-[var(--text)]">{selectedVersion.title}</h3>
+							{/if}
+							<pre class="whitespace-pre-wrap text-sm text-[var(--text)] font-[inherit]">{selectedVersion.content || '(empty)'}</pre>
+						</div>
+
+						<!-- Restore footer -->
+						<div class="border-t border-[var(--border-subtle)] px-4 py-3">
+							{#if showConfirm}
+								<div class="flex flex-col gap-2">
+									<p class="text-xs text-[var(--text-muted)]">
+										This will replace the current note. The current version will be saved as a snapshot.
+									</p>
+									<div class="flex gap-2">
+										<button
+											onclick={restoreVersion}
+											disabled={isRestoring}
+											class="flex items-center gap-1.5 rounded-sm border border-[var(--destructive)] bg-[var(--destructive)] px-3 py-1.5 text-xs font-medium text-white hover:opacity-90 disabled:opacity-50"
+											data-testid="confirm-restore-btn"
+										>
+											<RotateCcw class="h-3.5 w-3.5" />
+											{isRestoring ? 'Restoring…' : 'Confirm Restore'}
+										</button>
+										<button
+											onclick={() => (showConfirm = false)}
+											class="rounded-sm border border-[var(--border-subtle)] px-3 py-1.5 text-xs font-medium text-[var(--text)] hover:bg-[var(--border)]/10"
+										>
+											Cancel
+										</button>
+									</div>
+								</div>
+							{:else}
+								<button
+									onclick={() => (showConfirm = true)}
+									class="flex items-center gap-1.5 rounded-sm border border-[var(--border-subtle)] px-3 py-1.5 text-xs font-medium text-[var(--text)] hover:border-[var(--primary)] hover:text-[var(--primary)] transition-colors"
+									data-testid="restore-btn"
+								>
+									<RotateCcw class="h-3.5 w-3.5" />
+									Restore this version
+								</button>
+							{/if}
+						</div>
+					</div>
+				{:else}
+					<div class="flex items-center justify-center py-8 text-sm text-[var(--text-muted)]">
+						Select a version to preview
+					</div>
+				{/if}
+			</div>
+		</div>
+	</div>
+</div>