refactor: split presets into data definitions and storage store

5 files changed, 129 insertions, 103 deletions

diff --git a/apps/web/src/components/editor/panels/timeline/graph-editor/custom-presets-store.ts b/apps/web/src/components/editor/panels/timeline/graph-editor/custom-presets-store.ts
new file mode 100644
index 00000000..54722ec2
--- /dev/null
+++ b/apps/web/src/components/editor/panels/timeline/graph-editor/custom-presets-store.ts
@@ -0,0 +1,101 @@
+"use client";
+
+import { useSyncExternalStore } from "react";
+import { generateUUID } from "@/utils/id";
+import type { NormalizedCubicBezier } from "@/lib/animation/types";
+import type { EasingPreset } from "./easing-presets";
+
+const STORAGE_KEY = "opencut:graph-editor-presets";
+
+let cachedPresets: EasingPreset[] | null = null;
+const listeners = new Set<() => void>();
+
+function isValidPresetArray(value: unknown): value is EasingPreset[] {
+	return (
+		Array.isArray(value) &&
+		value.every(
+			(item) =>
+				typeof item === "object" &&
+				item !== null &&
+				typeof item.id === "string" &&
+				typeof item.label === "string" &&
+				Array.isArray(item.value) &&
+				item.value.length === 4 &&
+				item.value.every((number: unknown) => typeof number === "number"),
+		)
+	);
+}
+
+function readFromStorage(): EasingPreset[] {
+	try {
+		const raw = localStorage.getItem(STORAGE_KEY);
+		if (!raw) return [];
+		const parsed: unknown = JSON.parse(raw);
+		return isValidPresetArray(parsed) ? parsed : [];
+	} catch {
+		// Silently recover — corrupted localStorage shouldn't crash the editor
+		return [];
+	}
+}
+
+function writeToStorage({ presets }: { presets: EasingPreset[] }): void {
+	localStorage.setItem(STORAGE_KEY, JSON.stringify(presets));
+}
+
+function getSnapshot(): EasingPreset[] {
+	cachedPresets ??= readFromStorage();
+	return cachedPresets;
+}
+
+function getServerSnapshot(): EasingPreset[] {
+	return [];
+}
+
+function notify(): void {
+	cachedPresets = null;
+	for (const listener of listeners) {
+		listener();
+	}
+}
+
+function onStorageChange(event: StorageEvent): void {
+	if (event.key === STORAGE_KEY) notify();
+}
+
+function subscribe(listener: () => void): () => void {
+	if (listeners.size === 0 && typeof window !== "undefined") {
+		window.addEventListener("storage", onStorageChange);
+	}
+	listeners.add(listener);
+	return () => {
+		listeners.delete(listener);
+		if (listeners.size === 0 && typeof window !== "undefined") {
+			window.removeEventListener("storage", onStorageChange);
+		}
+	};
+}
+
+export function useCustomPresets(): EasingPreset[] {
+	return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
+}
+
+export function savePreset({ value }: { value: NormalizedCubicBezier }): void {
+	const current = getSnapshot();
+	writeToStorage({
+		presets: [
+			...current,
+			{
+				id: generateUUID(),
+				label: `Custom ${current.length + 1}`,
+				value,
+				isCustom: true,
+			},
+		],
+	});
+	notify();
+}
+
+export function removePreset({ id }: { id: string }): void {
+	writeToStorage({ presets: getSnapshot().filter((preset) => preset.id !== id) });
+	notify();
+}
diff --git a/apps/web/src/components/editor/panels/timeline/graph-editor/easing-presets.ts b/apps/web/src/components/editor/panels/timeline/graph-editor/easing-presets.ts
new file mode 100644
index 00000000..6ccc9071
--- /dev/null
+++ b/apps/web/src/components/editor/panels/timeline/graph-editor/easing-presets.ts
@@ -0,0 +1,19 @@
+import type { NormalizedCubicBezier } from "@/lib/animation/types";
+
+export const PRESET_MATCH_TOLERANCE = 0.02;
+
+export interface EasingPreset {
+	id: string;
+	label: string;
+	value: NormalizedCubicBezier;
+	isCustom?: boolean;
+}
+
+export const BUILTIN_PRESETS: EasingPreset[] = [
+	{ id: "smooth", label: "Smooth", value: [0.25, 0.1, 0.25, 1] },
+	{ id: "ease-out", label: "Ease out", value: [0, 0, 0.2, 1] },
+	{ id: "ease-in", label: "Ease in", value: [0.8, 0, 1, 1] },
+	{ id: "ease-in-out", label: "In out", value: [0.4, 0, 0.2, 1] },
+	{ id: "pop", label: "Pop", value: [0.175, 0.885, 0.32, 1.275] },
+	{ id: "linear", label: "Linear", value: [0, 0, 1, 1] },
+];
diff --git a/apps/web/src/components/editor/panels/timeline/graph-editor/popover.tsx b/apps/web/src/components/editor/panels/timeline/graph-editor/popover.tsx
index 86665392..00348a60 100644
--- a/apps/web/src/components/editor/panels/timeline/graph-editor/popover.tsx
+++ b/apps/web/src/components/editor/panels/timeline/graph-editor/popover.tsx
@@ -17,11 +17,9 @@ import type { GraphEditorComponentOption } from "./session";
 import {
 	BUILTIN_PRESETS,
 	PRESET_MATCH_TOLERANCE,
-	removePreset,
-	savePreset,
 	type EasingPreset,
-	useCustomPresets,
-} from "./presets";
+} from "./easing-presets";
+import { removePreset, savePreset, useCustomPresets } from "./custom-presets-store";
 import { BezierGraph, BEZIER_GRAPH_MIN_HEIGHT } from "./bezier-graph";
 
 const COLLAPSED_MAX = 6;
@@ -160,12 +158,12 @@ export function GraphEditorPopover({
 									isActive={activePresetId === preset.id}
 									disabled={!canEdit}
 									onSelect={() => onCommitValue?.(preset.value)}
-									onDelete={() => removePreset(preset.id)}
+									onDelete={() => removePreset({ id: preset.id })}
 								/>
 							))}
 							<button
 								type="button"
-								onClick={() => value && savePreset(value)}
+								onClick={() => value && savePreset({ value })}
 								disabled={!canEdit}
 								className={cn(
 									"text-muted-foreground flex flex-col items-center justify-center gap-1 rounded-sm px-1 py-1",
diff --git a/apps/web/src/components/editor/panels/timeline/graph-editor/presets.ts b/apps/web/src/components/editor/panels/timeline/graph-editor/presets.ts
deleted file mode 100644
index cbcdf566..00000000
--- a/apps/web/src/components/editor/panels/timeline/graph-editor/presets.ts
+++ /dev/null
@@ -1,90 +0,0 @@
-"use client";
-
-import { useSyncExternalStore } from "react";
-import type { NormalizedCubicBezier } from "@/lib/animation/types";
-
-const STORAGE_KEY = "opencut:graph-editor-presets";
-export const PRESET_MATCH_TOLERANCE = 0.02;
-
-export interface EasingPreset {
-	id: string;
-	label: string;
-	value: NormalizedCubicBezier;
-	isCustom?: boolean;
-}
-
-export const BUILTIN_PRESETS: EasingPreset[] = [
-	{ id: "smooth", label: "Smooth", value: [0.25, 0.1, 0.25, 1] },
-	{ id: "ease-out", label: "Ease out", value: [0, 0, 0.2, 1] },
-	{ id: "ease-in", label: "Ease in", value: [0.8, 0, 1, 1] },
-	{ id: "ease-in-out", label: "In out", value: [0.4, 0, 0.2, 1] },
-	{ id: "pop", label: "Pop", value: [0.175, 0.885, 0.32, 1.275] },
-	{ id: "linear", label: "Linear", value: [0, 0, 1, 1] },
-];
-
-let cachedPresets: EasingPreset[] | null = null;
-const listeners = new Set<() => void>();
-
-function readFromStorage(): EasingPreset[] {
-	try {
-		const raw = localStorage.getItem(STORAGE_KEY);
-		// JSON.parse can throw if the stored value is corrupted
-		return raw ? (JSON.parse(raw) as EasingPreset[]) : [];
-	} catch {
-		return [];
-	}
-}
-
-function writeToStorage(presets: EasingPreset[]): void {
-	localStorage.setItem(STORAGE_KEY, JSON.stringify(presets));
-}
-
-function getSnapshot(): EasingPreset[] {
-	cachedPresets ??= readFromStorage();
-	return cachedPresets;
-}
-
-function getServerSnapshot(): EasingPreset[] {
-	return [];
-}
-
-function notify(): void {
-	cachedPresets = null;
-	for (const listener of listeners) {
-		listener();
-	}
-}
-
-function subscribe(listener: () => void): () => void {
-	listeners.add(listener);
-	return () => listeners.delete(listener);
-}
-
-if (typeof window !== "undefined") {
-	window.addEventListener("storage", (event) => {
-		if (event.key === STORAGE_KEY) notify();
-	});
-}
-
-export function useCustomPresets(): EasingPreset[] {
-	return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot);
-}
-
-export function savePreset(value: NormalizedCubicBezier): void {
-	const current = getSnapshot();
-	writeToStorage([
-		...current,
-		{
-			id: `custom-${Date.now()}`,
-			label: `Custom ${current.length + 1}`,
-			value,
-			isCustom: true,
-		},
-	]);
-	notify();
-}
-
-export function removePreset(id: string): void {
-	writeToStorage(getSnapshot().filter((preset) => preset.id !== id));
-	notify();
-}
diff --git a/apps/web/src/components/editor/panels/timeline/graph-editor/session.ts b/apps/web/src/components/editor/panels/timeline/graph-editor/session.ts
index 148fa7b4..9c81215d 100644
--- a/apps/web/src/components/editor/panels/timeline/graph-editor/session.ts
+++ b/apps/web/src/components/editor/panels/timeline/graph-editor/session.ts
@@ -1,5 +1,3 @@
-"use client";
-
 import {
 	getCurveHandlesForNormalizedCubicBezier,
 	getEditableScalarChannels,
@@ -22,7 +20,7 @@ const FLAT_VALUE_EPSILON = 1e-6;
 const LINEAR_CURVE_EPSILON = 1e-6;
 
 export type GraphEditorUnavailableReason =
-	| "no-keyframe-selected"
+	| "no-keyframe-selected"	
 	| "multiple-keyframes-selected"
 	| "selected-element-missing"
 	| "selected-element-has-no-animations"
@@ -201,11 +199,11 @@ export function resolveGraphEditorSelectionState({
 	}
 
 	if (selectedKeyframes.length === 2) {
-		const [kf1, kf2] = selectedKeyframes;
+		const [firstKeyframe, secondKeyframe] = selectedKeyframes;
 		if (
-			kf1.trackId !== kf2.trackId ||
-			kf1.elementId !== kf2.elementId ||
-			kf1.propertyPath !== kf2.propertyPath
+			firstKeyframe.trackId !== secondKeyframe.trackId ||
+			firstKeyframe.elementId !== secondKeyframe.elementId ||
+			firstKeyframe.propertyPath !== secondKeyframe.propertyPath
 		) {
 			return createUnavailableState({
 				reason: "multiple-keyframes-selected",