From 3e89d2998588f8e35c524e523ba2ee853f0f6475 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Mon, 20 Apr 2026 11:31:17 +0200
Subject: refactor: restructure files to their domains,  new preview overlay
 system, and dep graph

---
 apps/web/src/timeline/scenes.ts | 113 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 apps/web/src/timeline/scenes.ts

(limited to 'apps/web/src/timeline/scenes.ts')

diff --git a/apps/web/src/timeline/scenes.ts b/apps/web/src/timeline/scenes.ts
new file mode 100644
index 00000000..d48c943c
--- /dev/null
+++ b/apps/web/src/timeline/scenes.ts
@@ -0,0 +1,113 @@
+import type { TScene } from "@/timeline";
+import { generateUUID } from "@/utils/id";
+import { calculateTotalDuration } from "@/timeline";
+import { MAIN_TRACK_NAME } from "@/timeline/placement/main-track";
+
+export function getMainScene({ scenes }: { scenes: TScene[] }): TScene | null {
+	return scenes.find((scene) => scene.isMain) || null;
+}
+
+export function ensureMainScene({ scenes }: { scenes: TScene[] }): TScene[] {
+	const hasMain = scenes.some((scene) => scene.isMain);
+	if (!hasMain) {
+		const mainScene = buildDefaultScene({ name: "Main scene", isMain: true });
+		return [mainScene, ...scenes];
+	}
+	return scenes;
+}
+
+export function buildDefaultScene({
+	name,
+	isMain,
+}: {
+	name: string;
+	isMain: boolean;
+}): TScene {
+	return {
+		id: generateUUID(),
+		name,
+		isMain,
+		tracks: {
+			overlay: [],
+			main: {
+				id: generateUUID(),
+				name: MAIN_TRACK_NAME,
+				type: "video",
+				elements: [],
+				muted: false,
+				hidden: false,
+			},
+			audio: [],
+		},
+		bookmarks: [],
+		createdAt: new Date(),
+		updatedAt: new Date(),
+	};
+}
+
+export function canDeleteScene({ scene }: { scene: TScene }): {
+	canDelete: boolean;
+	reason?: string;
+} {
+	if (scene.isMain) {
+		return { canDelete: false, reason: "Cannot delete main scene" };
+	}
+	return { canDelete: true };
+}
+
+export function getFallbackSceneAfterDelete({
+	scenes,
+	deletedSceneId,
+	currentSceneId,
+}: {
+	scenes: TScene[];
+	deletedSceneId: string;
+	currentSceneId: string | null;
+}): TScene | null {
+	if (currentSceneId !== deletedSceneId) {
+		return scenes.find((s) => s.id === currentSceneId) || null;
+	}
+	return getMainScene({ scenes });
+}
+
+export function findCurrentScene({
+	scenes,
+	currentSceneId,
+}: {
+	scenes: TScene[];
+	currentSceneId: string;
+}): TScene | null {
+	return (
+		scenes.find((s) => s.id === currentSceneId) ||
+		getMainScene({ scenes }) ||
+		scenes[0] ||
+		null
+	);
+}
+
+export function getProjectDurationFromScenes({
+	scenes,
+}: {
+	scenes: TScene[];
+}): number {
+	const mainScene = getMainScene({ scenes }) ?? scenes[0] ?? null;
+	if (!mainScene?.tracks) {
+		return 0;
+	}
+
+	return calculateTotalDuration({ tracks: mainScene.tracks });
+}
+
+export function updateSceneInArray({
+	scenes,
+	sceneId,
+	updates,
+}: {
+	scenes: TScene[];
+	sceneId: string;
+	updates: Partial<TScene>;
+}): TScene[] {
+	return scenes.map((scene) =>
+		scene.id === sceneId ? { ...scene, ...updates } : scene,
+	);
+}
-- 
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