1 files changed, 29 insertions, 0 deletions
diff --git a/apps/web/src/timeline/index.ts b/apps/web/src/timeline/index.ts
new file mode 100644
index 00000000..5ee079b1
--- /dev/null
+++ b/apps/web/src/timeline/index.ts
@@ -0,0 +1,29 @@
+import type { SceneTracks } from "./types";
+
+export * from "./types";
+export * from "./drag";
+export * from "./track-capabilities";
+export * from "./track-element-update";
+export * from "./element-utils";
+export * from "./audio-separation";
+export * from "./zoom-utils";
+export * from "./ruler-utils";
+export * from "./pixel-utils";
+
+export function calculateTotalDuration({
+	tracks,
+}: {
+	tracks: SceneTracks;
+}): number {
+	const orderedTracks = [...tracks.overlay, tracks.main, ...tracks.audio];
+	if (orderedTracks.length === 0) return 0;
+
+	const trackEndTimes = orderedTracks.map((track) =>
+		track.elements.reduce((maxEnd, element) => {
+			const elementEnd = element.startTime + element.duration;
+			return Math.max(maxEnd, elementEnd);
+		}, 0),
+	);
+
+	return Math.max(...trackEndTimes, 0);
+}