1 files changed, 123 insertions, 0 deletions
diff --git a/apps/web/src/timeline/placement/track-factory.ts b/apps/web/src/timeline/placement/track-factory.ts
new file mode 100644
index 00000000..9c69ea8c
--- /dev/null
+++ b/apps/web/src/timeline/placement/track-factory.ts
@@ -0,0 +1,123 @@
+import { DEFAULT_TRACK_NAMES } from "@/timeline/tracks";
+import type {
+	AudioTrack,
+	EffectTrack,
+	GraphicTrack,
+	TextTrack,
+	TrackType,
+	TimelineTrack,
+	VideoTrack,
+} from "@/timeline";
+
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: "video";
+	name?: string;
+}): VideoTrack;
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: "text";
+	name?: string;
+}): TextTrack;
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: "audio";
+	name?: string;
+}): AudioTrack;
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: "graphic";
+	name?: string;
+}): GraphicTrack;
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: "effect";
+	name?: string;
+}): EffectTrack;
+
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: TrackType;
+	name?: string;
+}): TimelineTrack;
+export function buildEmptyTrack({
+	id,
+	type,
+	name,
+}: {
+	id: string;
+	type: TrackType;
+	name?: string;
+}): TimelineTrack {
+	const trackName = name ?? DEFAULT_TRACK_NAMES[type];
+
+	switch (type) {
+		case "video":
+			return {
+				id,
+				name: trackName,
+				type: "video",
+				elements: [],
+				hidden: false,
+				muted: false,
+			};
+		case "text":
+			return {
+				id,
+				name: trackName,
+				type: "text",
+				elements: [],
+				hidden: false,
+			};
+		case "graphic":
+			return {
+				id,
+				name: trackName,
+				type: "graphic",
+				elements: [],
+				hidden: false,
+			};
+		case "audio":
+			return {
+				id,
+				name: trackName,
+				type: "audio",
+				elements: [],
+				muted: false,
+			};
+		case "effect":
+			return {
+				id,
+				name: trackName,
+				type: "effect",
+				elements: [],
+				hidden: false,
+			};
+		default:
+			throw new Error(`Unsupported track type: ${type}`);
+	}
+}