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import type { SerializedProject } from "@/services/storage/types";
function isRecord(value: unknown): value is Record<string, unknown> {
return typeof value === "object" && value !== null && !Array.isArray(value);
}
function collectFromElements({
elements,
mediaIds,
}: {
elements: unknown;
mediaIds: Set<string>;
}): void {
if (!Array.isArray(elements)) return;
for (const element of elements) {
if (!isRecord(element)) continue;
if (typeof element.mediaId === "string" && element.mediaId.length > 0) {
mediaIds.add(element.mediaId);
}
}
}
/**
* Extracts every media asset id referenced by a serialized project's scenes.
* Duck-typed (like migrations) so snapshots of any project version scan safely.
*/
export function getReferencedMediaIds({
project,
}: {
project: SerializedProject;
}): Set<string> {
const mediaIds = new Set<string>();
for (const scene of project.scenes ?? []) {
const tracks: unknown = scene.tracks;
if (!isRecord(tracks)) continue;
if (isRecord(tracks.main)) {
collectFromElements({ elements: tracks.main.elements, mediaIds });
}
for (const list of [tracks.overlay, tracks.audio]) {
if (!Array.isArray(list)) continue;
for (const track of list) {
if (!isRecord(track)) continue;
collectFromElements({ elements: track.elements, mediaIds });
}
}
}
return mediaIds;
}
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