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import type { TimelineElement, TimelineTrack } from "@/lib/timeline";
import { generateUUID } from "@/utils/id";
import { buildEmptyTrack } from "./track-factory";
import type { PlacementResult } from "./types";
export function applyPlacement({
tracks,
placementResult,
elements,
newTrackInsertIndexOverride,
}: {
tracks: TimelineTrack[];
placementResult: PlacementResult;
elements: TimelineElement[];
newTrackInsertIndexOverride?: number;
}): { updatedTracks: TimelineTrack[]; targetTrackId: string } | null {
if (placementResult.kind === "existingTrack") {
const targetTrack = tracks[placementResult.trackIndex];
if (!targetTrack) {
return null;
}
const updatedTracks = tracks.map((track, trackIndex) =>
trackIndex === placementResult.trackIndex
? {
...track,
elements: [...track.elements, ...elements],
}
: track,
) as TimelineTrack[];
return { updatedTracks, targetTrackId: targetTrack.id };
}
const newTrackId = generateUUID();
const newTrack = {
...buildEmptyTrack({ id: newTrackId, type: placementResult.trackType }),
elements,
} as TimelineTrack;
const insertIndex =
newTrackInsertIndexOverride ?? placementResult.insertIndex;
const updatedTracks = [...tracks];
updatedTracks.splice(insertIndex, 0, newTrack);
return { updatedTracks, targetTrackId: newTrackId };
}
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