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import type { TimelineTrack } from "@/lib/timeline/types";
import { rippleShiftElements } from "./shift";
export interface RippleAdjustment {
trackId: string;
afterTime: number;
shiftAmount: number;
}
export function applyRippleAdjustments({
tracks,
adjustments,
}: {
tracks: TimelineTrack[];
adjustments: RippleAdjustment[];
}): TimelineTrack[] {
if (adjustments.length === 0) {
return tracks;
}
const adjustmentsByTrack = new Map<string, RippleAdjustment[]>();
for (const adjustment of adjustments) {
const trackAdjustments = adjustmentsByTrack.get(adjustment.trackId) ?? [];
trackAdjustments.push(adjustment);
adjustmentsByTrack.set(adjustment.trackId, trackAdjustments);
}
return tracks.map((track) =>
applyTrackRippleAdjustments({
track,
adjustments: adjustmentsByTrack.get(track.id) ?? [],
}),
);
}
function applyTrackRippleAdjustments<
TElement extends TimelineTrack["elements"][number],
TTrack extends TimelineTrack & { elements: TElement[] },
>({
track,
adjustments,
}: {
track: TTrack;
adjustments: RippleAdjustment[];
}): TTrack {
if (adjustments.length === 0) {
return track;
}
const sortedAdjustments = [...adjustments].sort(
(firstAdjustment, secondAdjustment) =>
secondAdjustment.afterTime - firstAdjustment.afterTime,
);
let elements: TElement[] = track.elements;
for (const adjustment of sortedAdjustments) {
elements = rippleShiftElements({
elements,
afterTime: adjustment.afterTime,
shiftAmount: adjustment.shiftAmount,
});
}
return { ...track, elements };
}
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