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import { Command, type CommandResult } from "@/lib/commands/base-command";
import type { TimelineTrack } from "@/lib/timeline";
import { EditorCore } from "@/core";
import { enforceMainTrackStart } from "@/lib/timeline/placement";
export class UpdateElementStartTimeCommand extends Command {
private savedState: TimelineTrack[] | null = null;
private readonly elements: { trackId: string; elementId: string }[];
private readonly startTime: number;
constructor({
elements,
startTime,
}: {
elements: { trackId: string; elementId: string }[];
startTime: number;
}) {
super();
this.elements = elements;
this.startTime = startTime;
}
execute(): CommandResult | undefined {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
const currentTracks = this.savedState;
const updatedTracks = currentTracks.map((track) => {
const hasElementsToUpdate = this.elements.some(
(elementEntry) => elementEntry.trackId === track.id,
);
if (!hasElementsToUpdate) {
return track;
}
const newElements = track.elements.map((element) => {
const shouldUpdate = this.elements.some(
(elementEntry) =>
elementEntry.elementId === element.id &&
elementEntry.trackId === track.id,
);
if (!shouldUpdate) {
return element;
}
const baseStartTime = Math.max(0, this.startTime);
const adjustedStartTime = enforceMainTrackStart({
tracks: currentTracks,
targetTrackId: track.id,
requestedStartTime: baseStartTime,
excludeElementId: element.id,
});
return { ...element, startTime: adjustedStartTime };
});
return { ...track, elements: newElements } as typeof track;
});
editor.timeline.updateTracks(updatedTracks);
return undefined;
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
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