OpenCut/apps/web/src/lib/commands/timeline/element/update-element-start-time.ts

import { Command } from "@/lib/commands/base-command";
import type { TimelineTrack } from "@/types/timeline";
import { EditorCore } from "@/core";

export class UpdateElementStartTimeCommand extends Command {
	private savedState: TimelineTrack[] | null = null;

	constructor(
		private elements: { trackId: string; elementId: string }[],
		private startTime: number,
	) {
		super();
	}

	execute(): void {
		const editor = EditorCore.getInstance();
		this.savedState = editor.timeline.getTracks();

		const updatedTracks = this.savedState.map((track) => {
			const hasElementsToUpdate = this.elements.some(
				(el) => el.trackId === track.id,
			);

			if (!hasElementsToUpdate) {
				return track;
			}

			const newElements = track.elements.map((element) => {
				const shouldUpdate = this.elements.some(
					(el) => el.elementId === element.id && el.trackId === track.id,
				);
				return shouldUpdate
					? { ...element, startTime: Math.max(0, this.startTime) }
					: element;
			});
			return { ...track, elements: newElements } as typeof track;
		});

		editor.timeline.updateTracks(updatedTracks);
	}

	undo(): void {
		if (this.savedState) {
			const editor = EditorCore.getInstance();
			editor.timeline.updateTracks(this.savedState);
		}
	}
}