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import { Command } from "@/lib/commands/base-command";
import type { TimelineTrack } from "@/lib/timeline";
import { EditorCore } from "@/core";
import { isMainTrack, rippleShiftElements } from "@/lib/timeline";
export class DeleteElementsCommand extends Command {
private savedState: TimelineTrack[] | null = null;
private readonly elements: { trackId: string; elementId: string }[];
private readonly rippleEnabled: boolean;
constructor({
elements,
rippleEnabled = false,
}: {
elements: { trackId: string; elementId: string }[];
rippleEnabled?: boolean;
}) {
super();
this.elements = elements;
this.rippleEnabled = rippleEnabled;
}
execute(): void {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
const updatedTracks = this.savedState
.map((track) => {
const elementsToDeleteOnTrack = this.elements.filter(
(target) => target.trackId === track.id,
);
const hasElementsToDelete = elementsToDeleteOnTrack.length > 0;
if (!hasElementsToDelete) {
return track;
}
const deletedElementInfos = elementsToDeleteOnTrack
.map((target) =>
track.elements.find((element) => element.id === target.elementId),
)
.filter((element): element is NonNullable<typeof element> => element !== undefined)
.map((element) => ({ startTime: element.startTime, duration: element.duration }));
let elements = track.elements.filter(
(element) =>
!this.elements.some(
(target) =>
target.trackId === track.id && target.elementId === element.id,
),
);
if (this.rippleEnabled && deletedElementInfos.length > 0) {
const sortedByStartDesc = [...deletedElementInfos].sort(
(a, b) => b.startTime - a.startTime,
);
for (const { startTime, duration } of sortedByStartDesc) {
elements = rippleShiftElements({
elements,
afterTime: startTime,
shiftAmount: duration,
});
}
}
return { ...track, elements } as typeof track;
})
.filter((track) => track.elements.length > 0 || isMainTrack(track));
editor.timeline.updateTracks(updatedTracks);
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
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