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import { Command } from "@/lib/commands/base-command";
import type { TimelineTrack } from "@/types/timeline";
import { generateUUID } from "@/utils/id";
import { EditorCore } from "@/core";
import { rippleShiftElements } from "@/lib/timeline";
export class SplitElementsCommand extends Command {
private savedState: TimelineTrack[] | null = null;
private rightSideElements: { trackId: string; elementId: string }[] = [];
private previousSelection: { trackId: string; elementId: string }[] = [];
constructor(
private elements: { trackId: string; elementId: string }[],
private splitTime: number,
private retainSide: "both" | "left" | "right" = "both",
private rippleEnabled = false,
) {
super();
}
getRightSideElements(): { trackId: string; elementId: string }[] {
return this.rightSideElements;
}
execute(): void {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
this.previousSelection = editor.selection.getSelectedElements();
this.rightSideElements = [];
const updatedTracks = this.savedState.map((track) => {
const elementsToSplit = this.elements.filter(
(target) => target.trackId === track.id,
);
if (elementsToSplit.length === 0) {
return track;
}
let leftVisibleDurationForRipple: number | null = null;
let elements = track.elements.flatMap((element) => {
const shouldSplit = elementsToSplit.some(
(target) => target.elementId === element.id,
);
if (!shouldSplit) {
return [element];
}
const effectiveStart = element.startTime;
const effectiveEnd = element.startTime + element.duration;
if (
this.splitTime <= effectiveStart ||
this.splitTime >= effectiveEnd
) {
return [element];
}
const relativeTime = this.splitTime - element.startTime;
const leftVisibleDuration = relativeTime;
const rightVisibleDuration = element.duration - relativeTime;
if (this.retainSide === "left") {
return [
{
...element,
duration: leftVisibleDuration,
trimEnd: element.trimEnd + rightVisibleDuration,
name: `${element.name} (left)`,
},
];
}
if (this.retainSide === "right") {
if (this.rippleEnabled && elementsToSplit.length === 1) {
leftVisibleDurationForRipple = leftVisibleDuration;
}
const newId = generateUUID();
this.rightSideElements.push({
trackId: track.id,
elementId: newId,
});
return [
{
...element,
id: newId,
startTime: this.splitTime,
duration: rightVisibleDuration,
trimStart: element.trimStart + leftVisibleDuration,
name: `${element.name} (right)`,
},
];
}
const secondElementId = generateUUID();
this.rightSideElements.push({
trackId: track.id,
elementId: secondElementId,
});
return [
{
...element,
duration: leftVisibleDuration,
trimEnd: element.trimEnd + rightVisibleDuration,
name: `${element.name} (left)`,
},
{
...element,
id: secondElementId,
startTime: this.splitTime,
duration: rightVisibleDuration,
trimStart: element.trimStart + leftVisibleDuration,
name: `${element.name} (right)`,
},
];
});
if (
this.rippleEnabled &&
leftVisibleDurationForRipple !== null
) {
elements = rippleShiftElements({
elements,
afterTime: this.splitTime,
shiftAmount: leftVisibleDurationForRipple,
});
}
return { ...track, elements } as typeof track;
});
editor.timeline.updateTracks(updatedTracks);
if (this.rightSideElements.length > 0) {
editor.selection.setSelectedElements({
elements: this.rightSideElements,
});
}
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
editor.selection.setSelectedElements({
elements: this.previousSelection,
});
}
}
}
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