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import { Command } from "@/lib/commands/base-command";
import { EditorCore } from "@/core";
import type {
TimelineTrack,
TimelineElement,
TrackType,
} from "@/types/timeline";
import {
buildEmptyTrack,
isMainTrack,
validateElementTrackCompatibility,
enforceMainTrackStart,
} from "@/lib/timeline/track-utils";
export class MoveElementCommand extends Command {
private savedState: TimelineTrack[] | null = null;
constructor(
private sourceTrackId: string,
private targetTrackId: string,
private elementId: string,
private newStartTime: number,
private createTrack?: { type: TrackType; index: number },
) {
super();
}
execute(): void {
const editor = EditorCore.getInstance();
this.savedState = editor.timeline.getTracks();
const sourceTrack = this.savedState.find(
(t) => t.id === this.sourceTrackId,
);
const element = sourceTrack?.elements.find(
(el) => el.id === this.elementId,
);
if (!sourceTrack || !element) {
console.error("Source track or element not found");
return;
}
let targetTrack = this.savedState.find((t) => t.id === this.targetTrackId);
let tracksToUpdate = this.savedState;
if (!targetTrack && this.createTrack) {
const newTrack = buildEmptyTrack({
id: this.targetTrackId,
type: this.createTrack.type,
});
tracksToUpdate = [...this.savedState];
tracksToUpdate.splice(this.createTrack.index, 0, newTrack);
targetTrack = newTrack;
}
if (!targetTrack) {
console.error("Target track not found");
return;
}
const validation = validateElementTrackCompatibility({
element,
track: targetTrack,
});
if (!validation.isValid) {
console.error(validation.errorMessage);
return;
}
const adjustedStartTime = enforceMainTrackStart({
tracks: tracksToUpdate,
targetTrackId: this.targetTrackId,
requestedStartTime: this.newStartTime,
excludeElementId: this.elementId,
});
const movedElement: TimelineElement = {
...element,
startTime: adjustedStartTime,
};
const isSameTrack = this.sourceTrackId === this.targetTrackId;
let updatedTracks = tracksToUpdate.map((track) => {
if (isSameTrack && track.id === this.sourceTrackId) {
return {
...track,
elements: track.elements.map((el) =>
el.id === this.elementId ? movedElement : el,
),
};
}
if (track.id === this.sourceTrackId) {
return {
...track,
elements: track.elements.filter((el) => el.id !== this.elementId),
};
}
if (track.id === this.targetTrackId) {
return {
...track,
elements: [...track.elements, movedElement],
};
}
return track;
}) as TimelineTrack[];
if (!isSameTrack) {
const sourceTrackAfterMove = updatedTracks.find(
(track) => track.id === this.sourceTrackId,
);
if (
sourceTrackAfterMove &&
sourceTrackAfterMove.elements.length === 0 &&
!isMainTrack(sourceTrackAfterMove)
) {
updatedTracks = updatedTracks.filter(
(track) => track.id !== this.sourceTrackId,
);
}
}
editor.timeline.updateTracks(updatedTracks);
}
undo(): void {
if (this.savedState) {
const editor = EditorCore.getInstance();
editor.timeline.updateTracks(this.savedState);
}
}
}
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