From 7bf0984698e43b9aa2dd879f65951318ed410390 Mon Sep 17 00:00:00 2001
From: Maze <167211895+mazeincoding@users.noreply.github.com>
Date: Sat, 31 Jan 2026 00:20:04 +0100
Subject: codebase overhaul (#697)

---
 .../lib/commands/timeline/element/move-elements.ts | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 apps/web/src/lib/commands/timeline/element/move-elements.ts

(limited to 'apps/web/src/lib/commands/timeline/element/move-elements.ts')

diff --git a/apps/web/src/lib/commands/timeline/element/move-elements.ts b/apps/web/src/lib/commands/timeline/element/move-elements.ts
new file mode 100644
index 00000000..2d4f9236
--- /dev/null
+++ b/apps/web/src/lib/commands/timeline/element/move-elements.ts
@@ -0,0 +1,127 @@
+import { Command } from "@/lib/commands/base-command";
+import { EditorCore } from "@/core";
+import type {
+	TimelineTrack,
+	TimelineElement,
+	TrackType,
+} from "@/types/timeline";
+import {
+	buildEmptyTrack,
+	isMainTrack,
+	validateElementTrackCompatibility,
+} 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 movedElement: TimelineElement = {
+			...element,
+			startTime: this.newStartTime,
+		};
+
+		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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