From eea6d43c82e1fd09d94d73001090dad205b1f1d2 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Sun, 26 Apr 2026 02:50:04 +0200
Subject: fix: model editor time as wasm MediaTime ticks end-to-end

---
 .../src/timeline/__tests__/update-pipeline.test.ts | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 apps/web/src/timeline/__tests__/update-pipeline.test.ts

(limited to 'apps/web/src/timeline/__tests__')

diff --git a/apps/web/src/timeline/__tests__/update-pipeline.test.ts b/apps/web/src/timeline/__tests__/update-pipeline.test.ts
new file mode 100644
index 00000000..94b32ced
--- /dev/null
+++ b/apps/web/src/timeline/__tests__/update-pipeline.test.ts
@@ -0,0 +1,66 @@
+import { describe, expect, test } from "bun:test";
+import type { Transform } from "@/rendering";
+import type { SceneTracks, VideoElement } from "@/timeline";
+import { applyElementUpdate } from "@/timeline/update-pipeline";
+import { mediaTime, ZERO_MEDIA_TIME } from "@/wasm";
+
+function buildTransform(): Transform {
+	return {
+		scaleX: 1,
+		scaleY: 1,
+		position: { x: 0, y: 0 },
+		rotate: 0,
+	};
+}
+
+function buildVideoElement(overrides: Partial<VideoElement> = {}): VideoElement {
+	return {
+		id: "video-1",
+		type: "video",
+		name: "Video 1",
+		startTime: ZERO_MEDIA_TIME,
+		duration: mediaTime({ ticks: 10 }),
+		trimStart: ZERO_MEDIA_TIME,
+		trimEnd: ZERO_MEDIA_TIME,
+		mediaId: "media-1",
+		transform: buildTransform(),
+		opacity: 1,
+		...overrides,
+	};
+}
+
+function buildTracks(element: VideoElement): SceneTracks {
+	return {
+		overlay: [],
+		main: {
+			id: "main-track",
+			type: "video",
+			name: "Main",
+			muted: false,
+			hidden: false,
+			elements: [element],
+		},
+		audio: [],
+	};
+}
+
+describe("applyElementUpdate", () => {
+	test("rounds retimed durations back to integer media time", () => {
+		const element = buildVideoElement();
+		const tracks = buildTracks(element);
+
+		const updatedElement = applyElementUpdate({
+			element,
+			patch: {
+				retime: { rate: 1.5 },
+			},
+			context: {
+				tracks,
+				trackId: tracks.main.id,
+			},
+		});
+
+		expect(updatedElement.duration).toBe(7);
+		expect(Number.isInteger(updatedElement.duration)).toBe(true);
+	});
+});
-- 
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