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import { describe, expect, mock, test } from "bun:test";
import type { DragEvent } from "react";
import type { SceneTracks, VideoElement, VideoTrack } from "@/timeline";
import {
DragDropController,
type DragDropConfig,
type DragDropConfigRef,
} from "@/timeline/controllers/drag-drop-controller";
import { TimelineDragSource } from "@/timeline/drag-source";
import { mediaTime, TICKS_PER_SECOND, ZERO_MEDIA_TIME } from "@/wasm";
function buildVideo({
id,
start,
}: {
id: string;
start: number;
}): VideoElement {
return {
id,
type: "video",
name: id,
mediaId: `media-${id}`,
startTime: mediaTime({ ticks: start }),
duration: mediaTime({ ticks: TICKS_PER_SECOND }),
trimStart: ZERO_MEDIA_TIME,
trimEnd: ZERO_MEDIA_TIME,
params: { opacity: id === "incoming" ? 0.8 : 1 },
};
}
function buildTracks(): SceneTracks {
const main: VideoTrack = {
id: "visual",
type: "video",
name: "Visual",
elements: [
buildVideo({ id: "outgoing", start: 0 }),
buildVideo({ id: "incoming", start: TICKS_PER_SECOND }),
],
muted: false,
hidden: false,
};
return { overlay: [], main, audio: [] };
}
function buildDataTransfer(): DataTransfer {
return {
types: [],
files: [],
dropEffect: "none",
effectAllowed: "none",
setData: mock(() => {}),
} as unknown as DataTransfer;
}
function buildDragEvent({
clientX,
dataTransfer,
}: {
clientX: number;
dataTransfer: DataTransfer;
}): DragEvent {
return {
clientX,
clientY: 10,
dataTransfer,
preventDefault: mock(() => {}),
} as unknown as DragEvent;
}
function setup() {
const dragSource = new TimelineDragSource();
const updateElements = mock<DragDropConfig["updateElements"]>(() => {});
const insertElement = mock<DragDropConfig["insertElement"]>(() => {});
const executeCommand = mock<DragDropConfig["executeCommand"]>(() => {});
const tracksElement = {
scrollLeft: 0,
scrollTop: 0,
getBoundingClientRect: () => ({ left: 0, top: 0 }),
} as unknown as HTMLDivElement;
const config: DragDropConfig = {
zoomLevel: 1,
getContainerEl: () => tracksElement,
getHeaderEl: () => null,
getTracksScrollEl: () => tracksElement,
getActiveProjectFps: () => null,
getActiveProjectId: () => null,
getSceneTracks: buildTracks,
getCurrentPlayheadTime: () => ZERO_MEDIA_TIME,
getMediaAssets: () => [],
dragSource,
addMediaAsset: () => Promise.resolve(null),
executeCommand,
insertElement,
updateElements,
addClipEffect: mock(() => {}),
};
const configRef: DragDropConfigRef = { current: config };
return {
controller: new DragDropController({ configRef }),
dragSource,
updateElements,
insertElement,
executeCommand,
};
}
function beginTransitionDrag(
dragSource: TimelineDragSource,
dataTransfer: DataTransfer,
) {
dragSource.begin({
dataTransfer,
dragData: {
type: "transition",
id: "push-left",
name: "Slide left",
transitionKind: "push-left",
inDuration: 0.45,
outDuration: 0,
},
});
}
describe("DragDropController transition drops", () => {
test("hovers and applies a transition only to the incoming clip", () => {
const {
controller,
dragSource,
updateElements,
insertElement,
executeCommand,
} = setup();
const dataTransfer = buildDataTransfer();
beginTransitionDrag(dragSource, dataTransfer);
controller.onDragOver(buildDragEvent({ clientX: 50, dataTransfer }));
expect(dataTransfer.dropEffect).toBe("copy");
expect(controller.dropTarget?.targetCut).toEqual({
trackId: "visual",
outgoingElementId: "outgoing",
incomingElementId: "incoming",
time: mediaTime({ ticks: TICKS_PER_SECOND }),
});
controller.onDrop(buildDragEvent({ clientX: 50, dataTransfer }));
expect(updateElements).toHaveBeenCalledTimes(1);
expect(updateElements).toHaveBeenCalledWith({
updates: [
{
trackId: "visual",
elementId: "incoming",
patch: {
params: {
opacity: 0.8,
"transition.kind": "push-left",
"transition.inDuration": 0.45,
"transition.outDuration": 0,
},
},
},
],
});
expect(insertElement).not.toHaveBeenCalled();
expect(executeCommand).not.toHaveBeenCalled();
});
test("does nothing when the transition has no cut target", () => {
const {
controller,
dragSource,
updateElements,
insertElement,
executeCommand,
} = setup();
const dataTransfer = buildDataTransfer();
beginTransitionDrag(dragSource, dataTransfer);
controller.onDragOver(buildDragEvent({ clientX: 80, dataTransfer }));
expect(controller.dropTarget).toBeNull();
controller.onDrop(buildDragEvent({ clientX: 80, dataTransfer }));
expect(updateElements).not.toHaveBeenCalled();
expect(insertElement).not.toHaveBeenCalled();
expect(executeCommand).not.toHaveBeenCalled();
});
});
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