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import type { TimelineTrack } from "@/types/timeline";
import type { MediaAsset } from "@/types/assets";
import { RootNode } from "./nodes/root-node";
import { VideoNode } from "./nodes/video-node";
import { ImageNode } from "./nodes/image-node";
import { TextNode } from "./nodes/text-node";
import { StickerNode } from "./nodes/sticker-node";
import { ColorNode } from "./nodes/color-node";
import { BlurBackgroundNode } from "./nodes/blur-background-node";
import type { TBackground, TCanvasSize } from "@/types/project";
import { DEFAULT_BLUR_INTENSITY } from "@/constants/project-constants";
import { isMainTrack } from "@/lib/timeline";
export type BuildSceneParams = {
canvasSize: TCanvasSize;
tracks: TimelineTrack[];
mediaAssets: MediaAsset[];
duration: number;
background: TBackground;
};
export function buildScene(params: BuildSceneParams) {
const { tracks, mediaAssets, duration, canvasSize, background } = params;
const rootNode = new RootNode({ duration });
const mediaMap = new Map(mediaAssets.map((m) => [m.id, m]));
const visibleTracks = tracks.filter(
(track) => !("hidden" in track && track.hidden),
);
const mainTrack = visibleTracks.find((track) => isMainTrack(track)) ?? null;
const orderedTracksTopToBottom = [
...visibleTracks.filter((track) => !isMainTrack(track)),
...(mainTrack ? [mainTrack] : []),
];
const orderedTracksBottomToTop = orderedTracksTopToBottom.slice().reverse();
const contentNodes = [];
for (const track of orderedTracksBottomToTop) {
const elements = track.elements
.filter((element) => !("hidden" in element && element.hidden))
.slice()
.sort((a, b) => {
if (a.startTime !== b.startTime) return a.startTime - b.startTime;
return a.id.localeCompare(b.id);
});
for (const element of elements) {
if (element.type === "video" || element.type === "image") {
const mediaAsset = mediaMap.get(element.mediaId);
if (!mediaAsset?.file) {
continue;
}
if (mediaAsset.type === "video") {
contentNodes.push(
new VideoNode({
mediaId: mediaAsset.id,
file: mediaAsset.file,
duration: element.duration,
timeOffset: element.startTime,
trimStart: element.trimStart,
trimEnd: element.trimEnd,
}),
);
}
if (mediaAsset.type === "image") {
contentNodes.push(
new ImageNode({
file: mediaAsset.file,
duration: element.duration,
timeOffset: element.startTime,
trimStart: element.trimStart,
trimEnd: element.trimEnd,
}),
);
}
}
if (element.type === "text") {
contentNodes.push(
new TextNode({
...element,
canvasCenter: { x: canvasSize.width / 2, y: canvasSize.height / 2 },
textBaseline: "middle",
}),
);
}
if (element.type === "sticker") {
contentNodes.push(
new StickerNode({
iconName: element.iconName,
duration: element.duration,
timeOffset: element.startTime,
trimStart: element.trimStart,
trimEnd: element.trimEnd,
transform: element.transform,
opacity: element.opacity,
color: element.color,
}),
);
}
}
}
if (background.type === "blur") {
rootNode.add(
new BlurBackgroundNode({
blurIntensity: background.blurIntensity ?? DEFAULT_BLUR_INTENSITY,
contentNodes,
}),
);
for (const node of contentNodes) {
rootNode.add(node);
}
} else {
if (background.type === "color" && background.color !== "transparent") {
rootNode.add(new ColorNode({ color: background.color }));
}
for (const node of contentNodes) {
rootNode.add(node);
}
}
return rootNode;
}
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