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import type { TrackType, TimelineTrack } from "@/lib/timeline";
import { isMainTrack } from "./main-track";
export function getDefaultInsertIndexForTrack({
tracks,
trackType,
}: {
tracks: TimelineTrack[];
trackType: TrackType;
}): number {
if (trackType === "audio") {
return tracks.length;
}
if (trackType === "effect") {
return 0;
}
const mainTrackIndex = tracks.findIndex((track) => isMainTrack(track));
if (mainTrackIndex >= 0) {
return mainTrackIndex;
}
const firstAudioTrackIndex = tracks.findIndex((track) => track.type === "audio");
if (firstAudioTrackIndex >= 0) {
return firstAudioTrackIndex;
}
return tracks.length;
}
export function getHighestInsertIndexForTrack({
tracks,
trackType,
}: {
tracks: TimelineTrack[];
trackType: TrackType;
}): number {
const mainTrackIndex = tracks.findIndex((track) => isMainTrack(track));
if (trackType === "audio") {
return mainTrackIndex >= 0 ? mainTrackIndex + 1 : tracks.length;
}
return 0;
}
export function resolvePreferredNewTrackPlacement({
tracks,
trackType,
preferredIndex,
direction,
}: {
tracks: TimelineTrack[];
trackType: TrackType;
preferredIndex: number;
direction: "above" | "below";
}): { insertIndex: number; insertPosition: "above" | "below" | null } {
if (tracks.length === 0) {
return {
insertIndex: 0,
insertPosition: trackType === "audio" ? "below" : null,
};
}
const safePreferredIndex = Math.min(
Math.max(preferredIndex, 0),
tracks.length - 1,
);
const mainTrackIndex = tracks.findIndex((track) => isMainTrack(track));
if (trackType === "audio") {
if (safePreferredIndex <= mainTrackIndex) {
return {
insertIndex: mainTrackIndex + 1,
insertPosition: "below",
};
}
return {
insertIndex:
direction === "above" ? safePreferredIndex : safePreferredIndex + 1,
insertPosition: direction,
};
}
const insertIndex =
direction === "above" ? safePreferredIndex : safePreferredIndex + 1;
if (mainTrackIndex >= 0 && insertIndex > mainTrackIndex) {
return {
insertIndex: mainTrackIndex,
insertPosition: "above",
};
}
return {
insertIndex,
insertPosition: direction,
};
}
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