import { skipToken } from '@reduxjs/toolkit/query';
import { useGetTrackQuery } from '../api/endpoints/library';
import type { QueueEntry } from '../store/slices/queue';

export interface ResolvedQueueEntry {
  trackId: string;
  title: string;
  artistName: string;
  albumTitle: string;
  durationMs: number;
  hasCover: boolean;
  albumArtUrl?: string;
  format?: string;
}

/**
 * Merge a queue entry's play-time snapshot with the live `Track` cache.
 *
 * The queue slice stores denormalized display fields (title/artist/…) captured
 * when a track was queued, so they go stale after metadata enrichment updates
 * the track. This reads through to the RTKQ `Track` cache — invalidated by the
 * same tags that refresh the library — and prefers its fresh values, falling
 * back to the snapshot for instant render and offline. Returns undefined when
 * there is no current entry.
 */
export function useResolvedQueueEntry(
  entry: QueueEntry | undefined,
): ResolvedQueueEntry | undefined {
  const { data } = useGetTrackQuery(entry?.trackId ?? skipToken);
  if (!entry) return undefined;
  return {
    trackId: entry.trackId,
    title: data?.title ?? entry.title,
    artistName: data?.artistName ?? entry.artistName,
    albumTitle: data?.albumTitle ?? entry.albumTitle,
    durationMs: data?.durationMs ?? entry.durationMs,
    hasCover: data?.hasCover ?? false,
    albumArtUrl: data?.albumArtUrl ?? entry.albumArtUrl,
    format: data?.format,
  };
}