/**
 * Module-level cache for the song picker options, shared between the
 * catalog-items table (where the picker lives) and the Sounds admin page
 * (which invalidates after an upload/edit/delete).
 *
 * Living in `src/lib/` (outside any `[dynamic]` route folder) avoids
 * cross-route client imports that confused Turbopack's HMR boundaries
 * and triggered `Router action dispatched before initialization` on
 * the Sounds page in dev.
 */

export interface SoundtrackOption {
  id: number
  code: string
  name: string
  author: string
  length: number
}

let cachedOptions: SoundtrackOption[] | null = null
let inflight: Promise<SoundtrackOption[]> | null = null

export async function loadSongPickerOptions(): Promise<SoundtrackOption[]> {
  if (cachedOptions) return cachedOptions
  if (inflight) return inflight
  inflight = (async () => {
    const res = await fetch('/api/admin/sounds', { cache: 'no-store' })
    if (!res.ok) throw new Error('Failed to load soundtracks')
    const json = (await res.json()) as { ok: boolean; items?: SoundtrackOption[] }
    cachedOptions = json.items ?? []
    inflight = null
    return cachedOptions
  })()
  return inflight
}

export function getCachedSongPickerOptions(): SoundtrackOption[] | null {
  return cachedOptions
}

/** Clear the cache so new uploads show up on next open. */
export function invalidateSongPickerCache(): void {
  cachedOptions = null
}