// Pure selection helpers for saved ("personal") views, split out of SavedViewsProvider so the
// tie-break logic is unit-testable without mounting the provider (its React Query / context deps).

/** Among the views whose filters match the live filters, pick the one to treat as active: prefer the
 *  explicitly-applied ("sticky") view when several capture identical filters, so apply(B) isn't
 *  silently re-attributed to an earlier duplicate A; otherwise the first match. Null if none match. */
export function preferSticky<T extends { id: number }>(
  matches: T[],
  stickyId: number | null,
): T | null {
  return matches.find((v) => v.id === stickyId) ?? matches[0] ?? null;
}

/** The starred default view to seed a module's filters with on first load, or null to leave them.
 *  Seeds ONLY when the module is a genuinely fresh start (`canSeed`: no stored filters for this
 *  account and — feed only — no URL filter override); otherwise the last-session/URL/manual filters
 *  win, exactly as they do after any edit. First `is_default` wins if somehow several are flagged, so
 *  the choice is deterministic. This is the single default-application path for BOTH the feed and Plex
 *  (SavedViewsProvider drives it on the views query's first resolve) — it replaced the feed-only
 *  localStorage mirror that raced the login effect and left Plex with no default at all. */
export function pickDefaultToSeed<T extends { is_default: boolean }>(
  views: T[],
  canSeed: boolean,
): T | null {
  if (!canSeed) return null;
  return views.find((v) => v.is_default) ?? null;
}