import type { FeedFilters } from "./api";

// Single source of truth for React Query keys. Every key root lives here exactly once, so a typo
// at one of the ~200 call sites can no longer mint an orphan key that silently never invalidates
// (the R7 driver: `["feed"]` was hand-written in 15+ files). CONTRACT: each function returns the
// SAME array shape the call sites used before, so TanStack's partial (prefix) matching is
// unchanged — `qk.feed()` (`["feed"]`) still invalidates `qk.feed(filters)` (`["feed", filters]`).
// Deliberately NOT bundling co-invalidations into helpers here: the clusters differ per call site
// (some invalidate `feed` alone, others `feed` + `feed-count`), so collapsing them would change
// which queries refetch. Grouped invalidation stays opt-in per domain (see `invalidateDownloads`).
// Extended per domain as R7 S2 migrates each area (S2a: feed/channels/playlists + shared roots).
export const qk = {
  // --- shared roots (invalidated from more than one domain) ---
  me: () => ["me"] as const,
  myStatus: () => ["my-status"] as const,
  tags: () => ["tags"] as const,

  // --- feed / video ---
  // Every parameterized key guards on `!== undefined` (not truthiness), so "no arg → bare prefix
  // key" is the ONE rule across the factory. It also keeps a nullable segment intact: `q`/`id`
  // accept null because some call sites key on nullable state (`selectedId`, the search string),
  // and a NULL is a real key segment that must be preserved (`["playlist", null]`) rather than
  // silently collapsed to the prefix.
  feed: (filters?: FeedFilters) =>
    filters !== undefined ? (["feed", filters] as const) : (["feed"] as const),
  feedCount: (filters?: FeedFilters) =>
    filters !== undefined ? (["feed-count", filters] as const) : (["feed-count"] as const),
  facets: (filters?: FeedFilters) =>
    filters !== undefined ? (["facets", filters] as const) : (["facets"] as const),
  ytSearch: (q?: string | null, count?: number) =>
    q !== undefined ? (["yt-search", q, count] as const) : (["yt-search"] as const),
  videoDetail: (id: string) => ["video-detail", id] as const,

  // --- channels ---
  channels: () => ["channels"] as const,
  channel: (id: string) => ["channel", id] as const,
  discoveredChannels: () => ["discovered-channels"] as const,
  blockedChannels: () => ["blocked-channels"] as const,

  // --- playlists ---
  playlists: () => ["playlists"] as const,
  playlist: (id?: number | null) =>
    id !== undefined ? (["playlist", id] as const) : (["playlist"] as const),
  playlistMembership: (videoId: string) => ["playlist-membership", videoId] as const,
  savedViews: () => ["saved-views"] as const,

  // --- account / misc (R7 S2b) --- (me/myStatus/tags already declared as shared roots above)
  accounts: () => ["accounts"] as const,
  version: () => ["version"] as const,
  setupStatus: () => ["setup-status"] as const,
  myUsage: () => ["my-usage"] as const,
  scheduler: () => ["scheduler"] as const,

  // --- notifications ---
  notifications: () => ["notifications"] as const,
  notifUnread: () => ["notif-unread"] as const,

  // --- messaging ---
  conversations: () => ["conversations"] as const,
  thread: (partnerId: number | null) => ["thread", partnerId] as const,
  messageKey: () => ["message-key"] as const,
  messageUnread: () => ["message-unread"] as const,
  messageUsers: () => ["message-users"] as const,
  shareRecipients: () => ["share-recipients"] as const,

  // --- downloads ---
  downloads: () => ["downloads"] as const,
  downloadsShared: () => ["downloads-shared"] as const,
  downloadIndex: () => ["download-index"] as const,
  downloadUsage: () => ["download-usage"] as const,
  downloadProfiles: () => ["download-profiles"] as const,
  downloadLinks: (jobId: number) => ["download-links", jobId] as const,
  dlQuota: (userId: number) => ["dl-quota", userId] as const,
  storyboard: (jobId: number) => ["storyboard", jobId] as const,

  // --- admin ---
  adminUsers: () => ["admin-users"] as const,
  adminInvites: () => ["admin-invites"] as const,
  adminConfig: () => ["admin-config"] as const,
  adminAudit: () => ["admin-audit"] as const,
  adminStorage: () => ["admin-storage"] as const,
  adminDownloads: () => ["admin-downloads"] as const,
  adminQuota: (days: number) => ["admin-quota", days] as const,
  demoWhitelist: () => ["demo-whitelist"] as const,

  // --- plex ---
  // The composite plex keys carry a heterogeneous arg list (a filters object, a ratingKeys
  // array, a "union"/"group"/"contains" discriminator), so they take a variadic pass-through:
  // the value this factory centralizes is the ROOT string, and TanStack keys are `unknown[]`
  // anyway. Single-id plex keys stay precisely typed.
  plex: () => ["plex"] as const,
  plexWatchLink: () => ["plex-watch-link"] as const,
  plexLibrary: (...rest: unknown[]) => ["plex-library", ...rest],
  plexSuggest: (...rest: unknown[]) => ["plex-suggest", ...rest],
  // Optional trailing `lang` (E5 S6): a language switch remounts the detail with a new key so HU/EN
  // metadata is cached separately. Omitting it (e.g. for a prefix invalidation) still matches both.
  plexShow: (showId?: string, lang?: string) =>
    showId !== undefined
      ? (["plex-show", showId, ...(lang ? [lang] : [])] as const)
      : (["plex-show"] as const),
  plexItem: (id: string, lang?: string) => ["plex-item", id, ...(lang ? [lang] : [])] as const,
  plexPlaylists: (...rest: unknown[]) => ["plex-playlists", ...rest],
  plexPlaylist: (playlistId: number) => ["plex-playlist", playlistId] as const,
  plexCollections: (...rest: unknown[]) => ["plex-collections", ...rest],
  // facetKey is a filters-derived OBJECT segment (not a scalar), so this key is heterogeneous too.
  plexFacets: (...rest: unknown[]) => ["plex-facets", ...rest],
  plexPeopleCards: (scope: string, actors: string[]) =>
    ["plex-people-cards", scope, actors] as const,
  plexPerson: (name: string) => ["plex-person", name] as const,
};