import type { FeedFilters, FileListParams } 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 motive: `["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-summary`), so collapsing them would change
// which queries refetch. Grouped invalidation stays opt-in per domain (see `invalidateDownloads`).
export const qk = {
  // --- shared roots (invalidated from more than one domain) ---
  me: () => ["me"] as const,
  myStatus: () => ["my-status"] as const,
  tags: () => ["tags"] as const,
  // Per-channel suggested user tags, learned from the manual-tag pattern. Separate root so
  // accepting a suggestion can invalidate it without touching the whole tag catalog.
  tagSuggestions: () => ["tag-suggestions"] 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),
  feedSummary: (filters?: FeedFilters) =>
    filters !== undefined ? (["feed-summary", filters] as const) : (["feed-summary"] as const),
  feedYears: (filters?: FeedFilters) =>
    filters !== undefined ? (["feed-years", filters] as const) : (["feed-years"] 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,
  watchedChannels: () => ["watched-channels"] as const,
  watchedChannelVideos: (id: string) => ["watched-channels", "videos", id] 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,
  // Keyed by source ("feed" | "plex") so each module's views cache independently; `savedViews()` (no
  // arg) stays a prefix for a cross-source invalidation.
  savedViews: (...rest: unknown[]) => ["saved-views", ...rest],

  // --- account / misc --- (me/myStatus/tags already declared as shared roots above)
  version: () => ["version"] as const,
  // Static text bundled with the app (lib/releaseNotes), one file per language: never stale.
  releaseNotes: (lang: string) => ["release-notes", lang] 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,

  // --- sharing ---
  shareRecipients: () => ["share-recipients"] as const,

  // --- files (the library) ---
  // Every listing's key starts with "files", so one invalidation reaches each folder, search and sort.
  files: (p?: FileListParams) => (p ? (["files", p] as const) : (["files"] as const)),
  fileFolders: () => ["file-folders"] as const,
  filePreview: (id: number) => ["file-preview", id] as const,
  storageUsage: () => ["storage-usage"] as const,
  apiTokens: () => ["api-tokens"] as const,
  // --- downloads ---
  downloads: () => ["downloads"] as const,
  downloadIndex: () => ["download-index"] as const,
  downloadProfiles: () => ["download-profiles"] as const,
  downloadCredentials: () => ["download-credentials"] as const,
  downloadLinks: (jobId: number) => ["download-links", jobId] as const,
  folderLinks: (folderId: number) => ["folder-links", folderId] as const,
  dlQuota: (userId: number) => ["dl-quota", userId] as const,
  storyboard: (jobId: number) => ["storyboard", jobId] as const,

  // --- admin ---
  adminUsers: () => ["admin-users"] as const,
  adminUserAccess: (id: number) => ["admin-user-access", id] as const,
  adminInvites: () => ["admin-invites"] as const,
  adminPendingAccess: () => ["admin-pending-access"] as const,
  adminConfig: () => ["admin-config"] as const,
  adminAudit: (filters?: object) =>
    filters !== undefined ? (["admin-audit", filters] as const) : (["admin-audit"] as const),
  adminAuditFacets: (filters?: object) =>
    filters !== undefined
      ? (["admin-audit-facets", filters] as const)
      : (["admin-audit-facets"] as const),
  adminRuns: (filters: object) => ["admin-runs", filters] as const,
  adminRunFacets: (filters: object) => ["admin-run-facets", filters] as const,
  // The console's filters are part of the key; `since` is not (it moves with the clock) — the
  // window it came from is.
  adminLogs: (filters: object) => ["admin-logs", filters] as const,
  adminLogFacets: (filters: object) => ["admin-log-facets", filters] as const,
  adminStorage: () => ["admin-storage"] as const,
  // --- debug sessions ---
  debugSessions: () => ["debug-sessions"] as const,
  debugSession: (id: string) => ["debug-sessions", id] as const,
  debugSessionEvents: (id: string) => ["debug-sessions", id, "events"] as const,
  debugScreenshots: (id: string) => ["debug-sessions", id, "screenshots"] as const,
  // The tracker's rendering of a body: the text is the key. Nothing debounces it — react-query has
  // no such thing — so one fetch per distinct text. What holds the count down is that the composer
  // unmounts the editor while the preview is up, plus the cache for an unchanged draft; a preview
  // shown BESIDE the fields would need a real debounce first (see routes/debug_sessions.py).
  debugSessionPreview: (id: string, text: string) =>
    ["debug-sessions", id, "preview", text] as const,
  adminDownloads: () => ["admin-downloads"] as const,
  adminQuota: (filters: object) => ["admin-quota", filters] 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.
  // The Home surface. `discover()` with no args is the prefix every mutation invalidates —
  // pinning something changes the shelf AND can change the hero, so the two are never invalidated
  // separately. The reroll has its own key so pressing "Mást kérek" does not refetch the rails —
  // but it sits UNDER the same root, because a sibling root ("discover-pick") is not matched by
  // that prefix and the rerolled hero silently outlived every invalidation on the page: play it,
  // finish it, and it was still the answer on screen with a zeroed progress bar.
  discover: (...rest: unknown[]) => ["discover", ...rest],
  discoverPick: (...rest: unknown[]) => ["discover", "pick", ...rest],
  comfortPins: (lang?: string) => ["comfort-pins", ...(lang ? [lang] : [])] as const,
  plex: () => ["plex"] as const,
  plexWatchLink: () => ["plex-watch-link"] as const,
  takeout: () => ["takeout"] as const,
  plexLibrary: (...rest: unknown[]) => ["plex-library", ...rest],
  // Discover surface: the rail payload keyed by scope+lang; `plexDiscover()` (no args) matches it and
  // the Surprise draw below for a prefix invalidation after a watched-toggle.
  plexDiscover: (...rest: unknown[]) => ["plex-discover", ...rest],
  // Variadic like plexDiscover so it can key by scope + lang + the active filters (lang because a genre
  // filter narrows against the language-specific genre column, like the grid). UNDER the discover root,
  // so whatever refreshes the rails (a watched toggle, a player closing) refreshes this one too: its
  // refetch reads the same draw again (`keep`), and only the ↻ deals a new one. As a sibling root the
  // draw's cards kept the watch state they were drawn with.
  plexSurprise: (...rest: unknown[]) => ["plex-discover", "surprise", ...rest],
  plexSuggest: (...rest: unknown[]) => ["plex-suggest", ...rest],
  // Optional trailing `lang`: 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),
  // A show card's next episode. Its own root, not under `plex-show`: a watch write anywhere moves
  // it, and the card reads it fresh (staleTime 0) instead of trusting every write site to invalidate.
  plexShowNext: (showId: string, lang?: string) =>
    ["plex-show-next", showId, ...(lang ? [lang] : [])] as const,
  plexItem: (id: string, lang?: string) => ["plex-item", id, ...(lang ? [lang] : [])] as const,
  // Extraction state of one subtitle track. Not keyed by the playhead: the position is an argument
  // that steers the background extraction, not part of the track's identity.
  plexSubtitle: (id: string, ord: number) => ["plex-subtitle", id, ord] as const,
  plexPlaylists: (...rest: unknown[]) => ["plex-playlists", ...rest],
  // `lang` as on plexShow: omit it for a prefix that matches both languages.
  plexPlaylist: (playlistId: number, lang?: string) =>
    ["plex-playlist", playlistId, ...(lang ? [lang] : [])] 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, lang?: string) =>
    ["plex-person", name, ...(lang ? [lang] : [])] as const,
};

/** The lists the SERVER puts in the reader's alphabet from the language stored in their preferences
 *  (backend `lang_for_user` → `app/collation.py`), so their keys carry no language. Once a language
 *  switch has been saved they are asked for again (App's `changeLanguage`): they re-sort, and a
 *  title-sorted feed never reads its next page under the other alphabet's cursor. */
export const LANGUAGE_ORDERED = [
  qk.feed(),
  qk.channels(),
  qk.discoveredChannels(),
  qk.blockedChannels(),
  qk.shareRecipients(),
  qk.plexCollections(),
] as const;