import { useState } from "react";
import { useTranslation } from "react-i18next";
import { useQueryClient } from "@tanstack/react-query";
import { Check, Info, Layers, ListPlus, Play, RotateCcw, Tv2, Undo2 } from "lucide-react";

import { type PlexCard } from "../../lib/api";
import { qk } from "../../lib/queryKeys";
import PlexCollectionAddAt, { type PlexCollectionTarget } from "./PlexCollectionAdd";
import { pinPlex, useComfortPin } from "../comfort/comfortPin";
import { useCopyItems } from "../../components/ui/copyItems";
import PlexPlaylistAdd, { type PlexAddTarget } from "./PlexPlaylistAdd";
import { type ActionMenuItem } from "../../components/ui/ActionMenu";

// A Plex title's ONE action list (docs/DESIGN.md "Action placement"): the right-click, the
// long-press, Shift+F10 and the card's "…" open a menu built here, so every poster grid and rail
// lists the same actions in the same order. The card keeps its state (watched, progress) at rest and
// the everyday toggles (watched, add to playlist) on hover; details, copy and the pin live here.

export interface PlexActionHandlers {
  /** Play it: a show, the episode it would play (the surface resolves it). */
  onOpen: (c: PlexCard) => void;
  /** The media-info page, or a show's own page. Omitted where a surface has none (the episode
   *  lists). */
  onInfo?: (c: PlexCard) => void;
  onToggleWatched?: (c: PlexCard) => void;
  /** Play from the start instead of the resume point (C5). Where given, a started title lists it
   *  under Play — on touch, the only way to it (the card's hover pair is mouse-only). */
  onRestart?: (c: PlexCard) => void;
}

const icon = "w-4 h-4";

/** The "add to playlist" row and button: an episode says which it adds, as the season page does. */
export const plexAddLabelKey = (c: PlexCard): string =>
  c.type === "episode" ? "plex.playlist.addEpisode" : "plex.playlistAdd.manage";

/** A leaf: a movie or an episode, what the watched toggle, the playlist add and a resume point
 *  belong to. A show plays too, through the episode it resolves to. */
const isPlexPlayable = (c: PlexCard): boolean => c.type !== "show";

/** Has a resume point: the click continues it, and "from the start" is a choice. A watched item is
 *  stored at 0, so it never counts. A show has one when an episode does (`resumable`, the episode its
 *  click plays): part watched with its next episode untouched, Continue and Restart would be the same
 *  thing, so it is not "started" here — its in-progress badge says how far it has got. */
export const plexStarted = (c: PlexCard): boolean =>
  isPlexPlayable(c)
    ? c.status !== "watched" && (c.position_seconds ?? 0) > 0
    : c.resumable === true;

/** `open` is the host menu's own flag (the shelf is fetched only once a menu opened). Returns the
 *  item builder, `add` for the card's own hover button, and the dialog to render beside the menu
 *  (one per list, so a card does not mount a modal of its own). */
export function usePlexCardActions(handlers: PlexActionHandlers, open: boolean) {
  const { t } = useTranslation();
  const pin = useComfortPin(open);
  const copy = useCopyItems();
  const addLabel = (c: PlexCard) => t(plexAddLabelKey(c));
  const [adding, setAdding] = useState<PlexAddTarget | null>(null);
  const [collecting, setCollecting] = useState<PlexCollectionTarget | null>(null);
  // Collections are shared and written to Plex itself, so only an admin edits them (as on the title's
  // own page).
  const qc = useQueryClient();
  const isAdmin = qc.getQueryData<{ role?: string }>(qk.me())?.role === "admin";
  // A whole show needs its episode keys, which only the show page has ("Add whole show" there), so
  // only a leaf is added from a card.
  const add = (c: PlexCard) => setAdding({ kind: "single", ratingKey: c.id, title: c.title });

  /** `play: false` where the host menu leads with its own Play row (Home's shelf resolves `next`);
   *  `pin: false` where the host carries its own shelf rows or the object is not a pin kind;
   *  `anchor`: the element the menu came from, which "Add to collection…" opens its panel beside —
   *  without one the row is left out rather than opening the panel at a corner. Required, so every
   *  host menu decides: an optional one let a menu that has an anchor drop the row silently. */
  const items = (
    c: PlexCard,
    {
      play = true,
      pin: withPin = true,
      anchor,
    }: { play?: boolean; pin?: boolean; anchor: Element | null },
  ): ActionMenuItem[] => {
    const { onOpen, onInfo, onToggleWatched, onRestart } = handlers;
    const playable = isPlexPlayable(c);
    const isShow = c.type === "show";
    const watched = c.status === "watched";
    const started = plexStarted(c);
    return [
      ...(play
        ? [
            {
              id: "play",
              label: started ? t("card.continue") : t("plex.play"),
              icon: <Play className={icon} />,
              onSelect: () => onOpen(c),
            },
            // The same words and glyph as the video card's menu (useVideoActions).
            ...(started && onRestart
              ? [
                  {
                    id: "restart",
                    label: t("card.restartTitle"),
                    icon: <RotateCcw className={icon} />,
                    onSelect: () => onRestart(c),
                  },
                ]
              : []),
          ]
        : []),
      ...(playable && onToggleWatched
        ? [
            {
              id: "watched",
              label: watched ? t("plex.markUnwatched") : t("plex.markWatched"),
              icon: watched ? <Undo2 className={icon} /> : <Check className={icon} />,
              separatorBefore: true,
              onSelect: () => onToggleWatched(c),
            },
          ]
        : []),
      ...(playable
        ? [
            {
              id: "playlist",
              label: addLabel(c),
              icon: <ListPlus className={icon} />,
              separatorBefore: !onToggleWatched,
              onSelect: () => add(c),
            },
          ]
        : []),
      // A movie or a show can be a collection member; an episode cannot.
      ...(isAdmin && anchor && c.type !== "episode"
        ? [
            {
              id: "collection",
              label: t("plex.collectionAdd.row"),
              icon: <Layers className={icon} />,
              separatorBefore: !playable,
              onSelect: () => setCollecting({ ratingKey: c.id, anchor }),
            },
          ]
        : []),
      ...(onInfo
        ? [
            {
              id: "details",
              label: isShow ? t("plex.openShow") : t("plex.info.title"),
              icon: isShow ? <Tv2 className={icon} /> : <Info className={icon} />,
              separatorBefore: true,
              onSelect: () => onInfo(c),
            },
          ]
        : []),
      ...copy(c.title, null).map((it) => ({ ...it, separatorBefore: !onInfo })),
      ...(withPin ? pin.item(pinPlex(c), c.title) : []),
    ];
  };

  const panel = (
    <>
      {adding && <PlexPlaylistAdd target={adding} onClose={() => setAdding(null)} />}
      {collecting && (
        <PlexCollectionAddAt target={collecting} onClose={() => setCollecting(null)} />
      )}
    </>
  );
  return { items, add, panel };
}

export type PlexCardActions = ReturnType<typeof usePlexCardActions>;