import { useLayoutEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { useQuery, useQueryClient } from "@tanstack/react-query";
import { qk } from "../lib/queryKeys";
import { ListPlus } from "lucide-react";
import { YouTubeIcon } from "../lib/brandIcons";
import { api, type Playlist } from "../lib/api";
import { notifyActionError } from "../lib/actionErrors";
import { playlistName } from "../lib/playlistName";
import { PopoverSurface } from "./ui/AnchoredPopover";
import { useAnchoredPopover } from "./ui/anchoredPopoverHooks";
import { IconButton } from "./ui/IconButton";
import { MembershipMenu } from "./ui/MembershipMenu";
import { SURFACE } from "./ui/surfaces";

// A small anchored menu for toggling a video's membership in the user's playlists, with inline
// "new playlist" creation. Its body is the shared MembershipMenu (as the channel tag editor's).
export default function AddToPlaylist({
  videoId,
  variant = "ghost",
  size = "sm",
}: {
  videoId: string;
  variant?: "ghost" | "outline" | "overlay" | "media";
  size?: "sm" | "md";
}) {
  const { t } = useTranslation();
  const [open, setOpen] = useState(false);
  const pop = useMembershipPopover(open, setOpen);
  const { setReference } = pop.refs;
  return (
    <>
      <IconButton
        ref={setReference}
        variant={variant}
        size={size}
        {...pop.getReferenceProps({
          // The trigger sits on a feed card that opens the player on click, so the toggle must not
          // reach it.
          onClick: (e) => {
            e.preventDefault();
            e.stopPropagation();
          },
        })}
        label={t("playlists.addToPlaylist")}
      >
        <ListPlus />
      </IconButton>
      <MembershipPanel videoId={videoId} pop={pop} />
    </>
  );
}

/** The same panel, opened from an object's menu ("Add to playlist…") rather than its own
 *  button: anchored to the element the menu came from, and gone when it closes. */
export function AddToPlaylistAt({
  videoId,
  anchor,
  onClose,
}: {
  videoId: string;
  anchor: Element;
  onClose: () => void;
}) {
  const pop = useMembershipPopover(true, (next) => {
    if (!next) onClose();
  });
  const { setPositionReference } = pop.refs;
  useLayoutEffect(() => setPositionReference(anchor), [anchor, setPositionReference]);
  return <MembershipPanel videoId={videoId} pop={pop} />;
}

function useMembershipPopover(open: boolean, onOpenChange: (open: boolean) => void) {
  return useAnchoredPopover({
    open,
    onOpenChange,
    offset: 6,
    // The menu holds a "new playlist" text field — keep typed chars and pointer-hover out of the
    // roving list so they don't steal the caret.
    hostsInput: true,
  });
}

function MembershipPanel({
  videoId,
  pop,
}: {
  videoId: string;
  pop: ReturnType<typeof useAnchoredPopover>;
}) {
  const { t } = useTranslation();
  const qc = useQueryClient();
  const open = pop.open;
  const [busy, setBusy] = useState(false);

  const membership = useQuery({
    queryKey: qk.playlistMembership(videoId),
    queryFn: () => api.playlists(videoId),
    enabled: open,
  });

  function refresh() {
    qc.invalidateQueries({ queryKey: qk.playlistMembership(videoId) });
    qc.invalidateQueries({ queryKey: qk.playlists() });
    // Also invalidate every open/cached playlist detail (["playlist", id]) so the
    // Playlists page reflects the add/remove when navigated to, not only after F5.
    qc.invalidateQueries({ queryKey: qk.playlist() });
  }

  // A failure is said, and the list refreshed either way. With no catch, a playlist deleted on
  // another device (a 404 `not_found/playlist` — still offered, from a cache up to 30 s old) was an
  // unhandled rejection: the tick did not change, nothing was said, the gone row stayed. A write that
  // landed flips the tick at once: a second tap before the refetch returned would otherwise repeat it.
  async function toggle(pl: Playlist) {
    if (busy) return;
    setBusy(true);
    try {
      if (pl.has_video) await api.removeFromPlaylist(pl.id, videoId);
      else await api.addToPlaylist(pl.id, videoId);
      qc.setQueryData<Playlist[]>(qk.playlistMembership(videoId), (old) =>
        old?.map((p) => (p.id === pl.id ? { ...p, has_video: !p.has_video } : p)),
      );
    } catch (e) {
      notifyActionError(e, t(pl.has_video ? "playlists.removeFailed" : "playlists.addFailed"));
    }
    refresh();
    setBusy(false);
  }

  async function createAndAdd(name: string) {
    if (busy) return false;
    setBusy(true);
    let made = false;
    try {
      const pl = await api.createPlaylist(name);
      await api.addToPlaylist(pl.id, videoId);
      made = true;
    } catch (e) {
      notifyActionError(e, t("playlists.addFailed"));
    }
    refresh();
    setBusy(false);
    return made;
  }

  // All of the user's playlists are add targets, including YouTube-linked ones — adding
  // marks them dirty, and a later "Sync to YouTube" pushes the change back.
  const lists = membership.data ?? [];

  return (
    <PopoverSurface
      popover={pop}
      className={`${SURFACE.popover} w-60 p-2`}
      ariaLabel={t("playlists.addToPlaylistTitle")}
    >
      <MembershipMenu
        heading={t("playlists.addToPlaylistTitle")}
        rows={lists.map((pl) => ({
          id: pl.id,
          label: playlistName(pl, t),
          checked: !!pl.has_video,
          extra:
            pl.source === "youtube" || pl.yt_playlist_id ? (
              <YouTubeIcon className="w-3 h-3 shrink-0 text-muted" />
            ) : undefined,
        }))}
        onToggle={(row) => {
          const pl = lists.find((p) => p.id === row.id);
          if (pl) void toggle(pl);
        }}
        status={
          membership.isError && !membership.data
            ? "error"
            : membership.isLoading
              ? "loading"
              : "ready"
        }
        onRetry={() => void membership.refetch()}
        emptyText={t("playlists.noneYet")}
        errorText={t("common.loadError")}
        busy={busy}
        create={{ placeholder: t("playlists.newPlaylist"), onCreate: createAndAdd }}
      />
    </PopoverSurface>
  );
}