import { useLayoutEffect } from "react";
import { useTranslation } from "react-i18next";
import { useQuery } from "@tanstack/react-query";
import { qk } from "../lib/queryKeys";
import { api, type Video } from "../lib/api";
import { formatDate, formatDuration, formatCompact } from "../lib/format";
import { linkify } from "../lib/linkify";
import Avatar from "./ui/Avatar";
import { PopoverSurface } from "./ui/AnchoredPopover";
import { useAnchoredPopover } from "./ui/anchoredPopoverHooks";
import { SURFACE } from "./ui/surfaces";
import { Badge } from "./ui/Badge";
import { useTags } from "../lib/useTags";

// A video's details (E8·S3, decision D3): full (un-clamped) title, channel, views·duration·date, a
// description snippet, and the channel's tags. E28 C1 moved it from a hover ⓘ on the thumbnail into
// the video's action list ("Details"): the hover card was invisible on touch and one more button in
// the card's hover row, and the menu is the one door every device has. It opens anchored to the card
// the menu came from, as a small dialog.
//
// The card face already carries title/channel/date/duration/views, so the box's real added value is
// the FULL title (the card clamps to 2 lines) plus the description + tags, which aren't in the feed
// list payload. Both are fetched ON DEMAND on open (like AboutCell): the description via
// `videoDetail`, the tags by resolving the channel's `tag_ids` (from `channelDetail`, shared with the
// channel page's cache) against the tag list. Until they land the header still shows from the Video
// we already have, so the box is never empty.
export default function VideoDetailsAt({
  video,
  anchor,
  onClose,
}: {
  video: Video;
  anchor: Element;
  onClose: () => void;
}) {
  const { t, i18n } = useTranslation();
  const lang = i18n.language;
  const pop = useAnchoredPopover({
    open: true,
    onOpenChange: (next) => {
      if (!next) onClose();
    },
    mode: "dialog",
    role: "dialog",
    placement: "bottom-start",
    offset: 6,
    fitHeight: true,
  });
  const { setPositionReference } = pop.refs;
  useLayoutEffect(() => setPositionReference(anchor), [anchor, setPositionReference]);

  const { data: detail } = useQuery({
    queryKey: qk.videoDetail(video.id),
    queryFn: () => api.videoDetail(video.id),
    staleTime: 5 * 60_000,
  });
  const { data: channel } = useQuery({
    queryKey: qk.channel(video.channel_id),
    queryFn: () => api.channelDetail(video.channel_id),
    enabled: !!video.channel_id,
    staleTime: 5 * 60_000,
  });
  const { data: tags } = useTags({ staleTime: 5 * 60_000 });

  // The channel's tags (`tag_ids`), in the channel's own id order, resolved to names via the tag list.
  // These are the channel-tags the channel actually carries; an unknown id (a just-deleted tag) drops.
  const tagNames =
    channel && tags
      ? channel.tag_ids
          .map((id) => tags.find((tg) => tg.id === id))
          .filter((tg): tg is NonNullable<typeof tg> => !!tg)
      : [];

  const description = detail?.description?.trim();
  const metaBits = [
    video.view_count != null ? `${formatCompact(video.view_count, lang)} ${t("card.views")}` : null,
    video.duration_seconds != null ? formatDuration(video.duration_seconds) : null,
    video.published_at ? formatDate(video.published_at, i18n.language) : null,
  ].filter(Boolean);

  return (
    <PopoverSurface
      popover={pop}
      ariaLabel={t("card.info")}
      className={`${SURFACE.popover} w-85 max-w-[92vw] overflow-y-auto px-3.5 py-3 animate-[fadeIn_0.12s_ease]`}
      style={{ maxHeight: "min(26rem, var(--fit-max-h, 26rem))" }}
    >
      <p className="text-sm font-medium leading-snug wrap-break-word">{video.title}</p>
      <div className="mt-2 flex items-center gap-2">
        <Avatar
          src={video.channel_thumbnail}
          fallback={video.channel_title ?? ""}
          className="w-6 h-6 rounded-full shrink-0"
        />
        <span className="text-xs text-muted truncate">{video.channel_title}</span>
      </div>
      {metaBits.length > 0 && <p className="mt-1.5 text-xs text-muted">{metaBits.join(" · ")}</p>}
      {description ? (
        <p className="mt-2.5 text-xs leading-relaxed text-muted line-clamp-5 wrap-break-word">
          {linkify(description)}
        </p>
      ) : detail ? (
        <p className="mt-2.5 text-xs italic text-muted">{t("card.noDescription")}</p>
      ) : null}
      {tagNames.length > 0 && (
        <div className="mt-3 flex flex-wrap gap-1.5">
          {tagNames.map((tg) => (
            <Badge key={tg.id}>{tg.name}</Badge>
          ))}
        </div>
      )}
    </PopoverSurface>
  );
}