import { Heart, Images } from "lucide-react";
import Link from "next/link";
import { memo, type ReactNode, useEffect, useRef } from "react";
import { awemeHref } from "@/lib/playback-context";
import type { PlaylistState } from "../hooks/usePlaylist";

interface WorksGridProps {
  /** 所在标签页当前可见 */
  active: boolean;
  list: PlaylistState;
  currentId: string;
  /** 点击作品跳转时带上的播放上下文查询串 */
  hrefQuery: string;
  onSelect: () => void;
  /** 列表只有当前这一个作品时的提示 */
  singleHint?: string;
  /** 网格上方的标题栏 */
  header: ReactNode;
  /** 标题栏下方的附加内容（如相关 tag） */
  subheader?: ReactNode;
}

function formatCount(n: number): string {
  if (n >= 10000) return `${(n / 10000).toFixed(n >= 100000 ? 0 : 1)}万`;
  return String(n);
}

function PlayingBars() {
  return (
    <span className="flex h-4 items-end gap-0.5" aria-hidden>
      {[60, 100, 40].map((height, i) => (
        <span
          key={height}
          className="w-1 rounded-sm bg-white animate-pulse"
          style={{ height: `${height}%`, animationDelay: `${i * 150}ms` }}
        />
      ))}
    </span>
  );
}

// 侧栏里的作品封面网格（TA的作品 / 搜索结果 / hashtag 共用）：当前作品标「播放中」，点作品就地切换
export const WorksGrid = memo(function WorksGrid({
  active,
  list,
  currentId,
  hrefQuery,
  onSelect,
  singleHint,
  header,
  subheader,
}: WorksGridProps) {
  const scrollRef = useRef<HTMLDivElement>(null);
  const currentRef = useRef<HTMLAnchorElement>(null);
  const items = list.items ?? [];

  // 让「播放中」的作品保持在可见区域（切换作品或列表加载完成时重新定位）
  // biome-ignore lint/correctness/useExhaustiveDependencies: currentId / items.length 只用来触发重新定位
  useEffect(() => {
    if (!active) return;
    const container = scrollRef.current;
    const el = currentRef.current;
    if (!container || !el) return;
    const top = el.offsetTop - container.offsetTop;
    const bottom = top + el.offsetHeight;
    if (
      top < container.scrollTop ||
      bottom > container.scrollTop + container.clientHeight
    ) {
      container.scrollTop =
        top - (container.clientHeight - el.offsetHeight) / 2;
    }
  }, [active, currentId, items.length]);

  return (
    <div className="flex min-h-0 flex-1 flex-col">
      <div className="flex items-center gap-3 px-3 py-3 border-b border-white/10 shrink-0">
        {header}
      </div>
      {subheader}

      <div ref={scrollRef} className="comment-scroll flex-1 overflow-auto p-2">
        {list.loading && !list.items && (
          <div className="py-10 text-center text-sm text-white/60">
            加载中...
          </div>
        )}
        {list.error && !list.items && (
          <div className="py-10 text-center text-sm text-red-300/80">
            {list.error}
          </div>
        )}
        <div className="grid grid-cols-3 gap-1.5">
          {items.map((item) => {
            const isCurrent = item.aweme_id === currentId;
            return (
              <Link
                key={item.aweme_id}
                ref={isCurrent ? currentRef : undefined}
                href={awemeHref(item.aweme_id, hrefQuery)}
                scroll={false}
                onClick={onSelect}
                title={item.desc}
                aria-current={isCurrent ? "true" : undefined}
                className={`relative block aspect-[3/4] overflow-hidden rounded-md bg-white/5 ${
                  isCurrent ? "ring-2 ring-rose-400" : "hover:opacity-90"
                }`}
              >
                {item.cover_url ? (
                  // biome-ignore lint/performance/noImgElement: 封面来自对象存储，不走 next/image
                  <img
                    src={item.cover_url}
                    alt={item.desc?.slice(0, 20) || ""}
                    loading="lazy"
                    className="absolute inset-0 h-full w-full object-cover"
                  />
                ) : null}
                <div className="pointer-events-none absolute inset-0 bg-gradient-to-t from-black/60 via-transparent to-transparent" />
                {item.type === "image" && (
                  <span className="absolute right-1 top-1 inline-flex items-center gap-0.5 rounded bg-black/55 px-1 py-0.5 text-[10px] text-white/90">
                    <Images size={10} />
                    图文
                  </span>
                )}
                {isCurrent ? (
                  <div className="absolute inset-0 flex flex-col items-center justify-center gap-1.5 bg-black/55 text-xs text-white">
                    <PlayingBars />
                    播放中
                  </div>
                ) : (
                  <span className="absolute bottom-1 left-1 inline-flex items-center gap-0.5 text-[11px] text-white/90 drop-shadow">
                    <Heart size={11} />
                    {formatCount(item.likes)}
                  </span>
                )}
              </Link>
            );
          })}
        </div>
        {list.items && items.length <= 1 && singleHint && (
          <div className="py-6 text-center text-xs text-white/40">
            {singleHint}
          </div>
        )}
        {list.items && list.total > items.length && (
          <div className="py-6 text-center text-xs text-white/40">
            只列出前 {items.length} 个，共 {list.total} 个
          </div>
        )}
      </div>
    </div>
  );
});