import { ChevronRight } from "lucide-react";
import type { ReactNode } from "react";
import { renderMarkdownToReact } from "@/components/markdown/renderMarkdown";
import { ENTRY_TITLE_NUM_RE, type EntryItem } from "@/lib/entryBlocks";

/** 标签 chip："主:次" 或 "主=次" 形式渲染主次两段，否则单段；不做语义配色，保持字段通用 */
function EntryTag({ tag }: { tag: string }) {
  const idx = tag.search(/[:：=]/);
  const main = idx >= 0 ? tag.slice(0, idx) : tag;
  const sub = idx >= 0 ? tag.slice(idx + 1) : "";
  return (
    <span
      className="inline-flex items-baseline gap-1 rounded-full px-2.5 py-0.5 text-[11.5px] leading-5"
      style={{ background: "var(--panel-2)", border: "1px solid var(--line)" }}
    >
      <span className="font-semibold" style={{ color: "var(--ink-2)" }}>
        {main}
      </span>
      {sub ? (
        <span style={{ color: "var(--ink-3)" }}>{sub}</span>
      ) : null}
    </span>
  );
}

/**
 * 条目卡纯展示视图：编号标题 + 标签 chips + 高亮摘要 + 通用字段行 + 折叠来源。
 * 字段名不限定（成本/收益/备注只是书写约定），任何书籍可定义自己的字段；
 * markdown 片段由调用方注入（服务端 renderMarkdownToReact / 客户端 ReactMarkdown 预览）。
 */
export function MdEntriesView({
  items,
  renderMd,
  titleIds,
}: {
  items: EntryItem[];
  renderMd: (text: string) => ReactNode;
  /** 与目录共享的标题锚点 id（按条目顺序；缺省不挂 id） */
  titleIds?: (string | undefined)[];
}) {
  return (
    <div className="my-4 -mx-2 flex flex-col gap-4 sm:-mx-3">
      {items.map((it, i) => (
        <article
          key={i}
          className="j13-entry-card rounded-2xl px-3 py-4 sm:px-4 sm:py-5"
          style={{
            border: "1px solid var(--line)",
            // 极浅灰卡底：panel-2 半量混入 panel，深浅色模式各自成立
            background: "color-mix(in srgb, var(--panel-2) 50%, var(--panel))",
          }}
        >
          {!it.plain ? (
            <h2
              id={titleIds?.[i]}
              className="flex items-baseline gap-2.5"
              style={{
                color: "var(--ink)",
                scrollMarginTop: 90,
                // 二级标题字号（移动端经 --entry-title-size 收小，见 globals.css）；
                // 覆盖 .prose-content h2 的外边距与底边线（卡内不需要）
                fontSize: "var(--entry-title-size, 1.4rem)",
                fontWeight: 700,
                lineHeight: 1.35,
                margin: 0,
                padding: 0,
                border: "none",
              }}
            >
              {ENTRY_TITLE_NUM_RE.test(it.title) ? null : (
                <span
                  className="tabular-nums text-[12.5px] font-semibold shrink-0"
                  style={{ color: "var(--ink-3)" }}
                >
                  {i + 1}
                </span>
              )}
              <span className="min-w-0">{it.title}</span>
            </h2>
          ) : null}

          {it.tags.length > 0 ? (
            <div className="mt-2 flex flex-wrap gap-1.5">
              {it.tags.map((tag, ti) => (
                <EntryTag key={ti} tag={tag} />
              ))}
            </div>
          ) : null}

          {it.summary?.trim() ? (
            <div
              className="j13-entry-summary mt-3 rounded-xl px-3.5 py-3 text-[14px] leading-relaxed [&>p]:my-0"
              style={{
                background: "var(--accent-soft)",
                borderLeft: "3px solid var(--accent)",
                color: "var(--ink)",
              }}
            >
              {renderMd(it.summary)}
            </div>
          ) : null}

          {it.fields.length > 0 ? (
            <dl className="mt-3 flex flex-col gap-2.5">
              {it.fields.map((f, fi) => (
                <div
                  key={fi}
                  className="grid grid-cols-1 gap-y-0.5 sm:grid-cols-[76px_minmax(0,1fr)] sm:gap-x-3 sm:gap-y-0"
                >
                  <dt className="text-[12.5px] leading-[22px]" style={{ color: "var(--ink-3)" }}>
                    {f.label}
                  </dt>
                  <dd
                    className="min-w-0 text-[14px] leading-relaxed [&>p]:my-0 [&>ul]:my-1 [&>ol]:my-1"
                    style={{
                      // 正文用正常墨色；备注/来源类说明性字段保持浅灰
                      color:
                        f.label === "备注" || f.label === "来源"
                          ? "var(--ink-2)"
                          : "var(--ink)",
                    }}
                  >
                    {f.value.trim() ? renderMd(f.value) : null}
                  </dd>
                </div>
              ))}
            </dl>
          ) : null}

          {it.sources.length > 0 ? (
            <details className="group mt-3">
              <summary
                className="inline-flex cursor-pointer select-none list-none items-center gap-1 text-[12.5px] font-medium [&::-webkit-details-marker]:hidden"
                style={{ color: "var(--ink-2)" }}
              >
                <ChevronRight
                  size={13}
                  className="transition-transform group-open:rotate-90"
                  aria-hidden
                />
                来源 · {it.sources.length} 条
              </summary>
              <div className="mt-2 flex flex-col gap-2">
                {it.sources.map((s, si) => (
                  <div
                    key={si}
                    className="flex gap-2 text-[12.5px] leading-relaxed"
                    style={{ color: "var(--ink-2)" }}
                  >
                    <span className="tabular-nums shrink-0" style={{ color: "var(--ink-3)" }}>
                      {si + 1}.
                    </span>
                    <div className="min-w-0">
                      <span>{s.text}</span>
                      {s.url ? (
                        <a
                          href={s.url}
                          target="_blank"
                          rel="noopener noreferrer nofollow"
                          className="block break-all hover:text-[var(--accent)]"
                          style={{ color: "var(--ink-3)" }}
                        >
                          {s.url}
                        </a>
                      ) : null}
                    </div>
                  </div>
                ))}
              </div>
            </details>
          ) : null}
        </article>
      ))}
    </div>
  );
}

/** 服务端条目卡：markdown 片段走站点统一渲染管线（Shiki 等） */
export default async function MdEntries({
  items,
  titleIds,
}: {
  items: EntryItem[];
  titleIds?: (string | undefined)[];
}) {
  const cache = new Map<string, ReactNode>();
  await Promise.all(
    items.flatMap((it) => {
      const put = async (text?: string) => {
        if (!text?.trim() || cache.has(text)) return;
        cache.set(text, await renderMarkdownToReact(text));
      };
      return [put(it.summary), ...it.fields.map((f) => put(f.value))];
    })
  );
  return <MdEntriesView items={items} titleIds={titleIds} renderMd={(t) => cache.get(t) ?? null} />;
}