import type { ReactNode } from "react";
import { ExternalLink } from "lucide-react";
import {
  groupTimelineByDate,
  type TimelineItem,
} from "@/lib/timelineBlocks";

type MdTimelineProps = {
  items: TimelineItem[];
  /** 每项正文已渲染的 React 节点（与 items 等长）；缺省则只显示纯文本 */
  renderBody?: (item: TimelineItem, index: number) => ReactNode;
};

/**
 * 按日分组的垂直时间线（更新树）。颜色走 CSS 令牌。
 */
export default function MdTimeline({ items, renderBody }: MdTimelineProps) {
  if (!items.length) {
    return <p className="meta px-1 py-2">暂无时间线条目</p>;
  }
  const groups = groupTimelineByDate(items);
  let flat = 0;

  return (
    <div className="j13-timeline" role="list" aria-label="时间线">
      {groups.map((g) => (
        <div key={g.date} className="j13-timeline-day">
          <div className="j13-timeline-day-label">
            <time dateTime={g.date}>{g.date}</time>
          </div>
          <ul className="j13-timeline-items">
            {g.items.map((it) => {
              const idx = flat++;
              return (
                <li key={`${g.date}-${idx}-${it.title}`} className="j13-timeline-item" role="listitem">
                  <span className="j13-timeline-dot" aria-hidden />
                  <div className="j13-timeline-card">
                    <div className="j13-timeline-head">
                      <h3 className="j13-timeline-title">{it.title}</h3>
                      {it.sourceUrl ? (
                        <a
                          href={it.sourceUrl}
                          className="j13-timeline-src"
                          target="_blank"
                          rel="noopener noreferrer"
                          data-tip="查看提交"
                          aria-label="查看提交"
                        >
                          <ExternalLink size={13} />
                        </a>
                      ) : null}
                    </div>
                    {renderBody ? (
                      <div className="j13-timeline-body">{renderBody(it, idx)}</div>
                    ) : it.body.trim() ? (
                      <div className="j13-timeline-body whitespace-pre-wrap">{it.body}</div>
                    ) : null}
                  </div>
                </li>
              );
            })}
          </ul>
        </div>
      ))}
    </div>
  );
}