import { ExternalLink } from "lucide-react";
import { Link } from "react-router";
import type { TimelineEvent, TimelineStage } from "~/api/tasks.ts";
import { LoadingState } from "~/components/console/empty-state.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { Timeline } from "~/components/console/timeline.tsx";

// 业务时间线(参考 MovieClaw task-activity):把观察 → 计划 → 下载 → 整理 → Agent 串成一个业务过程,
// 阶段计数与首页/侧栏同口径;每条事件都有文字说明,不只靠颜色。

export const STAGE_LABEL: Record<TimelineStage, string> = {
  observation: "发现",
  plan: "准备",
  download: "下载",
  organization: "整理",
  agent: "智能体",
  engine: "任务",
};

const ORDER: TimelineStage[] = ["observation", "plan", "download", "organization", "agent", "engine"];

export function BusinessTimeline({ events, loading }: { events: TimelineEvent[]; loading?: boolean }) {
  const counts = new Map<TimelineStage, number>();
  for (const e of events) counts.set(e.stage, (counts.get(e.stage) ?? 0) + 1);
  const ongoing = events.filter((e) => e.ongoing);
  return (
    <div className="space-y-3">
      <div className="flex flex-wrap gap-1.5">
        {ORDER.filter((s) => counts.get(s)).map((s) => {
          const bad = events.some((e) => e.stage === s && e.tone === "destructive");
          return (
            <StatusBadge key={s} tone={bad ? "destructive" : "neutral"}>
              {STAGE_LABEL[s]} · {counts.get(s)}
            </StatusBadge>
          );
        })}
      </div>
      {ongoing.length ? (
        <p className="text-caption text-muted-foreground">当前：{ongoing.map((e) => e.title).join("；")}</p>
      ) : null}
      {loading && !events.length ? (
        <LoadingState rows={3} />
      ) : (
        <Timeline
          items={events.map((e) => ({
            id: e.key,
            at: e.at,
            tone: e.tone,
            meta: STAGE_LABEL[e.stage],
            title: e.href ? (
              <Link to={e.href} className="inline-flex items-center gap-1 underline-offset-4 hover:underline">
                {e.title}
                <ExternalLink className="h-3 w-3" />
              </Link>
            ) : (
              e.title
            ),
            description: e.detail ?? undefined,
          }))}
        />
      )}
      {loading && events.length ? (
        <p className="text-meta text-muted-foreground">加载整理记录和引擎运行…</p>
      ) : null}
    </div>
  );
}