import type { Decision } from "@umt/contracts";
import { ArrowRight, Bell, CheckCheck } from "lucide-react";
import { useState } from "react";
import { Link, useNavigate } from "react-router";
import { useAttention } from "~/api/attention.ts";
import { EmptyState, ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { consolePath } from "~/components/console/nav.ts";
import { recordPath } from "~/components/console/record-sheet.tsx";
import { SEVERITY } from "~/components/library/labels.ts";
import { Button } from "~/components/ui/button.tsx";
import { Popover, PopoverContent, PopoverTrigger } from "~/components/ui/popover.tsx";
import { formatRelative } from "~/lib/labels.ts";
import { cn } from "~/lib/utils.ts";

// 顶栏铃铛(2026-10-06 起只放两类):需要你批准的智能体操作(会话里的审批 / 方案选择、计划审批、原站页面等你接手)
// 与系统健康问题(站点不可达、下载器离线、下载目录读不到容量、磁盘空间不足、媒体库目录离线,恢复后自动消失)。
// 整理问题在整理记录里处理,集数待确认在订阅详情 / 作品页集数映射里看,不进铃铛。

const RECENT = 6;
const DOT = { info: "bg-muted-foreground/60", warning: "bg-warning", critical: "bg-destructive" } as const;

/** 等你批准的事项点开去哪:智能体会话、下载、下载任务;其余去智能体页 */
export function approvalHref(d: Pick<Decision, "subjectType" | "subjectId" | "agentRunId">): string {
  if (d.subjectType === "agent_run" && d.subjectId) return consolePath("agent", d.subjectId);
  if (d.agentRunId) return consolePath("agent", d.agentRunId);
  if (d.subjectType === "acquisition_plan" && d.subjectId)
    return `${consolePath("downloads")}?plan=${encodeURIComponent(d.subjectId)}`;
  if (d.subjectType === "download_task" && d.subjectId) return recordPath("downloads", d.subjectId);
  return consolePath("agent");
}

export const HEALTH_HREF = `${consolePath("status")}#attention`;

function Group({
  title,
  total,
  items,
  href,
  onGo,
}: {
  title: string;
  total: number;
  items: Decision[];
  href: (d: Decision) => string;
  onGo: () => void;
}) {
  if (!total) return null;
  return (
    <section className="pt-1">
      <p className="flex items-center justify-between gap-2 px-2 py-1.5 text-label font-semibold tracking-[0.18em] text-muted-foreground uppercase">
        <span>{title}</span>
        <span className="tracking-normal tabular-nums">{total}</span>
      </p>
      <ul>
        {items.slice(0, RECENT).map((d) => (
          <li key={d.id}>
            <Link
              to={href(d)}
              onClick={onGo}
              className="block rounded-lg px-2 py-2 outline-none transition-colors hover:bg-foreground/[0.06] focus-visible:bg-foreground/[0.06] focus-visible:ring-2 focus-visible:ring-ring/50"
            >
              <span className="line-clamp-2 text-body break-words text-foreground">{d.title}</span>
              <span className="mt-0.5 flex items-center gap-1.5 text-meta text-muted-foreground">
                <span aria-hidden className={cn("h-1.5 w-1.5 shrink-0 rounded-full", DOT[d.severity])} />
                {SEVERITY[d.severity].label} · {formatRelative(d.createdAt)}
              </span>
            </Link>
          </li>
        ))}
      </ul>
    </section>
  );
}

/** bare:放在顶栏的玻璃胶囊里时触发器不自带玻璃 */
export function InboxBell({ bare = false }: { bare?: boolean }) {
  const q = useAttention();
  const [open, setOpen] = useState(false);
  const navigate = useNavigate();
  const approvals = q.data?.approvals ?? { total: 0, items: [] };
  const health = q.data?.health ?? { total: 0, items: [] };
  const total = approvals.total + health.total;
  const label = total ? `需要你关注 ${total} 项` : "通知";

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>
        <Button
          variant={bare ? "ghost" : "outline"}
          size="icon-sm"
          className={cn("relative", bare && "data-[state=open]:bg-foreground/[0.08] data-[state=open]:text-foreground")}
          aria-label={label}
          title={label}
        >
          <Bell className="h-4 w-4" />
          {total ? (
            <span className="absolute -top-0.5 -right-0.5 min-w-4 rounded-full bg-primary px-1 text-center text-micro leading-4 font-semibold text-primary-foreground tabular-nums">
              {total > 99 ? "99+" : total}
            </span>
          ) : null}
        </Button>
      </PopoverTrigger>
      <PopoverContent
        align="end"
        sideOffset={8}
        collisionPadding={16}
        aria-label="通知"
        className="pg-float-solid flex max-h-[var(--radix-popover-content-available-height)] w-[min(22rem,calc(100vw-2rem))] flex-col overflow-hidden p-2"
      >
        <div className="flex shrink-0 items-center justify-between gap-3 border-b border-border px-2 pt-1 pb-2">
          <p className="text-sm font-semibold text-foreground">通知</p>
          <Button
            variant="ghost"
            size="xs"
            onClick={() => {
              setOpen(false);
              navigate(consolePath("status"));
            }}
          >
            运行状态
            <ArrowRight />
          </Button>
        </div>
        {q.isPending ? (
          <LoadingState className="px-4 py-6" />
        ) : q.isError ? (
          <ErrorState plain error="稍后再试" className="py-8" />
        ) : total === 0 ? (
          <EmptyState plain icon={CheckCheck} title="没有等你批准的操作，系统运行正常" className="py-8" />
        ) : (
          <div className="min-h-0 overflow-y-auto overscroll-contain pt-1">
            <Group
              title="等你批准"
              total={approvals.total}
              items={approvals.items}
              href={approvalHref}
              onGo={() => setOpen(false)}
            />
            <Group
              title="系统健康"
              total={health.total}
              items={health.items}
              href={() => HEALTH_HREF}
              onGo={() => setOpen(false)}
            />
          </div>
        )}
      </PopoverContent>
    </Popover>
  );
}