import { useQueryClient } from "@tanstack/react-query";
import { ExternalLink, RotateCw } from "lucide-react";
import { Link, useSearchParams } from "react-router";
import { useEngineRun, useEngineStats } from "~/api/engine.ts";
import { DetailSheet } from "~/components/console/detail-sheet.tsx";
import { ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { PageHeader } from "~/components/console/page-header.tsx";
import { ScheduleBoard } from "~/components/schedules/schedule-board.tsx";
import { runTitle } from "~/components/tasks/labels.ts";
import { RunActions, TaskDetailBody, TaskStatusLine } from "~/components/tasks/task-detail.tsx";
import { type StreamFilters, type StreamTab, TaskStream } from "~/components/tasks/task-stream.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Tabs, TabsList, TabsTrigger } from "~/components/ui/tabs.tsx";
import { qk } from "~/lib/query-keys.ts";
import { legacyRedirectLoader } from "./redirects.ts";

export const meta = () => [{ title: "任务 · UHD 媒体自动化控制台" }];

// 旧的 ?tab=downloads / plans / business 跳到下载面板 / 下载计划 / 任务流
export const clientLoader = legacyRedirectLoader;

type Tab = StreamTab | "plan";
const TABS: Tab[] = ["all", "active", "failed", "plan"];
const FILTER_KEYS: (keyof StreamFilters)[] = ["status", "kind", "ref", "source", "since", "workflow"];

function Count({ n }: { n: number | undefined }) {
  if (!n) return null;
  return <span className="text-meta text-muted-foreground tabular-nums">{n > 999 ? "999+" : n}</span>;
}

function RunSheet({
  runId,
  onOpen,
  onClose,
}: {
  runId: string | null;
  onOpen: (id: string) => void;
  onClose: () => void;
}) {
  const q = useEngineRun(runId ?? undefined);
  const r = q.data;
  return (
    <DetailSheet
      open={!!runId}
      onOpenChange={(o) => !o && onClose()}
      width="lg"
      title={r ? runTitle(r) : "任务"}
      description={r ? <TaskStatusLine r={r} /> : undefined}
      footer={
        r ? (
          <>
            <Button asChild variant="ghost" size="sm">
              <Link to={`/console/tasks/${encodeURIComponent(r.id)}`}>
                <ExternalLink />
                独立页面
              </Link>
            </Button>
            <RunActions r={r} onOpenRun={onOpen} />
          </>
        ) : null
      }
    >
      {q.isPending ? (
        <LoadingState rows={6} />
      ) : q.isError ? (
        <ErrorState plain error={q.error} onRetry={() => q.refetch()} />
      ) : r ? (
        <TaskDetailBody r={r} onOpenRun={onOpen} />
      ) : null}
    </DetailSheet>
  );
}

export default function TasksPage() {
  const qc = useQueryClient();
  const [params, setParams] = useSearchParams();
  const raw = params.get("tab") as Tab | null;
  const tab: Tab = raw && TABS.includes(raw) ? raw : "all";
  const runId = params.get("run");
  const filters = Object.fromEntries(FILTER_KEYS.map((k) => [k, params.get(k) ?? ""])) as StreamFilters;
  const stats = useEngineStats();
  const by = stats.data?.byStatus;

  const update = (fn: (p: URLSearchParams) => void) =>
    setParams(
      (prev) => {
        const next = new URLSearchParams(prev);
        fn(next);
        return next;
      },
      { replace: true },
    );
  const setFilter = (k: keyof StreamFilters, v: string) =>
    update((p) => {
      if (v) p.set(k, v);
      else p.delete(k);
    });

  return (
    <>
      <PageHeader
        title="任务"
        description="每次运行都是一条任务，不论定时、事件、手动还是 Agent 触发。"
        actions={
          <Button
            variant="outline"
            size="sm"
            onClick={() => {
              qc.invalidateQueries({ queryKey: qk.all("engine") });
              qc.invalidateQueries({ queryKey: qk.all("schedules") });
            }}
          >
            <RotateCw />
            刷新
          </Button>
        }
      />
      <Tabs
        value={tab}
        onValueChange={(v) =>
          update((p) => {
            p.set("tab", v);
            p.delete("job");
            if (v !== "all") p.delete("status");
          })
        }
      >
        <TabsList>
          <TabsTrigger value="all">全部</TabsTrigger>
          <TabsTrigger value="active">
            进行中
            <Count n={by ? (by.running ?? 0) + (by.pending ?? 0) : undefined} />
          </TabsTrigger>
          <TabsTrigger value="failed">
            失败
            <Count n={by?.failed} />
          </TabsTrigger>
          <TabsTrigger value="plan">计划</TabsTrigger>
        </TabsList>
      </Tabs>
      <div className="mt-4">
        {tab === "plan" ? (
          <ScheduleBoard highlightJob={params.get("job") ?? undefined} />
        ) : (
          <TaskStream
            tab={tab}
            filters={filters}
            setFilter={setFilter}
            resetFilters={() =>
              update((p) => {
                for (const k of FILTER_KEYS) p.delete(k);
              })
            }
            onOpen={(id) => update((p) => p.set("run", id))}
            selectedId={runId}
          />
        )}
      </div>
      <RunSheet
        runId={runId}
        onOpen={(id) => update((p) => p.set("run", id))}
        onClose={() => update((p) => p.delete("run"))}
      />
    </>
  );
}