import type { AcquisitionPlan, PlanStatus } from "@umt/contracts";
import { ClipboardList } from "lucide-react";
import { useState } from "react";
import { Link } from "react-router";
import { PLAN_STATUS_LABEL, useDownloadTasks, usePlans } from "~/api/downloads.ts";
import { type DataColumn, DataTable } from "~/components/console/data-table.tsx";
import { DetailSection, DetailSheet } from "~/components/console/detail-sheet.tsx";
import { FilterBar, FilterSelect } from "~/components/console/filter-bar.tsx";
import { JsonView } from "~/components/console/json-view.tsx";
import { KvList } from "~/components/console/kv-list.tsx";
import { consolePath } from "~/components/console/nav.ts";
import { PageHeader } from "~/components/console/page-header.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { useQueryState } from "~/components/console/use-query-state.ts";
import { DownloadsTabs } from "~/components/downloads/downloads-tabs.tsx";
import { PRIORITY } from "~/components/library/labels.ts";
import { Button } from "~/components/ui/button.tsx";
import { relTime } from "~/components/workbench/release-fields.ts";
import { planReasonText } from "~/lib/labels.ts";
import { formatBytes, formatDateTime } from "~/lib/utils.ts";

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

const PURPOSE = { fill: "补缺", upgrade: "升级", replace_source: "换源" } as const;

const planTone = (s: PlanStatus) =>
  s === "failed" ? "destructive" : s === "completed" ? "success" : s === "expired" ? "warning" : "neutral";

export default function DownloadPlansPage() {
  const f = useQueryState(["status"] as const);
  const [openPlan, setOpenPlan] = useState<AcquisitionPlan | null>(null);
  const plans = usePlans((f.values.status || undefined) as PlanStatus | undefined);
  // 计划 → 下载任务:同一列表按 acquisitionPlanId 对上
  const downloads = useDownloadTasks({});
  const rows = plans.data?.pages.flatMap((p) => p.items);
  const linkedDownload = openPlan
    ? downloads.data?.pages.flatMap((p) => p.items).find((t) => t.acquisitionPlanId === openPlan.id)
    : undefined;

  const columns: DataColumn<AcquisitionPlan>[] = [
    {
      key: "purpose",
      header: "计划",
      cell: (p) => (
        <div className="min-w-0">
          <p className="text-foreground">
            {PURPOSE[p.purpose]} · 优先级 {PRIORITY[p.priority as keyof typeof PRIORITY] ?? p.priority}
          </p>
          <p className="truncate font-mono text-meta text-muted-foreground">{p.id.slice(0, 8)}</p>
        </div>
      ),
    },
    {
      key: "status",
      header: "状态",
      cell: (p) => <StatusBadge tone={planTone(p.status)}>{PLAN_STATUS_LABEL[p.status]}</StatusBadge>,
    },
    {
      key: "reserved",
      header: "预留空间",
      hideBelow: "md",
      align: "right",
      cell: (p) => <span className="tabular-nums">{formatBytes(p.reservedBytes, 1)}</span>,
    },
    {
      key: "reason",
      header: "说明",
      hideBelow: "lg",
      cell: (p) => <span className="line-clamp-1 text-muted-foreground">{planReasonText(p.statusReason) ?? "—"}</span>,
    },
    {
      key: "at",
      header: "创建",
      hideBelow: "sm",
      cell: (p) => <span className="whitespace-nowrap text-muted-foreground">{relTime(p.createdAt)}</span>,
    },
  ];

  return (
    <>
      <PageHeader title="下载面板" description="候选被选中后生成计划，同时预留版本目标、空间与预算。" />
      <DownloadsTabs />
      <FilterBar onReset={f.active ? f.reset : undefined}>
        <FilterSelect
          label="状态"
          value={f.values.status}
          onChange={(v) => f.set("status", v)}
          options={Object.entries(PLAN_STATUS_LABEL).map(([value, label]) => ({ value, label }))}
        />
      </FilterBar>
      <DataTable
        columns={columns}
        rows={rows}
        rowKey={(p) => p.id}
        loading={plans.isPending}
        error={plans.error}
        onRetry={() => void plans.refetch()}
        onRowClick={setOpenPlan}
        selectedKey={openPlan?.id}
        hasMore={plans.hasNextPage}
        onLoadMore={() => void plans.fetchNextPage()}
        loadingMore={plans.isFetchingNextPage}
        empty={{
          icon: ClipboardList,
          title: f.active ? "没有符合筛选的下载计划" : "还没有下载计划",
          description: f.active ? undefined : "候选被选中后出现在这里。",
        }}
      />

      <DetailSheet
        open={!!openPlan}
        onOpenChange={(o) => !o && setOpenPlan(null)}
        title={openPlan ? `${PURPOSE[openPlan.purpose]}计划` : ""}
        description={planReasonText(openPlan?.statusReason) ?? undefined}
        footer={
          linkedDownload ? (
            <Button asChild size="sm">
              <Link to={consolePath("downloads", linkedDownload.id)}>查看下载任务</Link>
            </Button>
          ) : null
        }
      >
        {openPlan ? (
          <>
            <KvList
              items={[
                {
                  label: "状态",
                  value: (
                    <StatusBadge tone={planTone(openPlan.status)}>{PLAN_STATUS_LABEL[openPlan.status]}</StatusBadge>
                  ),
                },
                { label: "优先级", value: openPlan.priority },
                { label: "预留空间", value: formatBytes(openPlan.reservedBytes, 1) },
                { label: "过期于", value: formatDateTime(openPlan.expiresAt) },
                { label: "创建", value: formatDateTime(openPlan.createdAt) },
                { label: "版本目标", value: openPlan.slotId, mono: true },
                { label: "资源", value: openPlan.sourceReleaseId, mono: true, wide: true },
              ]}
            />
            <DetailSection title="评估依据">
              <JsonView value={openPlan.evaluation} />
            </DetailSection>
            <JsonView label="预算预留" value={openPlan.budgetReservation} />
          </>
        ) : null}
      </DetailSheet>
    </>
  );
}