import type { LibraryItem, LibraryListQuery, MediaKind, SlotStatus } from "@umt/contracts";
import { Download, Library as LibraryIcon, RotateCw } from "lucide-react";
import { useDeferredValue } from "react";
import { Link, useNavigate, useSearchParams } from "react-router";
import { useLibraryList } from "~/api/library.ts";
import { type DataColumn, DataTable } from "~/components/console/data-table.tsx";
import { FilterBar, FilterSelect } from "~/components/console/filter-bar.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 { ENTITY_STATUS, MEDIA_KIND, opts, SLOT_STATUS, SLOT_STATUS_ORDER } from "~/components/library/labels.ts";
import { CoverPlaceholder, relTime, Tone } from "~/components/library/parts.tsx";
import { Button } from "~/components/ui/button.tsx";

const FILTERS: { value: NonNullable<LibraryListQuery["filter"]>; label: string }[] = [
  { value: "gap", label: "有缺口" },
  { value: "attention", label: "需处理" },
  { value: "downloading", label: "下载中" },
  { value: "satisfied", label: "已满足" },
];

/** 各 Slot 状态计数:只列非零项,文字 + 语气 */
function SlotSummary({ counts }: { counts: LibraryItem["slotCounts"] }) {
  const parts = SLOT_STATUS_ORDER.filter((s) => counts[s] > 0);
  if (parts.length === 0) return <span className="text-meta text-muted-foreground">未设目标</span>;
  return (
    <div className="flex flex-wrap gap-1">
      {parts.map((s: SlotStatus) => (
        <StatusBadge key={s} tone={SLOT_STATUS[s].tone}>
          {SLOT_STATUS[s].label} {counts[s]}
        </StatusBadge>
      ))}
    </div>
  );
}

export default function LibraryPage() {
  const [sp, setSp] = useSearchParams();
  const navigate = useNavigate();
  const kind = (sp.get("kind") ?? "") as MediaKind | "";
  const filter = (sp.get("filter") ?? "") as LibraryListQuery["filter"] | "";
  const q = sp.get("q") ?? "";
  const deferredQ = useDeferredValue(q.trim());

  const set = (k: string, v: string) =>
    setSp(
      (prev) => {
        const next = new URLSearchParams(prev);
        if (v) next.set(k, v);
        else next.delete(k);
        return next;
      },
      { replace: true },
    );

  const list = useLibraryList({
    kind: kind || undefined,
    filter: filter || undefined,
    q: deferredQ || undefined,
  });
  const rows = list.data?.pages.flatMap((p) => p.items);
  const filtered = !!(kind || filter || q);

  const columns: DataColumn<LibraryItem>[] = [
    {
      key: "title",
      header: "作品",
      cell: (r) => (
        <div className="flex min-w-0 items-center gap-3">
          <CoverPlaceholder title={r.entity.title} kind={r.entity.kind} small className="h-14 w-10" />
          <div className="min-w-0">
            <Link
              to={consolePath("library", r.entity.id)}
              onClick={(e) => e.stopPropagation()}
              className="block max-w-[14rem] truncate font-medium text-foreground hover:underline sm:max-w-xs"
            >
              {r.entity.title}
            </Link>
            <p className="truncate text-meta text-muted-foreground">
              {MEDIA_KIND[r.entity.kind]}
              {r.entity.year ? ` · ${r.entity.year}` : ""}
              {r.entity.originalTitle && r.entity.originalTitle !== r.entity.title
                ? ` · ${r.entity.originalTitle}`
                : ""}
            </p>
            {r.entity.status !== "active" ? <Tone v={ENTITY_STATUS[r.entity.status]} className="mt-1" /> : null}
          </div>
        </div>
      ),
    },
    { key: "slots", header: "收录目标", cell: (r) => <SlotSummary counts={r.slotCounts} /> },
    {
      key: "assets",
      header: "资产",
      align: "right",
      hideBelow: "sm",
      cell: (r) => <span className="tabular-nums">{r.assetCount}</span>,
    },
    {
      key: "dl",
      header: "下载中",
      align: "right",
      hideBelow: "md",
      cell: (r) =>
        r.activeDownloads ? (
          <span className="inline-flex items-center gap-1 tabular-nums">
            <Download className="h-3.5 w-3.5 text-muted-foreground" />
            {r.activeDownloads}
          </span>
        ) : (
          <span className="text-muted-foreground">—</span>
        ),
    },
    {
      key: "org",
      header: "最近入库",
      hideBelow: "lg",
      cell: (r) => <span className="text-meta text-muted-foreground">{relTime(r.lastOrganizedAt)}</span>,
    },
  ];

  return (
    <>
      <PageHeader
        title="媒体库"
        description="已登记资产或正在追踪的作品;每个作品按独立收录目标(Slot)显示满足情况"
        actions={
          <Button variant="outline" size="sm" onClick={() => list.refetch()} disabled={list.isFetching}>
            <RotateCw className={list.isFetching ? "animate-spin" : undefined} />
            刷新
          </Button>
        }
      />
      <FilterBar
        search={{ value: q, onChange: (v) => set("q", v), placeholder: "标题 / 原名 / 别名" }}
        onReset={filtered ? () => setSp(new URLSearchParams(), { replace: true }) : undefined}
      >
        <FilterSelect label="类型" value={kind} onChange={(v) => set("kind", v)} options={opts(MEDIA_KIND)} />
        <FilterSelect label="状态" value={filter ?? ""} onChange={(v) => set("filter", v)} options={FILTERS} />
      </FilterBar>
      <DataTable
        columns={columns}
        rows={rows}
        rowKey={(r) => r.entity.id}
        onRowClick={(r) => navigate(consolePath("library", r.entity.id))}
        loading={list.isPending}
        error={list.error}
        onRetry={() => list.refetch()}
        empty={
          filtered
            ? { title: "没有符合条件的作品", description: "换个关键字或清除筛选试试。", icon: LibraryIcon }
            : {
                title: "媒体库还是空的",
                description: "登记库根并完成首次扫描,或新建订阅后,作品会出现在这里。",
                icon: LibraryIcon,
                action: (
                  <Button asChild variant="outline" size="sm">
                    <Link to={consolePath("subscriptions")}>去新建订阅</Link>
                  </Button>
                ),
              }
        }
        hasMore={!!list.hasNextPage}
        onLoadMore={() => list.fetchNextPage()}
        loadingMore={list.isFetchingNextPage}
      />
    </>
  );
}