import type { FacetCount, ReleaseSearchPage, SearchRelease } from "@umt/contracts";
import {
  ArrowDown,
  ArrowDownWideNarrow,
  ArrowUp,
  ArrowUpNarrowWide,
  Bot,
  ChevronDown,
  Download,
  ExternalLink,
  PackageSearch,
  RefreshCw,
  TriangleAlert,
} from "lucide-react";
import { useEffect, useMemo, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import { type ReleaseSearchFilters, useRefreshReleaseSearch, useReleaseSearch } from "~/api/search.ts";
import { EmptyState, ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { FilterSelect } from "~/components/console/filter-bar.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { ChipToggleGroup } from "~/components/library/parts.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Input } from "~/components/ui/input.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { relTime } from "~/components/workbench/release-fields.ts";
import { errorMessage } from "~/lib/api.ts";
import { cn, formatBytes } from "~/lib/utils.ts";
import { delegateToAgent, SearchDownloadDialog } from "./search-download-dialog.tsx";
import { gbToBytes, INVENTORY_STATE, promoLabel, SITE_STATUS, SORT_OPTIONS } from "./search-labels.ts";

// 资源段(SEARCH-2 第二阶段):按作品或关键词、在选中的站点上搜;筛选(站点/分辨率/来源/大小/免费/H&R)、排序、游标;
// 行操作同站点工作台(库存叠加、下载、委托 Agent)。

/** URL 里的资源筛选(字符串形态,空串 = 不筛) */
export type ReleaseFilterState = {
  sites: string;
  resolution: string;
  source: string;
  minGb: string;
  maxGb: string;
  free: string;
  hr: string;
  sort: string;
  order: string;
};
export const RELEASE_FILTER_KEYS = [
  "sites",
  "resolution",
  "source",
  "minGb",
  "maxGb",
  "free",
  "hr",
  "sort",
  "order",
] as const satisfies readonly (keyof ReleaseFilterState)[];

/** 搜什么:关键词,或按作品(服务端生成查询词) */
export type ReleaseTarget = { q?: string; entityId?: string; tmdb?: string };

/** URL 参数 work → 搜索目标:local:<id> / tmdb:<type>:<id> / q:<关键词> */
export function parseWorkRef(ref: string): ReleaseTarget | null {
  if (ref.startsWith("local:")) return { entityId: ref.slice(6) };
  const m = /^tmdb:(movie|tv):(\d+)$/.exec(ref);
  if (m) return { tmdb: `${m[1]}:${m[2]}` };
  if (ref.startsWith("q:") && ref.slice(2).trim()) return { q: ref.slice(2).trim() };
  return null;
}

export function toApiFilters(target: ReleaseTarget, f: ReleaseFilterState, siteIds = ""): ReleaseSearchFilters {
  const bool = (v: string) => (v === "true" || v === "false" ? v : undefined);
  const sort = SORT_OPTIONS.some((o) => o.value === f.sort) ? (f.sort as ReleaseSearchFilters["sort"]) : undefined;
  return {
    ...target,
    sites: siteIds || undefined,
    siteFilter: f.sites || undefined,
    resolution: f.resolution || undefined,
    source: f.source || undefined,
    minSize: gbToBytes(f.minGb),
    maxSize: gbToBytes(f.maxGb),
    free: bool(f.free),
    hr: bool(f.hr),
    sort,
    order: f.order === "asc" ? "asc" : f.order === "desc" ? "desc" : undefined,
  };
}

const csvList = (s: string) => (s ? s.split(",").filter(Boolean) : []);

export function ReleaseResults({
  target,
  siteIds,
  filters,
  setFilter,
  resetFilters,
  onChangeSites,
}: {
  target: ReleaseTarget;
  /** 选中的站点(逗号分隔);空 = 服务端按默认站点设置 */
  siteIds: string;
  onChangeSites?: () => void;
  filters: ReleaseFilterState;
  setFilter: (k: keyof ReleaseFilterState, v: string) => void;
  resetFilters: () => void;
}) {
  const api = useMemo(() => toApiFilters(target, filters, siteIds), [target, filters, siteIds]);
  const res = useReleaseSearch(api);
  const refresh = useRefreshReleaseSearch();
  const pages = res.data?.pages ?? [];
  const first = pages[0];
  const rows = useMemo(() => pages.flatMap((p) => p.items), [pages]);
  const [dl, setDl] = useState<SearchRelease | null>(null);
  const filtered = RELEASE_FILTER_KEYS.some((k) => k !== "sort" && k !== "order" && !!filters[k]);

  return (
    <section aria-labelledby="search-releases" className="min-w-0">
      <div className="mb-3 flex flex-wrap items-end justify-between gap-2">
        <div className="min-w-0">
          <h2 id="search-releases" className="text-body font-semibold text-foreground">
            资源
            {first ? (
              <span className="ml-2 text-caption font-normal text-muted-foreground tabular-nums">
                {first.total === first.unfilteredTotal
                  ? `${first.total} 条`
                  : `${first.total} / ${first.unfilteredTotal} 条`}
              </span>
            ) : null}
          </h2>
          {first ? (
            <p className="mt-0.5 text-meta break-words text-muted-foreground tabular-nums">
              {first.sites.length} 个站点 · {first.cached ? "缓存结果" : "站点实时结果"} · 抓取于{" "}
              {relTime(first.fetchedAt)} · {first.tookMs} ms
              {first.queries?.length ? ` · 查询词 ${first.queries.map((x) => `「${x}」`).join("")}` : ""}
            </p>
          ) : null}
        </div>
        <div className="flex flex-wrap gap-1">
          {onChangeSites ? (
            <Button variant="ghost" size="sm" onClick={onChangeSites}>
              换站点
            </Button>
          ) : null}
          <Button
            variant="outline"
            size="sm"
            disabled={refresh.isPending || res.isFetching}
            onClick={() => refresh.mutate(api, { onError: (e) => toast.error(errorMessage(e, "刷新失败")) })}
          >
            <RefreshCw className={cn(refresh.isPending && "animate-spin")} />
            {refresh.isPending ? "查询中…" : "刷新"}
          </Button>
        </div>
      </div>

      {first ? <CoverageNotice page={first} /> : null}

      {first ? (
        <Filters page={first} filters={filters} setFilter={setFilter} onReset={filtered ? resetFilters : undefined} />
      ) : null}

      <div className="pg-slab min-w-0 overflow-hidden rounded-xl">
        {res.isPending ? (
          <div className="p-4">
            <p className="mb-3 text-meta text-muted-foreground">正在查询各站点，最慢约 15 秒…</p>
            <LoadingState rows={4} />
          </div>
        ) : res.isError && !rows.length ? (
          <ErrorState plain error={res.error} onRetry={() => res.refetch()} />
        ) : rows.length === 0 ? (
          <EmptyState
            plain
            icon={PackageSearch}
            title={filtered ? "没有符合筛选条件的资源" : "所选站点都没有找到资源"}
            description={filtered ? "放宽筛选条件再看。" : "换站点或换关键词再搜，或到站点页检查站点状态。"}
            className="py-12"
          />
        ) : (
          <ul className="divide-y divide-border/60">
            {rows.map((r) => (
              <ReleaseRow key={r.key} r={r} onDownload={() => setDl(r)} />
            ))}
          </ul>
        )}
        {rows.length > 0 && res.hasNextPage ? (
          <div className="flex justify-center border-t border-border/60 px-4 py-3">
            <Button variant="outline" size="sm" onClick={() => res.fetchNextPage()} disabled={res.isFetchingNextPage}>
              {res.isFetchingNextPage ? "加载中…" : "加载更多"}
            </Button>
          </div>
        ) : null}
      </div>

      {dl ? <SearchDownloadDialog release={dl} open={!!dl} onOpenChange={(o) => !o && setDl(null)} /> : null}
    </section>
  );
}

/** 部分站点失败 / 跳过:列出站点,其余结果照常 */
function CoverageNotice({ page }: { page: ReleaseSearchPage }) {
  const [open, setOpen] = useState(false);
  const skipped = page.sites.filter((s) => s.status === "skipped");
  const ok = page.sites.filter((s) => s.status === "ok").length;
  return (
    <div className="mb-3 space-y-2">
      {page.partial ? (
        <div className="flex gap-2 rounded-xl border border-warning/40 bg-warning/10 px-3 py-2.5 text-caption text-foreground">
          <TriangleAlert className="mt-0.5 h-4 w-4 shrink-0 text-warning" />
          <div className="min-w-0">
            <p>
              {page.failedSites.length} 个站点没有返回结果，下面只有 {ok} 个站点的资源。
            </p>
            <ul className="mt-1 flex flex-wrap gap-x-3 gap-y-0.5 text-meta text-muted-foreground">
              {page.failedSites.map((s) => (
                <li key={s.siteId} className="break-all" title={s.error ?? undefined}>
                  {s.siteName}:{SITE_STATUS[s.status]}
                  {s.error ? `(${s.error})` : ""}
                </li>
              ))}
            </ul>
          </div>
        </div>
      ) : null}
      {skipped.length ? (
        <div className="text-meta text-muted-foreground">
          <button
            type="button"
            onClick={() => setOpen((v) => !v)}
            aria-expanded={open}
            className="inline-flex cursor-pointer items-center gap-1 hover:text-foreground"
          >
            <ChevronDown className={cn("h-3 w-3 transition-transform duration-micro", open && "rotate-180")} />
            {skipped.length} 个站点未参与搜索
          </button>
          {open ? (
            <ul className="mt-1 space-y-0.5 pl-4">
              {skipped.map((s) => (
                <li key={s.siteId} className="break-all">
                  {s.siteName}:{s.error ?? "站点不支持搜索"}
                </li>
              ))}
            </ul>
          ) : null}
        </div>
      ) : null}
    </div>
  );
}

const facetOpts = (items: FacetCount[]) =>
  items.map((f) => ({ value: f.value, label: `${f.value === "unknown" ? "未知" : f.label} ${f.count}` }));

function Filters({
  page,
  filters,
  setFilter,
  onReset,
}: {
  page: ReleaseSearchPage;
  filters: ReleaseFilterState;
  setFilter: (k: keyof ReleaseFilterState, v: string) => void;
  onReset?: () => void;
}) {
  const [minGb, setMinGb] = useState(filters.minGb);
  const [maxGb, setMaxGb] = useState(filters.maxGb);
  useEffect(() => setMinGb(filters.minGb), [filters.minGb]);
  useEffect(() => setMaxGb(filters.maxGb), [filters.maxGb]);
  const facets: { key: "sites" | "resolution" | "source"; label: string; items: FacetCount[] }[] = [
    { key: "sites", label: "站点", items: page.facets.sites },
    { key: "resolution", label: "分辨率", items: page.facets.resolutions },
    { key: "source", label: "来源", items: page.facets.sources },
  ];
  const desc = filters.order !== "asc";

  return (
    <div className="mb-3 space-y-2.5">
      {facets
        .filter((f) => f.items.length > 0)
        .map((f) => (
          <div key={f.key} className="flex min-w-0 flex-wrap items-start gap-2">
            <span className="w-12 shrink-0 pt-1 text-meta text-muted-foreground">{f.label}</span>
            <div className="min-w-0 flex-1">
              <ChipToggleGroup
                label={f.label}
                options={facetOpts(f.items)}
                value={csvList(filters[f.key])}
                onChange={(v) => setFilter(f.key, v.join(","))}
              />
            </div>
          </div>
        ))}
      <div className="flex flex-wrap items-center gap-2">
        <div className="flex items-center gap-1.5">
          <span className="text-meta text-muted-foreground">大小</span>
          <Input
            inputMode="decimal"
            value={minGb}
            onChange={(e) => setMinGb(e.target.value)}
            onBlur={() => setFilter("minGb", minGb.trim())}
            onKeyDown={(e) => e.key === "Enter" && setFilter("minGb", minGb.trim())}
            placeholder="最小"
            aria-label="最小大小(GB)"
            className="h-8 w-20"
          />
          <span className="text-meta text-muted-foreground">–</span>
          <Input
            inputMode="decimal"
            value={maxGb}
            onChange={(e) => setMaxGb(e.target.value)}
            onBlur={() => setFilter("maxGb", maxGb.trim())}
            onKeyDown={(e) => e.key === "Enter" && setFilter("maxGb", maxGb.trim())}
            placeholder="最大"
            aria-label="最大大小(GB)"
            className="h-8 w-20"
          />
          <span className="text-meta text-muted-foreground">GB</span>
        </div>
        <FilterSelect
          label="免费"
          value={filters.free}
          onChange={(v) => setFilter("free", v)}
          options={[
            { value: "true", label: "只看免费" },
            { value: "false", label: "排除免费" },
          ]}
        />
        <FilterSelect
          label="H&R"
          value={filters.hr}
          onChange={(v) => setFilter("hr", v)}
          options={[
            { value: "true", label: "只看 H&R" },
            { value: "false", label: "排除 H&R" },
          ]}
        />
        <div className="flex items-center gap-1">
          <Select value={filters.sort || "default"} onValueChange={(v) => setFilter("sort", v === "default" ? "" : v)}>
            <SelectTrigger size="sm" aria-label="排序" className="min-w-32">
              <span className="text-muted-foreground">排序</span>
              <SelectValue />
            </SelectTrigger>
            <SelectContent position="popper">
              {SORT_OPTIONS.map((o) => (
                <SelectItem key={o.value} value={o.value}>
                  {o.label}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
          <Button
            variant="ghost"
            size="icon"
            className="h-8 w-8"
            aria-label={desc ? "降序，点击改为升序" : "升序，点击改为降序"}
            title={desc ? "降序" : "升序"}
            onClick={() => setFilter("order", desc ? "asc" : "")}
          >
            {desc ? <ArrowDownWideNarrow className="h-4 w-4" /> : <ArrowUpNarrowWide className="h-4 w-4" />}
          </Button>
        </div>
        {onReset ? (
          <Button variant="ghost" size="sm" onClick={onReset}>
            清除筛选
          </Button>
        ) : null}
      </div>
    </div>
  );
}

function ReleaseRow({ r, onDownload }: { r: SearchRelease; onDownload: () => void }) {
  const promo = promoLabel(r.promotion.type);
  const inv = r.inventory ? INVENTORY_STATE[r.inventory.state] : null;
  const p = r.parsed;
  const tech = [p.resolution, p.source, p.videoCodec, ...p.hdr, p.releaseGroup].filter(Boolean).join(" · ");
  return (
    <li className="px-4 py-3">
      <div className="flex min-w-0 flex-wrap items-start gap-x-2 gap-y-1">
        <span className="min-w-0 flex-1 text-sm font-medium break-all text-foreground">{r.title}</span>
        <span className="flex flex-wrap gap-1">
          {promo ? <StatusBadge tone={r.free ? "success" : "neutral"}>{promo}</StatusBadge> : null}
          {r.hr === true ? <StatusBadge tone="warning">H&R</StatusBadge> : null}
          {r.hr === "unknown" ? <StatusBadge>H&R 未知</StatusBadge> : null}
        </span>
      </div>
      {r.subtitle ? <p className="mt-0.5 line-clamp-1 text-caption text-muted-foreground">{r.subtitle}</p> : null}
      <div className="mt-1.5 flex flex-wrap items-center gap-x-3 gap-y-1 text-meta text-muted-foreground tabular-nums">
        <span className="font-medium text-foreground">{r.siteName}</span>
        {r.category.name ? <span>{r.category.name}</span> : null}
        <span>{r.sizeBytes === null ? "大小未知" : formatBytes(r.sizeBytes, 1)}</span>
        <span className="inline-flex items-center gap-0.5" title="做种 / 下载">
          <ArrowUp className="h-3 w-3" />
          {r.seeders ?? "?"}
          <ArrowDown className="ml-1 h-3 w-3" />
          {r.leechers ?? "?"}
        </span>
        <span title="站点发布时间">发布 {relTime(r.uploadedAt)}</span>
        {tech ? <span className="break-all">{tech}</span> : null}
      </div>
      <div className="mt-2 flex flex-wrap items-center justify-between gap-2">
        <span className="flex min-w-0 flex-wrap items-center gap-1.5 text-meta">
          {r.entity ? (
            <>
              <Link
                to={`/console/library/${r.entity.id}`}
                className="truncate text-foreground underline-offset-4 hover:underline"
              >
                {r.entity.title}
                {r.entity.year ? ` (${r.entity.year})` : ""}
              </Link>
              {r.entityMatch === "alias" ? <StatusBadge>未确认</StatusBadge> : null}
              {inv ? <StatusBadge tone={inv.tone}>{inv.label}</StatusBadge> : null}
            </>
          ) : (
            <span className="text-muted-foreground">未关联本地作品</span>
          )}
        </span>
        <span className="flex flex-wrap items-center gap-1">
          {r.sourceReleaseId ? (
            <Button asChild variant="ghost" size="sm">
              <Link to={`/console/sites/${r.siteId}`} title="在站点工作台查看">
                <ExternalLink />
                工作台
              </Link>
            </Button>
          ) : null}
          <Button variant="ghost" size="sm" onClick={() => delegateToAgent(r)}>
            <Bot />
            委托 Agent
          </Button>
          <Button size="sm" onClick={onDownload}>
            <Download />
            下载
          </Button>
        </span>
      </div>
    </li>
  );
}