import { ArrowLeft, Search } from "lucide-react";
import { type FormEvent, useEffect, useMemo, useState } from "react";
import { Link, useNavigate, useSearchParams } from "react-router";
import { EmptyState } from "~/components/console/empty-state.tsx";
import { PageHeader } from "~/components/console/page-header.tsx";
import { useQueryState } from "~/components/console/use-query-state.ts";
import {
  parseWorkRef,
  RELEASE_FILTER_KEYS,
  type ReleaseFilterState,
  ReleaseResults,
} from "~/components/search/release-results.tsx";
import { ActionsSection, WorksSection } from "~/components/search/search-sections.tsx";
import { SitePickerDialog } from "~/components/search/site-picker-dialog.tsx";
import { releaseSearchPath } from "~/components/search/work-card.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Input } from "~/components/ui/input.tsx";

// 全局搜索(SEARCH-2 两阶段):/console/search?q= 先列作品(本地 + TMDB,带库内状态)与操作,不查站点;
// 点「搜索资源」选站点后进第二阶段 ?q=&work=&in=&t=(work = local:<id> / tmdb:<type>:<id> / q:<关键词>,in = 站点 ID)。

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

export default function SearchPage() {
  const [params, setParams] = useSearchParams();
  const navigate = useNavigate();
  const q = (params.get("q") ?? "").trim();
  const work = params.get("work") ?? "";
  const title = params.get("t") ?? q;
  const siteIds = params.get("in") ?? "";
  const target = useMemo(() => (work ? parseWorkRef(work) : null), [work]);
  const [input, setInput] = useState(q);
  const [picking, setPicking] = useState(false);
  useEffect(() => setInput(q), [q]);
  const f = useQueryState(RELEASE_FILTER_KEYS);

  const submit = (e: FormEvent) => {
    e.preventDefault();
    const next = input.trim();
    if (!next || (next === q && !work)) return;
    // 换关键词回到第一阶段,筛选随之清空
    setParams(new URLSearchParams({ q: next }));
  };

  return (
    <>
      <PageHeader title="搜索" description="先看作品和库内状态，需要时再到站点搜资源。" />
      <form onSubmit={submit} className="mb-6 flex gap-2">
        <div className="relative min-w-0 flex-1 sm:max-w-xl">
          <Search className="pointer-events-none absolute top-1/2 left-3 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
          <Input
            value={input}
            onChange={(e) => setInput(e.target.value)}
            placeholder="作品名、原名或别名"
            aria-label="搜索关键词"
            className="pl-9"
          />
        </div>
        <Button type="submit" disabled={!input.trim()}>
          搜索
        </Button>
      </form>

      {!q ? (
        <EmptyState icon={Search} title="输入作品名开始搜索" description="也可以在任意页面按 Ctrl/⌘ K 打开搜索。" />
      ) : target ? (
        <div key={`${work}|${siteIds}`} className="space-y-4">
          <div className="flex flex-wrap items-center gap-x-3 gap-y-1">
            <Link
              to={`/console/search?${new URLSearchParams({ q }).toString()}`}
              className="inline-flex items-center gap-1 text-caption text-muted-foreground hover:text-foreground"
            >
              <ArrowLeft className="h-4 w-4" />
              返回作品
            </Link>
            <h2 className="min-w-0 text-body font-semibold break-words text-foreground">
              {target.q ? `关键词「${target.q}」` : `「${title}」`}的资源
            </h2>
          </div>
          <ReleaseResults
            target={target}
            siteIds={siteIds}
            filters={f.values as ReleaseFilterState}
            setFilter={f.set}
            resetFilters={f.reset}
            onChangeSites={() => setPicking(true)}
          />
          <SitePickerDialog
            open={picking}
            onOpenChange={setPicking}
            title={target.q ?? title}
            onConfirm={(ids) => navigate(releaseSearchPath({ title, ref: work }, ids))}
          />
        </div>
      ) : (
        <div key={q} className="space-y-8">
          <WorksSection q={q} />
          <ActionsSection q={q} />
        </div>
      )}
    </>
  );
}