import { settingsSectionForLegacyTab } from "@umt/contracts";
import { useEffect } from "react";
import { Link, redirect, useLocation, useNavigate } from "react-router";
import { PageHeader } from "~/components/console/page-header.tsx";
import { parseSettingsHash, SECTIONS, settingsHash } from "~/components/settings/sections.tsx";
import { anchorId } from "~/components/settings/settings-block.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { cn } from "~/lib/utils.ts";

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

/** 旧链接 `?tab=xxx` → `#分区[/节]`(console-ia.md §3.3) */
export function clientLoader({ request }: { request: Request }) {
  const url = new URL(request.url);
  const tab = url.searchParams.get("tab");
  if (!tab) return null;
  const hit = settingsSectionForLegacyTab(tab);
  url.searchParams.delete("tab");
  const rest = url.searchParams.toString();
  return redirect(`${url.pathname}${rest ? `?${rest}` : ""}${hit ? settingsHash(hit.section, hit.anchor) : ""}`);
}

export default function SettingsPage() {
  const location = useLocation();
  const navigate = useNavigate();
  const { section, anchor } = parseSettingsHash(location.hash);

  // 切分区回到顶部;带节锚点时滚到该节(内容可能还在加载,稍后再试一次)
  useEffect(() => {
    if (!anchor) {
      window.scrollTo({ top: 0 });
      return;
    }
    let tries = 0;
    const go = () => {
      const el = document.getElementById(anchorId(section.id, anchor));
      if (el) el.scrollIntoView({ behavior: "smooth", block: "start" });
      else if (tries++ < 10) timer = window.setTimeout(go, 150);
    };
    let timer = window.setTimeout(go, 0);
    return () => window.clearTimeout(timer);
  }, [section.id, anchor]);

  return (
    <>
      <PageHeader title="设置" description="全局参数、实例与凭证。凭证保存后不回显。" />
      <div className="grid gap-6 lg:grid-cols-[13.5rem_minmax(0,1fr)] lg:gap-8">
        {/* 窄屏:顶部下拉 */}
        <div className="lg:hidden">
          <Select value={section.id} onValueChange={(id) => navigate({ hash: settingsHash(id) })}>
            <SelectTrigger className="w-full" aria-label="设置分区">
              <SelectValue />
            </SelectTrigger>
            <SelectContent position="popper">
              {SECTIONS.map((s) => (
                <SelectItem key={s.id} value={s.id}>
                  <s.icon />
                  {s.label}
                </SelectItem>
              ))}
            </SelectContent>
          </Select>
          <p className="mt-2 text-caption text-muted-foreground">{section.description}</p>
        </div>

        {/* 宽屏:左侧分区导航 */}
        <nav aria-label="设置分区" className="hidden lg:block">
          <ul className="sticky top-20 grid gap-0.5">
            {SECTIONS.map((s) => {
              const active = s.id === section.id;
              return (
                <li key={s.id}>
                  <Link
                    to={{ hash: settingsHash(s.id) }}
                    aria-current={active ? "page" : undefined}
                    className={cn(
                      "flex items-center gap-2.5 rounded-lg px-3 py-2 text-sm transition-colors duration-micro",
                      active
                        ? "bg-foreground/[0.07] font-medium text-foreground"
                        : "text-muted-foreground hover:bg-foreground/[0.04] hover:text-foreground",
                    )}
                  >
                    <s.icon className="size-4 shrink-0" aria-hidden />
                    {s.label}
                  </Link>
                  {active && s.anchors.length > 1 ? (
                    <ul className="mt-0.5 mb-1.5 ml-[1.375rem] grid gap-0.5 border-l border-border/60 pl-3">
                      {s.anchors.map((a) => (
                        <li key={a.id}>
                          <Link
                            to={{ hash: settingsHash(s.id, a.id) }}
                            className={cn(
                              "block rounded-md px-2 py-1 text-caption transition-colors duration-micro hover:text-foreground",
                              anchor === a.id ? "text-foreground" : "text-muted-foreground",
                            )}
                          >
                            {a.label}
                          </Link>
                        </li>
                      ))}
                    </ul>
                  ) : null}
                </li>
              );
            })}
          </ul>
        </nav>

        <div className="min-w-0">
          <div className="mb-6 hidden lg:block">
            <h2 className="flex items-center gap-2 text-title font-semibold text-foreground">{section.label}</h2>
            <p className="mt-0.5 text-caption text-muted-foreground">{section.description}</p>
          </div>
          <div key={section.id}>{section.render()}</div>
        </div>
      </div>
    </>
  );
}