"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { useMemo, type ReactElement } from "react";
import { useTranslation } from "react-i18next";

import {
  Sidebar,
  SidebarContent,
  SidebarGroup,
  SidebarGroupContent,
  SidebarGroupLabel,
  SidebarHeader,
  SidebarMenu,
  SidebarMenuButton,
  SidebarMenuItem,
  SidebarRail,
  SidebarSeparator,
} from "@/components/ui/sidebar";
import { adminNavLabel } from "@/lib/admin-nav-label";
import { cn } from "@/lib/utils";
import { resolveAdminNavIcon } from "@/modules/_config/admin-nav-icons";
import { ADMIN_BASE } from "@/modules/_config/admin-nav";
import { useAdminProfile, useAdminSessionStore } from "@/stores/admin-session";

/** 与常见导航项文字宽度接近，避免整齐灰条 */
const SIDEBAR_NAV_SKELETON_WIDTHS = ["68%", "82%", "58%", "74%", "64%", "78%", "55%", "70%", "62%"] as const;

function SidebarNavSkeletonRow({
  labelWidth,
  delayMs,
}: {
  labelWidth: string;
  delayMs: number;
}): ReactElement {
  return (
    <SidebarMenuItem>
      <div
        aria-hidden
        className="flex h-8 w-full items-center gap-2 rounded-md px-2 group-data-[collapsible=icon]:justify-center group-data-[collapsible=icon]:px-1.5"
        style={{ animationDelay: `${delayMs}ms` }}
      >
        <span
          className="size-4 shrink-0 rounded-[4px] bg-white/12 motion-safe:animate-pulse"
          style={{ animationDelay: `${delayMs}ms` }}
        />
        <span
          className="h-2.5 shrink-0 rounded-full bg-white/12 motion-safe:animate-pulse group-data-[collapsible=icon]:hidden"
          style={{ width: labelWidth, animationDelay: `${delayMs + 40}ms` }}
        />
      </div>
    </SidebarMenuItem>
  );
}

function AdminSidebarSkeleton(): ReactElement {
  const { t } = useTranslation("common");

  return (
    <Sidebar collapsible="icon" className="overflow-hidden">
      <SidebarHeader className="flex h-14 shrink-0 items-center gap-0 border-b border-sidebar-border p-0 px-2">
        <SidebarMenu className="h-full w-full">
          <SidebarMenuItem className="h-full">
            <div className="flex h-12 w-full items-center px-1 group-data-[collapsible=icon]:justify-center">
              <img
                src="/logo.png"
                alt="N lotto"
                className="h-auto max-h-11 w-full object-contain object-left opacity-95 group-data-[collapsible=icon]:max-h-8 group-data-[collapsible=icon]:object-center"
              />
            </div>
          </SidebarMenuItem>
        </SidebarMenu>
      </SidebarHeader>
      <SidebarContent className="relative overflow-hidden">
        <div
          className="pointer-events-none absolute inset-x-0 bottom-0 h-[22rem] opacity-55 group-data-[collapsible=icon]:hidden"
          aria-hidden
        >
          <img
            src="/image6.png"
            alt=""
            className="h-full w-full object-cover object-bottom"
          />
          <div className="absolute inset-x-0 top-0 h-28 bg-linear-to-b from-sidebar to-transparent" />
          <div className="absolute inset-0 bg-sidebar/20" />
        </div>
        <SidebarGroup className="relative z-10">
          <SidebarGroupLabel className="text-sidebar-foreground/55">
            {t("sidebar.workspace", { defaultValue: "Workspace" })}
          </SidebarGroupLabel>
          <SidebarGroupContent>
            <SidebarMenu className={cn("gap-0.5", "motion-safe:opacity-90")}>
              {SIDEBAR_NAV_SKELETON_WIDTHS.map((width, i) => (
                <SidebarNavSkeletonRow key={i} labelWidth={width} delayMs={i * 55} />
              ))}
            </SidebarMenu>
          </SidebarGroupContent>
        </SidebarGroup>
      </SidebarContent>
      <SidebarSeparator />
      <SidebarRail />
      <span className="sr-only" role="status" aria-live="polite">
        {t("auth.checking")}
      </span>
    </Sidebar>
  );
}

function isActive(pathname: string, item: { href: string; activeMatchPrefix?: string; segment?: string }): boolean {
  const { href, activeMatchPrefix, segment } = item;
  const prefix = activeMatchPrefix ?? href;
  if (prefix === ADMIN_BASE || prefix === `${ADMIN_BASE}/`) {
    return pathname === ADMIN_BASE || pathname === `${ADMIN_BASE}/`;
  }
  // Keep "settings" independent from its child routes like /admin/settings/currencies.
  if (segment === "settings") {
    return pathname === href;
  }
  return pathname === prefix || pathname.startsWith(`${prefix}/`);
}

export function AdminAppSidebar() {
  const { t } = useTranslation(["common", "dashboard", "players", "draws", "config", "wallet", "risk", "settlement", "jackpot", "reconcile", "tickets", "audit", "reports"]);
  const pathname = usePathname();
  const shellAuthPending = useAdminSessionStore((s) => s.shellAuthPending);
  const profile = useAdminProfile();

  if (shellAuthPending) {
    return <AdminSidebarSkeleton />;
  }
  const visibleNav = useMemo(
    () => (profile?.navigation ?? []).filter((item) => item.segment !== "risk"),
    [profile?.navigation],
  );

  return (
    <Sidebar collapsible="icon" className="overflow-hidden">
      <SidebarHeader className="flex h-14 shrink-0 items-center gap-0 border-b border-sidebar-border p-0 px-2">
        <SidebarMenu className="h-full w-full">
          <SidebarMenuItem className="h-full">
            <SidebarMenuButton
              render={<Link href={ADMIN_BASE} />}
              className="h-full min-h-0 justify-start px-1 py-0 hover:bg-transparent group-data-[collapsible=icon]:justify-center"
            >
              <div className="flex h-12 w-full items-center group-data-[collapsible=icon]:size-10 group-data-[collapsible=icon]:justify-center">
                <img
                  src="/logo.png"
                  alt="N lotto"
                  className="h-auto max-h-11 w-full object-contain object-left group-data-[collapsible=icon]:max-h-8 group-data-[collapsible=icon]:object-center"
                />
              </div>
            </SidebarMenuButton>
          </SidebarMenuItem>
        </SidebarMenu>
      </SidebarHeader>
      <SidebarContent className="relative overflow-hidden">
        <div
          className="pointer-events-none absolute inset-x-0 bottom-0 h-[22rem] opacity-55 group-data-[collapsible=icon]:hidden"
          aria-hidden
        >
          <img
            src="/image6.png"
            alt=""
            className="h-full w-full object-cover object-bottom"
          />
          <div className="absolute inset-x-0 top-0 h-28 bg-linear-to-b from-sidebar to-transparent" />
          <div className="absolute inset-0 bg-sidebar/20" />
        </div>
        <SidebarGroup>
          <SidebarGroupLabel>{t("sidebar.workspace", { ns: "common", defaultValue: "Workspace" })}</SidebarGroupLabel>
          <SidebarGroupContent>
            <SidebarMenu>
              {visibleNav.map((item) => {
                const Icon = resolveAdminNavIcon(item.segment);
                return (
                  <SidebarMenuItem key={item.segment}>
                    <SidebarMenuButton
                      tooltip={adminNavLabel(item.segment, t, item.label)}
                      isActive={isActive(pathname, item)}
                      render={<Link href={item.href} />}
                      className="font-medium text-sidebar-foreground/90 hover:text-sidebar-accent-foreground data-active:bg-red-600 data-active:text-white data-active:shadow-sm"
                    >
                      <Icon data-icon="inline-start" aria-hidden />
                      <span>{adminNavLabel(item.segment, t, item.label)}</span>
                    </SidebarMenuButton>
                  </SidebarMenuItem>
                );
              })}
            </SidebarMenu>
          </SidebarGroupContent>
        </SidebarGroup>
      </SidebarContent>
      <SidebarSeparator />
      <SidebarRail />
    </Sidebar>
  );
}