"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { useEffect, useState, type ReactNode } from "react";

import { openAppDownload, useAppDownloadHref } from "@/components/download/download-dialog";
import { footerNavItems } from "@/components/layout/footer-nav-items";
import { lockBodyScroll } from "@/lib/browser/scroll-lock";
import type { AppTranslationInfo, ConfigInfo, TranslationCategory, TranslationInfo } from "@/lib/api/types";
import { OFFICIAL_TG_HANDLE, OFFICIAL_TG_URL } from "@/lib/seo/metadata";

import { resolveAboutPlatformHref, resolveNavHref } from "./nav-href";
import { categoryHref, isNavActive } from "./nav-utils";

function isDownloadAppNav(name?: string | null) {
  return (name || "").trim() === "下载APP";
}

function withDividers(items: ReactNode[], divider: string) {
  return items.flatMap((item, index) =>
    index === 0 ? [item] : [<span key={`divider-${index}`} className={`shrink-0 ${divider}`} />, item],
  );
}

/** 联系方式只保留官方 TG */
const contacts = [
  {
    key: "tg",
    node: (
      <a href={OFFICIAL_TG_URL} target="_blank" rel="noopener noreferrer" className="text-xs leading-[18px] text-[#615970]">
        官方TG：{OFFICIAL_TG_HANDLE}
      </a>
    ),
  },
];
const socials = [{ label: "Telegram", icon: "/images/footer_tg.svg", href: OFFICIAL_TG_URL }];

function InfoNavLink({ item, onClose }: { item: TranslationInfo; onClose: () => void }) {
  const href = resolveAboutPlatformHref(item);
  const external = /^https?:\/\//i.test(href);
  const className = "text-xs leading-[18px] text-[#948AA3]/90";
  if (external) {
    return (
      <a href={href} target="_blank" rel="noopener noreferrer" onClick={onClose} className={className}>
        {item.name}
      </a>
    );
  }
  return (
    <Link href={href} onClick={onClose} className={className}>
      {item.name}
    </Link>
  );
}

export function MobileMenu({
  open,
  onClose,
  categoryList,
  bottonTranslations,
}: {
  open: boolean;
  onClose: () => void;
  categoryList?: TranslationCategory[] | null;
  bottonTranslations?: AppTranslationInfo | null;
  config?: ConfigInfo | null;
}) {
  const pathname = usePathname();
  const categories = categoryList ?? [];
  const [expandedId, setExpandedId] = useState<number | null>(null);
  // 仅渲染接口 bottonTranslations，不补自定义项
  const bottomNavLinks = footerNavItems(bottonTranslations);
  const downloadHref = useAppDownloadHref();

  useEffect(() => {
    if (!open) return;
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Escape") onClose();
    };
    const unlockScroll = lockBodyScroll();
    window.addEventListener("keydown", onKeyDown);
    return () => {
      unlockScroll();
      window.removeEventListener("keydown", onKeyDown);
    };
  }, [open, onClose]);

  return (
    <div
      data-component="mobile-menu"
      className={`fixed inset-0 z-50 lg:hidden ${open ? "" : "pointer-events-none"}`}
      {...(open ? {} : { inert: true as const })}
    >
      <div
        className={`absolute inset-0 bg-black/60 transition-opacity duration-300 ${open ? "opacity-100" : "opacity-0"}`}
        onClick={onClose}
      />
      <div
        role="dialog"
        aria-modal="true"
        aria-label="菜单"
        className={`absolute inset-y-0 left-0 flex w-[281px] max-w-[85vw] flex-col items-center gap-6 overflow-y-auto [scrollbar-width:none] bg-[#0B0914] px-9 py-[60px] transition-transform duration-300 ${
          open ? "translate-x-0" : "-translate-x-full"
        }`}
      >
        <button type="button" aria-label="关闭菜单" onClick={onClose} className="absolute top-[26px] right-[13px] size-6 cursor-pointer">
          <svg viewBox="0 0 24 24" fill="none" className="size-full" aria-hidden="true">
            <path d="M6 6l12 12M18 6L6 18" stroke="white" strokeWidth="2" strokeLinecap="round" />
          </svg>
        </button>

        <Link href="/" onClick={onClose} aria-label="黄果黑料" className="shrink-0">
          <img src="/logo.svg" alt="黄果黑料" className="h-[62px] w-[137px]" />
        </Link>

        <nav className="flex w-full flex-col gap-[11px]" aria-label="主导航">
          {categories.map((category) => {
            const href = categoryHref(category);
            const active = isNavActive(pathname, href);
            const children = category.translationList?.filter((item) => item.name) ?? [];
            const hasChildren = children.length > 0;
            const expanded = expandedId === category.id;

            if (hasChildren) {
              return (
                <div key={category.id} className="flex flex-col gap-1.5">
                  <button
                    type="button"
                    aria-expanded={expanded}
                    onClick={() => setExpandedId(expanded ? null : category.id)}
                    className={`flex h-11 shrink-0 items-center justify-between rounded-[9px] bg-white/10 px-[18px] text-base leading-[22px] font-medium ${
                      active ? "text-[#F12B9E]" : "text-white/90"
                    }`}
                  >
                    <span>{category.name}</span>
                    <span className={`text-xs transition-transform ${expanded ? "rotate-180" : ""}`}>▾</span>
                  </button>
                  {expanded ? (
                    <div className="flex flex-col gap-1 pl-2">
                      {children.map((item) => {
                        const childHref = resolveNavHref(item.urlValue);
                        const childActive = isNavActive(pathname, childHref);
                        return (
                          <Link
                            key={item.id}
                            href={childHref}
                            onClick={onClose}
                            className={`flex h-9 items-center rounded-lg px-4 text-sm ${
                              childActive ? "text-[#F12B9E]" : "text-white/70"
                            }`}
                          >
                            {item.name}
                          </Link>
                        );
                      })}
                    </div>
                  ) : null}
                </div>
              );
            }

            if (isDownloadAppNav(category.name)) {
              const className =
                "flex h-11 w-full shrink-0 cursor-pointer items-center rounded-[9px] bg-white/10 px-[18px] text-left text-base leading-[22px] font-medium text-white/90";
              if (downloadHref) {
                return (
                  <a
                    key={category.id}
                    href={downloadHref}
                    target="_blank"
                    rel="noopener noreferrer"
                    onClick={onClose}
                    className={className}
                  >
                    {category.name}
                  </a>
                );
              }
              return (
                <button
                  key={category.id}
                  type="button"
                  onClick={() => {
                    onClose();
                    openAppDownload();
                  }}
                  className={className}
                >
                  {category.name}
                </button>
              );
            }

            return (
              <Link
                key={category.id}
                href={href}
                onClick={onClose}
                aria-current={active ? "page" : undefined}
                className={`flex h-11 shrink-0 items-center rounded-[9px] bg-white/10 px-[18px] text-base leading-[22px] font-medium ${
                  active ? "text-[#F12B9E]" : "text-white/90"
                }`}
              >
                {category.name}
              </Link>
            );
          })}
        </nav>

        {bottomNavLinks.length ? (
          <nav
            aria-label="底部导航"
            className="flex w-full flex-wrap items-center justify-center gap-1.5 py-0.5"
          >
            {withDividers(
              bottomNavLinks.map((link) => (
                <InfoNavLink key={link.id || link.name} item={link} onClose={onClose} />
              )),
              "h-5 w-px bg-white/20",
            )}
          </nav>
        ) : null}

        {contacts.length ? (
          <div className="flex w-full flex-wrap items-center justify-center gap-3">
            {withDividers(
              contacts.map((item) => <span key={item.key}>{item.node}</span>),
              "h-[18px] w-px bg-[#615970]",
            )}
          </div>
        ) : null}

        {socials.length ? (
          <div className="flex items-center gap-6">
            {withDividers(
              socials.map((social) => (
                <a
                  key={social.label}
                  href={social.href}
                  target={social.href.startsWith("http") ? "_blank" : undefined}
                  rel={social.href.startsWith("http") ? "noopener noreferrer" : undefined}
                  aria-label={social.label}
                  className="size-6"
                >
                  <img src={social.icon} alt="" className="size-full" />
                </a>
              )),
              "h-[15px] w-px bg-white/20",
            )}
          </div>
        ) : null}
      </div>
    </div>
  );
}