"use client";

import { useEffect, useSyncExternalStore } from "react";
import { useChromeless } from "@/components/layout/route-visibility";

/** 对齐 jha-1043 eightPop.js：sessionStorage + 关闭/退出均离开站点 */
const SESSION_KEY = "ageConfirmed";
const EXIT_URL = "about:blank";

let confirmed: boolean | null = null;
const listeners = new Set<() => void>();

function emit() {
  listeners.forEach((listener) => listener());
}

function readConfirmed() {
  if (confirmed === null) {
    try {
      confirmed = window.sessionStorage.getItem(SESSION_KEY) === "1";
    } catch {
      confirmed = false;
    }
  }
  return confirmed;
}

function confirmAge() {
  confirmed = true;
  try {
    window.sessionStorage.setItem(SESSION_KEY, "1");
  } catch {
    // sessionStorage 不可用时仍允许本页确认并关闭
  }
  emit();
}

export function openAgeGateDialog() {
  confirmed = false;
  try {
    window.sessionStorage.removeItem(SESSION_KEY);
  } catch {}
  emit();
}

export function subscribeAgeGate(listener: () => void) {
  listeners.add(listener);
  return () => listeners.delete(listener);
}

export const getAgeGateOpen = () => !readConfirmed();
const getServerSnapshot = () => false;

function exitSite() {
  try {
    window.location.replace(EXIT_URL);
  } catch {
    window.location.href = EXIT_URL;
  }
}

export function AgeGateDialogHost() {
  const chromeless = useChromeless();
  const open = useSyncExternalStore(subscribeAgeGate, getAgeGateOpen, getServerSnapshot) && !chromeless;

  useEffect(() => {
    if (!open) return;
    const { overflow } = document.body.style;
    document.body.style.overflow = "hidden";
    return () => {
      document.body.style.overflow = overflow;
    };
  }, [open]);

  if (!open) return null;

  return (
    <div data-component="age-gate-dialog" className="fixed inset-0 z-[60] flex flex-col items-center overflow-y-auto bg-black/70 px-4 py-10">
      <div className="my-auto flex flex-col items-center gap-9 lg:gap-6">
        <section
          role="dialog"
          aria-modal="true"
          aria-labelledby="age-gate-title"
          aria-describedby="age-gate-desc"
          className="flex w-[300px] flex-col items-center gap-[18px] rounded-[20px] bg-[#0B0914] px-5 py-6 outline outline-1 outline-white/20 lg:w-[440px] lg:gap-9 lg:rounded-[40px] lg:p-9"
        >
          <AdultIcon />
          <div className="flex flex-col gap-[18px] text-white/90 lg:gap-6">
            <h2
              id="age-gate-title"
              className="text-center text-lg/6 font-semibold lg:text-2xl/8 lg:font-medium"
            >
              这是个成人网站
            </h2>
            <p id="age-gate-desc" className="text-justify text-sm/5 lg:text-lg/6">
              本网站包含有年龄限制的内容，包括裸体和露骨色情素材的内容。
              点击继续即表示您确认您已年满 18 岁，或在您访问本网站时所在的司法管辖区已是成年人
              <span className="hidden lg:inline">。</span>
            </p>
          </div>
          <div className="flex w-full flex-col gap-3">
            <button
              type="button"
              onClick={confirmAge}
              className="cursor-pointer rounded-xl bg-[#E9019C] py-[13px] text-base/[22px] font-semibold text-white transition hover:bg-[#F21AAA]"
            >
              我已年满18岁-进入
            </button>
            <button
              type="button"
              onClick={exitSite}
              className="cursor-pointer rounded-xl bg-white/10 py-[13px] text-base/[22px] text-white/90 transition hover:bg-white/15"
            >
              我未满18岁-退出
            </button>
          </div>
        </section>
        <button type="button" aria-label="退出" onClick={exitSite} className="cursor-pointer size-9">
          <svg viewBox="0 0 44 44" className="size-full" aria-hidden="true">
            <circle cx="22" cy="22" r="21" fill="none" stroke="white" strokeWidth="2" />
            <path d="M16 16l12 12M28 16L16 28" stroke="white" strokeWidth="2" strokeLinecap="round" />
          </svg>
        </button>
      </div>
    </div>
  );
}

function AdultIcon() {
  return (
    <svg viewBox="0 0 78 78" className="size-[78px] shrink-0 text-[#E9019C]" aria-hidden="true">
      <circle cx="39" cy="39" r="35" fill="none" stroke="currentColor" strokeWidth="5" />
      <text
        x="39"
        y="40"
        fill="currentColor"
        fontSize="26"
        fontWeight="800"
        textAnchor="middle"
        dominantBaseline="central"
        fontFamily="Arial, Helvetica, sans-serif"
      >
        18+
      </text>
    </svg>
  );
}