"use client";

import { useState, useEffect, useRef } from "react";
import { Link, useTranslation } from "@/app/digital/i18n/navigation";
import { pbLogout } from "@/app/digital/lib/pocketbase";
import { useCrossSiteUrls } from "@/app/digital/lib/useCrossSiteUrls";
import DigitalThemeIcon, { type IconName } from "./DigitalThemeIcon";

function getAvatarLetter(email: string): string {
  const local = email.split("@")[0];
  if (!local) return "?";
  return local.slice(0, 1).toUpperCase();
}

interface UserAvatarProps {
  email: string;
  vip?: boolean;
  onLogout?: () => void;
  onRefreshVip?: () => void;
}

type MenuLink = {
  href: string;
  label: string;
  icon: IconName;
  emoji: string;
  external?: boolean;
};

/** 圆形头像 + 账户菜单，供 digital / meetup / vip 三站复用 */
export default function UserAvatar({ email, vip, onLogout }: UserAvatarProps) {
  const { t } = useTranslation("common");
  const { vipUrl } = useCrossSiteUrls();
  const [open, setOpen] = useState(false);
  const ref = useRef<HTMLDivElement>(null);

  const menuLinks: MenuLink[] = [
    { href: "/profile", label: t("profile"), icon: "user", emoji: "👤" },
    { href: "/course", label: t("course"), icon: "course", emoji: "🎓" },
    { href: "/ebook", label: t("ebook"), icon: "book", emoji: "📚" },
    { href: "/app", label: t("app"), icon: "phone", emoji: "📱" },
    { href: vipUrl, label: t("community"), icon: "globe", emoji: "🌐", external: true },
  ];

  useEffect(() => {
    const handleClickOutside = (e: MouseEvent) => {
      if (ref.current && !ref.current.contains(e.target as Node)) setOpen(false);
    };
    document.addEventListener("mousedown", handleClickOutside);
    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, []);

  const handleLogout = async () => {
    await pbLogout();
    setOpen(false);
    if (typeof window !== "undefined") {
      window.dispatchEvent(new CustomEvent("auth:updated"));
    }
    onLogout?.();
  };

  return (
    <div className="relative" ref={ref}>
      <button
        type="button"
        onClick={() => setOpen((o) => !o)}
        className="dn-avatar-button relative flex h-9 w-9 shrink-0 items-center justify-center rounded-full bg-sky-500 text-sm font-semibold text-white shadow-sm ring-2 ring-white transition hover:bg-sky-600 dark:ring-slate-900"
        aria-label={t("accountMenu")}
        aria-expanded={open}
      >
        {getAvatarLetter(email)}
        {vip && (
          <span
            className="absolute -right-0.5 -top-0.5 flex h-4 min-w-4 items-center justify-center rounded-full bg-amber-400 px-1 text-[9px] font-bold text-amber-900"
            title="VIP"
          >
            VIP
          </span>
        )}
      </button>
      {open && (
        <div className="dn-profile-menu absolute right-0 top-full z-50 mt-2 w-[280px] overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-xl dark:border-slate-700 dark:bg-slate-800">
          <div className="border-b border-slate-100 px-4 py-3 dark:border-slate-700">
            <div className="flex items-center gap-3">
              <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-full bg-sky-500 text-sm font-bold text-white">
                {getAvatarLetter(email)}
              </div>
              <div className="min-w-0">
                <p className="truncate text-sm font-semibold text-slate-900 dark:text-white">{email}</p>
                <p className="mt-0.5 text-xs font-medium text-slate-500 dark:text-slate-400">
                  {vip ? t("vipMember") : t("standardMember")}
                </p>
              </div>
            </div>
          </div>
          <div className="px-2 py-2">
            {menuLinks.map((item) =>
              item.external ? (
                <a
                  key={item.href}
                  href={item.href}
                  target="_blank"
                  rel="noopener noreferrer"
                  onClick={() => setOpen(false)}
                  className="dn-profile-menu-item flex w-full items-center gap-3 rounded-lg px-3 py-2.5 text-left text-sm font-medium text-slate-700 transition hover:bg-slate-50 dark:text-slate-300 dark:hover:bg-slate-700"
                >
                  <DigitalThemeIcon name={item.icon} emoji={item.emoji} className="h-4 w-4 shrink-0 text-base" />
                  <span>{item.label}</span>
                </a>
              ) : (
                <Link
                  key={item.href}
                  href={item.href}
                  onClick={() => setOpen(false)}
                  className="dn-profile-menu-item flex w-full items-center gap-3 rounded-lg px-3 py-2.5 text-left text-sm font-medium text-slate-700 transition hover:bg-slate-50 dark:text-slate-300 dark:hover:bg-slate-700"
                >
                  <DigitalThemeIcon name={item.icon} emoji={item.emoji} className="h-4 w-4 shrink-0 text-base" />
                  <span>{item.label}</span>
                </Link>
              )
            )}
          </div>
          <button
            onClick={handleLogout}
            className="dn-profile-menu-item flex w-full items-center gap-3 border-t border-slate-100 px-5 py-3 text-left text-sm font-semibold text-red-600 transition hover:bg-red-50 dark:border-slate-700 dark:text-red-300 dark:hover:bg-red-950/30"
          >
            <DigitalThemeIcon name="home" emoji="↩" className="h-4 w-4 shrink-0 text-base" />
            {t("logout")}
          </button>
        </div>
      )}
    </div>
  );
}