"use client";

import { useState, useCallback, useEffect, useRef } from "react";
import { Link, useLocale } from "@/i18n/navigation";
import { useTranslation } from "@/i18n/navigation";
import JoinModal from "./JoinModal";
import {
  getPayEnv,
  redirectToPay,
  getDeviceFromEnv,
} from "@/app/lib/payment";
import type { PayChannel } from "@/app/lib/payment";
import { apiFetch, fetchAuthMe, syncAuthSession } from "@/app/lib/api-client";
import { mediaUrl } from "@/app/lib/media";
import { avatarForIndex } from "@/app/data/avatars";
import { useDevDebug } from "@/app/context/DevDebugContext";

const MEDIA_NAMES_ZH = ["36氪", "少数派", "极客公园", "虎嗅", "创业邦", "澎湃新闻"];
const MEDIA_NAMES_EN = ["36Kr", "sspai", "GeekPark", "Huxiu", "Cyzone", "The Paper"];

const avatarPhotos = [
  avatarForIndex(0),
  avatarForIndex(1),
  avatarForIndex(2),
  avatarForIndex(3),
  avatarForIndex(4),
  avatarForIndex(5),
  avatarForIndex(6),
  avatarForIndex(7),
  avatarForIndex(8),
  avatarForIndex(9),
  avatarForIndex(10),
];

const features = [
  { icon: "🍹", key: "feature1" as const },
  { icon: "❤️", key: "feature2" as const },
  { icon: "🧪", key: "feature3" as const },
  { icon: "🌎", key: "feature4" as const },
  { icon: "💬", key: "feature5" as const },
];

function isPrivateDevHost(hostname: string): boolean {
  if (!hostname) return false;
  if (hostname === "localhost" || hostname === "127.0.0.1" || hostname === "::1") {
    return true;
  }
  if (/^10\./.test(hostname) || /^192\.168\./.test(hostname)) {
    return true;
  }
  const match = hostname.match(/^172\.(\d{1,2})\./);
  if (!match) return false;
  const secondOctet = Number(match[1]);
  return secondOctet >= 16 && secondOctet <= 31;
}

function buildPendingUserId(email: string): string {
  return (
    "pending_" +
    Array.from(new TextEncoder().encode(email))
      .map((b) => b.toString(16).padStart(2, "0"))
      .join("")
  );
}

export default function HeroSection() {
  const { t: tHero } = useTranslation("hero");
  const locale = useLocale();
  const { isFeatureVisible } = useDevDebug();
  const showMediaPress = isFeatureVisible("home.mediaPress");
  const [email, setEmail] = useState("");
  const [joinModalOpen, setJoinModalOpen] = useState(false);
  const [joinModalVipOnly, setJoinModalVipOnly] = useState(false);
  const [checking, setChecking] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [isLoggedIn, setIsLoggedIn] = useState(false);

  useEffect(() => {
    const checkAuth = async () => {
      const data = await fetchAuthMe();
      setIsLoggedIn(!!data?.user);
    };
    checkAuth();
    const onAuth = () => checkAuth();
    window.addEventListener("auth:updated", onAuth);
    return () => window.removeEventListener("auth:updated", onAuth);
  }, []);

  const checkUserCacheRef = useRef<{ email: string; data: { exists: boolean; vip: boolean }; ts: number } | null>(null);
  const CACHE_TTL_MS = 60_000;

  const handleCheckAndProceed = useCallback(
    async (em: string) => {
      if (checking) return;
      const trimmed = em.trim();
      if (!trimmed) {
        setError(locale === "zh" ? "请输入邮箱" : "Please enter your email");
        return;
      }
      setError(null);
      setChecking(true);
      try {
        const cached = checkUserCacheRef.current;
        if (cached && cached.email === trimmed && Date.now() - cached.ts < CACHE_TTL_MS) {
          const { exists, vip } = cached.data;
          if (exists) {
            setJoinModalVipOnly(!!vip);
            setJoinModalOpen(true);
            return;
          }
        }
        const checkData = await apiFetch<{ ok?: boolean; exists?: boolean; vip?: boolean; error?: string }>(
          "/api/meetup/check-user",
          { method: "POST", body: JSON.stringify({ email: trimmed }) }
        );
        if (!checkData?.ok) {
          throw new Error(checkData?.error || (locale === "zh" ? "操作失败" : "Operation failed"));
        }
        if (checkData.exists) {
          checkUserCacheRef.current = { email: trimmed, data: { exists: true, vip: !!checkData.vip }, ts: Date.now() };
          if (checkData.vip) {
            setJoinModalOpen(true);
            setJoinModalVipOnly(true);
            return;
          }
          setJoinModalVipOnly(false);
          setJoinModalOpen(true);
          return;
        }
        // 新用户：支付成功后才创建，用 pending_hex(email) 作为 user_id
        const shouldPrecreateUser =
          typeof window !== "undefined" &&
          isPrivateDevHost(window.location.hostname);
        let user_id = buildPendingUserId(trimmed);
        if (shouldPrecreateUser) {
          const ensureData = await apiFetch<{
            ok?: boolean;
            user_id?: string;
            token?: string;
            record?: Record<string, unknown>;
            error?: string;
          }>("/api/meetup/ensure-user", {
            method: "POST",
            body: JSON.stringify({ email: trimmed }),
          });
          if (!ensureData?.ok || !ensureData?.user_id) {
            throw new Error(
              ensureData?.error || (locale === "zh" ? "创建用户失败" : "Failed to create user")
            );
          }
          user_id = String(ensureData.user_id).trim();
          if (ensureData?.token && ensureData?.record) {
            await syncAuthSession(ensureData.token, ensureData.record);
          }
        }
        const returnUrl =
          typeof window !== "undefined" ? `${window.location.origin}/${locale}/join/paid` : "/zh/join/paid";
        const env = getPayEnv();
        const channel: PayChannel = "wxpay";
        redirectToPay({
          user_id,
          return_url: returnUrl,
          channel,
          device: getDeviceFromEnv(env),
          useJoinConfig: true,
        });
      } catch (err) {
        setError(err instanceof Error ? err.message : "操作失败");
      } finally {
        setChecking(false);
      }
    },
    [checking, locale]
  );

  const handleJoinClick = (e: React.FormEvent) => {
    e.preventDefault();
    handleCheckAndProceed(email);
  };

  return (
    <section className="relative overflow-hidden">
      <div className="absolute inset-0 bg-gradient-to-b from-orange-50/70 via-white to-[#fafafa] dark:from-gray-950 dark:via-gray-900 dark:to-gray-950" />
      <div
        className="absolute top-0 right-0 w-[500px] h-[500px] -translate-y-1/3 translate-x-1/4 opacity-40 rounded-full"
        style={{
          background:
            "radial-gradient(circle, rgba(249,115,22,0.25) 0%, transparent 70%)",
        }}
      />
      <div
        className="absolute bottom-0 left-0 w-[350px] h-[350px] translate-y-1/3 -translate-x-1/4 opacity-30 rounded-full"
        style={{
          background:
            "radial-gradient(circle, rgba(139,92,246,0.2) 0%, transparent 70%)",
        }}
      />

      <div className="relative max-w-[1400px] mx-auto px-5 sm:px-10 py-10 sm:py-14 md:py-20">
        <div className="flex flex-col lg:flex-row lg:items-start lg:gap-10 xl:gap-16">
          {/* Left Column */}
          <div className="flex-1 min-w-0">
            <span className="inline-flex items-center gap-1.5 text-xs font-semibold text-orange-700 dark:text-orange-400 bg-orange-100 dark:bg-orange-900/30 px-3 py-1.5 rounded-full mb-5">
              🏆 {tHero("badge")}
            </span>

            <h1 className="text-3xl sm:text-4xl md:text-5xl lg:text-6xl font-bold tracking-tight leading-tight mb-5">
              <span className="hero-gradient-text">{tHero("title")}</span>
              <br />
              <span className="text-gray-900 dark:text-gray-100">{tHero("titleSuffix")}</span>
            </h1>

            <p className="text-base sm:text-lg text-gray-500 dark:text-gray-400 max-w-2xl mb-7 leading-relaxed">
              {tHero("subtitle")}
            </p>

            <div className="space-y-2.5 mb-8">
              {features.map((f) => (
                <div key={f.key} className="flex items-start gap-2.5">
                  <span className="text-base sm:text-lg shrink-0 mt-0.5">
                    {f.icon}
                  </span>
                  <span className="text-sm sm:text-base text-gray-600 dark:text-gray-400 underline decoration-gray-300 dark:decoration-gray-600 underline-offset-2">
                    {tHero(f.key)}
                  </span>
                </div>
              ))}
            </div>

            <div className="flex items-center gap-3 mb-8">
              <div className="flex -space-x-2">
                {avatarPhotos.slice(0, 8).map((src, i) => (
                  <img
                    key={i}
                    src={mediaUrl(src)}
                    alt=""
                    className="w-8 h-8 sm:w-9 sm:h-9 rounded-full border-2 border-white dark:border-gray-800 shadow-sm object-cover"
                  />
                ))}
              </div>
              <span className="text-sm text-gray-500 dark:text-gray-400">
                {tHero("membersJoined")}
              </span>
            </div>

            {showMediaPress && (
              <div className="pt-7 border-t border-gray-100 dark:border-gray-800">
                <p className="text-xs text-gray-400 dark:text-gray-500 uppercase tracking-wider mb-3">
                  {tHero("mediaPress")}
                </p>
                <div className="flex flex-wrap items-center gap-x-6 sm:gap-x-8 gap-y-2">
                  {(locale === "zh" ? MEDIA_NAMES_ZH : MEDIA_NAMES_EN).map(
                    (name) => (
                      <span
                        key={name}
                        className="text-sm font-semibold text-gray-300 dark:text-gray-600 hover:text-gray-400 dark:hover:text-gray-500 transition-colors cursor-default"
                      >
                        {name}
                      </span>
                    )
                  )}
                </div>
              </div>
            )}
          </div>

          {/* Right Column: Video + Email */}
          <div className="lg:w-[360px] xl:w-[400px] shrink-0 mt-10 lg:mt-4">
            <div className="bg-white dark:bg-gray-900 rounded-2xl shadow-xl overflow-hidden border border-gray-100 dark:border-gray-800">
              <div className="relative h-48 sm:h-56 bg-gradient-to-br from-emerald-400 via-teal-500 to-cyan-600 flex items-center justify-center cursor-pointer group overflow-hidden">
                <div className="absolute inset-0 opacity-20">
                  <div className="absolute top-4 left-4 w-20 h-16 rounded-lg bg-white/20" />
                  <div className="absolute bottom-6 right-6 w-24 h-14 rounded-lg bg-white/15" />
                  <div className="absolute top-1/2 left-1/3 w-16 h-16 rounded-full bg-white/10" />
                </div>
                <div className="absolute bottom-0 left-0 right-0 h-1/3 bg-gradient-to-t from-black/20 to-transparent" />
                <button className="relative w-16 h-16 rounded-full bg-white/95 flex items-center justify-center shadow-lg group-hover:scale-110 transition-transform">
                  <svg
                    className="w-7 h-7 text-emerald-600 ml-1"
                    fill="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path d="M8 5v14l11-7z" />
                  </svg>
                </button>
              </div>

              {!isLoggedIn ? (
                <form onSubmit={handleJoinClick} className="p-4 sm:p-5">
                  <input
                    type="email"
                    value={email}
                    onChange={(e) => { setEmail(e.target.value); setError(null); }}
                    placeholder={tHero("emailPlaceholder")}
                    className="w-full border border-gray-200 dark:border-gray-700 rounded-lg px-4 py-3 text-sm placeholder-gray-400 dark:placeholder-gray-500 bg-white dark:bg-gray-800 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-[#ff4d4f]/20 focus:border-[#ff4d4f] transition-colors mb-3"
                  />
                  {error && (
                    <p className="mb-3 text-sm text-red-600 dark:text-red-400">{error}</p>
                  )}
                  <button
                    type="submit"
                    disabled={checking}
                    className="w-full bg-[#ff4d4f] hover:bg-[#ff3333] dark:hover:bg-[#ff5c5e] text-white py-3 rounded-lg text-sm font-semibold transition-colors active:scale-[0.98] disabled:opacity-70"
                  >
                    {checking ? (locale === "zh" ? "处理中…" : "Processing…") : tHero("ctaJoin")}
                  </button>
                </form>
              ) : (
                <div className="p-4 sm:p-5 text-center">
                  <p className="text-sm text-gray-600 dark:text-gray-400">
                    {locale === "zh" ? "您已登录，可前往社区参与互动" : "You are logged in"}
                  </p>
                </div>
              )}
            </div>
            <JoinModal
              isOpen={joinModalOpen}
              onClose={() => { setJoinModalOpen(false); setJoinModalVipOnly(false); }}
              initialEmail={email.trim()}
              vipOnly={joinModalVipOnly}
            />

            <div className="mt-4 flex flex-wrap gap-2 justify-center">
              <Link href="/dashboard" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                📍 {tHero("quickLinks.nextStop")}
              </Link>
              <Link href="/meetups" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                🍹 {tHero("quickLinks.meetups")}
              </Link>
              <Link href="/dating" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                ❤️ {tHero("quickLinks.dating")}
              </Link>
              <Link href="/tools" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                📊 {tHero("quickLinks.tools")}
              </Link>
              <Link href="/ai" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                🤖 {tHero("quickLinks.ai")}
              </Link>
              <Link href="/gigs" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                💰 {tHero("quickLinks.gigs")}
              </Link>
              <Link href="/report" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                📊 {tHero("quickLinks.report")}
              </Link>
              <Link href="/join" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 bg-white dark:bg-gray-800 rounded-full px-3 py-1.5 border border-gray-100 dark:border-gray-700 transition-colors min-h-[2rem] inline-flex items-center">
                💬 {tHero("quickLinks.join")}
              </Link>
            </div>
          </div>
        </div>
      </div>
    </section>
  );
}