"use client";

import { useState, useCallback, useEffect, useRef } from "react";
import Link from "next/link";
import JoinModal from "./JoinModal";
import {
  getPayEnv,
  redirectToPay,
  getDeviceFromEnv,
} from "@/app/lib/payment";
import type { PayChannel } from "@/app/lib/payment";

const avatarPhotos = [
  "https://i.pravatar.cc/150?img=32",
  "https://i.pravatar.cc/150?img=33",
  "https://i.pravatar.cc/150?img=25",
  "https://i.pravatar.cc/150?img=52",
  "https://i.pravatar.cc/150?img=44",
];

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 [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 () => {
      try {
        const res = await fetch("/api/auth/me", { credentials: "include" });
        const data = await res.json();
        setIsLoggedIn(!!data?.user);
      } catch {
        setIsLoggedIn(false);
      }
    };
    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("请输入邮箱");
        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 checkRes = await fetch("/api/salon/check-user", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ email: trimmed }),
          credentials: "include",
        });
        const checkData = await checkRes.json();
        if (!checkRes.ok || !checkData?.ok) {
          throw new Error(checkData?.error || checkData?.detail || "操作失败");
        }
        if (checkData.exists) {
          checkUserCacheRef.current = { email: trimmed, data: { exists: true, vip: !!checkData.vip }, ts: Date.now() };
          setJoinModalVipOnly(!!checkData.vip);
          setJoinModalOpen(true);
          return;
        }
        const shouldPrecreateUser =
          typeof window !== "undefined" &&
          isPrivateDevHost(window.location.hostname);
        let user_id = buildPendingUserId(trimmed);
        if (shouldPrecreateUser) {
          const ensureRes = await fetch("/api/salon/ensure-user", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ email: trimmed }),
            credentials: "include",
          });
          const ensureData = await ensureRes.json();
          if (!ensureRes.ok || !ensureData?.ok || !ensureData?.user_id) {
            throw new Error(ensureData?.error || ensureData?.detail || "创建用户失败");
          }
          if (ensureData.is_new) {
            await fetch("/api/salon/set-needs-password-change", { method: "POST", credentials: "include" });
          }
          user_id = String(ensureData.user_id).trim();
          if (ensureData?.token && ensureData?.record) {
            await fetch("/api/auth/sync-session", {
              method: "POST",
              headers: { "Content-Type": "application/json" },
              body: JSON.stringify({ token: ensureData.token, record: ensureData.record }),
              credentials: "include",
            });
          }
        }
        const returnUrl =
          typeof window !== "undefined" ? `${window.location.origin}/join/paid` : "/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]
  );

  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="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">
          <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">
              🏆 数字游民首选
            </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">探索中国</span>
              <br />
              <span className="text-gray-900 dark:text-gray-100">远程工作，自由生活</span>
            </h1>

            <p className="text-base sm:text-lg text-gray-500 dark:text-gray-400 max-w-2xl mb-7 leading-relaxed">
              加入全球数字游民社区，发现中国最适合远程工作和生活的城市
            </p>

            <div className="space-y-2.5 mb-8">
              {[
                { icon: "🍹", text: "线下聚会与线上分享" },
                { icon: "❤️", text: "结识志同道合的伙伴" },
                { icon: "🧪", text: "探索新城市与新可能" },
                { icon: "🌎", text: "全球数字游民网络" },
                { icon: "💬", text: "社区互助与资源共享" },
              ].map((f) => (
                <div key={f.icon} 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">
                    {f.text}
                  </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={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">
                已有 5,000+ 成员加入
              </span>
            </div>
          </div>

          <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 overflow-hidden">
                <button className="relative w-16 h-16 rounded-full bg-white/95 flex items-center justify-center shadow-lg 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="输入邮箱，加入社区"
                    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 ? "处理中…" : "加入社区 →"}
                  </button>
                </form>
              ) : (
                <div className="p-4 sm:p-5 text-center">
                  <p className="text-sm text-gray-600 dark:text-gray-400">
                    您已登录，可前往社区参与互动
                  </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="/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">
                💬 加入社区
              </Link>
            </div>
          </div>
        </div>
      </div>
    </section>
  );
}
