"use client";

import React, { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { signInWithGoogle, registerUser, sendVerificationLink } from "@/lib/auth";
import { GradientText } from "@/components/ui/gradient-text";
import { Eye, EyeOff, Mail } from "lucide-react";

export default function SignupPage() {
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [inviteCode, setInviteCode] = useState("");
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [formError, setFormError] = useState("");
  const [passwordError, setPasswordError] = useState("");
  const [confirmPasswordError, setConfirmPasswordError] = useState("");
  const [showPassword, setShowPassword] = useState(false);
  const [showConfirmPassword, setShowConfirmPassword] = useState(false);
  const [agreeToTerms, setAgreeToTerms] = useState(true);
  const [showActivationModal, setShowActivationModal] = useState(false);
  const [resendCooldown, setResendCooldown] = useState(60);
  const [resendLoading, setResendLoading] = useState(false);
  const [resendMessage, setResendMessage] = useState("");
  const [resendError, setResendError] = useState("");
  const router = useRouter();

  /** Password validation function with English prompts */
  const validatePassword = (password: string): string => {
    if (password.length < 8) {
      return "Password must be at least 8 characters";
    }
    if (password.length > 18) {
      return "Password cannot exceed 18 characters";
    }
    if (!/^(?=.*[a-zA-Z])(?=.*\d)[a-zA-Z\d!@#$%^*&]{8,18}$/.test(password)) {
      return "Password must contain both letters and numbers";
    }
    return "";
  };

  /** Get quick link to email provider by domain */
  const getEmailProviderLink = (addr: string): string | undefined => {
    const domain = addr.split("@")[1]?.toLowerCase();
    if (!domain) return undefined;
    const map: Record<string, string> = {
      "gmail.com": "https://mail.google.com",
      "outlook.com": "https://outlook.live.com/mail",
      "hotmail.com": "https://outlook.live.com/mail",
      "live.com": "https://outlook.live.com/mail",
      "yahoo.com": "https://mail.yahoo.com",
      "icloud.com": "https://www.icloud.com/mail",
      "qq.com": "https://mail.qq.com",
      "163.com": "https://mail.163.com",
      "126.com": "https://mail.126.com",
      "yeah.net": "https://mail.yeah.net",
    };
    return map[domain];
  };

  /** Handle resend activation email */
  const handleResend = async () => {
    if (resendCooldown > 0 || resendLoading) return;
    try {
      setResendLoading(true);
      setResendMessage("");
      setResendError("");
      await sendVerificationLink(email);
      setResendMessage("Resent. Please check your email.");
      setResendCooldown(60);
    } catch (err: any) {
      setResendError(err?.message || "Sending failed, please try again later");
    } finally {
      setResendLoading(false);
    }
  };

  /** Countdown for resend button */
  React.useEffect(() => {
    if (!showActivationModal) return;
    if (resendCooldown <= 0) return;
    const timer = setInterval(() => {
      setResendCooldown((s) => (s > 0 ? s - 1 : 0));
    }, 1000);
    return () => clearInterval(timer);
  }, [showActivationModal, resendCooldown]);

  /** Handle Terms of Service click */
  const handleTermsClick = () => {
    window.open("/Terms", "_blank");
  };

  /** Handle Privacy Policy click */
  const handlePrivacyClick = () => {
    window.open("/Privacy", "_blank");
  };

  /** 处理密码输入变化 */
  const handlePasswordChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const newPassword = e.target.value;
    setPassword(newPassword);

    if (newPassword) {
      const error = validatePassword(newPassword);
      setPasswordError(error);
    } else {
      setPasswordError("");
    }

    // 如果确认密码已输入，重新验证确认密码
    if (confirmPassword) {
      if (newPassword !== confirmPassword) {
        setConfirmPasswordError("Passwords do not match");
      } else {
        setConfirmPasswordError("");
      }
    }
  };

  /** 处理确认密码输入变化 */
  const handleConfirmPasswordChange = (
    e: React.ChangeEvent<HTMLInputElement>
  ) => {
    const newConfirmPassword = e.target.value;
    setConfirmPassword(newConfirmPassword);

    if (newConfirmPassword) {
      if (password !== newConfirmPassword) {
        setConfirmPasswordError("Passwords do not match");
      } else {
        setConfirmPasswordError("");
      }
    } else {
      setConfirmPasswordError("");
    }
  };

  const handleSubmit = async (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();

    // 验证密码
    const passwordValidationError = validatePassword(password);
    if (passwordValidationError) {
      setPasswordError(passwordValidationError);
      return;
    }

    // 验证确认密码
    if (password !== confirmPassword) {
      setConfirmPasswordError("Passwords do not match");
      return;
    }

    // 验证是否同意条款
    if (!agreeToTerms) {
      setFormError("Please agree to the Terms of Service and Privacy Policy");
      return;
    }

    setIsSubmitting(true);
    setFormError("");

    try {
      // Use new registration API
      await registerUser({
        userName: name,
        email,
        password,
        inviteCode: inviteCode || undefined,
      });

      // Show activation modal instead of redirecting to login
      setShowActivationModal(true);
      setResendCooldown(60);
    } catch (error: any) {
      console.error("Signup error:", error);
      setFormError(error.message||error.msg || "Registration failed, please try again");
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <>
    <div className="min-h-screen relative overflow-hidden">
      {/* 背景视频 */}
      <video
        autoPlay
        loop
        muted
        playsInline
        className="absolute inset-0 w-full h-full object-cover"
        data-alt="background-video"
      >
        <source src="/assets/login.mp4" type="video/mp4" />
      </video>

      {/* 视频遮罩层 */}
      <div
        className="absolute inset-0 bg-black/20"
        data-alt="video-overlay"
      ></div>

      {/* Logo */}
      <div
        className="absolute top-8 left-8 z-50"
        data-alt="logo-container"
        onClick={() => router.push("/")}
      >
        <span className="logo-heart cursor-pointer">
          <GradientText
            text="MovieFlow"
            startPercentage={30}
            endPercentage={70}
          />
        </span>
        {/* beta标签 */}
        <span className="inline-flex items-center px-1.5 py-0.5 text-[8px] font-semibold tracking-wider text-[rgb(212 202 202)] border border-[rgba(106,244,249,0.2)] rounded-full shadow-[0_0_10px_rgba(106,244,249,0.1)]">
          Beta
        </span>
      </div>

      {/* 注册框 - 居中显示 */}
      <div className="relative bottom-4 z-10 flex items-center justify-center min-h-screen p-4">
        <div className="max-w-md w-full bg-black/40 backdrop-blur-lg border border-white/20 rounded-2xl p-6 shadow-2xl">
          <div className="text-center mb-4">
            <h2 className="text-2xl font-bold text-white mb-2">
              Sign Up, for free
            </h2>
            <p className="text-gray-300">Create your account to get started</p>
          </div>

          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <label className="block text-sm font-medium text-white mb-1">
                Email
              </label>
              <input
                type="email"
                placeholder="your@email.com"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
                className="w-full px-4 py-3 rounded-lg bg-black/30 border border-white/20 text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
              />
            </div>
            <div>
              <label className="block text-sm font-medium text-white mb-1">
                Name
              </label>
              <input
                type="text"
                placeholder="Your name"
                value={name}
                onChange={(e) => setName(e.target.value)}
                required
                className="w-full px-4 py-3 rounded-lg bg-black/30 border border-white/20 text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
              />
            </div>

            <div>
              <label className="block text-sm font-medium text-white mb-1">
                Password
              </label>
              <div className="relative">
                <input
                  type={showPassword ? "text" : "password"}
                  placeholder="8-18 characters, letters, numbers and !@#$%^*&"
                  value={password}
                  onChange={handlePasswordChange}
                  required
                  className={`w-full px-4 py-3 pr-12 rounded-lg bg-black/30 border text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent ${
                    passwordError ? "border-red-500/50" : "border-white/20"
                  }`}
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className="absolute right-3 top-1/2 transform -translate-y-1/2 text-gray-400 hover:text-white transition-colors"
                  data-alt="toggle-password-visibility"
                >
                  {showPassword ? <EyeOff size={20} /> : <Eye size={20} />}
                </button>
              </div>

              <div>
                <label className="block text-sm font-medium text-white mb-1 mt-3">
                  Confirm Password
                </label>
                <div className="relative">
                  <input
                    type={showConfirmPassword ? "text" : "password"}
                    placeholder="Confirm your password"
                    value={confirmPassword}
                    onChange={handleConfirmPasswordChange}
                    required
                    className={`w-full px-4 py-3 pr-12 rounded-lg bg-black/30 border text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent ${
                      confirmPasswordError
                        ? "border-red-500/50"
                        : "border-white/20"
                    }`}
                  />
                  <button
                    type="button"
                    onClick={() => setShowConfirmPassword(!showConfirmPassword)}
                    className="absolute right-3 top-1/2 transform -translate-y-1/2 text-gray-400 hover:text-white transition-colors"
                    data-alt="toggle-confirm-password-visibility"
                  >
                    {showConfirmPassword ? (
                      <EyeOff size={20} />
                    ) : (
                      <Eye size={20} />
                    )}
                  </button>
                </div>
              </div>

              {passwordError && (
                <p className="mt-1 text-sm text-red-400">{passwordError}</p>
              )}
              {confirmPasswordError && (
                <p className="mt-1 text-sm text-red-400">
                  {confirmPasswordError}
                </p>
              )}
              {password && !passwordError && (
                <p className="mt-1 text-sm text-green-400">
                  ✓ Password format is correct
                </p>
              )}
              {confirmPassword && !confirmPasswordError && (
                <p className="mt-1 text-sm text-green-400">✓ Passwords match</p>
              )}
            </div>

            <div>
              <label className="block text-sm font-medium text-white mb-1">
                Invite Code
              </label>
              <input
                type="text"
                placeholder="Enter invite code if you have one"
                value={inviteCode}
                onChange={(e) => setInviteCode(e.target.value)}
                className="w-full px-4 py-3 rounded-lg bg-black/30 border border-white/20 text-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-purple-500 focus:border-transparent"
              />
            </div>

            <div className="flex items-start space-x-3">
              <label
                htmlFor="agreeToTerms"
                className="text-sm text-gray-300 leading-relaxed"
                data-alt="terms-privacy-info"
              >
                By clicking “Sign Up”, you agree to our{' '}
                <button
                  type="button"
                  onClick={handleTermsClick}
                  className="text-purple-400 hover:text-purple-300 underline"
                  data-alt="terms-link"
                >
                  Terms of Service
                </button>{' '}
                and acknowledge that you have read and understand our{' '}
                <button
                  type="button"
                  onClick={handlePrivacyClick}
                  className="text-purple-400 hover:text-purple-300 underline"
                  data-alt="privacy-link"
                >
                  Privacy Policy
                </button>
              </label>
            </div>

            {formError && (
              <div className="bg-red-500/20 text-red-300 p-3 rounded-lg border border-red-500/20">
                {formError}
              </div>
            )}

            <div className="flex gap-4 mt-6">
              <Link
                href="/login"
                className="flex-1 py-3 text-center border border-white/20 rounded-lg text-white hover:bg-white/10 transition-colors"
              >
                Back to login
              </Link>
              <button
                type="submit"
                disabled={
                  isSubmitting ||
                  !!passwordError ||
                  !!confirmPasswordError ||
                  !password ||
                  !confirmPassword
                }
                className="flex-1 py-3 rounded-lg cursor-pointer bg-[#C039F6] hover:bg-[#C039F6]/80 text-white font-medium transition-colors disabled:opacity-70 disabled:cursor-not-allowed"
              >
                {isSubmitting ? "Signing up..." : "Sign Up"}
              </button>
            </div>
          </form>

          {/* <div className="my-6 relative flex items-center">
            <div className="flex-grow border-t border-gray-500/30"></div>
            <span className="flex-shrink mx-4 text-gray-400">or</span>
            <div className="flex-grow border-t border-gray-500/30"></div>
          </div>

          <button
            onClick={handleGoogleSignIn}
            className="w-full flex items-center justify-center gap-3 py-3 border border-white/20 rounded-lg text-white hover:bg-white/5 transition-colors bg-black/30"
          >
            <img src="https://www.gstatic.com/firebasejs/ui/2.0.0/images/auth/google.svg" className="w-5 h-5" alt="Google" />
            Continue with Google
          </button> */}

          <div className="text-center mt-4">
            <p style={{ color: "rgba(255, 255, 255, 0.6)" }}>
              Already have an account?{" "}

            </p>
          </div>
        </div>
      </div>
    </div>
    {showActivationModal && (
      <div
        className="fixed inset-0 z-50 flex items-center justify-center bg-black/50 backdrop-blur-sm"
        data-alt="activation-modal-overlay"
      >
        <div
          className="w-full max-w-xl mx-4 relative rounded-2xl border border-white/15 bg-white/5 backdrop-blur-xl shadow-2xl"
          data-alt="activation-modal"
        >
          <div className="absolute -inset-px rounded-2xl bg-gradient-to-br from-cyan-400/10 to-purple-600/10 pointer-events-none"></div>
          <div className="relative p-6">
            <div className="flex items-center justify-center mb-4">
              <div className="relative">
                <div className="absolute inset-0 rounded-full bg-gradient-to-r from-cyan-400 to-purple-600 blur-xl opacity-30"></div>
                <Mail className="relative z-10 w-10 h-10 text-cyan-300" />
              </div>
            </div>
            <h3 className="text-xl font-semibold text-white text-center mb-2" data-alt="activation-title">Please verify your email to activate your account</h3>
            <p className="text-gray-300 text-center mb-4" data-alt="activation-desc">
              We have sent an activation email to {email || "your email"}; if you don't receive it, please check your spam folder or try again later
            </p>

            <div className="flex items-center justify-center mb-4 gap-3">
              {(() => {
                const provider = getEmailProviderLink(email);
                if (!provider) return null;
                const domain = email.split("@")[1] || "email";
                return (
                  <a
                    href={provider}
                    target="_blank"
                    rel="noreferrer"
                    className="inline-flex items-center gap-2 px-3 py-2 rounded-lg border border-white/15 text-gray-100 hover:bg-white/10 transition-colors"
                    data-alt="email-provider-link"
                  >
                    <Mail className="w-4 h-4" />
                    <span>Open {domain}</span>
                  </a>
                );
              })()}
            </div>

            {(resendMessage || resendError) && (
              <div className={`text-sm text-center mb-3 ${resendError ? "text-red-300" : "text-green-300"}`} data-alt="resend-feedback">
                {resendError || resendMessage}
              </div>
            )}

            <div className="grid grid-cols-2 gap-3">
              <button
                type="button"
                onClick={handleResend}
                disabled={resendCooldown > 0 || resendLoading}
                className="px-4 py-2 rounded-lg border border-white/15 text-white/90 hover:text-white hover:bg-white/10 transition-colors disabled:opacity-60 disabled:cursor-not-allowed"
                data-alt="resend-button"
              >
                {resendLoading
                  ? "Sending..."
                  : resendCooldown > 0
                  ? `Resend (${resendCooldown}s)`
                  : "Resend"}
              </button>
              <button
                type="button"
                onClick={() => router.push("/login")}
                className="px-4 py-2 rounded-lg bg-[#C039F6] hover:bg-[#C039F6]/80 text-white transition-colors"
                data-alt="go-login-button"
              >
                Confirm Activation and Login
              </button>
            </div>
          </div>
        </div>
      </div>
    )}
    </>
  );
}