import type { NextPage } from 'next';
import Head from 'next/head';
import { useState, useEffect } from 'react';
import { useRouter } from 'next/router';
import { signIn, useSession } from 'next-auth/react';
import Link from 'next/link';
import toast from 'react-hot-toast';

const Login: NextPage = () => {
  const router = useRouter();
  const { status } = useSession();
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState('');

  useEffect(() => {
    if (status === 'authenticated') {
      router.push('/');
    }
  }, [status, router]);

  if (status !== 'unauthenticated') {
    return null;
  }

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setIsLoading(true);

    try {
      const result = await signIn('credentials', {
        email,
        password,
        redirect: false,
      });

      if (!result?.ok) {
        setError(result?.error || 'Přihlášení se nezdařilo');
        toast.error(result?.error || 'Přihlášení se nezdařilo');
        return;
      }

      toast.success('Úspěšně přihlášeni!');
      router.push('/profile');
    } catch (err) {
      setError('Přihlášení se nezdařilo. Prosím zkuste znovu.');
      toast.error('Přihlášení se nezdařilo');
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <>
      <Head>
        <title>Přihlášení | Vystříkejto.cz</title>
        <meta name="robots" content="noindex,nofollow,noarchive" />
      </Head>
      <div className="min-h-screen w-full flex flex-col bg-luxury-dark pt-16 sm:pt-20 md:pt-32">
      {/* Login Form */}
      <div className="w-full flex flex-col items-center justify-center px-4 sm:px-8 lg:px-12 py-12 lg:py-20">
        <div className="w-full max-w-sm">
          {/* Header */}
          <div className="mb-8 text-center">
            <h1 className="text-3xl sm:text-4xl lg:text-5xl font-aptos font-black text-luxury-gold mb-2">
              Přihlášení
            </h1>
          </div>

          {/* Error Message */}
          {error && (
            <div className="mb-6 p-4 bg-red-500/10 border border-red-500/30 rounded-lg">
              <p className="text-red-400 text-sm">{error}</p>
            </div>
          )}

          {/* Login Form */}
          <form onSubmit={handleSubmit} className="space-y-6">
            {/* Email Input */}
            <div>
              <label htmlFor="email" className="block text-luxury-light text-sm font-medium mb-2">
                E-mailová adresa
              </label>
              <input
                type="email"
                id="email"
                name="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                placeholder="Vaše e-mailová adresa"
                autoComplete="email"
                className="w-full px-4 py-3 bg-luxury-light/10 border border-luxury-gold/30 rounded-lg text-luxury-light placeholder:text-luxury-light/40 focus:outline-none focus:ring-2 focus:ring-luxury-gold focus:border-transparent transition-all"
                required
              />
            </div>

            {/* Password Input */}
            <div>
              <label htmlFor="password" className="block text-luxury-light text-sm font-medium mb-2">
                Heslo
              </label>
              <input
                type="password"
                id="password"
                name="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                placeholder="Vaše heslo"
                autoComplete="current-password"
                className="w-full px-4 py-3 bg-luxury-light/10 border border-luxury-gold/30 rounded-lg text-luxury-light placeholder:text-luxury-light/40 focus:outline-none focus:ring-2 focus:ring-luxury-gold focus:border-transparent transition-all"
                required
              />
            </div>

            {/* Remember Me & Forgot Password */}
            <div className="flex items-center justify-between">
              <label className="flex items-center gap-2 cursor-pointer">
                <input
                  type="checkbox"
                  className="w-4 h-4 bg-luxury-light/10 border border-luxury-gold/30 rounded cursor-pointer accent-luxury-gold"
                />
                <span className="text-luxury-light/70 text-sm">Pamatovat si mě</span>
              </label>
              <Link href="/forgot-password" className="text-luxury-gold hover:text-yellow-300 text-sm transition-colors">
                Zapomenuté heslo?
              </Link>
            </div>

            {/* Submit Button */}
            <button
              type="submit"
              disabled={isLoading}
              className="w-full py-3 bg-luxury-gold hover:bg-yellow-400 text-luxury-dark font-bold rounded-lg transition-colors duration-300 disabled:opacity-50 disabled:cursor-not-allowed text-lg"
            >
              {isLoading ? 'Přihlašuji...' : 'Přihlásit se'}
            </button>
          </form>

          {/* Divider */}
          <div className="my-8 flex items-center gap-4">
            <div className="flex-1 h-px bg-luxury-gold/20"></div>
            <span className="text-luxury-light/50 text-sm">nebo</span>
            <div className="flex-1 h-px bg-luxury-gold/20"></div>
          </div>

          {/* Google Sign In */}
          <button
            onClick={() => signIn('google', { callbackUrl: '/profile' })}
            className="w-full py-3 bg-white hover:bg-gray-100 text-gray-800 font-bold rounded-lg transition-colors duration-300 text-lg flex items-center justify-center gap-3 mb-4"
          >
            <svg className="w-5 h-5" viewBox="0 0 24 24">
              <path fill="#1F2937" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"/>
              <path fill="#34A853" d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"/>
              <path fill="#FBBC05" d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"/>
              <path fill="#EA4335" d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"/>
            </svg>
            Přihlásit se přes Google
          </button>

          {/* Sign Up Link */}
          <div className="text-center">
            <p className="text-luxury-light/70 text-sm">
              Nemáte účet?{' '}
              <Link href="/register" className="text-luxury-gold hover:text-yellow-300 font-semibold transition-colors">
                Vytvořit účet
              </Link>
            </p>
          </div>
        </div>
      </div>

    </div>
    </>
  );
};

export default Login;
