import { useState } from 'react';
import { useRouter } from 'next/router';

export default function LoginForm() {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const router = useRouter();

  const handleSubmit = async (e) => {
    e.preventDefault();
    setError('');

    try {
      const res = await fetch('/api/auth', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ username, password }),
      });

      const data = await res.json();

      if (data.success) {
        router.push('/admin');
      } else {
        setError('Ungültige Zugangsdaten');
      }
    } catch (error) {
      setError('Ein Fehler ist aufgetreten');
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50">
      <div className="max-w-md w-full space-y-8 p-8 bg-white rounded-lg shadow-md">
        <div>
          <h2 className="text-center text-3xl font-bold text-gray-900">Admin Login</h2>
        </div>
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          {error && (
            <div className="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded">
              {error}
            </div>
          )}
          <div className="rounded-md shadow-sm -space-y-px">
            <div>
              <input
                type="text"
                required
                value={username}
                onChange={(e) => setUsername(e.target.value)}
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Benutzername"
              />
            </div>
            <div>
              <input
                type="password"
                required
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="appearance-none rounded-none relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-b-md focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Passwort"
              />
            </div>
          </div>

          <div>
            <button
              type="submit"
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
            >
              Anmelden
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}