import { useState } from 'react';
import type { FormEvent } from 'react';
import { useNavigate } from 'react-router-dom';
import { api, setToken } from '../api/client';

export default function Login() {
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);
  const navigate = useNavigate();

  async function handleSubmit(e: FormEvent) {
    e.preventDefault();
    setError('');
    setLoading(true);
    try {
      const res = await api.post<{ token: string }>('/api/auth/login', { username, password });
      setToken(res.token);
      navigate('/');
    } catch (err) {
      setError((err as Error).message || 'Anmeldung fehlgeschlagen');
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50">
      <div className="bg-white rounded-lg shadow p-8 w-full max-w-sm">
        <h1 className="text-2xl font-bold text-gray-800 mb-6 text-center">E-Paper Display</h1>
        <form onSubmit={handleSubmit} className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Benutzername</label>
            <input
              type="text"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
              autoFocus
              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-sky-400"
            />
          </div>
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-1">Passwort</label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              required
              className="w-full border border-gray-300 rounded px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-sky-400"
            />
          </div>
          {error && <p className="text-red-600 text-sm">{error}</p>}
          <button
            type="submit"
            disabled={loading}
            className="w-full bg-sky-500 hover:bg-sky-600 text-white font-medium py-2 rounded transition-colors disabled:opacity-50"
          >
            {loading ? 'Anmelden...' : 'Anmelden'}
          </button>
        </form>
      </div>
    </div>
  );
}