import { useState } from 'react';
import { useAuth } from '../context/AuthContext';
import { useNavigate } from 'react-router-dom';

export default function Login() {
  const { login } = useAuth();
  const navigate = useNavigate();
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

  async function handleSubmit(e) {
    e.preventDefault();
    setError('');

    if (!email.trim() || !password.trim()) {
      setError('Bitte E-Mail und Passwort eingeben.');
      return;
    }

    setLoading(true);
    try {
      await login(email.trim(), password);
      navigate('/', { replace: true });
    } catch (err) {
      if (err.code === 401) {
        setError('E-Mail oder Passwort falsch.');
      } else {
        setError('Verbindungsfehler. Bitte erneut versuchen.');
      }
    } finally {
      setLoading(false);
    }
  }

  return (
    <div className="login-page">
      <div className="login-card">
        <div className="login-header">
          <div className="logo">Defekt<span>Track</span></div>
          <p className="login-subtitle">Lager &amp; Logistik · Defekte Ware im Griff</p>
        </div>
        <form className="login-form" onSubmit={handleSubmit}>
          <div className="form-group">
            <label>E-Mail</label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              placeholder="name@firma.de"
              autoComplete="email"
              autoFocus
            />
          </div>
          <div className="form-group">
            <label>Passwort</label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              placeholder="Passwort eingeben"
              autoComplete="current-password"
            />
          </div>
          {error && <div className="login-error">{error}</div>}
          <button type="submit" className="btn-submit" disabled={loading}>
            {loading ? 'Anmelden...' : 'Anmelden'}
          </button>
        </form>
      </div>
    </div>
  );
}