import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { useAuth } from '../hooks/useAuth';
import { Shield, Loader2 } from 'lucide-react';

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

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');
    setLoading(true);
    try {
      await login(email, password);
      navigate('/alerts');
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Falha no login');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-gray-900 via-blue-900 to-gray-800 p-4">
      <div className="w-full max-w-sm">
        <div className="bg-white rounded-2xl shadow-xl p-8">
          <div className="text-center mb-8">
            <div className="inline-flex items-center justify-center w-14 h-14 rounded-xl bg-blue-600 mb-4">
              <Shield className="w-7 h-7 text-white" />
            </div>
            <h1 className="text-2xl font-bold text-gray-900">FraudShield</h1>
            <p className="text-sm text-gray-500 mt-1">Motor de Detecção de Fraudes</p>
          </div>

          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <label className="block text-sm font-medium text-gray-700 mb-1">Email</label>
              <input
                type="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 outline-none text-sm"
                placeholder="analista@fraudshield.local"
                required
              />
            </div>
            <div>
              <label className="block text-sm font-medium text-gray-700 mb-1">Senha</label>
              <input
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 outline-none text-sm"
                placeholder="••••••••"
                required
              />
            </div>

            {error && (
              <div className="bg-red-50 border border-red-200 text-red-700 px-3 py-2 rounded-lg text-sm">
                {error}
              </div>
            )}

            <button
              type="submit"
              disabled={loading}
              className="w-full py-2.5 bg-blue-600 hover:bg-blue-700 disabled:bg-blue-400 text-white font-medium rounded-lg transition-colors flex items-center justify-center gap-2"
            >
              {loading && <Loader2 className="w-4 h-4 animate-spin" />}
              Entrar
            </button>
          </form>

          <div className="mt-6 p-3 bg-gray-50 rounded-lg text-xs text-gray-500">
            <p className="font-medium mb-1">Credenciais de teste:</p>
            <p>analista@fraudshield.local / qualquer senha</p>
            <p>admin@fraudshield.local / qualquer senha</p>
          </div>
        </div>
      </div>
    </div>
  );
}