relnet/frontend/src/components/auth/Login.tsx

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

const Login: React.FC = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);
  const { login } = useAuth();
  const navigate = useNavigate();

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

    try {
      await login({ email, password });
      navigate('/networks');
    } catch (err: any) {
      setError(err.response?.data?.message || 'Login failed. Please check your credentials.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="flex items-center justify-center min-h-screen bg-gray-100">
      <div className="w-full max-w-md p-6 bg-white rounded-lg shadow-md">
        <h2 className="text-2xl font-bold mb-6 text-center">Login</h2>

        {error && (
          <div className="bg-red-100 border border-red-400 text-red-700 px-4 py-3 rounded mb-4">
            {error}
          </div>
        )}

        <form onSubmit={handleSubmit}>
          <div className="mb-4">
            <label className="block text-gray-700 text-sm font-bold mb-2" htmlFor="email">
              Email
            </label>
            <input
              id="email"
              type="email"
              className="w-full px-3 py-2 border border-gray-300 rounded"
              value={email}
              onChange={e => setEmail(e.target.value)}
              required
            />
          </div>

          <div className="mb-6">
            <label className="block text-gray-700 text-sm font-bold mb-2" htmlFor="password">
              Password
            </label>
            <input
              id="password"
              type="password"
              className="w-full px-3 py-2 border border-gray-300 rounded"
              value={password}
              onChange={e => setPassword(e.target.value)}
              required
            />
          </div>

          <div className="flex items-center justify-between">
            <button
              type="submit"
              className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline"
              disabled={loading}
            >
              {loading ? 'Logging in...' : 'Login'}
            </button>
            <a
              href="/register"
              className="inline-block align-baseline font-bold text-sm text-blue-500 hover:text-blue-800"
            >
              Register
            </a>
          </div>
        </form>
      </div>
    </div>
  );
};

export default Login;