const { useState } = React;

const TeacherLogin = ({ onLogin }) => {
  const [email, setEmail] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

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

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

      const data = await res.json();
      if (res.ok) {
        onLogin(data.faculty);
      } else {
        setError(data.error || 'Login failed');
      }
    } catch (err) {
      setError('Network error');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-100 p-4">
      <div className="bg-white p-8 rounded-2xl shadow-xl w-full max-w-md">
        <div className="flex flex-col items-center mb-8">
          <div className="w-16 h-16 bg-blue-100 rounded-full flex items-center justify-center mb-4 text-blue-600 text-2xl font-bold">
            !
          </div>
          <h2 className="text-2xl font-bold text-gray-800">Teacher Login</h2>
          <p className="text-gray-500 mt-2">Sign in to record attendance</p>
        </div>

        {error && (
          <div className="bg-red-50 text-red-600 p-3 rounded-lg mb-6 text-sm">
            {error}
          </div>
        )}

        <form onSubmit={handleSubmit} className="space-y-6">
          <div>
            <label className="block text-sm font-medium text-gray-700 mb-2">
              Email Address
            </label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="w-full px-4 py-3 rounded-lg border border-gray-300 focus:ring-2 focus:ring-blue-500 focus:border-transparent outline-none transition"
              placeholder="teacher@example.com"
              required
            />
          </div>

          <button
            type="submit"
            disabled={loading}
            className="w-full bg-blue-600 text-white py-3 rounded-lg font-semibold hover:bg-blue-700 transition disabled:opacity-50"
          >
            {loading ? 'Signing in...' : 'Sign In'}
          </button>
        </form>
      </div>
    </div>
  );
};

window.TeacherLogin = TeacherLogin;