import { useState, FormEvent } from 'react';
import styles from '../styles/Login.module.css';
import { Link } from 'react-router-dom';
import { useNavigate } from 'react-router-dom';
import axios from 'axios';
import Navbar from './Navbar';

function Login() {
  document.title = 'LinkLogger | Login';

  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const navigate = useNavigate();

  const handleSubmit = async (e: FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    setIsSubmitting(true);
    try {
      const res = await axios.post(
        '/api/auth/token',
        new URLSearchParams({
          username: username,
          password: password,
        }),
        {
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
          },
        }
      );

      if (res.status === 200) {
        navigate('/dashboard');
      }
    } catch (error: unknown) {
      if (axios.isAxiosError(error)) {
        const customErrorMessage = error.response?.data?.detail || null;
        setPassword('');
        setError(customErrorMessage || 'An error occurred. Please try again.');
      } else {
        setPassword('');
        setError('Unknown error. Please try again.');
      }
    } finally {
      setIsSubmitting(false);
    }
  };

  return (
    <>
      <Navbar />
      <div id={styles.container}>
        <p id={styles.loginText}>Log In</p>
        <p id={styles.error} className={error ? 'visible' : 'hidden'}>
          {error}
        </p>
        <div>
          <header>
            <hr></hr>
            <form onSubmit={handleSubmit}>
              <input
                type="text"
                placeholder="username"
                value={username}
                onChange={(e) => setUsername(e.target.value)}
                required
              />
              <input
                type="password"
                placeholder="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
              />
              <button type="submit" disabled={isSubmitting}>
                {isSubmitting ? 'Submitting...' : 'Submit'}
              </button>
            </form>
            <hr></hr>
            <p id={styles.bottomText}>
              Don't have an account?{' '}
              <Link to="/signup" className={styles.link}>
                Create one now
              </Link>
            </p>
          </header>
        </div>
      </div>
    </>
  );
}

export default Login;