import { createSignal } from 'solid-js';
import { gql } from '@urql/core';
import { createMutation } from '@urql/solid';

const REGISTER_MUTATION = gql`
  mutation Register($email: String!, $username: String!, $password: String!) {
    register(email: $email, username: $username, password: $password) {
      accessToken
      refreshToken
      user {
        id
        username
        email
      }
    }
  }
`;

interface RegisterFormProps {
  onRegisterSuccess: (token: string, userId: string) => void;
}

export function RegisterForm(props: RegisterFormProps) {
  const [email, setEmail] = createSignal('');
  const [username, setUsername] = createSignal('');
  const [password, setPassword] = createSignal('');
  const [confirmPassword, setConfirmPassword] = createSignal('');
  const [error, setError] = createSignal('');

  const [state, executeMutation] = createMutation(REGISTER_MUTATION);

  const handleSubmit = async (e: Event) => {
    e.preventDefault();

    if (!email() || !username() || !password() || !confirmPassword()) {
      setError('Please fill in all fields');
      return;
    }

    if (password() !== confirmPassword()) {
      setError('Passwords do not match');
      return;
    }

    try {
      const result = await executeMutation({
        email: email(),
        username: username(),
        password: password(),
      });

      if (result.error) {
        setError(result.error.message);
        return;
      }

      if (result.data?.register) {
        const { accessToken, user } = result.data.register;
        window.localStorage.setItem('token', accessToken);
        window.localStorage.setItem('userId', user.id);
        props.onRegisterSuccess(accessToken, user.id);
      } else {
        setError('Registration failed: No data received from server');
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'An error occurred');
    }
  };

  return (
    <div class='register-form'>
      <h2>Register</h2>
      {error() && <div class='error'>{error()}</div>}
      <form onSubmit={handleSubmit}>
        <div class='form-group'>
          <label for='email'>Email</label>
          <input
            type='email'
            id='email'
            value={email()}
            onInput={(e) => setEmail(e.currentTarget.value)}
            required
          />
        </div>
        <div class='form-group'>
          <label for='username'>Username</label>
          <input
            type='text'
            id='username'
            value={username()}
            onInput={(e) => setUsername(e.currentTarget.value)}
            required
          />
        </div>
        <div class='form-group'>
          <label for='password'>Password</label>
          <input
            type='password'
            id='password'
            value={password()}
            onInput={(e) => setPassword(e.currentTarget.value)}
            required
          />
        </div>
        <div class='form-group'>
          <label for='confirm-password'>Confirm Password</label>
          <input
            type='password'
            id='confirm-password'
            value={confirmPassword()}
            onInput={(e) => setConfirmPassword(e.currentTarget.value)}
            required
          />
        </div>
        <button type='submit' disabled={state.fetching}>
          {state.fetching ? 'Registering...' : 'Register'}
        </button>
      </form>
    </div>
  );
}