Login Widget

					<?php
/**
 * Plugin Name: WP Turbo Custom Login
 * Description: Custom login page functionality that redirects users to their profile page using their display name.
 * Version: 1.0.0
 * Author: WP Turbo
 * Author URI: https://wpturbo.dev
 * Text Domain: wpturbo
 */

// If this file is called directly, abort.
if (!defined('WPINC')) {
    die;
}

// Start the session for error message handling
function wpturbo_start_session() {
    if (!session_id()) {
        session_start();
    }
}
add_action('init', 'wpturbo_start_session', 1);

// Display custom login errors
function wpturbo_show_error_messages() {
    if ($codes = wpturbo_get_error_codes()) {
        echo '<div class="wpturbo_error_messages">';
        foreach ($codes as $code) {
            $message = wpturbo_get_error_message($code);
            echo '<span class="error"><strong>' . esc_html__('Error', 'wpturbo') . '</strong>: ' . esc_html($message) . '</span><br/>';
        }
        echo '</div>';
    }
}

// Get error codes from the session
function wpturbo_get_error_codes() {
    return isset($_SESSION['wpturbo_login_errors']) ? $_SESSION['wpturbo_login_errors'] : array();
}

// Get the corresponding error message for a code
function wpturbo_get_error_message($error_code) {
    switch ($error_code) {
        case 'empty_username':
            return __('The username field is empty.', 'wpturbo');
        case 'empty_password':
            return __('The password field is empty.', 'wpturbo');
        default:
            return __('An unknown error occurred.', 'wpturbo');
    }
}

// Create the custom login form
function wpturbo_custom_login_form() {
    if (is_user_logged_in()) {
        return '<p>' . esc_html__('You are already logged in.', 'wpturbo') . '</p>';
    }

    ob_start();

    wpturbo_show_error_messages(); ?>

    <form id="wpturbo_login_form" action="" method="post">
        <fieldset>
            <p>
                <label for="wpturbo_user_login"><?php esc_html_e('Username', 'wpturbo'); ?></label>
                <input name="wpturbo_user_login" id="wpturbo_user_login" class="required" type="text"/>
            </p>
            <p>
                <label for="wpturbo_user_pass"><?php esc_html_e('Password', 'wpturbo'); ?></label>
                <input name="wpturbo_user_pass" id="wpturbo_user_pass" class="required" type="password"/>
            </p>
            <p>
                <input type="hidden" name="wpturbo_login_nonce" value="<?php echo wp_create_nonce('wpturbo-login-nonce'); ?>"/>
                <input type="submit" value="<?php esc_attr_e('Login', 'wpturbo'); ?>"/>
            </p>
            <p>
                <a href="<?php echo wp_lostpassword_url(); ?>"><?php esc_html_e('Lost your password?', 'wpturbo'); ?></a>
            </p>
        </fieldset>
    </form>
    <?php
    return ob_get_clean();
}

// Shortcode to insert the custom login form
add_shortcode('wpturbo_custom_login', 'wpturbo_custom_login_form');

// Process the login form submission
function wpturbo_process_login_form() {
    if (isset($_POST['wpturbo_user_login']) && isset($_POST['wpturbo_user_pass']) && isset($_POST['wpturbo_login_nonce']) && wp_verify_nonce($_POST['wpturbo_login_nonce'], 'wpturbo-login-nonce')) {
        $username = sanitize_text_field($_POST['wpturbo_user_login']);
        $password = $_POST['wpturbo_user_pass'];

        $credentials = [
            'user_login'    => $username,
            'user_password' => $password,
            'remember'      => true
        ];

        $user = wp_signon($credentials, is_ssl());

        if (is_wp_error($user)) {
            $_SESSION['wpturbo_login_errors'] = $user->get_error_codes();
            wp_redirect(wp_get_referer());
            exit;
        } else {
            // Fetch the user's display name to create a profile URL slug
            $user_info = get_userdata($user->ID);
            $display_name_slug = sanitize_title($user_info->display_name);
            
            // Redirect the user to their profile page using the display name
            $profile_url = trailingslashit(home_url('profile')) . $display_name_slug;
            wp_redirect(esc_url($profile_url));
            exit;
        }
    }
}
add_action('init', 'wpturbo_process_login_form');