woocommerce/plugins/woocommerce-admin/src/Features/Settings.php

<?php
/**
 * WooCommerce Settings.
 * NOTE: DO NOT edit this file in WooCommerce core, this is generated from woocommerce-admin.
 */

namespace Automattic\WooCommerce\Admin\Features;

use Automattic\WooCommerce\Admin\Marketing\InstalledExtensions;
use Automattic\WooCommerce\Admin\Loader;
use Automattic\WooCommerce\Admin\PageController;

/**
 * Contains backend logic for the Settings feature.
 */
class Settings {
	/**
	 * Option name used to toggle this feature.
	 */
	const TOGGLE_OPTION_NAME = 'woocommerce_settings_enabled';

	/**
	 * Class instance.
	 *
	 * @var Settings instance
	 */
	protected static $instance = null;

	/**
	 * Get class instance.
	 */
	public static function get_instance() {
		if ( ! self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Hook into WooCommerce.
	 */
	public function __construct() {
		if ( ! is_admin() ) {
			return;
		}

		add_filter( 'woocommerce_settings_features', array( $this, 'add_feature_toggle' ) );

		if ( 'yes' !== get_option( 'woocommerce_settings_enabled', 'no' ) ) {
			return;
		}

		// Run this after the original WooCommerce settings have been added.
		add_action( 'admin_menu', array( $this, 'register_pages' ), 60 );
	}

	/**
	 * Add the feature toggle to the features settings.
	 *
	 * @param array $features Feature sections.
	 * @return array
	 */
	public static function add_feature_toggle( $features ) {
		$features[] = array(
			'title' => __( 'Settings', 'woocommerce-admin' ),
			'desc'  => __(
				'Adds the new WooCommerce settings UI.',
				'woocommerce-admin'
			),
			'id'    => 'woocommerce_settings_enabled',
			'type'  => 'checkbox',
		);

		return $features;
	}

	/**
	 * Registers settings pages.
	 */
	public function register_pages() {
		$controller = PageController::get_instance();

		$setting_pages = \WC_Admin_Settings::get_settings_pages();
		$settings      = array();
		foreach ( $setting_pages as $setting_page ) {
			$settings = $setting_page->add_settings_page( $settings );
		}

		$order = 0;
		foreach ( $settings as $key => $setting ) {
			$order        += 10;
			$settings_page = array(
				'parent'   => 'woocommerce-settings',
				'title'    => $setting,
				'id'       => 'settings-' . $key,
				'path'     => "/settings/$key",
				'nav_args' => array(
					'capability' => 'manage_woocommerce',
					'order'      => $order,
					'parent'     => 'woocommerce-settings',
				),
			);

			// Replace the old menu with the first settings item.
			if ( 10 === $order ) {
				$this->replace_settings_page( $settings_page );
			}

			$controller->register_page( $settings_page );
		}
	}

	/**
	 * Replace the Settings page in the original WooCommerce menu.
	 *
	 * @param array $page Page used to replace the original.
	 */
	protected function replace_settings_page( $page ) {
		global $submenu;

		// Check if WooCommerce parent menu has been registered.
		if ( ! isset( $submenu['woocommerce'] ) ) {
			return;
		}

		foreach ( $submenu['woocommerce'] as &$item ) {
			// The "slug" (aka the path) is the third item in the array.
			if ( 0 === strpos( $item[2], 'wc-settings' ) ) {
				$item[2] = wc_admin_url( "&path={$page['path']}" );
			}
		}
	}
}