WooNooW/includes/Api/TaxController.php

<?php
/**
 * Tax Settings REST API Controller
 *
 * @package WooNooW
 */

namespace WooNooW\Api;

use WP_REST_Controller;
use WP_REST_Server;
use WP_REST_Request;
use WP_REST_Response;
use WP_Error;

class TaxController extends WP_REST_Controller {

	/**
	 * Register routes
	 */
	public function register_routes() {
		$namespace = 'woonoow/v1';

		// Get tax settings
		register_rest_route(
			$namespace,
			'/settings/tax',
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_settings' ),
				'permission_callback' => array( $this, 'check_permission' ),
			)
		);

		// Toggle tax calculation
		register_rest_route(
			$namespace,
			'/settings/tax/toggle',
			array(
				'methods'             => WP_REST_Server::CREATABLE,
				'callback'            => array( $this, 'toggle_tax' ),
				'permission_callback' => array( $this, 'check_permission' ),
				'args'                => array(
					'enabled' => array(
						'required'          => true,
						'type'              => 'boolean',
						'sanitize_callback' => 'rest_sanitize_boolean',
					),
				),
			)
		);
	}

	/**
	 * Check permission
	 */
	public function check_permission() {
		return current_user_can( 'manage_woocommerce' );
	}

	/**
	 * Get tax settings
	 */
	public function get_settings( WP_REST_Request $request ) {
		try {
			$settings = array(
				'calc_taxes'          => get_option( 'woocommerce_calc_taxes', 'no' ),
				'prices_include_tax'  => get_option( 'woocommerce_prices_include_tax', 'no' ),
				'tax_based_on'        => get_option( 'woocommerce_tax_based_on', 'shipping' ),
				'tax_display_shop'    => get_option( 'woocommerce_tax_display_shop', 'excl' ),
				'tax_display_cart'    => get_option( 'woocommerce_tax_display_cart', 'excl' ),
				'standard_rates'      => $this->get_tax_rates( 'standard' ),
				'reduced_rates'       => $this->get_tax_rates( 'reduced-rate' ),
				'zero_rates'          => $this->get_tax_rates( 'zero-rate' ),
			);

			return new WP_REST_Response( $settings, 200 );
		} catch ( \Exception $e ) {
			return new WP_REST_Response(
				array(
					'error'   => 'fetch_failed',
					'message' => $e->getMessage(),
				),
				500
			);
		}
	}

	/**
	 * Toggle tax calculation
	 */
	public function toggle_tax( WP_REST_Request $request ) {
		try {
			$enabled = $request->get_param( 'enabled' );
			$value   = $enabled ? 'yes' : 'no';

			update_option( 'woocommerce_calc_taxes', $value );

			// Clear WooCommerce cache
			\WC_Cache_Helper::invalidate_cache_group( 'taxes' );
			\WC_Cache_Helper::get_transient_version( 'shipping', true );

			return new WP_REST_Response(
				array(
					'success' => true,
					'enabled' => $enabled,
					'message' => $enabled 
						? __( 'Tax calculation enabled', 'woonoow' )
						: __( 'Tax calculation disabled', 'woonoow' ),
				),
				200
			);
		} catch ( \Exception $e ) {
			return new WP_REST_Response(
				array(
					'error'   => 'update_failed',
					'message' => $e->getMessage(),
				),
				500
			);
		}
	}

	/**
	 * Get tax rates for a specific class
	 */
	private function get_tax_rates( $tax_class ) {
		global $wpdb;

		$rates = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT * FROM {$wpdb->prefix}woocommerce_tax_rates 
				WHERE tax_rate_class = %s 
				ORDER BY tax_rate_order ASC",
				$tax_class
			)
		);

		$formatted_rates = array();

		foreach ( $rates as $rate ) {
			$formatted_rates[] = array(
				'id'       => $rate->tax_rate_id,
				'country'  => $rate->tax_rate_country,
				'state'    => $rate->tax_rate_state,
				'rate'     => $rate->tax_rate,
				'name'     => $rate->tax_rate_name,
				'priority' => $rate->tax_rate_priority,
				'compound' => $rate->tax_rate_compound,
				'shipping' => $rate->tax_rate_shipping,
			);
		}

		return $formatted_rates;
	}
}