HAZMAT shipping options

<?php
/*
Plugin Name: HAZMAT Shipping Options
Plugin URI: 
Description: HAZMAT Shipping Options plugin
Version: 1.0.0
Author: sc
Author URI: 
*/

//define("PV_ATTRIBUTE", "vendor");
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Check if WooCommerce is active
 */
if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) ) {
	if ( ! class_exists( 'TH_Shipping_Options' ) ) {
		class TH_Shipping_Options {
			/**
			 * Constructor for your shipping class
			 *
			 * @access public
			 * @return void
			 */
			public function __construct() {
				add_filter( 'woocommerce_cart_shipping_packages', array( &$this, 'th_woocommerce_cart_shipping_packages') );
				// Overriding template to introduce vendor names along with standard labels across shipping packages.
				add_filter( 'woocommerce_locate_template', array( $this, 'th_woocommerce_locate_template' ), 10, 3 );
				//
				add_filter( 'woocommerce_package_rates', 'hide_shipping_for_shipping_class', 10, 3 );
				//
				add_action( 'woocommerce_cart_calculate_fees', 'wc_fee_per_shipping_class_item' );
				add_action( 'woocommerce_after_cart_item_quantity_update', 'wc_fee_per_shipping_class_item' );
			}
			
			function th_woocommerce_locate_template( $template, $template_name, $template_path ) { 
				if('cart/cart-shipping.php' == $template_name)
				{
						$path = plugin_dir_path( __FILE__ ) . '/woocommerce/templates/' . $template_name;  
						return file_exists( $path ) ? $path : $template;
				}
				return $template;
			}
	
			function th_woocommerce_cart_shipping_packages( $packages ) {
				// Reset the packages
				$packages = array();
				
				// Bulky items
				$bulky_items = array();
				$regular_items = array();

				// Sort bulky from regular
				foreach ( WC()->cart->get_cart() as $item ) {
					if ( $item['data']->needs_shipping() ) {
						if ( $item['data']->get_shipping_class() == 'hazmat' ) {
							$bulky_items[] = $item;
						} else {
							$regular_items[] = $item;
						}
					}
				}
				// Put inside packages
				if ( $regular_items ) {
					$packages[] = array(
						'contents' => $regular_items,
						'contents_cost' => array_sum( wp_list_pluck( $regular_items, 'line_total' ) ),
						'applied_coupons' => WC()->cart->applied_coupons,
						'destination' => array(
							'country' => WC()->customer->get_shipping_country(),
							'state' => WC()->customer->get_shipping_state(),
							'postcode' => WC()->customer->get_shipping_postcode(),
							'city' => WC()->customer->get_shipping_city(),
							'address' => WC()->customer->get_shipping_address(),
							'address_2' => WC()->customer->get_shipping_address_2()
						)
					);
				}  
				if ( $bulky_items ) {
					$packages[] = array(
						'ship_via' => array( 'fedex','ups' ),
						'contents' => $bulky_items,
						'contents_cost' => array_sum( wp_list_pluck( $bulky_items, 'line_total' ) ),
						'applied_coupons' => WC()->cart->applied_coupons,
						'destination' => array(
							'country' => WC()->customer->get_shipping_country(),
							'state' => WC()->customer->get_shipping_state(),
							'postcode' => WC()->customer->get_shipping_postcode(),
							'city' => WC()->customer->get_shipping_city(),
							'address' => WC()->customer->get_shipping_address(),
							'address_2' => WC()->customer->get_shipping_address_2()
						)
						
					);
				}
  return $packages;
}
}

// Hide shipping rates for HAZMAT shipping
function hide_shipping_for_shipping_class( $rates, $package ) {
// echo "<pre>" . print_r( $rates, true ) . "</pre> ";// printing the methods so I know the available methods to exclude
//  foreach ( WC()->cart->cart_contents AS $item ) { 
//        if ( has_term( 'hazmat', 'product_shipping_class', $item['product_id'] ) ) { 
				
				foreach ( WC()->cart->get_cart() as $item ) {
					if ( $item['data']->needs_shipping() ) {
						if ( $item['data']->get_shipping_class() == 'hazmat' ) {
					unset($rates['ups:01']);
					unset($rates['ups:02']);
//					unset($rates['ups:03']);					
					unset($rates['ups:59']);
//					unset($rates['fedex:FEDEX_GROUND']);
					unset($rates['fedex:FEDEX_EXPRESS_SAVER']);
					unset($rates['fedex:FEDEX_2_DAY_AM']);
					unset($rates['fedex:FIRST_OVERNIGHT']);
					unset($rates['fedex:PRIORITY_OVERNIGHT']);
					unset($rates['fedex:FEDEX_2_DAY']);
					unset($rates['fedex:STANDARD_OVERNIGHT']);					
        }
					}
    }
	return $rates;
}

//
function wc_fee_per_shipping_class_item() {
  global $woocommerce;

// Setup an array of shipping classes which correspond to those created in Woocommerce
$shippingclass_hazmat = array( 'hazmat' );
$spfee = 0.00; // initialize special fee
$spfeeperprod = 28.50; //special fee per product

	foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
	$shipping_class = get_the_terms( $values['product_id'], 'product_shipping_class' );
	$qty += $values['quantity']; 
	$spfee = $qty * $spfeeperprod;
    
if ( isset( $shipping_class[0]->slug ) && in_array( $shipping_class[0]->slug, $shippingclass_hazmat ) ) {
	$woocommerce->cart->add_fee( 'HAZMAT Fee*', $spfee, true, 'standard' );
}
	}
}
		// finally instantiate our plugin class and add it to the set of globals
		$GLOBALS['th_shipping_options_init'] = new TH_Shipping_Options();
	}

	// Start up this plugin
	add_action( 'init', 'TH_Shipping_Options' );
	function TH_Shipping_Options() {
		global $TH_Shipping_Options;
		$TH_Shipping_Options = new TH_Shipping_Options();
	}
}