<?php
/**
 * Kkart KKART_AJAX. AJAX Event Handlers.
 *
 * @class   KKART_AJAX
 * @package Kkart\Classes
 */

use Automattic\Jetpack\Constants;
use Automattic\Kkart\Utilities\NumberUtil;

defined( 'ABSPATH' ) || exit;

/**
 * KKART_Ajax class.
 */
class KKART_AJAX {

	/**
	 * Hook in ajax handlers.
	 */
	public static function init() {
		add_action( 'init', array( __CLASS__, 'define_ajax' ), 0 );
		add_action( 'template_redirect', array( __CLASS__, 'do_kkart_ajax' ), 0 );
		self::add_ajax_events();
	}

	/**
	 * Get KKART Ajax Endpoint.
	 *
	 * @param string $request Optional.
	 *
	 * @return string
	 */
	public static function get_endpoint( $request = '' ) {
		return esc_url_raw( apply_filters( 'kkart_ajax_get_endpoint', add_query_arg( 'kkart-ajax', $request, remove_query_arg( array( 'remove_item', 'add-to-cart', 'added-to-cart', 'order_again', '_wpnonce' ), home_url( '/', 'relative' ) ) ), $request ) );
	}

	/**
	 * Set KKART AJAX constant and headers.
	 */
	public static function define_ajax() {
		// phpcs:disable
		if ( ! empty( $_GET['kkart-ajax'] ) ) {
			kkart_maybe_define_constant( 'DOING_AJAX', true );
			kkart_maybe_define_constant( 'KKART_DOING_AJAX', true );
			if ( ! WP_DEBUG || ( WP_DEBUG && ! WP_DEBUG_DISPLAY ) ) {
				@ini_set( 'display_errors', 0 ); // Turn off display_errors during AJAX events to prevent malformed JSON.
			}
			$GLOBALS['wpdb']->hide_errors();
		}
		// phpcs:enable
	}

	/**
	 * Send headers for KKART Ajax Requests.
	 *
	 * @since 2.5.0
	 */
	private static function kkart_ajax_headers() {
		if ( ! headers_sent() ) {
			send_origin_headers();
			send_nosniff_header();
			kkart_nocache_headers();
			header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
			header( 'X-Robots-Tag: noindex' );
			status_header( 200 );
		} elseif ( Constants::is_true( 'WP_DEBUG' ) ) {
			headers_sent( $file, $line );
			trigger_error( "kkart_ajax_headers cannot set headers - headers already sent by {$file} on line {$line}", E_USER_NOTICE ); // @codingStandardsIgnoreLine
		}
	}

	/**
	 * Check for KKART Ajax request and fire action.
	 */
	public static function do_kkart_ajax() {
		global $wp_query;

		// phpcs:disable WordPress.Security.NonceVerification.Recommended
		if ( ! empty( $_GET['kkart-ajax'] ) ) {
			$wp_query->set( 'kkart-ajax', sanitize_text_field( wp_unslash( $_GET['kkart-ajax'] ) ) );
		}

		$action = $wp_query->get( 'kkart-ajax' );

		if ( $action ) {
			self::kkart_ajax_headers();
			$action = sanitize_text_field( $action );
			do_action( 'kkart_ajax_' . $action );
			wp_die();
		}
		// phpcs:enable
	}

	/**
	 * Hook in methods - uses WordPress ajax handlers (admin-ajax).
	 */
	public static function add_ajax_events() {
		$ajax_events_nopriv = array(
			'get_refreshed_fragments',
			'apply_coupon',
			'remove_coupon',
			'update_shipping_method',
			'get_cart_totals',
			'update_order_review',
			'add_to_cart',
			'remove_from_cart',
			'checkout',
			'get_variation',
			'get_customer_location',
			'get_cart_items',
			'set_cart_quantity',
			'get_cart_data',
			'cart_update_quantity'
		);

		foreach ( $ajax_events_nopriv as $ajax_event ) {
			add_action( 'wp_ajax_kkart_' . $ajax_event, array( __CLASS__, $ajax_event ) );
			add_action( 'wp_ajax_nopriv_kkart_' . $ajax_event, array( __CLASS__, $ajax_event ) );

			// KKART AJAX can be used for frontend ajax requests.
			add_action( 'kkart_ajax_' . $ajax_event, array( __CLASS__, $ajax_event ) );
		}

		$ajax_events = array(
			'feature_product',
			'mark_order_status',
			'get_order_details',
			'add_attribute',
			'add_new_attribute',
			'remove_variation',
			'remove_variations',
			'save_attributes',
			'add_variation',
			'link_all_variations',
			'revoke_access_to_download',
			'grant_access_to_download',
			'get_customer_details',
			'add_order_item',
			'add_order_fee',
			'add_order_shipping',
			'add_order_tax',
			'add_coupon_discount',
			'remove_order_coupon',
			'remove_order_item',
			'remove_order_tax',
			'reduce_order_item_stock',
			'increase_order_item_stock',
			'add_order_item_meta',
			'remove_order_item_meta',
			'calc_line_taxes',
			'save_order_items',
			'load_order_items',
			'add_order_note',
			'delete_order_note',
			'json_search_products',
			'json_search_products_and_variations',
			'json_search_downloadable_products_and_variations',
			'json_search_customers',
			'json_search_categories',
			'term_ordering',
			'product_ordering',
			'refund_line_items',
			'delete_refund',
			'rated',
			'update_api_key',
			'load_variations',
			'save_variations',
			'bulk_edit_variations',
			'tax_rates_save_changes',
			'shipping_zones_save_changes',
			'shipping_zone_add_method',
			'shipping_zone_methods_save_changes',
			'shipping_zone_methods_save_settings',
			'shipping_classes_save_changes',
			'toggle_gateway_enabled',
			'product_archives',
			'cart_update_price_details',
			'get_states',
			'user_auth',
			'get_product_variants',
			'create_variable_product',
			'save_billing_address',
			'delete_address',
			'get_address_details',
			'set_billing_address',
			'checkout_tabs_procceed',
			'account_order_details',
			'get_order_lists',
			'get_order_downloads',
			'set_variant_data',
			'delete_all_variations',
			'delete_variant',
			'reload_cart_tab',
			'check_postcode',
			'get_country_locale',
		);

		foreach ( $ajax_events as $ajax_event ) {
			add_action( 'wp_ajax_kkart_' . $ajax_event, array( __CLASS__, $ajax_event ) );
		}
	}

	/**
	 * Get a refreshed cart fragment, including the mini cart HTML.
	 */
	public static function get_refreshed_fragments() {
		ob_start();

		kkart_mini_cart();

		$mini_cart = ob_get_clean();

		$data = array(
			'fragments' => apply_filters(
				'kkart_add_to_cart_fragments',
				array(
					'div.widget_shopping_cart_content' => '<div class="widget_shopping_cart_content">' . $mini_cart . '</div>',
				)
			),
			'cart_hash' => KKART()->cart->get_cart_hash(),
		);

		wp_send_json( $data );
	}

	/**
	 * AJAX apply coupon on checkout page.
	 */
	public static function apply_coupon() {

		check_ajax_referer( 'kkart_ajax', 'security' );

		if ( ! empty( $_POST['coupon_code'] ) ) {
			KKART()->cart->add_discount( kkart_format_coupon_code( wp_unslash( $_POST['coupon_code'] ) ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		} else {
			kkart_add_notice( KKART_Coupon::get_generic_coupon_error( KKART_Coupon::E_KKART_COUPON_PLEASE_ENTER ), 'error' );
		}

		kkart_print_notices();
		wp_die();
	}

	/**
	 * AJAX remove coupon on cart and checkout page.
	 */
	public static function remove_coupon() {
		check_ajax_referer( 'kkart_ajax', 'security' );

		$coupon = isset( $_POST['coupon'] ) ? kkart_format_coupon_code( wp_unslash( $_POST['coupon'] ) ) : false; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		if ( empty( $coupon ) ) {
			kkart_add_notice( __( 'Sorry there was a problem removing this coupon.', 'kkart' ), 'error' );
		} else {
			KKART()->cart->remove_coupon( $coupon );
			kkart_add_notice( __( 'Coupon has been removed.', 'kkart' ) );
		}

		kkart_print_notices();
		wp_die();
	}

	/**
	 * AJAX update shipping method on cart page.
	 */
	public static function update_shipping_method() {
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		kkart_maybe_define_constant( 'KKART_CART', true );
		
		$chosen_shipping_methods = KKART()->session->get( 'chosen_shipping_methods' );
		$posted_shipping_methods = isset( $_POST['shipping_method'] ) ? (array) kkart_clean( wp_unslash( $_POST['shipping_method'] ) ) : array();

		if ( is_array( $posted_shipping_methods ) ) {
			foreach ( $posted_shipping_methods as $i => $value ) {
				$chosen_shipping_methods[ $i ] = $value;
			}
		}

		KKART()->session->set( 'chosen_shipping_methods', $chosen_shipping_methods );

		KKART()->cart->calculate_shipping();
		KKART()->cart->calculate_totals();
		
		$cart_details = ($_REQUEST['cart'] == '1') ? true : false;
		$data = self::cart_update_price_details($cart_details);
					
		wp_send_json( $data);
	}

	/**
	 * AJAX receive updated cart_totals div.
	 */
	public static function get_cart_totals() {
		kkart_maybe_define_constant( 'KKART_CART', true );
		KKART()->cart->calculate_totals();
		kkart_cart_totals();
		wp_die();
	}

	/**
	 * Session has expired.
	 */
	private static function update_order_review_expired() {
		wp_send_json(
			array(
				'fragments' => apply_filters(
					'kkart_update_order_review_fragments',
					array(
						'form.kkart-checkout' => '<div class="kkart-error">' . __( 'Sorry, your session has expired.', 'kkart' ) . ' <a href="' . esc_url( kkart_get_page_permalink( 'shop' ) ) . '" class="kkart-backward">' . __( 'Return to shop', 'kkart' ) . '</a></div>',
					)
				),
			)
		);
	}

	/**
	 * AJAX update order review on checkout.
	 */
	public static function update_order_review() {
		check_ajax_referer( 'update-order-review', 'security' );

		kkart_maybe_define_constant( 'KKART_CHECKOUT', true );

		if ( KKART()->cart->is_empty() && ! is_customize_preview() && apply_filters( 'kkart_checkout_update_order_review_expired', true ) ) {
			self::update_order_review_expired();
		}

		do_action( 'kkart_checkout_update_order_review', isset( $_POST['post_data'] ) ? wp_unslash( $_POST['post_data'] ) : '' ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		$chosen_shipping_methods = KKART()->session->get( 'chosen_shipping_methods' );
		$posted_shipping_methods = isset( $_POST['shipping_method'] ) ? kkart_clean( wp_unslash( $_POST['shipping_method'] ) ) : array();

		if ( is_array( $posted_shipping_methods ) ) {
			foreach ( $posted_shipping_methods as $i => $value ) {
				$chosen_shipping_methods[ $i ] = $value;
			}
		}

		KKART()->session->set( 'chosen_shipping_methods', $chosen_shipping_methods );
		KKART()->session->set( 'chosen_payment_method', empty( $_POST['payment_method'] ) ? '' : kkart_clean( wp_unslash( $_POST['payment_method'] ) ) );
		KKART()->customer->set_props(
			array(
				'billing_country'   => isset( $_POST['country'] ) ? kkart_clean( wp_unslash( $_POST['country'] ) ) : null,
				'billing_state'     => isset( $_POST['state'] ) ? kkart_clean( wp_unslash( $_POST['state'] ) ) : null,
				'billing_postcode'  => isset( $_POST['postcode'] ) ? kkart_clean( wp_unslash( $_POST['postcode'] ) ) : null,
				'billing_city'      => isset( $_POST['city'] ) ? kkart_clean( wp_unslash( $_POST['city'] ) ) : null,
				'billing_address_1' => isset( $_POST['address'] ) ? kkart_clean( wp_unslash( $_POST['address'] ) ) : null,
				'billing_address_2' => isset( $_POST['address_2'] ) ? kkart_clean( wp_unslash( $_POST['address_2'] ) ) : null,
			)
		);

		if ( kkart_ship_to_billing_address_only() ) {
			KKART()->customer->set_props(
				array(
					'shipping_country'   => isset( $_POST['country'] ) ? kkart_clean( wp_unslash( $_POST['country'] ) ) : null,
					'shipping_state'     => isset( $_POST['state'] ) ? kkart_clean( wp_unslash( $_POST['state'] ) ) : null,
					'shipping_postcode'  => isset( $_POST['postcode'] ) ? kkart_clean( wp_unslash( $_POST['postcode'] ) ) : null,
					'shipping_city'      => isset( $_POST['city'] ) ? kkart_clean( wp_unslash( $_POST['city'] ) ) : null,
					'shipping_address_1' => isset( $_POST['address'] ) ? kkart_clean( wp_unslash( $_POST['address'] ) ) : null,
					'shipping_address_2' => isset( $_POST['address_2'] ) ? kkart_clean( wp_unslash( $_POST['address_2'] ) ) : null,
				)
			);
		} else {
			KKART()->customer->set_props(
				array(
					'shipping_country'   => isset( $_POST['s_country'] ) ? kkart_clean( wp_unslash( $_POST['s_country'] ) ) : null,
					'shipping_state'     => isset( $_POST['s_state'] ) ? kkart_clean( wp_unslash( $_POST['s_state'] ) ) : null,
					'shipping_postcode'  => isset( $_POST['s_postcode'] ) ? kkart_clean( wp_unslash( $_POST['s_postcode'] ) ) : null,
					'shipping_city'      => isset( $_POST['s_city'] ) ? kkart_clean( wp_unslash( $_POST['s_city'] ) ) : null,
					'shipping_address_1' => isset( $_POST['s_address'] ) ? kkart_clean( wp_unslash( $_POST['s_address'] ) ) : null,
					'shipping_address_2' => isset( $_POST['s_address_2'] ) ? kkart_clean( wp_unslash( $_POST['s_address_2'] ) ) : null,
				)
			);
		}

		if ( isset( $_POST['has_full_address'] ) && kkart_string_to_bool( kkart_clean( wp_unslash( $_POST['has_full_address'] ) ) ) ) {
			KKART()->customer->set_calculated_shipping( true );
		} else {
			KKART()->customer->set_calculated_shipping( false );
		}

		KKART()->customer->save();

		// Calculate shipping before totals. This will ensure any shipping methods that affect things like taxes are chosen prior to final totals being calculated. Ref: #22708.
		KKART()->cart->calculate_shipping();
		KKART()->cart->calculate_totals();

		// Get order review fragment.
		ob_start();
		kkart_order_review();
		$kkart_order_review = ob_get_clean();

		// Get checkout payment fragment.
		ob_start();
		kkart_checkout_payment();
		$kkart_checkout_payment = ob_get_clean();

		// Get messages if reload checkout is not true.
		$reload_checkout = isset( KKART()->session->reload_checkout ) ? true : false;
		if ( ! $reload_checkout ) {
			$messages = kkart_print_notices( true );
		} else {
			$messages = '';
		}

		unset( KKART()->session->refresh_totals, KKART()->session->reload_checkout );

		wp_send_json(
			array(
				'result'    => empty( $messages ) ? 'success' : 'failure',
				'messages'  => $messages,
				'reload'    => $reload_checkout,
				'fragments' => apply_filters(
					'kkart_update_order_review_fragments',
					array(
						'.kkart-checkout-review-order-table' => $kkart_order_review,
						'.kkart-checkout-payment' => $kkart_checkout_payment,
					)
				),
			)
		);
	}

	/**
	 * AJAX add to cart.
	 */
	public static function add_to_cart() {
		ob_start();

		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( ! isset( $_POST['product_id'] ) ) {
			return;
		}

		$product_id        = apply_filters( 'kkart_add_to_cart_product_id', absint( $_POST['product_id'] ) );
		$product           = kkart_get_product( $product_id );
		$quantity          = empty( $_POST['quantity'] ) ? 1 : kkart_stock_amount( wp_unslash( $_POST['quantity'] ) );
		$passed_validation = apply_filters( 'kkart_add_to_cart_validation', true, $product_id, $quantity );
		$product_status    = get_post_status( $product_id );
		$variation_id      = 0;
		$variation         = array();

		if ( $product && 'variation' === $product->get_type() ) {
			$variation_id = $product_id;
			$product_id   = $product->get_parent_id();
			$variation    = $product->get_variation_attributes();
		}

		if ( $passed_validation && false !== KKART()->cart->add_to_cart( $product_id, $quantity, $variation_id, $variation ) && 'publish' === $product_status ) {

			do_action( 'kkart_ajax_added_to_cart', $product_id );

			if ( 'yes' === get_option( 'kkart_cart_redirect_after_add' ) ) {
				kkart_add_to_cart_message( array( $product_id => $quantity ), true );
			}

			self::get_refreshed_fragments();

		} else {

			// If there was an error adding to the cart, redirect to the product page to show any errors.
			$data = array(
				'error'       => true,
				'product_url' => apply_filters( 'kkart_cart_redirect_after_error', get_permalink( $product_id ), $product_id ),
			);

			wp_send_json( $data );
		}
		// phpcs:enable
	}
	
	// TODO check for security start
	public static function cart_update_price_details($cart = false){
		$cart_ob = KKART()->cart;	
		
		ob_start();
		kkart_cart_totals_order_total_html();
		$grand_total = ob_get_clean();	
		
		$data = array(
			'grand_total' => $grand_total,
			'sub_total' => $cart_ob->get_cart_subtotal(),
			'all_items_total' => $cart_ob->get_cart_total(),
		);
		
		if( kkart_tax_enabled() && ! KKART()->cart->display_prices_including_tax() ){
			$data['tax'] = kkart_tax_amount_html();
		}
		if( 'yes' == get_option( 'kkart_enable_coupons' ) ) {
			$data['discount'] = kkart_coupon_price_html();
		} 
		if( ! $cart || 'yes' == get_option( 'kkart_enable_shipping_calc' ) ) {
			$data['grand_total'] = $grand_total;
		}
		if( ! $cart ) {
			$data['delivery_charges'] = $cart_ob->get_cart_shipping_total();
		}
		
		return $data;
	}

	public static function cart_update_quantity(){
		
		$cart_item_key = kkart_clean( isset($_POST['cart_item_key']) ) ? wp_unslash( $_POST['cart_item_key'] ) : '';
		$quantity = kkart_clean( isset($_POST['quantity']) ) ? wp_unslash( $_POST['quantity'] ) : '';
		
		$cart_item = KKART()->cart->get_cart();
		
		$product = kkart_get_product($cart_item[$cart_item_key]['data']);
		
		$max_value = $product->get_max_purchase_quantity();
		
		if( 0 < $max_value && $quantity > $max_value){
			$quantity = $max_value;
		}
		
		KKART()->cart->set_quantity($cart_item_key, $quantity);
		
		$subtotal = KKART()->cart->get_product_subtotal($product, $quantity);
		$data = self::cart_update_price_details();
		$data['product_subtotal'] = $subtotal;
		
		wp_send_json($data);
	}	
	
	/**
	 * AJAX get state data
	 */
	public static function get_states(){
		
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$selected_country = kkart_clean(isset($_POST['country_name']) ? wp_unslash($_POST['country_name']) : '');
		$states = KKART()->countries->get_states( $selected_country );
		wp_send_json($states);
	}
	
	/**
	 * AJAX get state data
	 */   
	public static function get_country_locale(){
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		$locale =  KKART()->countries->get_country_locale();
		wp_send_json($locale);
	}

	/**
	 * AJAX get state data
	 */
	public static function check_postcode(){
		
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$country = kkart_clean(isset($_POST['selected_country']) ? wp_unslash($_POST['selected_country']) : '');
		$postcode = kkart_clean(isset($_POST['post_code']) ?  wp_unslash($_POST['post_code']) : '');

		$postcode_res = KKART_Validation::is_postcode( $postcode, $country);
		wp_send_json($postcode_res);
	}
	
	/**
	 * AJAX confirm USER login
	 */
	public static function user_auth(){
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$user_data = get_userdata(get_current_user_id());

		$data = array(
			'isLoggedIn' => is_user_logged_in(),
			'display_name' => $user_data->data->display_name,
			'user_email' => $user_data->data->user_email
		);
		
		wp_send_json($data);
		
	}
	
	/**
	 * AJAX get product variants data and shipping classes
	 */
	public static function get_product_variants(){
		check_ajax_referer( 'kkart_editor_nonce', 'kkart_nonce' );
		
		$attribute_tax = self::get_attribute_taxonomy();
		
		$shipping_classes = get_terms( array('taxonomy' => 'product_shipping_class', 'hide_empty' => false ) );
		$product_id = kkart_clean(isset($_POST['product_id']) ? wp_unslash($_POST['product_id']) : '');
		$product = kkart_get_product( $product_id );
		$product->has_child() ? $variations = $product->get_available_variations() : $variations = '';
		
		$variation_data =[];
		$product_id     = absint( $product_id );
		$post           = get_post( $product_id ); // phpcs:ignore
		$product_object = kkart_get_product( $product_id );
		$product_children   = kkart_get_products(
			array(
				'status'  => array( 'private', 'publish', 'draft' ),
				'type'    => 'variation',
				'parent'  => $product_id,
				'limit' => 50,
				'orderby' => array(
					'menu_order' => 'ASC',
					'ID'         => 'DESC',
				),
				'return'  => 'objects',
			)
		);

		
		if ( !empty($product_children) ) {
		
			foreach ( $product_children as $child_product ) {
				$variation_object = kkart_get_product($child_product);
				$variation_id   = $variation_object->get_id();
				$variation      = get_post( $variation_id );		
				$variation_object_data = array(
					'attributes' => kkart_get_product_variation_attributes( $variation_id ),
					'variation_id' => $variation_id,
					'status' => $variation_object->get_status(),
					'description' => $variation_object->get_description(),
					'sku' => $variation_object->get_sku(),
					'price' => $variation_object->get_price(),
					'regular_price' => $variation_object->get_regular_price(),
					'sale_price' => $variation_object->get_sale_price(),
					'date_on_sale_from' => $variation_object->get_date_on_sale_from(),
					'date_on_sale_to' => $variation_object->get_date_on_sale_to(),
					'manage_stock' => $variation_object->get_manage_stock(),
					'stock_quantity' => $variation_object->get_stock_quantity(),
					'stock_status' => $variation_object->get_stock_status(),
					'backorders' => $variation_object->get_backorders(),
					'weight' => $variation_object->get_weight(),
					'length' => $variation_object->get_length(),
					'width' => $variation_object->get_width(),
					'height' => $variation_object->get_height(),
					'virtual' => $variation_object->get_virtual(),
					'downloadable' => $variation_object->get_downloadable(),
					'downloads' => $variation_object->get_downloads(),
					'shipping_class_id' => $variation_object->get_shipping_class_id(),
					'shipping_class' => $variation_object->get_shipping_class(),
					'image_id' => $variation_object->get_image_id(),
					'image' => wp_get_attachment_url($variation_object->get_image_id()),
					'download_limit' => $variation_object->get_download_limit(),
					'download_expiry' => $variation_object->get_download_expiry(),
					'attribute_summary' => $variation_object->get_attribute_summary()
				);
				
				array_push($variation_data, $variation_object_data);
				
			}
		}
		
		
		$data = array(
			'variation' => $variation_data,
			'attribute_tax' => $attribute_tax,
			'shipping_classes' => $shipping_classes,
			'message' => 'Success'
		);
		
		if( empty($variation_data) ){
			$data['message'] = 'No Variant found';
		}
		
		wp_send_json($data);
		
	}
	
	/**
	 * AJAX to create variable poroduct
	 **/
	public static function create_variable_product(){
		check_ajax_referer( 'kkart_editor_nonce', 'kkart_nonce' );
		
		$attribute_data = kkart_clean(isset($_POST['attribute_data']) ? wp_unslash($_POST['attribute_data']) : '');
		$product_id = kkart_clean(isset($_POST['product_id']) ? wp_unslash($_POST['product_id']) : '');
		$variant_data = kkart_clean(isset($_POST['variant_data']) ? wp_unslash($_POST['variant_data']) : '');
		
		$attribute_data = json_decode($attribute_data,true);
		$variant_data = json_decode($variant_data,true);
		
		$product = kkart_get_product($product_id);

		if( is_a($product, 'KKART_Product') && !$product->is_type('variable') && !$product->has_child() ){
			$product = new KKART_Product_Variable($product_id);
		}
		
		if(empty($attribute_data)){
			$product_children   = kkart_get_products(
				array(
					'status'  => array( 'private', 'publish', 'draft' ),
					'type'    => 'variation',
					'parent'  => $product->get_id(),
					'orderby' => array(
						'menu_order' => 'ASC',
						'ID'         => 'DESC',
					),
					'return'  => 'objects',
				)
			);
			
			if(!empty($product_children)){
				foreach($product_children as $children){
					$children->delete();
				}
			}
		}
		
		$attribute = self::create_product_attribute($product,$attribute_data);
	
		if(count($attribute) > 0){
			$variant = self::create_product_variants($attribute[0],$product, $variant_data);
		}
		
		wp_send_json($attribute);

	}
	
	//matches the input variant types to already defined attribute taxonomy terms
	public static function matchTerms($attribute,$input_attributes){
		$term_id = [];
		(gettype($attribute) == 'array') ? $options = (array) $attribute : $options = (array) $attribute->get_options();
		
		foreach($options as $option){
		
			foreach($input_attributes['types'] as $type){
				
				if(term_exists($type, $input_attributes['name'])){
					array_push($term_id,(gettype($attribute) == 'array') ? $option->term_id : $option);
				}
			
			}
			
		}
		return $term_id;
	}
	
	//Creates product attribute
	public static function create_product_attribute($product, $attribute_data){
		
		
		$id = [];
		foreach($attribute_data as $input_attribute){
			$attributes = (array) $product->get_attributes();
			
			if(array_key_exists( $input_attribute['name'], $attributes ) && taxonomy_exists($input_attribute['name'])){
				
					foreach($attributes as $key => $attribute){
			
						if($key == $input_attribute['name'] && taxonomy_exists($input_attribute['name'])){
							$term_id = self::matchTerms($attribute,$input_attribute);
							$attribute->set_options($term_id);
							$attributes[$key] = $attribute;
						}		
					}
					$product->set_attributes($attributes);
					array_push($id,$product->save());
					continue;
			}
			
			$attribute = new KKART_Product_Attribute();
			$attribute->set_name($input_attribute['name']);
			
			if(taxonomy_exists($input_attribute['name'])){
				
				$terms = get_terms([
					'taxonomy' => $input_attribute['name'],
					'hide_empty' => false,
				]);
				
				$term_id = self::matchTerms($terms,$input_attribute);
				
				// $terms = [];
				// foreach($term_id as $term){
					// array_push($terms,get_term($term)->name); //getting term name from id
				// }
			}
			
			(!empty($term_id)) ? $options = $term_id : $options = $input_attribute['types'];
			
			$attribute->set_options($options);
			$term_id = []; //cleaning
			$attribute->set_position( 1 );
			$attribute->set_visible( 1 );
			$attribute->set_variation( 1 );
			$attributes[$attribute->get_name()] = $attribute;
			
			$product->set_attributes($attributes);
			
			array_push($id,$product->save());
			
			//linking the attribute taxonomy terms to the product attribute types
			if(!empty($term)){
				
				foreach($terms as $term_name){

					if( ! has_term( $term_name, $input_attribute['name'], $product->get_id() ) && taxonomy_exists($input_attribute['name'])){
						wp_set_object_terms($product->get_id(), sanitize_title($term_name), $input_attribute['name'], true );
					}
				}
			}
		}
		
		return $id;
	}
	
	//creates variants
	public static function create_product_variants($id, $product, $variants){
		
			$product_children   = kkart_get_products(
				array(
					'status'  => array( 'private', 'publish', 'draft' ),
					'type'    => 'variation',
					'parent'  => $product->get_id(),
					'orderby' => array(
						'menu_order' => 'ASC',
						'ID'         => 'DESC',
					),
					'return'  => 'objects',
				)
			);
			if(!empty($product_children)){
				foreach($product_children as $children){
					$children->delete();
				}
			}
		foreach($variants as $variant){
			
			//if(isset($variant['attribute_name']) && isset($variant['variant']) && empty($variant['variation_id'])){
				
				$variation = new KKART_Product_Variation();
				$variation->set_parent_id($id);
				
				self::set_variant($variation,$variant);
				
				$variation_id = $variation->save(); 
				
			//}elseif(!empty($variant['variation_id'])){
				
				//self::update_product_variants($variant);
			
			//}
		}
	}
	
	public static function edit_attribute_taxonomy(){
		//print_r();
	}
	
	//sets the variant
	public static function set_variant($variation, $variant){
		
		$attributes      = array(); // Initializing
		$attribute_names = (array) $variant['attribute_name'];
		$attribute_terms = (array) $variant['variant']; 
	
		// Formatting attributes data array
		foreach( $attribute_names as $key => $attribute_name ){
			$attributes[sanitize_title($attribute_name)] = $attribute_terms[$key];
		}
		
		$variation->set_attributes($attributes); 
	}
	
	// public static function update_product_variants($variant){
		
		// $variation = kkart_get_product($variant['variation_id']);
		// self::set_variant($variation,$variant);
		// $variation_id = $variation->save(); 
	// }
	
	
	/**
	 * AJAX to sets all the variants details
	 **/
	public static function set_variant_data(){
		check_ajax_referer( 'kkart_editor_nonce', 'kkart_nonce' );

		$variation_id = kkart_clean( isset($_POST['variation_id'])) ? wp_unslash( $_POST['variation_id'] ) : '';
		$form_data = kkart_clean( isset($_POST['form_data'])) ? wp_unslash( $_POST['form_data'] ) : '';
		$variation = kkart_get_product($variation_id);
		
		
		foreach($form_data as $field){
			
			switch($field['name']){
			
				case 'image_id' :
					$variation->set_image_id($field['value']);
					break;
			
				case 'sku' : 
					$variation->set_sku($field['value']);
					break;
					
				case 'enabled' :
					$variation->set_status($field['value'] == 'on' ? 'publish' : 'private');
					break;
					
				case 'virtual' : 
					$variation->set_virtual(($field['value'] == 'on') ? 1 : 0);
					break;
					
				case 'downloadable' : 
					$variation->set_downloadable(($field['value'] == 'on') ? 1 : 0);
					break;

				case 'manage_stock' : 
					$variation->set_manage_stock(($field['value'] == 'on') ? 1 : 0);	
					break;
				
				case 'regular_price' : 
					$variation->set_regular_price(abs($field['value']) != 0 ? abs($field['value']) : '');
					break;
				
				case 'sale_price' : 
					$variation->set_sale_price(abs($field['value']) != 0 ? abs($field['value']) : '');
					break;

				case 'sale_start_date' :
					$variation->set_date_on_sale_from($field['value']);
					break;
				
				case 'sale_end_date' : 
					$variation->set_date_on_sale_to($field['value']);
					break;
					
				case 'stock_status' : 
					$variation->set_stock_status($field['value']);
					break;
					
				case 'stock_quantity' : 
					$variation->set_stock_quantity(absint($field['value']));
					break;
				
				case 'weight' : 
					$variation->set_weight(abs($field['value']));
					break;
					
				case 'length' : 
					$variation->set_length(abs($field['value']));
					break;
					
				case 'width' : 
					$variation->set_width(abs($field['value']));
					break;
					
				case 'height' : 
					$variation->set_height(abs($field['value']));
					break;
					
				case 'shipping_class' : 
					$variation->set_shipping_class_id(absint($field['value']));
					break;
					
				case 'description' : 
					$variation->set_description($field['value']);
					break;
					
				case 'download_file_data' : 
					$variation->set_downloads($field['value']);
			}
		}
		$variation->save();
		
		wp_send_json('Success');
	
	}
	// check for security end
	
	public static function get_attribute_taxonomy(){
		
		$attribute_tax = kkart_get_attribute_taxonomies();
		$attribute_tax_name  = array_values(kkart_get_attribute_taxonomy_labels());
		$terms = self::get_attribute_terms($attribute_tax_name);
		
		$attribute_data = array(
			'attribute_tax_name' => $attribute_tax_name,
			'attribute_terms' => $terms
		);
		
		return $attribute_data;
	}
	
	//fetches attribute taxonmy terms
	public static function get_attribute_terms($attribute_tax_name){
		
		$terms = [];
		
		foreach($attribute_tax_name as $attribute_name){
			$attribute_name = 'pa_'.strtolower($attribute_name);

			array_push($terms, get_terms(array(
				'taxonomy' => $attribute_name,
				'hide_empty' => false
			)));
		}
		
		return $terms;
	}
	
	/**
	 * AJAX to delete a single variant at a time
	 **/
	public static function delete_variant(){
		check_ajax_referer( 'kkart_editor_nonce', 'kkart_nonce' );
	
		$variant_id = kkart_clean( isset($_POST['variant_id']) ) ? wp_unslash( $_POST['variant_id'] ) : false;
		
		$variation = kkart_get_product($variant_id);
		$variation->delete();
	}
	
	/**
	 * AJAX to delete all variants at a time
	 **/
	public static function variation_bulk_action_delete_all_variations($variation_ids, $data){
		
		foreach($variation_ids as $variation_id){
			$variation = kkart_get_product($variation_id);
			$product_id = $variation->get_parent_id();
			$variation->delete();
		}
		delete_post_meta($product_id,'_product_attributes');
	}
	
	/**
	 * AJAX remove from cart.
	 */
	public static function remove_from_cart() {
		ob_start();

		// phpcs:ignore WordPress.Security.NonceVerification.Missing
		$cart_item_key = kkart_clean( isset( $_POST['cart_item_key'] ) ? wp_unslash( $_POST['cart_item_key'] ) : '' );

		if ( $cart_item_key && false !== KKART()->cart->remove_cart_item( $cart_item_key ) ) {
			wp_send_json(self::cart_update_price_details());
		} else {
			wp_send_json_error();
		}
	}
	
	// Save checkout address handler
	public static function save_billing_address(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$done = array();
		$data = $_REQUEST;
		$address_id = '';
		
		if(! is_user_logged_in()){
			$done['error'] = __('Please login and try again!');
			wp_send_json($done);
		}
		
		if(!empty($_REQUEST['address_id']) ){
			$address_id = $_REQUEST['address_id'];
		}else{
			$address_id = 'addr_'.rand(1000, 9999);
		}
		
		// Update user Address
		$ret = kkart_update_user_address($address_id, $data);
		
		if($ret['error']){
			$done['postal_error'] = $ret['error'];
			echo json_encode($done);
			wp_die();
		}
		
		if(empty($ret)){
			$done['error'] = 'The updated data not fond, Some thing wrong';
			echo json_encode($done);
			wp_die();
		}
		
		$done['success'] = 'true';
		$done['address_id'] = $address_id;
		$done['address_data'] = $ret;
		$done['address_data']['address_id'] = $address_id;
		echo json_encode($done);
		wp_die();
	}
	
	// Delete checkout address handler
	public static function delete_address(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$done = array();
		
		if(! is_user_logged_in()){
			$done['error'] = __('Please login and try again!');
			wp_send_json($done);
		}
		
		if(empty($_REQUEST['address_id'])){
			$done['error'] = __('Address ID not found');
			wp_send_json($done);
		}
		
		$ret = kkart_delete_user_address($_REQUEST['address_id']);
		
		if(empty($ret)){
			$done['error'] = 'Unable to delete address for some reason! Please contact to Shop author!';
			echo json_encode($done);
			wp_die();
		}
		
		$done['success'] = 'true';
		$done['address_id'] = $address_id;
		echo json_encode($done);
		wp_die();
	}
	
	// Get checkout address handler
	public static function get_address_details(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$done = array();
		
		if(! is_user_logged_in()){
			$done['error'] = __('Please login and try again!');
			wp_send_json($done);
		}
		
		$user_id = get_current_user_id();
		$ret = kkart_get_user_address();
		
		if(empty($ret)){
			$done['error'] = 'Unable to get address for some reason! Please contact to Shop author!';
			echo json_encode($done);
			wp_die();
		}
		
		$done['address_data'] = $ret;

		if(!empty($_REQUEST['address_id'])){
			if(!isset($ret[$_REQUEST['address_id']])){
				$done['error'] = __('Address ID not found');
				echo json_encode($done);
				wp_die();
			}
			
			$ret = $ret[$_REQUEST['address_id']];
		}
		
		$prefix = 'billing_';
		
		if(isset($_REQUEST['is_shipping']) && $_REQUEST['is_shipping'] == 'true'){
			$prefix = 'shipping_';
		}
		
		// Update user address ID
		$active_id = get_user_meta( $user_id, $prefix.'address_id', true);
		
		$done['success'] = 'true';
		$done['address_data'] = $ret;
		$done['active_addr_id'] = $active_id;
		echo json_encode($done);
		wp_die();
	}
	
	// Set billing address handler
	public static function set_billing_address(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$done = array();
		
		if(! is_user_logged_in()){
			$done['error'] = __('Please login and try again!');
			wp_send_json($done);
		}
		
		if(empty($_REQUEST['address_id'])){
			$done['error'] = __('Address ID not found');
			wp_send_json($done);
		}
		
		$user_id = get_current_user_id();
		$ret = kkart_get_user_address($_REQUEST['address_id']);
		$prefix = 'billing_';
		
		if(empty($ret)){
			$done['error'] = 'Unable to Set address for some reason! Please contact to Shop author!';
			echo json_encode($done);
			wp_die();
		}
		
		if($_REQUEST['is_shipping'] == 'true'){
			$prefix = 'shipping_';
		}
		
		foreach($ret as $key => $value){
			$key = substr($key, 8);
			update_user_meta( $user_id, $prefix.$key, $value);
		}
		
		// Update user address ID
		update_user_meta( $user_id, $prefix.'address_id', $_REQUEST['address_id']);
		
		$done['success'] = 'true';
		$done['address_data'] = $ret;
		echo json_encode($done);
		wp_die();
	}
	
	public static function reload_cart_tab() {
		
		// Some AJAX Security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		KKART()->cart->calculate_totals();
		$cart_tab_html = kkart_checkout_cart();
		wp_send_json( $cart_tab_html );
	}
	
	// Checkout procceed handler
	public static function checkout_tabs_procceed(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$done = array();
		$tab_type = @$_REQUEST['tab_type'];
		
		if(empty($tab_type)){
			$done['error'] = __('Please provide valid tab type!');
			echo json_encode($done);
			wp_die();
		}
		
		switch($tab_type){
			case 'login':
			
				if(!is_user_logged_in()){
					$done['logged_out'] = __('Please login and try again!');
				}
				
				if(is_user_logged_in()){
					$user_data = get_userdata(get_current_user_id());

					$done['login_auth'] = array(
						'isLoggedIn' => is_user_logged_in(),
						'display_name' => $user_data->data->display_name,
						'user_email' => $user_data->data->user_email
					);
				}
		
				break;
			case 'billing':
			
				$addresses = kkart_get_user_address();	
				$user_id = get_current_user_id();
				$active_addr_id = get_user_meta($user_id, 'billing_address_id', true);
				
				if(!is_user_logged_in()){
					$done['logged_out'] = __('Please login and try again!');
				}
				
				if(!array_key_exists($active_addr_id, $addresses)){
					$done['error'] = __('Please Set the valid address for the billing!');
				}
				
				break;
			case 'shipping':
			
				$addresses = kkart_get_user_address();	
				$user_id = get_current_user_id();
				$active_addr_id = get_user_meta($user_id, 'shipping_address_id', true);

				if(!is_user_logged_in()){
					$done['logged_out'] = __('Pleaselease login and try again!');
				}
				
				// Skip error if not set differrent address
				if(!array_key_exists($active_addr_id, $addresses) && empty($_REQUEST['ship_to_billing_address'])){
					$done['error'] = __('Please Set the valid address for the shipping!');
				}
				
				break;
			case 'cart':
				// TODO: if any cart related validations
				if(!is_user_logged_in()){
					$done['logged_out'] = __('Pleaselease login and try again!');
				}
				
				if ( KKART()->cart->is_empty() ) {
					$done['error'] = __('Unable to procceed Due to empty cart!');
				}
				
				break;
			case 'payment':
			
				if(!is_user_logged_in()){
					$done['logged_out'] = __('Please login and try again!');
					break;
				}
				
				kkart_maybe_define_constant( 'KKART_CHECKOUT', true );
				KKART()->checkout()->process_checkout();
				break;
		}
		
		echo json_encode($done);
		wp_die();
	}
	
	/**
	 * Process ajax checkout form.
	 */
	public static function checkout() {
		kkart_maybe_define_constant( 'KKART_CHECKOUT', true );
		KKART()->checkout()->process_checkout();
		wp_die( 0 );
	}

	/**
	 * Get a matching variation based on posted attributes.
	 */
	public static function get_variation() {
		ob_start();

		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( empty( $_POST['product_id'] ) ) {
			wp_die();
		}

		$variable_product = kkart_get_product( absint( $_POST['product_id'] ) );

		if ( ! $variable_product ) {
			wp_die();
		}

		$data_store   = KKART_Data_Store::load( 'product' );
		$variation_id = $data_store->find_matching_product_variation( $variable_product, wp_unslash( $_POST ) );
		$variation    = $variation_id ? $variable_product->get_available_variation( $variation_id ) : false;
		wp_send_json( $variation );
		// phpcs:enable
	}

	/**
	 * Locate user via AJAX.
	 */
	public static function get_customer_location() {
		$location_hash = KKART_Cache_Helper::geolocation_ajax_get_location_hash();
		wp_send_json_success( array( 'hash' => $location_hash ) );
	}

	/**
	 * Toggle Featured status of a product from admin.
	 */
	public static function feature_product() {
		if ( current_user_can( 'edit_products' ) && check_admin_referer( 'kkart-feature-product' ) && isset( $_GET['product_id'] ) ) {
			$product = kkart_get_product( absint( $_GET['product_id'] ) );

			if ( $product ) {
				$product->set_featured( ! $product->get_featured() );
				$product->save();
			}
		}

		wp_safe_redirect( wp_get_referer() ? remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'ids' ), wp_get_referer() ) : admin_url( 'edit.php?post_type=product' ) );
		exit;
	}

	/**
	 * Mark an order with a status.
	 */
	public static function mark_order_status() {
		if ( current_user_can( 'edit_shop_orders' ) && check_admin_referer( 'kkart-mark-order-status' ) && isset( $_GET['status'], $_GET['order_id'] ) ) {
			$status = sanitize_text_field( wp_unslash( $_GET['status'] ) );
			$order  = kkart_get_order( absint( wp_unslash( $_GET['order_id'] ) ) );

			if ( kkart_is_order_status( 'kkart-' . $status ) && $order ) {
				// Initialize payment gateways in case order has hooked status transition actions.
				KKART()->payment_gateways();

				$order->update_status( $status, '', true );
				do_action( 'kkart_order_edit_status', $order->get_id(), $status );
			}
		}

		wp_safe_redirect( wp_get_referer() ? wp_get_referer() : admin_url( 'edit.php?post_type=shop_order' ) );
		exit;
	}

	/**
	 * Get order details.
	 */
	public static function get_order_details() {
		check_admin_referer( 'kkart-preview-order', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_GET['order_id'] ) ) {
			wp_die( -1 );
		}

		$order = kkart_get_order( absint( $_GET['order_id'] ) );

		if ( $order ) {
			include_once __DIR__ . '/admin/list-tables/class-kkart-admin-list-table-orders.php';

			wp_send_json_success( KKART_Admin_List_Table_Orders::order_preview_get_order_details( $order ) );
		}
		wp_die();
	}

	/**
	 * Add an attribute row.
	 */
	public static function add_attribute() {
		ob_start();

		check_ajax_referer( 'add-attribute', 'security' );

		if ( ! current_user_can( 'edit_products' ) || ! isset( $_POST['taxonomy'], $_POST['i'] ) ) {
			wp_die( -1 );
		}

		$i             = absint( $_POST['i'] );
		$metabox_class = array();
		$attribute     = new KKART_Product_Attribute();

		$attribute->set_id( kkart_attribute_taxonomy_id_by_name( sanitize_text_field( wp_unslash( $_POST['taxonomy'] ) ) ) );
		$attribute->set_name( sanitize_text_field( wp_unslash( $_POST['taxonomy'] ) ) );
		$attribute->set_visible( apply_filters( 'kkart_attribute_default_visibility', 1 ) );
		$attribute->set_variation( apply_filters( 'kkart_attribute_default_is_variation', 0 ) );

		if ( $attribute->is_taxonomy() ) {
			$metabox_class[] = 'taxonomy';
			$metabox_class[] = $attribute->get_name();
		}

		include __DIR__ . '/admin/meta-boxes/views/html-product-attribute.php';
		wp_die();
	}

	/**
	 * Add a new attribute via ajax function.
	 */
	public static function add_new_attribute() {
		check_ajax_referer( 'add-attribute', 'security' );

		if ( current_user_can( 'manage_product_terms' ) && isset( $_POST['taxonomy'], $_POST['term'] ) ) {
			$taxonomy = esc_attr( wp_unslash( $_POST['taxonomy'] ) ); // phpcs:ignore
			$term     = kkart_clean( wp_unslash( $_POST['term'] ) );

			if ( taxonomy_exists( $taxonomy ) ) {

				$result = wp_insert_term( $term, $taxonomy );

				if ( is_wp_error( $result ) ) {
					wp_send_json(
						array(
							'error' => $result->get_error_message(),
						)
					);
				} else {
					$term = get_term_by( 'id', $result['term_id'], $taxonomy );
					wp_send_json(
						array(
							'term_id' => $term->term_id,
							'name'    => $term->name,
							'slug'    => $term->slug,
						)
					);
				}
			}
		}
		wp_die( -1 );
	}

	/**
	 * Delete variations via ajax function.
	 */
	public static function remove_variations() {
		check_ajax_referer( 'delete-variations', 'security' );

		if ( current_user_can( 'edit_products' ) && isset( $_POST['variation_ids'] ) ) {
			$variation_ids = array_map( 'absint', (array) wp_unslash( $_POST['variation_ids'] ) );

			foreach ( $variation_ids as $variation_id ) {
				if ( 'product_variation' === get_post_type( $variation_id ) ) {
					$variation = kkart_get_product( $variation_id );
					$variation->delete( true );
				}
			}
		}

		wp_die( -1 );
	}

	/**
	 * Save attributes via ajax.
	 */
	public static function save_attributes() {
		check_ajax_referer( 'save-attributes', 'security' );

		if ( ! current_user_can( 'edit_products' ) || ! isset( $_POST['data'], $_POST['post_id'] ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			parse_str( wp_unslash( $_POST['data'] ), $data ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

			$attributes   = KKART_Meta_Box_Product_Data::prepare_attributes( $data );
			$product_id   = absint( wp_unslash( $_POST['post_id'] ) );
			$product_type = ! empty( $_POST['product_type'] ) ? kkart_clean( wp_unslash( $_POST['product_type'] ) ) : 'simple';
			$classname    = KKART_Product_Factory::get_product_classname( $product_id, $product_type );
			$product      = new $classname( $product_id );

			$product->set_attributes( $attributes );
			$product->save();

			ob_start();
			$attributes = $product->get_attributes( 'edit' );
			$i          = -1;
			if ( ! empty( $data['attribute_names'] ) ) {
				foreach ( $data['attribute_names'] as $attribute_name ) {
					$attribute = isset( $attributes[ sanitize_title( $attribute_name ) ] ) ? $attributes[ sanitize_title( $attribute_name ) ] : false;
					if ( ! $attribute ) {
						continue;
					}
					$i++;
					$metabox_class = array();

					if ( $attribute->is_taxonomy() ) {
						$metabox_class[] = 'taxonomy';
						$metabox_class[] = $attribute->get_name();
					}

					include __DIR__ . '/admin/meta-boxes/views/html-product-attribute.php';
				}
			}

			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Add variation via ajax function.
	 */
	public static function add_variation() {
		check_ajax_referer( 'add-variation', 'security' );

		if ( ! current_user_can( 'edit_products' ) || ! isset( $_POST['post_id'], $_POST['loop'] ) ) {
			wp_die( -1 );
		}

		global $post; // Set $post global so its available, like within the admin screens.

		$product_id       = intval( $_POST['post_id'] );
		$post             = get_post( $product_id ); // phpcs:ignore
		$loop             = intval( $_POST['loop'] );
		$product_object   = kkart_get_product_object( 'variable', $product_id ); // Forces type to variable in case product is unsaved.
		$variation_object = kkart_get_product_object( 'variation' );
		$variation_object->set_parent_id( $product_id );
		$variation_object->set_attributes( array_fill_keys( array_map( 'sanitize_title', array_keys( $product_object->get_variation_attributes() ) ), '' ) );
		$variation_id   = $variation_object->save();
		$variation      = get_post( $variation_id );
		$variation_data = array_merge( get_post_custom( $variation_id ), kkart_get_product_variation_attributes( $variation_id ) ); // kept for BW compatibility.
		include __DIR__ . '/admin/meta-boxes/views/html-variation-admin.php';
		wp_die();
	}

	/**
	 * Link all variations via ajax function.
	 */
	public static function link_all_variations() {
		check_ajax_referer( 'link-variations', 'security' );

		if ( ! current_user_can( 'edit_products' ) ) {
			wp_die( -1 );
		}

		kkart_maybe_define_constant( 'KKART_MAX_LINKED_VARIATIONS', 50 );
		kkart_set_time_limit( 0 );

		$post_id = isset( $_POST['post_id'] ) ? intval( $_POST['post_id'] ) : 0;

		if ( ! $post_id ) {
			wp_die();
		}

		$product    = kkart_get_product( $post_id );
		$data_store = $product->get_data_store();

		if ( ! is_callable( array( $data_store, 'create_all_product_variations' ) ) ) {
			wp_die();
		}

		echo esc_html( $data_store->create_all_product_variations( $product, Constants::get_constant( 'KKART_MAX_LINKED_VARIATIONS' ) ) );

		$data_store->sort_all_product_variations( $product->get_id() );
		wp_die();
	}

	/**
	 * Delete download permissions via ajax function.
	 */
	public static function revoke_access_to_download() {
		check_ajax_referer( 'revoke-access', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['download_id'], $_POST['product_id'], $_POST['order_id'], $_POST['permission_id'] ) ) {
			wp_die( -1 );
		}
		$download_id   = kkart_clean( wp_unslash( $_POST['download_id'] ) );
		$product_id    = intval( $_POST['product_id'] );
		$order_id      = intval( $_POST['order_id'] );
		$permission_id = absint( $_POST['permission_id'] );
		$data_store    = KKART_Data_Store::load( 'customer-download' );
		$data_store->delete_by_id( $permission_id );

		do_action( 'kkart_ajax_revoke_access_to_product_download', $download_id, $product_id, $order_id, $permission_id );

		wp_die();
	}

	/**
	 * Grant download permissions via ajax function.
	 */
	public static function grant_access_to_download() {

		check_ajax_referer( 'grant-access', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['loop'], $_POST['order_id'], $_POST['product_ids'] ) ) {
			wp_die( -1 );
		}

		global $wpdb;

		$wpdb->hide_errors();

		$order_id     = intval( $_POST['order_id'] );
		$product_ids  = array_filter( array_map( 'absint', (array) wp_unslash( $_POST['product_ids'] ) ) );
		$loop         = intval( $_POST['loop'] );
		$file_counter = 0;
		$order        = kkart_get_order( $order_id );

		foreach ( $product_ids as $product_id ) {
			$product = kkart_get_product( $product_id );
			$files   = $product->get_downloads();

			if ( ! $order->get_billing_email() ) {
				wp_die();
			}

			if ( ! empty( $files ) ) {
				foreach ( $files as $download_id => $file ) {
					$inserted_id = kkart_downloadable_file_permission( $download_id, $product_id, $order );
					if ( $inserted_id ) {
						$download = new KKART_Customer_Download( $inserted_id );
						$loop ++;
						$file_counter ++;

						if ( $file->get_name() ) {
							$file_count = $file->get_name();
						} else {
							/* translators: %d file count */
							$file_count = sprintf( __( 'File %d', 'kkart' ), $file_counter );
						}
						include __DIR__ . '/admin/meta-boxes/views/html-order-download-permission.php';
					}
				}
			}
		}
		wp_die();
	}

	/**
	 * Get customer details via ajax.
	 */
	public static function get_customer_details() {
		check_ajax_referer( 'get-customer-details', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['user_id'] ) ) {
			wp_die( -1 );
		}

		$user_id  = absint( $_POST['user_id'] );
		$customer = new KKART_Customer( $user_id );

		if ( has_filter( 'kkart_found_customer_details' ) ) {
			kkart_deprecated_function( 'The kkart_found_customer_details filter', '3.0', 'kkart_ajax_get_customer_details' );
		}

		$data                  = $customer->get_data();
		$data['date_created']  = $data['date_created'] ? $data['date_created']->getTimestamp() : null;
		$data['date_modified'] = $data['date_modified'] ? $data['date_modified']->getTimestamp() : null;

		$customer_data = apply_filters( 'kkart_ajax_get_customer_details', $data, $customer, $user_id );
		wp_send_json( $customer_data );
	}

	/**
	 * Add order item via ajax. Used on the edit order screen in WP Admin.
	 *
	 * @throws Exception If order is invalid.
	 */
	public static function add_order_item() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		if ( ! isset( $_POST['order_id'] ) ) {
			throw new Exception( __( 'Invalid order', 'kkart' ) );
		}
		$order_id = absint( wp_unslash( $_POST['order_id'] ) );

		// If we passed through items it means we need to save first before adding a new one.
		$items = ( ! empty( $_POST['items'] ) ) ? wp_unslash( $_POST['items'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		$items_to_add = isset( $_POST['data'] ) ? array_filter( wp_unslash( (array) $_POST['data'] ) ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		try {
			$response = self::maybe_add_order_item( $order_id, $items, $items_to_add );
			wp_send_json_success( $response );
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}
	}

	/**
	 * Add order item via AJAX. This is refactored for better unit testing.
	 *
	 * @param int          $order_id     ID of order to add items to.
	 * @param string|array $items        Existing items in order. Empty string if no items to add.
	 * @param array        $items_to_add Array of items to add.
	 *
	 * @return array     Fragments to render and notes HTML.
	 * @throws Exception When unable to add item.
	 */
	private static function maybe_add_order_item( $order_id, $items, $items_to_add ) {
		try {
			$order = kkart_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			if ( ! empty( $items ) ) {
				$save_items = array();
				parse_str( $items, $save_items );
				kkart_save_order_items( $order->get_id(), $save_items );
			}

			// Add items to order.
			$order_notes = array();

			foreach ( $items_to_add as $item ) {
				if ( ! isset( $item['id'], $item['qty'] ) || empty( $item['id'] ) ) {
					continue;
				}
				$product_id = absint( $item['id'] );
				$qty        = kkart_stock_amount( $item['qty'] );
				$product    = kkart_get_product( $product_id );

				if ( ! $product ) {
					throw new Exception( __( 'Invalid product ID', 'kkart' ) . ' ' . $product_id );
				}
				if ( 'variable' === $product->get_type() ) {
					/* translators: %s product name */
					throw new Exception( sprintf( __( '%s is a variable product parent and cannot be added.', 'kkart' ), $product->get_name() ) );
				}
				$validation_error = new WP_Error();
				$validation_error = apply_filters( 'kkart_ajax_add_order_item_validation', $validation_error, $product, $order, $qty );

				if ( $validation_error->get_error_code() ) {
					/* translators: %s: error message */
					throw new Exception( sprintf( __( 'Error: %s', 'kkart' ), $validation_error->get_error_message() ) );
				}
				$item_id                 = $order->add_product( $product, $qty );
				$item                    = apply_filters( 'kkart_ajax_order_item', $order->get_item( $item_id ), $item_id, $order, $product );
				$added_items[ $item_id ] = $item;
				$order_notes[ $item_id ] = $product->get_formatted_name();

				// We do not perform any stock operations here because they will be handled when order is moved to a status where stock operations are applied (like processing, completed etc).

				do_action( 'kkart_ajax_add_order_item_meta', $item_id, $item, $order );
			}

			/* translators: %s item name. */
			$order->add_order_note( sprintf( __( 'Added line items: %s', 'kkart' ), implode( ', ', $order_notes ) ), false, true );

			do_action( 'kkart_ajax_order_items_added', $added_items, $order );

			$data = get_post_meta( $order_id );

			// Get HTML to return.
			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$items_html = ob_get_clean();

			ob_start();
			$notes = kkart_get_order_notes( array( 'order_id' => $order_id ) );
			include __DIR__ . '/admin/meta-boxes/views/html-order-notes.php';
			$notes_html = ob_get_clean();

			return array(
				'html'       => $items_html,
				'notes_html' => $notes_html,
			);
		} catch ( Exception $e ) {
			throw $e; // Forward exception to caller.
		}
	}

	/**
	 * Add order fee via ajax.
	 *
	 * @throws Exception If order is invalid.
	 */
	public static function add_order_fee() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order    = kkart_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			$amount = isset( $_POST['amount'] ) ? kkart_clean( wp_unslash( $_POST['amount'] ) ) : 0;

			$calculate_tax_args = array(
				'country'  => isset( $_POST['country'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['country'] ) ) ) : '',
				'state'    => isset( $_POST['state'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['state'] ) ) ) : '',
				'postcode' => isset( $_POST['postcode'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['postcode'] ) ) ) : '',
				'city'     => isset( $_POST['city'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['city'] ) ) ) : '',
			);

			if ( strstr( $amount, '%' ) ) {
				$formatted_amount = $amount;
				$percent          = floatval( trim( $amount, '%' ) );
				$amount           = $order->get_total() * ( $percent / 100 );
			} else {
				$amount           = floatval( $amount );
				$formatted_amount = kkart_price( $amount, array( 'currency' => $order->get_currency() ) );
			}

			$fee = new KKART_Order_Item_Fee();
			$fee->set_amount( $amount );
			$fee->set_total( $amount );
			/* translators: %s fee amount */
			$fee->set_name( sprintf( __( '%s fee', 'kkart' ), kkart_clean( $formatted_amount ) ) );

			$order->add_item( $fee );
			$order->calculate_taxes( $calculate_tax_args );
			$order->calculate_totals( false );
			$order->save();

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Add order shipping cost via ajax.
	 *
	 * @throws Exception If order is invalid.
	 */
	public static function add_order_shipping() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order    = kkart_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			$order_taxes      = $order->get_taxes();
			$shipping_methods = KKART()->shipping() ? KKART()->shipping()->load_shipping_methods() : array();

			// Add new shipping.
			$item = new KKART_Order_Item_Shipping();
			$item->set_shipping_rate( new KKART_Shipping_Rate() );
			$item->set_order_id( $order_id );
			$item_id = $item->save();

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-shipping.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Add order tax column via ajax.
	 *
	 * @throws Exception If order or tax rate is invalid.
	 */
	public static function add_order_tax() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order    = kkart_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			$rate_id = isset( $_POST['rate_id'] ) ? absint( $_POST['rate_id'] ) : '';

			if ( ! $rate_id ) {
				throw new Exception( __( 'Invalid rate', 'kkart' ) );
			}

			$data = get_post_meta( $order_id );

			// Add new tax.
			$item = new KKART_Order_Item_Tax();
			$item->set_rate( $rate_id );
			$item->set_order_id( $order_id );
			$item->save();

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Add order discount via ajax.
	 *
	 * @throws Exception If order or coupon is invalid.
	 */
	public static function add_coupon_discount() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id           = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order              = kkart_get_order( $order_id );
			$calculate_tax_args = array(
				'country'  => isset( $_POST['country'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['country'] ) ) ) : '',
				'state'    => isset( $_POST['state'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['state'] ) ) ) : '',
				'postcode' => isset( $_POST['postcode'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['postcode'] ) ) ) : '',
				'city'     => isset( $_POST['city'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['city'] ) ) ) : '',
			);

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			if ( empty( $_POST['coupon'] ) ) {
				throw new Exception( __( 'Invalid coupon', 'kkart' ) );
			}

			// Add user ID and/or email so validation for coupon limits works.
			$user_id_arg    = isset( $_POST['user_id'] ) ? absint( $_POST['user_id'] ) : 0;
			$user_email_arg = isset( $_POST['user_email'] ) ? sanitize_email( wp_unslash( $_POST['user_email'] ) ) : '';

			if ( $user_id_arg ) {
				$order->set_customer_id( $user_id_arg );
			}
			if ( $user_email_arg ) {
				$order->set_billing_email( $user_email_arg );
			}

			$result = $order->apply_coupon( kkart_format_coupon_code( wp_unslash( $_POST['coupon'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

			if ( is_wp_error( $result ) ) {
				throw new Exception( html_entity_decode( wp_strip_all_tags( $result->get_error_message() ) ) );
			}

			$order->calculate_taxes( $calculate_tax_args );
			$order->calculate_totals( false );

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Remove coupon from an order via ajax.
	 *
	 * @throws Exception If order or coupon is invalid.
	 */
	public static function remove_order_coupon() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id           = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
			$order              = kkart_get_order( $order_id );
			$calculate_tax_args = array(
				'country'  => isset( $_POST['country'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['country'] ) ) ) : '',
				'state'    => isset( $_POST['state'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['state'] ) ) ) : '',
				'postcode' => isset( $_POST['postcode'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['postcode'] ) ) ) : '',
				'city'     => isset( $_POST['city'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['city'] ) ) ) : '',
			);

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			if ( empty( $_POST['coupon'] ) ) {
				throw new Exception( __( 'Invalid coupon', 'kkart' ) );
			}

			$order->remove_coupon( kkart_format_coupon_code( wp_unslash( $_POST['coupon'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Missing, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$order->calculate_taxes( $calculate_tax_args );
			$order->calculate_totals( false );

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Remove an order item.
	 *
	 * @throws Exception If order is invalid.
	 */
	public static function remove_order_item() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['order_id'], $_POST['order_item_ids'] ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = absint( $_POST['order_id'] );
			$order    = kkart_get_order( $order_id );

			if ( ! $order ) {
				throw new Exception( __( 'Invalid order', 'kkart' ) );
			}

			if ( ! isset( $_POST['order_item_ids'] ) ) {
				throw new Exception( __( 'Invalid items', 'kkart' ) );
			}

			$order_item_ids     = wp_unslash( $_POST['order_item_ids'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$items              = ( ! empty( $_POST['items'] ) ) ? wp_unslash( $_POST['items'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$calculate_tax_args = array(
				'country'  => isset( $_POST['country'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['country'] ) ) ) : '',
				'state'    => isset( $_POST['state'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['state'] ) ) ) : '',
				'postcode' => isset( $_POST['postcode'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['postcode'] ) ) ) : '',
				'city'     => isset( $_POST['city'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['city'] ) ) ) : '',
			);

			if ( ! is_array( $order_item_ids ) && is_numeric( $order_item_ids ) ) {
				$order_item_ids = array( $order_item_ids );
			}

			// If we passed through items it means we need to save first before deleting.
			if ( ! empty( $items ) ) {
				$save_items = array();
				parse_str( $items, $save_items );
				kkart_save_order_items( $order->get_id(), $save_items );
			}

			if ( ! empty( $order_item_ids ) ) {
				$order_notes = array();

				foreach ( $order_item_ids as $item_id ) {
					$item_id = absint( $item_id );
					$item    = $order->get_item( $item_id );

					// Before deleting the item, adjust any stock values already reduced.
					if ( $item->is_type( 'line_item' ) ) {
						$changed_stock = kkart_maybe_adjust_line_item_product_stock( $item, 0 );

						if ( $changed_stock && ! is_wp_error( $changed_stock ) ) {
							/* translators: %1$s: item name %2$s: stock change */
							$order->add_order_note( sprintf( __( 'Deleted %1$s and adjusted stock (%2$s)', 'kkart' ), $item->get_name(), $changed_stock['from'] . '&rarr;' . $changed_stock['to'] ), false, true );
						} else {
							/* translators: %s item name. */
							$order->add_order_note( sprintf( __( 'Deleted %s', 'kkart' ), $item->get_name() ), false, true );
						}
					}

					kkart_delete_order_item( $item_id );
				}
			}

			$order = kkart_get_order( $order_id );
			$order->calculate_taxes( $calculate_tax_args );
			$order->calculate_totals( false );

			// Get HTML to return.
			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$items_html = ob_get_clean();

			ob_start();
			$notes = kkart_get_order_notes( array( 'order_id' => $order_id ) );
			include __DIR__ . '/admin/meta-boxes/views/html-order-notes.php';
			$notes_html = ob_get_clean();

			wp_send_json_success(
				array(
					'html'       => $items_html,
					'notes_html' => $notes_html,
				)
			);
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Remove an order tax.
	 *
	 * @throws Exception If there is an error whilst deleting the rate.
	 */
	public static function remove_order_tax() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['order_id'], $_POST['rate_id'] ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			$order_id = absint( $_POST['order_id'] );
			$rate_id  = absint( $_POST['rate_id'] );

			$order = kkart_get_order( $order_id );
			if ( ! $order->is_editable() ) {
				throw new Exception( __( 'Order not editable', 'kkart' ) );
			}

			kkart_delete_order_item( $rate_id );

			// Need to load order again after deleting to have latest items before calculating.
			$order = kkart_get_order( $order_id );
			$order->calculate_totals( false );

			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$response['html'] = ob_get_clean();
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Calc line tax.
	 */
	public static function calc_line_taxes() {
		check_ajax_referer( 'calc-totals', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['order_id'], $_POST['items'] ) ) {
			wp_die( -1 );
		}

		$order_id           = absint( $_POST['order_id'] );
		$calculate_tax_args = array(
			'country'  => isset( $_POST['country'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['country'] ) ) ) : '',
			'state'    => isset( $_POST['state'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['state'] ) ) ) : '',
			'postcode' => isset( $_POST['postcode'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['postcode'] ) ) ) : '',
			'city'     => isset( $_POST['city'] ) ? kkart_strtoupper( kkart_clean( wp_unslash( $_POST['city'] ) ) ) : '',
		);

		// Parse the jQuery serialized items.
		$items = array();
		parse_str( wp_unslash( $_POST['items'] ), $items ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		// Save order items first.
		kkart_save_order_items( $order_id, $items );

		// Grab the order and recalculate taxes.
		$order = kkart_get_order( $order_id );
		$order->calculate_taxes( $calculate_tax_args );
		$order->calculate_totals( false );
		include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
		wp_die();
	}

	/**
	 * Save order items via ajax.
	 */
	public static function save_order_items() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['order_id'], $_POST['items'] ) ) {
			wp_die( -1 );
		}

		if ( isset( $_POST['order_id'], $_POST['items'] ) ) {
			$order_id = absint( $_POST['order_id'] );

			// Parse the jQuery serialized items.
			$items = array();
			parse_str( wp_unslash( $_POST['items'] ), $items ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

			// Save order items.
			kkart_save_order_items( $order_id, $items );

			// Return HTML items.
			$order = kkart_get_order( $order_id );

			// Get HTML to return.
			ob_start();
			include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
			$items_html = ob_get_clean();

			ob_start();
			$notes = kkart_get_order_notes( array( 'order_id' => $order_id ) );
			include __DIR__ . '/admin/meta-boxes/views/html-order-notes.php';
			$notes_html = ob_get_clean();

			wp_send_json_success(
				array(
					'html'       => $items_html,
					'notes_html' => $notes_html,
				)
			);
		}
		wp_die();
	}

	/**
	 * Load order items via ajax.
	 */
	public static function load_order_items() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['order_id'] ) ) {
			wp_die( -1 );
		}

		// Return HTML items.
		$order_id = absint( $_POST['order_id'] );
		$order    = kkart_get_order( $order_id );
		include __DIR__ . '/admin/meta-boxes/views/html-order-items.php';
		wp_die();
	}

	/**
	 * Add order note via ajax.
	 */
	public static function add_order_note() {
		check_ajax_referer( 'add-order-note', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['post_id'], $_POST['note'], $_POST['note_type'] ) ) {
			wp_die( -1 );
		}

		$post_id   = absint( $_POST['post_id'] );
		$note      = wp_kses_post( trim( wp_unslash( $_POST['note'] ) ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$note_type = kkart_clean( wp_unslash( $_POST['note_type'] ) );

		$is_customer_note = ( 'customer' === $note_type ) ? 1 : 0;

		if ( $post_id > 0 ) {
			$order      = kkart_get_order( $post_id );
			$comment_id = $order->add_order_note( $note, $is_customer_note, true );
			$note       = kkart_get_order_note( $comment_id );

			$note_classes   = array( 'note' );
			$note_classes[] = $is_customer_note ? 'customer-note' : '';
			$note_classes   = apply_filters( 'kkart_order_note_class', array_filter( $note_classes ), $note );
			?>
			<li rel="<?php echo absint( $note->id ); ?>" class="<?php echo esc_attr( implode( ' ', $note_classes ) ); ?>">
				<div class="note_content">
					<?php echo wp_kses_post( wpautop( wptexturize( make_clickable( $note->content ) ) ) ); ?>
				</div>
				<p class="meta">
					<abbr class="exact-date" title="<?php echo esc_attr( $note->date_created->date( 'y-m-d h:i:s' ) ); ?>">
						<?php
						/* translators: $1: Date created, $2 Time created */
						printf( esc_html__( 'added on %1$s at %2$s', 'kkart' ), esc_html( $note->date_created->date_i18n( kkart_date_format() ) ), esc_html( $note->date_created->date_i18n( kkart_time_format() ) ) );
						?>
					</abbr>
					<?php
					if ( 'system' !== $note->added_by ) :
						/* translators: %s: note author */
						printf( ' ' . esc_html__( 'by %s', 'kkart' ), esc_html( $note->added_by ) );
					endif;
					?>
					<a href="#" class="delete_note" role="button"><?php esc_html_e( 'Delete note', 'kkart' ); ?></a>
				</p>
			</li>
			<?php
		}
		wp_die();
	}

	/**
	 * Delete order note via ajax.
	 */
	public static function delete_order_note() {
		check_ajax_referer( 'delete-order-note', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['note_id'] ) ) {
			wp_die( -1 );
		}

		$note_id = (int) $_POST['note_id'];

		if ( $note_id > 0 ) {
			kkart_delete_order_note( $note_id );
		}
		wp_die();
	}

	/**
	 * Search for products and echo json.
	 *
	 * @param string $term (default: '') Term to search for.
	 * @param bool   $include_variations in search or not.
	 */
	public static function json_search_products( $term = '', $include_variations = false ) {
		check_ajax_referer( 'search-products', 'security' );

		if ( empty( $term ) && isset( $_GET['term'] ) ) {
			$term = (string) kkart_clean( wp_unslash( $_GET['term'] ) );
		}

		if ( empty( $term ) ) {
			wp_die();
		}

		if ( ! empty( $_GET['limit'] ) ) {
			$limit = absint( $_GET['limit'] );
		} else {
			$limit = absint( apply_filters( 'kkart_json_search_limit', 30 ) );
		}

		$include_ids = ! empty( $_GET['include'] ) ? array_map( 'absint', (array) wp_unslash( $_GET['include'] ) ) : array();
		$exclude_ids = ! empty( $_GET['exclude'] ) ? array_map( 'absint', (array) wp_unslash( $_GET['exclude'] ) ) : array();

		$exclude_types = array();
		if ( ! empty( $_GET['exclude_type'] ) ) {
			// Support both comma-delimited and array format inputs.
			$exclude_types = wp_unslash( $_GET['exclude_type'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			if ( ! is_array( $exclude_types ) ) {
				$exclude_types = explode( ',', $exclude_types );
			}

			// Sanitize the excluded types against valid product types.
			foreach ( $exclude_types as &$exclude_type ) {
				$exclude_type = strtolower( trim( $exclude_type ) );
			}
			$exclude_types = array_intersect(
				array_merge( array( 'variation' ), array_keys( kkart_get_product_types() ) ),
				$exclude_types
			);
		}

		$data_store = KKART_Data_Store::load( 'product' );
		$ids        = $data_store->search_products( $term, '', (bool) $include_variations, false, $limit, $include_ids, $exclude_ids );

		$products = array();

		foreach ( $ids as $id ) {
			$product_object = kkart_get_product( $id );

			if ( ! kkart_products_array_filter_readable( $product_object ) ) {
				continue;
			}

			$formatted_name = $product_object->get_formatted_name();
			$managing_stock = $product_object->managing_stock();

			if ( in_array( $product_object->get_type(), $exclude_types, true ) ) {
				continue;
			}

			if ( $managing_stock && ! empty( $_GET['display_stock'] ) ) {
				$stock_amount = $product_object->get_stock_quantity();
				/* Translators: %d stock amount */
				$formatted_name .= ' &ndash; ' . sprintf( __( 'Stock: %d', 'kkart' ), kkart_format_stock_quantity_for_display( $stock_amount, $product_object ) );
			}

			$products[ $product_object->get_id() ] = rawurldecode( wp_strip_all_tags($formatted_name) );
		}

		wp_send_json( apply_filters( 'kkart_json_search_found_products', $products ) );
	}

	/**
	 * Search for product variations and return json.
	 *
	 * @see KKART_AJAX::json_search_products()
	 */
	public static function json_search_products_and_variations() {
		self::json_search_products( '', true );
	}

	/**
	 * Search for downloadable product variations and return json.
	 *
	 * @see KKART_AJAX::json_search_products()
	 */
	public static function json_search_downloadable_products_and_variations() {
		check_ajax_referer( 'search-products', 'security' );

		if ( ! empty( $_GET['limit'] ) ) {
			$limit = absint( $_GET['limit'] );
		} else {
			$limit = absint( apply_filters( 'kkart_json_search_limit', 30 ) );
		}

		$include_ids = ! empty( $_GET['include'] ) ? array_map( 'absint', (array) wp_unslash( $_GET['include'] ) ) : array();
		$exclude_ids = ! empty( $_GET['exclude'] ) ? array_map( 'absint', (array) wp_unslash( $_GET['exclude'] ) ) : array();

		$term       = isset( $_GET['term'] ) ? (string) kkart_clean( wp_unslash( $_GET['term'] ) ) : '';
		$data_store = KKART_Data_Store::load( 'product' );
		$ids        = $data_store->search_products( $term, 'downloadable', true, false, $limit );

		$product_objects = array_filter( array_map( 'kkart_get_product', $ids ), 'kkart_products_array_filter_readable' );
		$products        = array();

		foreach ( $product_objects as $product_object ) {
			$products[ $product_object->get_id() ] = rawurldecode( $product_object->get_formatted_name() );
		}

		wp_send_json( $products );
	}

	/**
	 * Search for customers and return json.
	 */
	public static function json_search_customers() {
		ob_start();

		check_ajax_referer( 'search-customers', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$term  = isset( $_GET['term'] ) ? (string) kkart_clean( wp_unslash( $_GET['term'] ) ) : '';
		$limit = 0;

		if ( empty( $term ) ) {
			wp_die();
		}

		$ids = array();
		// Search by ID.
		if ( is_numeric( $term ) ) {
			$customer = new KKART_Customer( intval( $term ) );

			// Customer does not exists.
			if ( 0 !== $customer->get_id() ) {
				$ids = array( $customer->get_id() );
			}
		}

		// Usernames can be numeric so we first check that no users was found by ID before searching for numeric username, this prevents performance issues with ID lookups.
		if ( empty( $ids ) ) {
			$data_store = KKART_Data_Store::load( 'customer' );

			// If search is smaller than 3 characters, limit result set to avoid
			// too many rows being returned.
			if ( 3 > strlen( $term ) ) {
				$limit = 20;
			}
			$ids = $data_store->search_customers( $term, $limit );
		}

		$found_customers = array();

		if ( ! empty( $_GET['exclude'] ) ) {
			$ids = array_diff( $ids, array_map( 'absint', (array) wp_unslash( $_GET['exclude'] ) ) );
		}

		foreach ( $ids as $id ) {
			$customer = new KKART_Customer( $id );
			/* translators: 1: user display name 2: user ID 3: user email */
			$found_customers[ $id ] = sprintf(
				/* translators: $1: customer name, $2 customer id, $3: customer email */
				esc_html__( '%1$s (#%2$s &ndash; %3$s)', 'kkart' ),
				$customer->get_first_name() . ' ' . $customer->get_last_name(),
				$customer->get_id(),
				$customer->get_email()
			);
		}

		wp_send_json( apply_filters( 'kkart_json_search_found_customers', $found_customers ) );
	}

	/**
	 * Search for categories and return json.
	 */
	public static function json_search_categories() {
		ob_start();

		check_ajax_referer( 'search-categories', 'security' );

		if ( ! current_user_can( 'edit_products' ) ) {
			wp_die( -1 );
		}

		$search_text = isset( $_GET['term'] ) ? kkart_clean( wp_unslash( $_GET['term'] ) ) : '';

		if ( ! $search_text ) {
			wp_die();
		}

		$found_categories = array();
		$args             = array(
			'taxonomy'   => array( 'product_cat' ),
			'orderby'    => 'id',
			'order'      => 'ASC',
			'hide_empty' => true,
			'fields'     => 'all',
			'name__like' => $search_text,
		);

		$terms = get_terms( $args );

		if ( $terms ) {
			foreach ( $terms as $term ) {
				$term->formatted_name = '';

				if ( $term->parent ) {
					$ancestors = array_reverse( get_ancestors( $term->term_id, 'product_cat' ) );
					foreach ( $ancestors as $ancestor ) {
						$ancestor_term = get_term( $ancestor, 'product_cat' );
						if ( $ancestor_term ) {
							$term->formatted_name .= $ancestor_term->name . ' > ';
						}
					}
				}

				$term->formatted_name              .= $term->name . ' (' . $term->count . ')';
				$found_categories[ $term->term_id ] = $term;
			}
		}

		wp_send_json( apply_filters( 'kkart_json_search_found_categories', $found_categories ) );
	}

	/**
	 * Ajax request handling for categories ordering.
	 */
	public static function term_ordering() {
		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( ! current_user_can( 'edit_products' ) || empty( $_POST['id'] ) ) {
			wp_die( -1 );
		}

		$id       = (int) $_POST['id'];
		$next_id  = isset( $_POST['nextid'] ) && (int) $_POST['nextid'] ? (int) $_POST['nextid'] : null;
		$taxonomy = isset( $_POST['thetaxonomy'] ) ? esc_attr( wp_unslash( $_POST['thetaxonomy'] ) ) : null; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$term     = get_term_by( 'id', $id, $taxonomy );

		if ( ! $id || ! $term || ! $taxonomy ) {
			wp_die( 0 );
		}

		kkart_reorder_terms( $term, $next_id, $taxonomy );

		$children = get_terms( $taxonomy, "child_of=$id&menu_order=ASC&hide_empty=0" );

		if ( $term && count( $children ) ) {
			echo 'children';
			wp_die();
		}
		// phpcs:enable
	}

	/**
	 * Ajax request handling for product ordering.
	 *
	 * Based on Simple Page Ordering by 10up (https://wordpress.org/plugins/simple-page-ordering/).
	 */
	public static function product_ordering() {
		global $wpdb;

		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( ! current_user_can( 'edit_products' ) || empty( $_POST['id'] ) ) {
			wp_die( -1 );
		}

		$sorting_id  = absint( $_POST['id'] );
		$previd      = absint( isset( $_POST['previd'] ) ? $_POST['previd'] : 0 );
		$nextid      = absint( isset( $_POST['nextid'] ) ? $_POST['nextid'] : 0 );
		$menu_orders = wp_list_pluck( $wpdb->get_results( "SELECT ID, menu_order FROM {$wpdb->posts} WHERE post_type = 'product' ORDER BY menu_order ASC, post_title ASC" ), 'menu_order', 'ID' );
		$index       = 0;

		foreach ( $menu_orders as $id => $menu_order ) {
			$id = absint( $id );

			if ( $sorting_id === $id ) {
				continue;
			}
			if ( $nextid === $id ) {
				$index ++;
			}
			$index ++;
			$menu_orders[ $id ] = $index;
			$wpdb->update( $wpdb->posts, array( 'menu_order' => $index ), array( 'ID' => $id ) );

			/**
			 * When a single product has gotten it's ordering updated.
			 * $id The product ID
			 * $index The new menu order
			*/
			do_action( 'kkart_after_single_product_ordering', $id, $index );
		}

		if ( isset( $menu_orders[ $previd ] ) ) {
			$menu_orders[ $sorting_id ] = $menu_orders[ $previd ] + 1;
		} elseif ( isset( $menu_orders[ $nextid ] ) ) {
			$menu_orders[ $sorting_id ] = $menu_orders[ $nextid ] - 1;
		} else {
			$menu_orders[ $sorting_id ] = 0;
		}

		$wpdb->update( $wpdb->posts, array( 'menu_order' => $menu_orders[ $sorting_id ] ), array( 'ID' => $sorting_id ) );

		KKART_Post_Data::delete_product_query_transients();

		do_action( 'kkart_after_product_ordering', $sorting_id, $menu_orders );
		wp_send_json( $menu_orders );
		// phpcs:enable
	}

	/**
	 * Handle a refund via the edit order screen.
	 *
	 * @throws Exception To return errors.
	 */
	public static function refund_line_items() {
		ob_start();

		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) ) {
			wp_die( -1 );
		}

		$order_id               = isset( $_POST['order_id'] ) ? absint( $_POST['order_id'] ) : 0;
		$refund_amount          = isset( $_POST['refund_amount'] ) ? kkart_format_decimal( sanitize_text_field( wp_unslash( $_POST['refund_amount'] ) ), kkart_get_price_decimals() ) : 0;
		$refunded_amount        = isset( $_POST['refunded_amount'] ) ? kkart_format_decimal( sanitize_text_field( wp_unslash( $_POST['refunded_amount'] ) ), kkart_get_price_decimals() ) : 0;
		$refund_reason          = isset( $_POST['refund_reason'] ) ? sanitize_text_field( wp_unslash( $_POST['refund_reason'] ) ) : '';
		$line_item_qtys         = isset( $_POST['line_item_qtys'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_qtys'] ) ), true ) : array();
		$line_item_totals       = isset( $_POST['line_item_totals'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_totals'] ) ), true ) : array();
		$line_item_tax_totals   = isset( $_POST['line_item_tax_totals'] ) ? json_decode( sanitize_text_field( wp_unslash( $_POST['line_item_tax_totals'] ) ), true ) : array();
		$api_refund             = isset( $_POST['api_refund'] ) && 'true' === $_POST['api_refund'];
		$restock_refunded_items = isset( $_POST['restock_refunded_items'] ) && 'true' === $_POST['restock_refunded_items'];
		$refund                 = false;
		$response               = array();

		try {
			$order      = kkart_get_order( $order_id );
			$max_refund = kkart_format_decimal( $order->get_total() - $order->get_total_refunded(), kkart_get_price_decimals() );

			if ( ! $refund_amount || $max_refund < $refund_amount || 0 > $refund_amount ) {
				throw new Exception( __( 'Invalid refund amount', 'kkart' ) );
			}

			if ( kkart_format_decimal( $order->get_total_refunded(), kkart_get_price_decimals() ) !== $refunded_amount ) {
				throw new Exception( __( 'Error processing refund. Please try again.', 'kkart' ) );
			}

			// Prepare line items which we are refunding.
			$line_items = array();
			$item_ids   = array_unique( array_merge( array_keys( $line_item_qtys ), array_keys( $line_item_totals ) ) );

			foreach ( $item_ids as $item_id ) {
				$line_items[ $item_id ] = array(
					'qty'          => 0,
					'refund_total' => 0,
					'refund_tax'   => array(),
				);
			}
			foreach ( $line_item_qtys as $item_id => $qty ) {
				$line_items[ $item_id ]['qty'] = max( $qty, 0 );
			}
			foreach ( $line_item_totals as $item_id => $total ) {
				$line_items[ $item_id ]['refund_total'] = kkart_format_decimal( $total );
			}
			foreach ( $line_item_tax_totals as $item_id => $tax_totals ) {
				$line_items[ $item_id ]['refund_tax'] = array_filter( array_map( 'kkart_format_decimal', $tax_totals ) );
			}

			// Create the refund object.
			$refund = kkart_create_refund(
				array(
					'amount'         => $refund_amount,
					'reason'         => $refund_reason,
					'order_id'       => $order_id,
					'line_items'     => $line_items,
					'refund_payment' => $api_refund,
					'restock_items'  => $restock_refunded_items,
				)
			);

			if ( is_wp_error( $refund ) ) {
				throw new Exception( $refund->get_error_message() );
			}

			if ( did_action( 'kkart_order_fully_refunded' ) ) {
				$response['status'] = 'fully_refunded';
			}
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'error' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Delete a refund.
	 */
	public static function delete_refund() {
		check_ajax_referer( 'order-item', 'security' );

		if ( ! current_user_can( 'edit_shop_orders' ) || ! isset( $_POST['refund_id'] ) ) {
			wp_die( -1 );
		}

		$refund_ids = array_map( 'absint', is_array( $_POST['refund_id'] ) ? wp_unslash( $_POST['refund_id'] ) : array( wp_unslash( $_POST['refund_id'] ) ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		foreach ( $refund_ids as $refund_id ) {
			if ( $refund_id && 'shop_order_refund' === get_post_type( $refund_id ) ) {
				$refund   = kkart_get_order( $refund_id );
				$order_id = $refund->get_parent_id();
				$refund->delete( true );
				do_action( 'kkart_refund_deleted', $refund_id, $order_id );
			}
		}
		wp_die();
	}

	/**
	 * Triggered when clicking the rating footer.
	 */
	public static function rated() {
		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_die( -1 );
		}
		update_option( 'kkart_admin_footer_text_rated', 1 );
		wp_die();
	}

	/**
	 * Create/Update API key.
	 *
	 * @throws Exception On invalid or empty description, user, or permissions.
	 */
	public static function update_api_key() {
		ob_start();

		global $wpdb;

		check_ajax_referer( 'update-api-key', 'security' );

		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_die( -1 );
		}

		$response = array();

		try {
			if ( empty( $_POST['description'] ) ) {
				throw new Exception( __( 'Description is missing.', 'kkart' ) );
			}
			if ( empty( $_POST['user'] ) ) {
				throw new Exception( __( 'User is missing.', 'kkart' ) );
			}
			if ( empty( $_POST['permissions'] ) ) {
				throw new Exception( __( 'Permissions is missing.', 'kkart' ) );
			}

			$key_id      = isset( $_POST['key_id'] ) ? absint( $_POST['key_id'] ) : 0;
			$description = sanitize_text_field( wp_unslash( $_POST['description'] ) );
			$permissions = ( in_array( wp_unslash( $_POST['permissions'] ), array( 'read', 'write', 'read_write' ), true ) ) ? sanitize_text_field( wp_unslash( $_POST['permissions'] ) ) : 'read';
			$user_id     = absint( $_POST['user'] );

			// Check if current user can edit other users.
			if ( $user_id && ! current_user_can( 'edit_user', $user_id ) ) {
				if ( get_current_user_id() !== $user_id ) {
					throw new Exception( __( 'You do not have permission to assign API Keys to the selected user.', 'kkart' ) );
				}
			}

			if ( 0 < $key_id ) {
				$data = array(
					'user_id'     => $user_id,
					'description' => $description,
					'permissions' => $permissions,
				);

				$wpdb->update(
					$wpdb->prefix . 'kkart_api_keys',
					$data,
					array( 'key_id' => $key_id ),
					array(
						'%d',
						'%s',
						'%s',
					),
					array( '%d' )
				);

				$response                    = $data;
				$response['consumer_key']    = '';
				$response['consumer_secret'] = '';
				$response['message']         = __( 'API Key updated successfully.', 'kkart' );
			} else {
				$consumer_key    = 'ck_' . kkart_rand_hash();
				$consumer_secret = 'cs_' . kkart_rand_hash();

				$data = array(
					'user_id'         => $user_id,
					'description'     => $description,
					'permissions'     => $permissions,
					'consumer_key'    => kkart_api_hash( $consumer_key ),
					'consumer_secret' => $consumer_secret,
					'truncated_key'   => substr( $consumer_key, -7 ),
				);

				$wpdb->insert(
					$wpdb->prefix . 'kkart_api_keys',
					$data,
					array(
						'%d',
						'%s',
						'%s',
						'%s',
						'%s',
						'%s',
					)
				);

				$key_id                      = $wpdb->insert_id;
				$response                    = $data;
				$response['consumer_key']    = $consumer_key;
				$response['consumer_secret'] = $consumer_secret;
				$response['message']         = __( 'API Key generated successfully. Make sure to copy your new keys now as the secret key will be hidden once you leave this page.', 'kkart' );
				$response['revoke_url']      = '<a style="color: #a00; text-decoration: none;" href="' . esc_url( wp_nonce_url( add_query_arg( array( 'revoke-key' => $key_id ), admin_url( 'admin.php?page=kkart-settings&tab=advanced&section=keys' ) ), 'revoke' ) ) . '">' . __( 'Revoke key', 'kkart' ) . '</a>';
			}
		} catch ( Exception $e ) {
			wp_send_json_error( array( 'message' => $e->getMessage() ) );
		}

		// wp_send_json_success must be outside the try block not to break phpunit tests.
		wp_send_json_success( $response );
	}

	/**
	 * Load variations via AJAX.
	 */
	public static function load_variations() {
		ob_start();

		check_ajax_referer( 'load-variations', 'security' );

		if ( ! current_user_can( 'edit_products' ) || empty( $_POST['product_id'] ) ) {
			wp_die( -1 );
		}

		// Set $post global so its available, like within the admin screens.
		global $post;

		$loop           = 0;
		$product_id     = absint( $_POST['product_id'] );
		$post           = get_post( $product_id ); // phpcs:ignore
		$product_object = kkart_get_product( $product_id );
		$per_page       = ! empty( $_POST['per_page'] ) ? absint( $_POST['per_page'] ) : 10;
		$page           = ! empty( $_POST['page'] ) ? absint( $_POST['page'] ) : 1;
		$variations     = kkart_get_products(
			array(
				'status'  => array( 'private', 'publish' ),
				'type'    => 'variation',
				'parent'  => $product_id,
				'limit'   => $per_page,
				'page'    => $page,
				'orderby' => array(
					'menu_order' => 'ASC',
					'ID'         => 'DESC',
				),
				'return'  => 'objects',
			)
		);

		if ( $variations ) {
			kkart_render_invalid_variation_notice( $product_object );

			foreach ( $variations as $variation_object ) {
				$variation_id   = $variation_object->get_id();
				$variation      = get_post( $variation_id );
				$variation_data = array_merge( get_post_custom( $variation_id ), kkart_get_product_variation_attributes( $variation_id ) ); // kept for BW compatibility.
				include __DIR__ . '/admin/meta-boxes/views/html-variation-admin.php';
				$loop++;
			}
		}
		wp_die();
	}

	/**
	 * Save variations via AJAX.
	 */
	public static function save_variations() {
		ob_start();

		check_ajax_referer( 'save-variations', 'security' );

		// Check permissions again and make sure we have what we need.
		if ( ! current_user_can( 'edit_products' ) || empty( $_POST ) || empty( $_POST['product_id'] ) ) {
			wp_die( -1 );
		}

		$product_id                           = absint( $_POST['product_id'] );
		KKART_Admin_Meta_Boxes::$meta_box_errors = array();
		KKART_Meta_Box_Product_Data::save_variations( $product_id, get_post( $product_id ) );

		do_action( 'kkart_ajax_save_product_variations', $product_id );

		$errors = KKART_Admin_Meta_Boxes::$meta_box_errors;

		if ( $errors ) {
			echo '<div class="error notice is-dismissible">';

			foreach ( $errors as $error ) {
				echo '<p>' . wp_kses_post( $error ) . '</p>';
			}

			echo '<button type="button" class="notice-dismiss"><span class="screen-reader-text">' . esc_html__( 'Dismiss this notice.', 'kkart' ) . '</span></button>';
			echo '</div>';

			delete_option( 'kkart_meta_box_errors' );
		}

		wp_die();
	}

	/**
	 * Bulk action - Toggle Enabled.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_toggle_enabled( $variations, $data ) {
		foreach ( $variations as $variation_id ) {
			$variation = kkart_get_product( $variation_id );
			$variation->set_status( 'private' === $variation->get_status( 'edit' ) ? 'publish' : 'private' );
			$variation->save();
		}
	}

	/**
	 * Bulk action - Toggle Downloadable Checkbox.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_toggle_downloadable( $variations, $data ) {
		self::variation_bulk_toggle( $variations, 'downloadable' );
	}

	/**
	 * Bulk action - Toggle Virtual Checkbox.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_toggle_virtual( $variations, $data ) {
		self::variation_bulk_toggle( $variations, 'virtual' );
	}

	/**
	 * Bulk action - Toggle Manage Stock Checkbox.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_toggle_manage_stock( $variations, $data ) {
		self::variation_bulk_toggle( $variations, 'manage_stock' );
	}

	/**
	 * Bulk action - Set Regular Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_regular_price( $variations, $data ) {
		self::variation_bulk_set( $variations, 'regular_price', $data['value'] );
	}

	/**
	 * Bulk action - Set Sale Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_sale_price( $variations, $data ) {
		self::variation_bulk_set( $variations, 'sale_price', $data['value'] );
	}

	/**
	 * Bulk action - Set Stock Status as In Stock.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_stock_status_instock( $variations, $data ) {
		self::variation_bulk_set( $variations, 'stock_status', 'instock' );
	}

	/**
	 * Bulk action - Set Stock Status as Out of Stock.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_stock_status_outofstock( $variations, $data ) {
		self::variation_bulk_set( $variations, 'stock_status', 'outofstock' );
	}

	/**
	 * Bulk action - Set Stock Status as On Backorder.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_stock_status_onbackorder( $variations, $data ) {
		self::variation_bulk_set( $variations, 'stock_status', 'onbackorder' );
	}

	/**
	 * Bulk action - Set Stock.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_stock( $variations, $data ) {
		if ( ! isset( $data['value'] ) ) {
			return;
		}

		$quantity = kkart_stock_amount( kkart_clean( $data['value'] ) );

		foreach ( $variations as $variation_id ) {
			$variation = kkart_get_product( $variation_id );
			if ( $variation->managing_stock() ) {
				$variation->set_stock_quantity( $quantity );
			} else {
				$variation->set_stock_quantity( null );
			}
			$variation->save();
		}
	}

	/**
	 * Bulk action - Set Weight.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_weight( $variations, $data ) {
		self::variation_bulk_set( $variations, 'weight', $data['value'] );
	}

	/**
	 * Bulk action - Set Length.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_length( $variations, $data ) {
		self::variation_bulk_set( $variations, 'length', $data['value'] );
	}

	/**
	 * Bulk action - Set Width.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_width( $variations, $data ) {
		self::variation_bulk_set( $variations, 'width', $data['value'] );
	}

	/**
	 * Bulk action - Set Height.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_height( $variations, $data ) {
		self::variation_bulk_set( $variations, 'height', $data['value'] );
	}

	/**
	 * Bulk action - Set Download Limit.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_download_limit( $variations, $data ) {
		self::variation_bulk_set( $variations, 'download_limit', $data['value'] );
	}

	/**
	 * Bulk action - Set Download Expiry.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_download_expiry( $variations, $data ) {
		self::variation_bulk_set( $variations, 'download_expiry', $data['value'] );
	}

	/**
	 * Bulk action - Delete all.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_delete_all( $variations, $data ) {
		if ( isset( $data['allowed'] ) && 'true' === $data['allowed'] ) {
			foreach ( $variations as $variation_id ) {
				$variation = kkart_get_product( $variation_id );
				$variation->delete( true );
			}
		}
	}

	/**
	 * Bulk action - Sale Schedule.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_sale_schedule( $variations, $data ) {
		if ( ! isset( $data['date_from'] ) && ! isset( $data['date_to'] ) ) {
			return;
		}

		foreach ( $variations as $variation_id ) {
			$variation = kkart_get_product( $variation_id );

			if ( 'false' !== $data['date_from'] ) {
				$variation->set_date_on_sale_from( kkart_clean( $data['date_from'] ) );
			}

			if ( 'false' !== $data['date_to'] ) {
				$variation->set_date_on_sale_to( kkart_clean( $data['date_to'] ) );
			}

			$variation->save();
		}
	}

	/**
	 * Bulk action - Increase Regular Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_regular_price_increase( $variations, $data ) {
		self::variation_bulk_adjust_price( $variations, 'regular_price', '+', kkart_clean( $data['value'] ) );
	}

	/**
	 * Bulk action - Decrease Regular Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_regular_price_decrease( $variations, $data ) {
		self::variation_bulk_adjust_price( $variations, 'regular_price', '-', kkart_clean( $data['value'] ) );
	}

	/**
	 * Bulk action - Increase Sale Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_sale_price_increase( $variations, $data ) {
		self::variation_bulk_adjust_price( $variations, 'sale_price', '+', kkart_clean( $data['value'] ) );
	}

	/**
	 * Bulk action - Decrease Sale Prices.
	 *
	 * @param array $variations List of variations.
	 * @param array $data Data to set.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_action_variable_sale_price_decrease( $variations, $data ) {
		self::variation_bulk_adjust_price( $variations, 'sale_price', '-', kkart_clean( $data['value'] ) );
	}

	/**
	 * Bulk action - Set Price.
	 *
	 * @param array  $variations List of variations.
	 * @param string $field price being adjusted _regular_price or _sale_price.
	 * @param string $operator + or -.
	 * @param string $value Price or Percent.
	 *
	 * @used-by bulk_edit_variations
	 */
	private static function variation_bulk_adjust_price( $variations, $field, $operator, $value ) {
		foreach ( $variations as $variation_id ) {
			$variation   = kkart_get_product( $variation_id );
			$field_value = $variation->{"get_$field"}( 'edit' );

			if ( '%' === substr( $value, -1 ) ) {
				$percent      = kkart_format_decimal( substr( $value, 0, -1 ) );
				$field_value += NumberUtil::round( ( $field_value / 100 ) * $percent, kkart_get_price_decimals() ) * "{$operator}1";
			} else {
				$field_value += $value * "{$operator}1";
			}

			$variation->{"set_$field"}( $field_value );
			$variation->save();
		}
	}

	/**
	 * Bulk set convenience function.
	 *
	 * @param array  $variations List of variations.
	 * @param string $field Field to set.
	 * @param string $value to set.
	 */
	private static function variation_bulk_set( $variations, $field, $value ) {
		foreach ( $variations as $variation_id ) {
			$variation = kkart_get_product( $variation_id );
			$variation->{ "set_$field" }( kkart_clean( $value ) );
			$variation->save();
		}
	}

	/**
	 * Bulk toggle convenience function.
	 *
	 * @param array  $variations List of variations.
	 * @param string $field Field to toggle.
	 */
	private static function variation_bulk_toggle( $variations, $field ) {
		foreach ( $variations as $variation_id ) {
			$variation  = kkart_get_product( $variation_id );
			$prev_value = $variation->{ "get_$field" }( 'edit' );
			$variation->{ "set_$field" }( ! $prev_value );
			$variation->save();
		}
	}

	/**
	 * Bulk edit variations via AJAX.
	 *
	 * @uses KKART_AJAX::variation_bulk_set()
	 * @uses KKART_AJAX::variation_bulk_adjust_price()
	 * @uses KKART_AJAX::variation_bulk_action_variable_sale_price_decrease()
	 * @uses KKART_AJAX::variation_bulk_action_variable_sale_price_increase()
	 * @uses KKART_AJAX::variation_bulk_action_variable_regular_price_decrease()
	 * @uses KKART_AJAX::variation_bulk_action_variable_regular_price_increase()
	 * @uses KKART_AJAX::variation_bulk_action_variable_sale_schedule()
	 * @uses KKART_AJAX::variation_bulk_action_delete_all()
	 * @uses KKART_AJAX::variation_bulk_action_variable_download_expiry()
	 * @uses KKART_AJAX::variation_bulk_action_variable_download_limit()
	 * @uses KKART_AJAX::variation_bulk_action_variable_height()
	 * @uses KKART_AJAX::variation_bulk_action_variable_width()
	 * @uses KKART_AJAX::variation_bulk_action_variable_length()
	 * @uses KKART_AJAX::variation_bulk_action_variable_weight()
	 * @uses KKART_AJAX::variation_bulk_action_variable_stock()
	 * @uses KKART_AJAX::variation_bulk_action_variable_sale_price()
	 * @uses KKART_AJAX::variation_bulk_action_variable_regular_price()
	 * @uses KKART_AJAX::variation_bulk_action_toggle_manage_stock()
	 * @uses KKART_AJAX::variation_bulk_action_toggle_virtual()
	 * @uses KKART_AJAX::variation_bulk_action_toggle_downloadable()
	 * @uses KKART_AJAX::variation_bulk_action_toggle_enabled
	 */
	public static function bulk_edit_variations() {
		ob_start();

		check_ajax_referer( 'kkart_editor_nonce', 'kkart_nonce' );
		//check_ajax_referer( 'bulk_edit_variations', 'security' );


		// Check permissions again and make sure we have what we need.
		if ( ! current_user_can( 'edit_products' ) || empty( $_POST['product_id'] ) || empty( $_POST['bulk_action'] ) ) {
			wp_die( -1 );
		}
		
		$product_id  = absint( $_POST['product_id'] );
		$bulk_action = kkart_clean( wp_unslash( $_POST['bulk_action'] ) );
		$data        = ! empty( $_POST['data'] ) ? kkart_clean( wp_unslash( $_POST['data'] ) ) : array();
		$variations  = array();

		if ( apply_filters( 'kkart_bulk_edit_variations_need_children', true ) ) {
			$variations = get_posts(
				array(
					'post_parent'    => $product_id,
					'posts_per_page' => -1,
					'post_type'      => 'product_variation',
					'fields'         => 'ids',
					'post_status'    => array( 'publish', 'private' ),
				)
			);
		}

		if ( method_exists( __CLASS__, "variation_bulk_action_$bulk_action" ) ) {
			call_user_func( array( __CLASS__, "variation_bulk_action_$bulk_action" ), $variations, $data );
		} else {
			do_action( 'kkart_bulk_edit_variations_default', $bulk_action, $data, $product_id, $variations );
		}

		do_action( 'kkart_bulk_edit_variations', $bulk_action, $data, $product_id, $variations );
		KKART_Product_Variable::sync( $product_id );
		kkart_delete_product_transients( $product_id );
		wp_die();
	}
	public static function bulk_edit_variation() {
	
		check_ajax_referer( 'kkart_editor_nonce', 'kkart-nounce' );

		// Check permissions again and make sure we have what we need.
		// if ( empty( $_POST['product_id'] ) || empty( $_POST['bulk_action'] ) ) {
			// wp_die( -1 );
		// }

		$product_id  = absint( $_POST['product_id'] );
		$bulk_action = kkart_clean( wp_unslash( $_POST['bulk_action'] ) );
		$data        = ! empty( $_POST['data'] ) ? kkart_clean( wp_unslash( $_POST['data'] ) ) : array();
		$variations  = array();

		if ( apply_filters( 'kkart_bulk_edit_variations_need_children', true ) ) {
			$variations = get_posts(
				array(
					'post_parent'    => $product_id,
					'posts_per_page' => -1,
					'post_type'      => 'product_variation',
					'fields'         => 'ids',
					'post_status'    => array( 'publish', 'private' ),
				)
			);
		}

		if ( method_exists( __CLASS__, "variation_bulk_action_$bulk_action" ) ) {
			call_user_func( array( __CLASS__, "variation_bulk_action_$bulk_action" ), $variations, $data );
		} else {
			do_action( 'kkart_bulk_edit_variations_default', $bulk_action, $data, $product_id, $variations );
		}

		do_action( 'kkart_bulk_edit_variations', $bulk_action, $data, $product_id, $variations );
		KKART_Product_Variable::sync( $product_id );
		kkart_delete_product_transients( $product_id );
		wp_die();
	}


	/**
	 * Handle submissions from assets/js/settings-views-html-settings-tax.js Backbone model.
	 */
	public static function tax_rates_save_changes() {
		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( ! isset( $_POST['kkart_tax_nonce'], $_POST['changes'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		$current_class = ! empty( $_POST['current_class'] ) ? wp_unslash( $_POST['current_class'] ) : ''; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_tax_nonce'] ), 'kkart_tax_nonce-class:' . $current_class ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		$current_class = KKART_Tax::format_tax_rate_class( $current_class );

		// Check User Caps.
		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$changes = wp_unslash( $_POST['changes'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		foreach ( $changes as $tax_rate_id => $data ) {
			if ( isset( $data['deleted'] ) ) {
				if ( isset( $data['newRow'] ) ) {
					// So the user added and deleted a new row.
					// That's fine, it's not in the database anyways. NEXT!
					continue;
				}
				KKART_Tax::_delete_tax_rate( $tax_rate_id );
			}

			$tax_rate = array_intersect_key(
				$data,
				array(
					'tax_rate_country'  => 1,
					'tax_rate_state'    => 1,
					'tax_rate'          => 1,
					'tax_rate_name'     => 1,
					'tax_rate_priority' => 1,
					'tax_rate_compound' => 1,
					'tax_rate_shipping' => 1,
					'tax_rate_order'    => 1,
				)
			);

			if ( isset( $tax_rate['tax_rate'] ) ) {
				$tax_rate['tax_rate'] = kkart_format_decimal( $tax_rate['tax_rate'] );
			}

			if ( isset( $data['newRow'] ) ) {
				$tax_rate['tax_rate_class'] = $current_class;
				$tax_rate_id                = KKART_Tax::_insert_tax_rate( $tax_rate );
			} elseif ( ! empty( $tax_rate ) ) {
				KKART_Tax::_update_tax_rate( $tax_rate_id, $tax_rate );
			}

			if ( isset( $data['postcode'] ) ) {
				$postcode = array_map( 'kkart_clean', $data['postcode'] );
				$postcode = array_map( 'kkart_normalize_postcode', $postcode );
				KKART_Tax::_update_tax_rate_postcodes( $tax_rate_id, $postcode );
			}
			if ( isset( $data['city'] ) ) {
				KKART_Tax::_update_tax_rate_cities( $tax_rate_id, array_map( 'kkart_clean', array_map( 'wp_unslash', $data['city'] ) ) );
			}
		}

		KKART_Cache_Helper::invalidate_cache_group( 'taxes' );
		KKART_Cache_Helper::get_transient_version( 'shipping', true );

		wp_send_json_success(
			array(
				'rates' => KKART_Tax::get_rates_for_tax_class( $current_class ),
			)
		);
		// phpcs:enable
	}

	/**
	 * Handle submissions from assets/js/kkart-shipping-zones.js Backbone model.
	 */
	public static function shipping_zones_save_changes() {
		if ( ! isset( $_POST['kkart_shipping_zones_nonce'], $_POST['changes'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_shipping_zones_nonce'] ), 'kkart_shipping_zones_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		// Check User Caps.
		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$changes = wp_unslash( $_POST['changes'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		foreach ( $changes as $zone_id => $data ) {
			if ( isset( $data['deleted'] ) ) {
				if ( isset( $data['newRow'] ) ) {
					// So the user added and deleted a new row.
					// That's fine, it's not in the database anyways. NEXT!
					continue;
				}
				KKART_Shipping_Zones::delete_zone( $zone_id );
				continue;
			}

			$zone_data = array_intersect_key(
				$data,
				array(
					'zone_id'    => 1,
					'zone_order' => 1,
				)
			);

			if ( isset( $zone_data['zone_id'] ) ) {
				$zone = new KKART_Shipping_Zone( $zone_data['zone_id'] );

				if ( isset( $zone_data['zone_order'] ) ) {
					$zone->set_zone_order( $zone_data['zone_order'] );
				}

				$zone->save();
			}
		}

		wp_send_json_success(
			array(
				'zones' => KKART_Shipping_Zones::get_zones( 'json' ),
			)
		);
	}

	/**
	 * Handle submissions from assets/js/kkart-shipping-zone-methods.js Backbone model.
	 */
	public static function shipping_zone_add_method() {
		if ( ! isset( $_POST['kkart_shipping_zones_nonce'], $_POST['zone_id'], $_POST['method_id'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_shipping_zones_nonce'] ), 'kkart_shipping_zones_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		// Check User Caps.
		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$zone_id     = kkart_clean( wp_unslash( $_POST['zone_id'] ) );
		$zone        = new KKART_Shipping_Zone( $zone_id );
		$instance_id = $zone->add_shipping_method( kkart_clean( wp_unslash( $_POST['method_id'] ) ) );

		wp_send_json_success(
			array(
				'instance_id' => $instance_id,
				'zone_id'     => $zone->get_id(),
				'zone_name'   => $zone->get_zone_name(),
				'methods'     => $zone->get_shipping_methods( false, 'json' ),
			)
		);
	}

	/**
	 * Handle submissions from assets/js/kkart-shipping-zone-methods.js Backbone model.
	 */
	public static function shipping_zone_methods_save_changes() {
		if ( ! isset( $_POST['kkart_shipping_zones_nonce'], $_POST['zone_id'], $_POST['changes'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_shipping_zones_nonce'] ), 'kkart_shipping_zones_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		global $wpdb;

		$zone_id = kkart_clean( wp_unslash( $_POST['zone_id'] ) );
		$zone    = new KKART_Shipping_Zone( $zone_id );
		$changes = wp_unslash( $_POST['changes'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		if ( isset( $changes['zone_name'] ) ) {
			$zone->set_zone_name( kkart_clean( $changes['zone_name'] ) );
		}

		if ( isset( $changes['zone_locations'] ) ) {
			$zone->clear_locations( array( 'state', 'country', 'continent' ) );
			$locations = array_filter( array_map( 'kkart_clean', (array) $changes['zone_locations'] ) );
			foreach ( $locations as $location ) {
				// Each posted location will be in the format type:code.
				$location_parts = explode( ':', $location );
				switch ( $location_parts[0] ) {
					case 'state':
						$zone->add_location( $location_parts[1] . ':' . $location_parts[2], 'state' );
						break;
					case 'country':
						$zone->add_location( $location_parts[1], 'country' );
						break;
					case 'continent':
						$zone->add_location( $location_parts[1], 'continent' );
						break;
				}
			}
		}

		if ( isset( $changes['zone_postcodes'] ) ) {
			$zone->clear_locations( 'postcode' );
			$postcodes = array_filter( array_map( 'strtoupper', array_map( 'kkart_clean', explode( "\n", $changes['zone_postcodes'] ) ) ) );
			foreach ( $postcodes as $postcode ) {
				$zone->add_location( $postcode, 'postcode' );
			}
		}

		if ( isset( $changes['methods'] ) ) {
			foreach ( $changes['methods'] as $instance_id => $data ) {
				$method_id = $wpdb->get_var( $wpdb->prepare( "SELECT method_id FROM {$wpdb->prefix}kkart_shipping_zone_methods WHERE instance_id = %d", $instance_id ) );

				if ( isset( $data['deleted'] ) ) {
					$shipping_method = KKART_Shipping_Zones::get_shipping_method( $instance_id );
					$option_key      = $shipping_method->get_instance_option_key();
					if ( $wpdb->delete( "{$wpdb->prefix}kkart_shipping_zone_methods", array( 'instance_id' => $instance_id ) ) ) {
						delete_option( $option_key );
						do_action( 'kkart_shipping_zone_method_deleted', $instance_id, $method_id, $zone_id );
					}
					continue;
				}

				$method_data = array_intersect_key(
					$data,
					array(
						'method_order' => 1,
						'enabled'      => 1,
					)
				);

				if ( isset( $method_data['method_order'] ) ) {
					$wpdb->update( "{$wpdb->prefix}kkart_shipping_zone_methods", array( 'method_order' => absint( $method_data['method_order'] ) ), array( 'instance_id' => absint( $instance_id ) ) );
				}

				if ( isset( $method_data['enabled'] ) ) {
					$is_enabled = absint( 'yes' === $method_data['enabled'] );
					if ( $wpdb->update( "{$wpdb->prefix}kkart_shipping_zone_methods", array( 'is_enabled' => $is_enabled ), array( 'instance_id' => absint( $instance_id ) ) ) ) {
						do_action( 'kkart_shipping_zone_method_status_toggled', $instance_id, $method_id, $zone_id, $is_enabled );
					}
				}
			}
		}

		$zone->save();

		wp_send_json_success(
			array(
				'zone_id'   => $zone->get_id(),
				'zone_name' => $zone->get_zone_name(),
				'methods'   => $zone->get_shipping_methods( false, 'json' ),
			)
		);
	}

	/**
	 * Save method settings
	 */
	public static function shipping_zone_methods_save_settings() {
		if ( ! isset( $_POST['kkart_shipping_zones_nonce'], $_POST['instance_id'], $_POST['data'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_shipping_zones_nonce'] ), 'kkart_shipping_zones_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$instance_id     = absint( $_POST['instance_id'] );
		$zone            = KKART_Shipping_Zones::get_zone_by( 'instance_id', $instance_id );
		$shipping_method = KKART_Shipping_Zones::get_shipping_method( $instance_id );
		$shipping_method->set_post_data( wp_unslash( $_POST['data'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$shipping_method->process_admin_options();

		KKART_Cache_Helper::get_transient_version( 'shipping', true );

		wp_send_json_success(
			array(
				'zone_id'   => $zone->get_id(),
				'zone_name' => $zone->get_zone_name(),
				'methods'   => $zone->get_shipping_methods( false, 'json' ),
				'errors'    => $shipping_method->get_errors(),
			)
		);
	}

	/**
	 * Handle submissions from assets/js/kkart-shipping-classes.js Backbone model.
	 */
	public static function shipping_classes_save_changes() {
		if ( ! isset( $_POST['kkart_shipping_classes_nonce'], $_POST['changes'] ) ) {
			wp_send_json_error( 'missing_fields' );
			wp_die();
		}

		if ( ! wp_verify_nonce( wp_unslash( $_POST['kkart_shipping_classes_nonce'] ), 'kkart_shipping_classes_nonce' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			wp_send_json_error( 'bad_nonce' );
			wp_die();
		}

		if ( ! current_user_can( 'manage_kkart' ) ) {
			wp_send_json_error( 'missing_capabilities' );
			wp_die();
		}

		$changes = wp_unslash( $_POST['changes'] ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

		foreach ( $changes as $term_id => $data ) {
			$term_id = absint( $term_id );

			if ( isset( $data['deleted'] ) ) {
				if ( isset( $data['newRow'] ) ) {
					// So the user added and deleted a new row.
					// That's fine, it's not in the database anyways. NEXT!
					continue;
				}
				wp_delete_term( $term_id, 'product_shipping_class' );
				continue;
			}

			$update_args = array();

			if ( isset( $data['name'] ) ) {
				$update_args['name'] = kkart_clean( $data['name'] );
			}

			if ( isset( $data['slug'] ) ) {
				$update_args['slug'] = kkart_clean( $data['slug'] );
			}

			if ( isset( $data['description'] ) ) {
				$update_args['description'] = kkart_clean( $data['description'] );
			}

			if ( isset( $data['newRow'] ) ) {
				$update_args = array_filter( $update_args );
				if ( empty( $update_args['name'] ) ) {
					continue;
				}
				$inserted_term = wp_insert_term( $update_args['name'], 'product_shipping_class', $update_args );
				$term_id       = is_wp_error( $inserted_term ) ? 0 : $inserted_term['term_id'];
			} else {
				wp_update_term( $term_id, 'product_shipping_class', $update_args );
			}

			do_action( 'kkart_shipping_classes_save_class', $term_id, $data );
		}

		$kkart_shipping = KKART_Shipping::instance();

		wp_send_json_success(
			array(
				'shipping_classes' => $kkart_shipping->get_shipping_classes(),
			)
		);
	}

	/**
	 * Toggle payment gateway on or off via AJAX.
	 *
	 * @since 3.4.0
	 */
	public static function toggle_gateway_enabled() {
		if ( current_user_can( 'manage_kkart' ) && check_ajax_referer( 'kkart-toggle-payment-gateway-enabled', 'security' ) && isset( $_POST['gateway_id'] ) ) {
			// Load gateways.
			$payment_gateways = KKART()->payment_gateways->payment_gateways();

			// Get posted gateway.
			$gateway_id = kkart_clean( wp_unslash( $_POST['gateway_id'] ) );

			foreach ( $payment_gateways as $gateway ) {
				if ( ! in_array( $gateway_id, array( $gateway->id, sanitize_title( get_class( $gateway ) ) ), true ) ) {
					continue;
				}
				$enabled = $gateway->get_option( 'enabled', 'no' );

				if ( ! kkart_string_to_bool( $enabled ) ) {
					if ( $gateway->needs_setup() ) {
						wp_send_json_error( 'needs_setup' );
						wp_die();
					} else {
						$gateway->update_option( 'enabled', 'yes' );
					}
				} else {
					// Disable the gateway.
					$gateway->update_option( 'enabled', 'no' );
				}

				wp_send_json_success( ! kkart_string_to_bool( $enabled ) );
				wp_die();
			}
		}

		wp_send_json_error( 'invalid_gateway_id' );
		wp_die();
	}
	
	//Products Categories Handler
	function product_archives(){
		
		// TODO: change
		// Some AJAX security
		check_ajax_referer('pagelayer_ajax', 'pagelayer_nonce');
		
		// Load Shortcodes
		pagelayer_load_shortcodes();
		
		// Call the function
		kkart_sc_product_archives($_POST);

		echo $_POST['atts']['product_archives'];
		
		wp_die();
	}
	
	public static function account_order_details(){
		
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		if ( ! isset( $_POST['order_id'] ) ) {
			wp_die( -1 );
		}

		$order_id =  $_POST['order_id'] ;
		
		$result = kkart_account_view_order($order_id);
		
		echo $result;
		
		wp_die();
	}
	
	//Customer Order List
	function get_order_lists(){

		// TODO: change
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$sel_col = $_POST['sel_col'];
		
		//TODO: for valid user and logged in user
		$current_user_id = get_current_user_id();
		
		$order_ids = kkart_get_orders(
			array(
				'limit'    => -1,
				'customer' => $current_user_id,
				'return'   => 'ids',
			)
		);
		
		if(!empty($order_ids)){
			
			foreach($order_ids as $ik => $iv){
				
				$order = kkart_get_order( absint( $iv ) );
				$item_count = $order->get_item_count();
				
				foreach($sel_col as $sk => $sv){
					
					if('order-number' == $sv){
						$order_data[$iv][$sk] = $order->get_order_number();
					}
					if('order-date' == $sv){
						$order_data[$iv][$sk] = kkart_format_datetime($order->get_date_created());
					}
					if('order-status' == $sv){
						$order_data[$iv][$sk] = $order->get_status();
					}
					if('order-total' == $sv){
						$order_data[$iv][$sk] = sprintf( _n( '%1$s for %2$s item', '%1$s for %2$s items', $item_count, 'kkart' ), $order->get_formatted_order_total(), $item_count );
					}
					if('order-actions' == $sv){
						$order_data[$iv][$sk] = kkart_get_account_orders_actions($order);
					}
				}
			}
		}
		
		wp_send_json_success($order_data);
		
		wp_die();
	}
	
	//Customer Order Downloads
	function get_order_downloads(){

		// TODO: change
		// Some AJAX security
		check_ajax_referer( 'kkart_ajax', 'kkart_nonce' );
		
		$sel_col = $_POST['sel_col'];
		
		//TODO: for valid user and logged in user
		$current_user_id = get_current_user_id();
		
		$downloads = KKART()->customer->get_downloadable_products();
		
		if(!empty($downloads)){
			
			foreach($downloads as $dk => $dv){
				
				foreach($sel_col as $sk => $sv){
					
					if('download-product' == $sv){
						if ( $dv['product_url'] ) {
							$download_data[$dk][$sk] = '<a href="' . esc_url( $dv['product_url'] ) . '">' . esc_html( $dv['product_name'] ) . '</a>';
						} else {
							$download_data[$dk][$sk] = esc_html( $dv['product_name'] );
						}
					}
					if('download-file' == $sv){
						$download_data[$dk][$sk] = '<a href="' . esc_url( $dv['download_url'] ) . '" class="kkart-MyAccount-downloads-file button alt">' . esc_html( $dv['download_name'] ) . '</a>';
					}
					if('download-remaining' == $sv){
						$download_data[$dk][$sk] = is_numeric( $dv['downloads_remaining'] ) ? esc_html( $dv['downloads_remaining'] ) : esc_html__( '&infin;', 'kkart' );
					}
					if('download-expires' == $sv){
						if ( ! empty( $dv['access_expires'] ) ) {
							$download_data[$dk][$sk] = '<time datetime="' . esc_attr( date( 'Y-m-d', strtotime( $dv['access_expires'] ) ) ) . '" title="' . esc_attr( strtotime( $dv['access_expires'] ) ) . '">' . esc_html( date_i18n( get_option( 'date_format' ), strtotime( $dv['access_expires'] ) ) ) . '</time>';
						} else {
							$download_data[$dk][$sk] = esc_html__( 'Never', 'kkart' );
						}
					}
				}
			}
		}
		
		wp_send_json_success($download_data);
	}
	
	public static function get_cart_items(){
		
		$items = KKART()->cart->get_cart();
		
		if(!empty($items)){
			wp_send_json_success($items);
		}else{
			wp_send_json_error('error!!');
		}			
	}
	
	public static function set_cart_quantity(){
		
		$cart_item_key = $_POST['cart_item_key'];
		$quantity = $_POST['quantity'];

		$return = KKART()->cart->set_quantity($cart_item_key, $quantity);
		
		wp_send_json_success($return);
		wp_die();
	}
	
	public static function get_cart_data(){
		
		$quantity = KKART()->cart->get_cart_contents_count();
		
		// Get min cart
		ob_start();
		kkart_mini_cart();
		$mini_cart = ob_get_clean();
		
		// Cart sub total
		ob_start();
		kkart_cart_totals_subtotal_html();
		$cart_total = ob_get_clean();
		
		$response = array(
		   'fragments' =>  $mini_cart,
		   'quantity' => $quantity,
		   'price' => $cart_total
		);
		
		wp_send_json_success($response);
		wp_die();
	}
}

KKART_AJAX::init();