Bulk variable subscription pricing

// Add Settings Tab
add_filter( 'woocommerce_get_sections_products', function( $sections ) {

	$sections['ccom_bulkpricing'] = 'Bulk variable subscription pricing';

	return $sections;

} );

// Add Settings Fields
add_filter( 'woocommerce_get_settings_products',
	function( $settings, $current_section ) {

	// Only This Section
	if ( $current_section != 'ccom_bulkpricing' ) {
		return $settings;
	}

	// Return Settings Array
	return [

		// Add Section Title
		[ 'id' => 'ccom_bvsp_title', 'name' => 'Bulk Variable Subscription Pricing', 'type' => 'title' ],

		// Settings
		[
			'id' => 'ccom_bvsp_percentage', 'name' => 'Multiplier', 'type' => 'text',
			'desc' => 'Enter a positive or negative multiplier.',
			'desc_tip' => 'Example: To increase prices by 10% enter 1.1 in this field and empty the below field Basing.',
		],
		[
			'id' => 'ccom_bvsp_field', 'name' => 'Basing', 'type' => 'text',
			'desc' => 'Which custom product field to base price on? Leave blank to use the current variation price.',
			'desc_tip' => ' Example: _retail_price field then set the above Multiplier field to 0.10 for 10% of retail price.',
		],
		[
			'id' => 'ccom_bvsp_signup', 'name' => 'Signup fee', 'type' => 'checkbox',
			'desc' => 'Check to set the signup fee to the same amount, otherwise will set it to zero.',
		],
		[
			'id' => 'ccom_bvsp_attr_name', 'name' => 'Attribute name', 'type' => 'text',
			'desc' => 'Which subscription variation attribute shall we affect?',
			'desc_tip' => 'Example: attribute_pa_rental-period',
		],
		[
			'id' => 'ccom_bvsp_attr_value', 'name' => 'Attribute value', 'type' => 'text',
			'desc' => 'Which value from the above selected attribute shall we affect?',
			'desc_tip' => 'Example: rent-monthly or rent-1-7-days',
		],

		// Add Run Now Field
		[
			'id' => 'ccom_bvsp_run',
			'name' => 'Run Now',
			'type' => 'textarea',
			'placeholder' =>
				'Updates 25 products at a time.'
				. ' Results appear inside this box.'
				. ' When done box it will read [EOF].',
			'desc' => '
				<p>
					<a href="#" class="button" id="ccom_bulkpricing_button">
						Run variable subscription price updater
					</a>
				</p>
				<p>
					If you have changed any values on this page,
					please click Save changes button before running.
				</p>
			',
		],

		// End Settings Section
		[ 'id' => 'ccom_bvsp_section_end', 'type' => 'sectionend' ],
	];

}, 10, 2 );

// AJAX Handler
add_action( 'wp_ajax_ccom_bulkpricing', function() {

	// Get Set Of Parent / Variable Products
	$offset = empty( $_POST['offset'] ) ? 0 : intval( $_POST['offset'] );
	$args = [
		'limit' => 25,
		'offset' => $offset,
		'orderby' => 'ID',
		'order' => 'ASC',
		'status' => 'publish',
	];
    $products = wc_get_products( $args );
	if( ! $products ) {
		wp_die();
	}

	// Loop Products
	foreach( $products as $product ) {

		// Print Product ID
		printf( '[%d] ', $product->get_id() );

		// Variations Only
		if( ! $product->is_type( 'variable' ) ) {
			continue;
		}

		// Get Variations
		$variations = $product->get_available_variations();
		foreach( $variations as $variation ) {

			// Update Signup Fee For Monthly Variation
			foreach( $variation['attributes'] as $attribute_name => $attribute_value ) {
				if(
					$attribute_name == get_option( 'ccom_bvsp_attr_name' )
					&& $attribute_value == get_option( 'ccom_bvsp_attr_value' )
				) {
					$variation_id = $variation['variation_id'];
					$product_variation = wc_get_product( $variation_id );
					printf( '(%d) ', $variation_id );

					// Get Price
					$price = ( float ) $product_variation->get_price();
					$ccom_bvsp_field = get_option( 'ccom_bvsp_field' )
						? $product->get_meta(
							get_option( 'ccom_bvsp_field' ), true
						) : $price;
					if( ! $ccom_bvsp_field ) { continue; }
					$new_price = number_format(
						$ccom_bvsp_field * get_option( 'ccom_bvsp_percentage' ), 2
					);

					// Set Price
					$product_variation->update_meta_data( '_regular_price', $new_price );
					$product_variation->update_meta_data( '_price', $new_price );
					$product_variation->update_meta_data( '_subscription_price', $new_price );
					$product_variation->update_meta_data(
						'_subscription_sign_up_fee',
						get_option( 'ccom_bvsp_signup' ) == 'yes' ? $new_price : 0
					);
					$product_variation->save();
					wc_delete_product_transients( $variation_id );
				}
			}
		}

		// Sync Parent Price Ranges
		wc_delete_product_transients( $product->get_id() );
		$product->variable_product_sync();
	}

	// Exit
	wp_die();

} );

// jQuery
add_action( 'admin_enqueue_scripts', function( $page ) {

	// Only Load On Our Settings Page
	if( $page != 'woocommerce_page_wc-settings' ) { return; }
	if( empty( $_REQUEST['section'] ) || $_REQUEST['section'] != 'ccom_bulkpricing' ) {
		return;
	}
	ob_start();
	?>

	<script type="text/javascript">
	var ccom_bulkpricing_offset = 0;
	jQuery( document ).ready( function( $ ) {
		$( "#ccom_bulkpricing_button" ).click( function() {
			ccom_bulkpricing( $ );
			return false;
		} );
	} );
	function ccom_bulkpricing( $ ) {
		var data = {
			"action": "ccom_bulkpricing",
			"offset": ccom_bulkpricing_offset
		};
		$.post( ajaxurl, data, function( response ) {

			// Handle EOF Or Error
			if( response == "" ) {
				$( "textarea#ccom_bvsp_run" ).append( " [EOF] " );
				return;
			}

			// Display Page Processed
			$( "textarea#ccom_bvsp_run" ).append( " [" + ccom_bulkpricing_offset + "] " );

			// Advance
			ccom_bulkpricing_offset += 25;
			ccom_bulkpricing( $ );
		} );
	}
	</script>

	<?php
	$js = ob_get_clean();
	wp_add_inline_script( 'jquery', $js );

} );