<?php
/**
 * Adds selected extras (quantity × unit price).
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Pricing\Modifiers;

use Bookline\Domain\Pricing\Money;
use Bookline\Domain\Pricing\PriceContext;
use Bookline\Domain\Pricing\PriceModifier;

/**
 * Priority 30 — extras line totals.
 *
 * @since 0.1.0
 */
final class ExtrasPrice implements PriceModifier {

	/**
	 * Priority.
	 *
	 * @since 0.1.0
	 */
	public function priority(): int {
		return 30;
	}

	/**
	 * Add extras to the running total.
	 *
	 * @param PriceContext $ctx     Context.
	 * @param Money        $running Running total.
	 *
	 * @since 0.1.0
	 */
	public function apply( PriceContext $ctx, Money $running ): Money {
		foreach ( $ctx->selected_extras() as $extra ) {
			$running = $running->add( $extra->line_total() );
		}
		return $running;
	}
}