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Edit File: CouponPreProcessor.php

<?php declare(strict_types = 1);

namespace MailPoet\WooCommerce;

if (!defined('ABSPATH')) exit;

use MailPoet\Entities\NewsletterEntity;
use MailPoet\Entities\SendingQueueEntity;
use MailPoet\Newsletter\NewslettersRepository;
use MailPoet\Newsletter\Renderer\Blocks\Coupon;
use MailPoet\NewsletterProcessingException;
use MailPoet\WP\DateTime;

class CouponPreProcessor {

/** @var bool */
  private $generated = false;

/** @var NewslettersRepository */
  private $newslettersRepository;

/** @var Helper */
  private $wcHelper;

public function __construct(
    Helper $wcHelper,
    NewslettersRepository $newslettersRepository
  ) {
    $this->wcHelper = $wcHelper;
    $this->newslettersRepository = $newslettersRepository;
  }

/**
   * @throws NewsletterProcessingException
   */
  public function processCoupons(NewsletterEntity $newsletter, array $blocks, bool $preview = false, ?SendingQueueEntity $sendingQueue = null): array {
    if ($preview) {
      return $blocks;
    }

$generated = $this->ensureCouponForBlocks($blocks, $newsletter, $sendingQueue);
    $body = $newsletter->getBody();

if ($generated && $body && $this->shouldPersist($newsletter)) {
      $updatedBody = array_merge(
        $body,
        [
          'content' => array_merge(
            $body['content'],
            ['blocks' => $blocks]
          ),
        ]
      );
      $newsletter->setBody($updatedBody);
      $this->newslettersRepository->flush();
    }
    return $blocks;
  }

private function ensureCouponForBlocks(array &$blocks, NewsletterEntity $newsletter, ?SendingQueueEntity $sendingQueue): bool {
    foreach ($blocks as &$innerBlock) {
      if (isset($innerBlock['blocks']) && !empty($innerBlock['blocks'])) {
        $this->ensureCouponForBlocks($innerBlock['blocks'], $newsletter, $sendingQueue);
      }
      if (isset($innerBlock['type']) && $innerBlock['type'] === Coupon::TYPE) {
        if (!$this->wcHelper->isWooCommerceActive()) {
          throw NewsletterProcessingException::create()->withMessage(__('WooCommerce is not active', 'mailpoet'));
        }
        if ($this->shouldGenerateCoupon($innerBlock)) {
          try {
            $innerBlock['couponId'] = $this->addOrUpdateCoupon($innerBlock, $newsletter, $sendingQueue);
            $this->generated = true;
          } catch (\Exception $e) {
            throw NewsletterProcessingException::create()->withMessage($e->getMessage())->withCode($e->getCode());
          }
        }
      }
    }

return $this->generated;
  }

/**
   * @param array $couponBlock
   * @param NewsletterEntity $newsletter
   * @param SendingQueueEntity|null $sendingQueue
   * @return int
   * @throws \WC_Data_Exception|\Exception
   */
  private function addOrUpdateCoupon(array $couponBlock, NewsletterEntity $newsletter, ?SendingQueueEntity $sendingQueue) {
    $coupon = $this->wcHelper->createWcCoupon($couponBlock['couponId'] ?? '');
    if ($this->shouldGenerateCoupon($couponBlock)) {
      $code = isset($couponBlock['code']) && $couponBlock['code'] !== Coupon::CODE_PLACEHOLDER ? $couponBlock['code'] : $this->generateRandomCode();
      $coupon->set_code($code);
    }

$coupon->set_description(
      sprintf(
      // translators: %1$s is newsletter id and %2$s is the subject.
        _x('Auto Generated coupon by MailPoet for email: %1$s: %2$s', 'Coupon block code generation', 'mailpoet'),
        $newsletter->getId(),
        $newsletter->getSubject()
      )
    );

// general
    $coupon->set_discount_type($couponBlock['discountType']);

if (isset($couponBlock['amount'])) {
      $coupon->set_amount($couponBlock['amount']);
    }

if (isset($couponBlock['expiryDay'])) {
      $expiration = (new DateTime())->getCurrentDateTime()
        ->modify("+{$couponBlock['expiryDay']} day")
        ->getTimestamp();
      $coupon->set_date_expires($expiration);
    }

$coupon->set_free_shipping($couponBlock['freeShipping'] ?? false);

// usage restriction
    $coupon->set_minimum_amount($couponBlock['minimumAmount'] ?? '');
    $coupon->set_maximum_amount($couponBlock['maximumAmount'] ?? '');
    $coupon->set_individual_use($couponBlock['individualUse'] ?? false);
    $coupon->set_exclude_sale_items($couponBlock['excludeSaleItems'] ?? false);

$coupon->set_product_ids($this->getItemIds($couponBlock['productIds'] ?? []));
    $coupon->set_excluded_product_ids($this->getItemIds($couponBlock['excludedProductIds'] ?? []));

$coupon->set_product_categories($this->getItemIds($couponBlock['productCategoryIds'] ?? []));
    $coupon->set_excluded_product_categories($this->getItemIds($couponBlock['excludedProductCategoryIds'] ?? []));

$emailRestrictions = [];
    if (!empty($couponBlock['emailRestrictions'])) {
      $emailRestrictions = explode(',', $couponBlock['emailRestrictions']);
    }

if (!empty($couponBlock['restrictToSubscriber']) && $sendingQueue && $sendingQueue->getTask()) {
      $subscribers = $sendingQueue->getTask()->getSubscribers();
      if (is_iterable($subscribers) && count($subscribers) === 1) { // Only apply to single-subscriber sending queues
        foreach ($subscribers as $taskSubscriber) {
          $subscriber = $taskSubscriber->getSubscriber();
          if ($subscriber && $subscriber->getEmail()) {
            $emailRestrictions[] = $subscriber->getEmail();
          }
        }
      }
    }

$coupon->set_email_restrictions(array_unique(array_filter($emailRestrictions)));

// usage limit
    $coupon->set_usage_limit($couponBlock['usageLimit'] ?? 0);
    $coupon->set_usage_limit_per_user($couponBlock['usageLimitPerUser'] ?? 0);
    return $coupon->save();
  }

private function getItemIds(array $items): array {
    if (empty($items)) {
      return [];
    }

return array_map(function ($item) {
      return $item['id'];
    }, $items);
  }

private function generateRandomSegment($length) {
    $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $segment = '';

for ($i = 0; $i < $length; $i++) {
      $randomIndex = rand(0, strlen($characters) - 1);
      $segment .= $characters[$randomIndex];
    }

return $segment;
  }

/**
   * Generates Coupon code for XXXX-XXXXXX-XXXX pattern
   */
  private function generateRandomCode(): string {
    $part1 = $this->generateRandomSegment(4);
    $part2 = $this->generateRandomSegment(6);
    $part3 = $this->generateRandomSegment(4);

return $part1 . '-' . $part2 . '-' . $part3;
  }

private function shouldGenerateCoupon(array $block): bool {
    return empty($block['couponId']);
  }

/**
   * Only emails that can have their body-HTML re-generated should persist the generated couponId
   */
  private function shouldPersist(NewsletterEntity $newsletter): bool {
    return in_array($newsletter->getType(), NewsletterEntity::TYPES_WITH_RESETTABLE_BODY);
  }
}

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