<?php
/**
* Copyright © MageWorx. All rights reserved.
* See LICENSE.txt for license details.
*/

namespace MageWorx\GiftCards\Observer;

use Magento\Framework\Event\ObserverInterface;
use MageWorx\GiftCards\Model\GiftCards;

class SendExpirationAlertEmails implements ObserverInterface
{
/**
* @var \MageWorx\GiftCards\Model\ResourceModel\GiftCards\CollectionFactory
*/
protected $giftcardsCollection;

/**
* @var \MageWorx\GiftCards\Model\GiftCardsFactory
*/
protected $giftCardsFactory;

/**
* @var \MageWorx\GiftCards\Helper\Data
*/
protected $helper;

/**
* SendExpirationAlertEmails constructor.
*
* @param \MageWorx\GiftCards\Model\ResourceModel\GiftCards\CollectionFactory $giftcardsCollection
* @param \MageWorx\GiftCards\Model\GiftCardsFactory $giftCardsFactory
* @param \MageWorx\GiftCards\Helper\Data $helper
*/
public function __construct(
\MageWorx\GiftCards\Model\ResourceModel\GiftCards\CollectionFactory $giftcardsCollection,
\MageWorx\GiftCards\Model\GiftCardsFactory $giftCardsFactory,
\MageWorx\GiftCards\Helper\Data $helper
) {
$this->giftcardsCollection = $giftcardsCollection;
$this->giftCardsFactory = $giftCardsFactory;
$this->helper = $helper;
}

/**
* @param \Magento\Framework\Event\Observer $observer
*/
public function execute(\Magento\Framework\Event\Observer $observer)
{
$cards = $this->giftcardsCollection->create()
->addFieldToFilter('expiration_alert_email_send', 0)
->addFieldToFilter('card_balance', ['gt' => 0])
->addFieldToFilter('card_status', ['nin' => [GiftCards::STATUS_USED]])
->load();

foreach ($cards as $card) {
$model = $this->giftCardsFactory->create();
$model->load($card->getId());

if ($this->helper->getAlertDays() && $model->getExpireDate()) {
if ($this->helper->calculateExpireIn($model->getExpireDate()) <= $this->helper->getAlertDays()) {
$model->sendCardExpirationAlert();
$model->setExpirationAlertEmailSend(true);
$model->save();
}
}
}
}
}