<?php
namespace Acx\StorePickup\Model;

use Magento\Config\Model\Config\Source\Locale\Currency\All;

class Payment extends \Magento\Payment\Model\Method\AbstractMethod
{
const PAYMENT_METHOD_IN_STORE_PICKUP_MULTI_CODE = 'storePickupCash';

protected $_code = self::PAYMENT_METHOD_IN_STORE_PICKUP_MULTI_CODE;

/**
* Availability option
*
* @var bool
*/
protected $_isOffline = true;

/**
* @var \Magento\Checkout\Model\Session
*/
private $checkoutSession;

public function __construct(
\Magento\Framework\Model\Context $context,
\Magento\Framework\Registry $registry,
\Magento\Framework\Api\ExtensionAttributesFactory $extensionFactory,
\Magento\Framework\Api\AttributeValueFactory $customAttributeFactory,
\Magento\Payment\Helper\Data $paymentData,
\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
\Magento\Payment\Model\Method\Logger $logger,
\Magento\Checkout\Model\Session $checkoutSession,
\Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
\Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
array $data = []
) {
$this->checkoutSession = $checkoutSession;
parent::__construct(
$context,
$registry,
$extensionFactory,
$customAttributeFactory,
$paymentData,
$scopeConfig,
$logger,
$resource,
$resourceCollection,
$data
);
}

private function startsWith($haystack, $needle) {
return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== false;
}

public function isAvailable(\Magento\Quote\Api\Data\CartInterface $quote=null)
{
if (is_null($quote) || !$this->getConfigData('active')) {
return false;
}

$shippingMethod = $this->checkoutSession->getQuote()->getShippingAddress()->getShippingMethod();

if (!$this->getConfigData('display_in_frontend')) {
return false;
}

if ($this->startsWith($shippingMethod, Carrier::CODE)
|| $this->getConfigData('ignore_shipping_method')) {

return true;
}

return false;
}

public function getInstructions()
{
return trim($this->getConfigData('instructions'));
}
}