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app/code/Magezon/QuickOrder/Helper/Data.php

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+<?php
+/**
+ * Magezon
+ *
+ * This source file is subject to the Magezon Software License, which is available at https://magezon.com/license/.
+ * Do not edit or add to this file if you wish to upgrade the to newer versions in the future.
+ * If you wish to customize this module for your needs.
+ * Please refer to https://www.magezon.com for more information.
+ *
+ * @category  Magezon
+ * @package   Magezon_QuickOrder
+ * @copyright Copyright (C) 2018 Magezon (https://magezon.com)
+ */
+
+namespace Magezon\QuickOrder\Helper;
+
+class Data extends \Magento\Framework\App\Helper\AbstractHelper
+{
+    /**
+     * @var \Magento\Store\Model\StoreManagerInterface
+     */
+    protected $storeManager;
+
+    /**
+     * @var \Magento\Customer\Model\Session
+     */
+    protected $customerSession;
+
+    /**
+     * @param \Magento\Framework\App\Helper\Context      $context         
+     * @param \Magento\Store\Model\StoreManagerInterface $storeManager    
+     * @param \Magento\Customer\Model\Session            $customerSession 
+     */
+    public function __construct(
+        \Magento\Framework\App\Helper\Context $context,
+        \Magento\Store\Model\StoreManagerInterface $storeManager,
+        \Magento\Customer\Model\Session $customerSession
+    ) {
+        parent::__construct($context);
+        $this->storeManager    = $storeManager;
+        $this->customerSession = $customerSession;
+    }
+   
+    /**
+     * @param  string $key
+     * @param  null|int $store
+     * @return null|string
+     */
+    public function getConfig($key, $store = null)
+    {
+		$store     = $this->storeManager->getStore($store);
+		$websiteId = $store->getWebsiteId();
+        $result = $this->scopeConfig->getValue(
+            'quickorder/' . $key,
+            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
+            $store);
+        return $result;
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isEnabled()
+    {
+        return $this->getConfig('general/enabled');
+    }
+
+    /**
+     * @return string
+     */
+    public function getTitle()
+    {
+        return $this->getConfig('general/title');   
+    }
+
+    /**
+     * @return boolean
+     */
+    public function isGroupValid()
+    {
+        if ($this->getConfig('general/customer_groups')) {
+            $customerGroupId = $this->customerSession->getCustomer()->getGroupId();
+            $customerGroups  = explode(',', $this->getConfig('general/customer_groups'));
+            return in_array($customerGroupId, $customerGroups);
+        }
+        return true;
+    }
+}