Coupon.php

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<?php
namespace Magento\SalesRule\Helper;

class Coupon extends \Magento\Framework\App\Helper\AbstractHelper
{
    const COUPON_FORMAT_ALPHANUMERIC = 'alphanum';

    const COUPON_FORMAT_ALPHABETICAL = 'alpha';

    const COUPON_FORMAT_NUMERIC = 'num';

    const COUPON_TYPE_SPECIFIC_AUTOGENERATED = 1;

    const XML_PATH_SALES_RULE_COUPON_LENGTH = 'promo/auto_generated_coupon_codes/length';

    const XML_PATH_SALES_RULE_COUPON_FORMAT = 'promo/auto_generated_coupon_codes/format';

    const XML_PATH_SALES_RULE_COUPON_PREFIX = 'promo/auto_generated_coupon_codes/prefix';

    const XML_PATH_SALES_RULE_COUPON_SUFFIX = 'promo/auto_generated_coupon_codes/suffix';

    const XML_PATH_SALES_RULE_COUPON_DASH_INTERVAL = 'promo/auto_generated_coupon_codes/dash';

    protected $_couponParameters;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        array $couponParameters
    ) {
        $this->_couponParameters = $couponParameters;
        parent::__construct($context);
    }

    public function getFormatsList()
    {
        return [
            self::COUPON_FORMAT_ALPHANUMERIC => __('Alphanumeric'),
            self::COUPON_FORMAT_ALPHABETICAL => __('Alphabetical'),
            self::COUPON_FORMAT_NUMERIC => __('Numeric')
        ];
    }

    public function getDefaultLength()
    {
        return (int)$this->scopeConfig->getValue(
            self::XML_PATH_SALES_RULE_COUPON_LENGTH,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getDefaultFormat()
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_SALES_RULE_COUPON_FORMAT,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getDefaultPrefix()
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_SALES_RULE_COUPON_PREFIX,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getDefaultSuffix()
    {
        return $this->scopeConfig->getValue(
            self::XML_PATH_SALES_RULE_COUPON_SUFFIX,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getDefaultDashInterval()
    {
        return (int)$this->scopeConfig->getValue(
            self::XML_PATH_SALES_RULE_COUPON_DASH_INTERVAL,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function getCharset($format)
    {
        return str_split($this->_couponParameters['charset'][$format]);
    }

    public function getCodeSeparator()
    {
        return $this->_couponParameters['separator'];
    }
}