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<?xml version="1.0"?>
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">
    <route url="/V1/checkout/navs" method="POST">
        <service class="Jeasy\Common\Api\Checkout\NavsManagementInterface" method="getList"/>
        <resources>
            <resource ref="anonymous"/>
        </resources>
    </route>
</routes>

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<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Jeasy\Common\Api\Checkout\NavsManagementInterface" type="Jeasy\Common\Model\Checkout\NavsManagement" />
    <preference for="Jeasy\Common\Api\Data\Checkout\NavsInterface" type="Jeasy\Common\Model\Checkout\Navs" />
</config>

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interface Jeasy\Common\Api\Data\Checkout\NavsInterface

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class Jeasy\Common\Model\Checkout\Navs implements Jeasy\Common\Api\Data\Checkout\NavsInterface

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interface Jeasy\Common\Api\Checkout\NavsManagementInterface

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class Jeasy\Common\Model\Checkout\NavsManagement implements \Jeasy\Common\Api\Checkout\NavsManagementInterface

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<?php

namespace Jeasy\Common\Api\Checkout;


interface NavsManagementInterface
{
    /**
     * @return \Jeasy\Common\Api\Data\Checkout\NavsInterface
     */
    public function getList();
}

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<?php

namespace Jeasy\Common\Model\Checkout;


class NavsManagement implements \Jeasy\Common\Api\Checkout\NavsManagementInterface
{
    protected $scopeConfig;
    protected $priceHelper;
    protected $shippingHelper;
    protected $session;
    protected $objectManager;
    protected $dataFactory;

    protected $extraDiscountRules;


    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\Pricing\Helper\Data $priceHelper,
        \Jeasy\Shipping\Helper\Data $shippingHelper,
        \Magento\Checkout\Model\Session $session,
        \Magento\Framework\ObjectManagerInterface $objectManager,
        \Jeasy\Common\Api\Data\Checkout\NavsInterfaceFactory $dataFactory
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->priceHelper = $priceHelper;
        $this->shippingHelper = $shippingHelper;
        $this->session = $session;
        $this->objectManager = $objectManager;
        $this->dataFactory = $dataFactory;
        return $this;
    }

    public function getList()
    {
        /** @var \Jeasy\Common\Api\Data\Checkout\NavsInterface $res */
        $res = $this->dataFactory->create();
        $res->setShippingTip($this->getFreeShippingTip())
            ->setDiscountTip($this->getDiscountTip());

        return $res;
    }

    protected function getQuote()
    {
        return $this->session->getQuote();
    }


    public function getFreeShippingTip()
    {
        $quote = $this->getQuote();
        $countryId = $quote->getShippingAddress()->getCountryId();

        $setting = $this->shippingHelper->loadFreeShippingSetting($countryId);
        $allowMethods = [];     // allow free shipping methods
        foreach ($setting as $methodCode => $item) {
            if ($item['free_shipping_over'] && $item['apply_free_shipping']) {
                $allowMethods[] = $methodCode;
            }
        }

        $freeShippingOver = [
            'tablerate_bestway' => [
                'value' => $this->scopeConfig->getValue('carriers/tablerate/free_shipping_over'),
                'name'  => __(''),
            ],
            'accelerate_standard' => [
                'value' => $this->scopeConfig->getValue('carriers/accelerate/free_shipping_over'),
                'name'  => __('STANDARD'),
            ],
            'expedite_expedite' => [
                'value' => $this->scopeConfig->getValue('carriers/expedite/free_shipping_over'),
                'name'  => __('EXPRESS'),
            ],
        ];

        $baseSpread = 0;
        $name = '';
        $baseSubtotalWithDiscount = (float) $quote->getBaseSubtotalWithDiscount();

        foreach ($freeShippingOver as $key => $method) {
            if (!in_array($key, $allowMethods)) {
                continue;
            }
            $value = (float) $method['value'];
            if ($baseSubtotalWithDiscount < $value) {
                $baseSpread = $value - $baseSubtotalWithDiscount;
                $name = __($method['name']);
                break;
            }
        }

        if ($baseSpread > 0.01) {
            $spread = $this->priceHelper->currency($baseSpread, true, false);
            return sprintf(__('Spend <span class="price">%s</span> more to enjoy FREE %s SHIPPING'), $spread, $name);
        }
        return '';
    }

    public function getDiscountTip()
    {
        $quote = $this->getQuote();
        $baseSubtotal = (float) $quote->getBaseSubtotal();

        $nextDiscountPercentage = 0;
        $baseSpread = 0;
        $currentPercentage = 0;

        $extraDiscountRules = $this->_getExtraDiscountRules();
        foreach ($extraDiscountRules as $key => $extraDiscountRule) {
            if ($extraDiscountRule['low_price'] <= $baseSubtotal) {
                $currentPercentage = $extraDiscountRule['discount_percentage'];
                $highPrice = $extraDiscountRule['high_price'];
                if ($highPrice > 0.01 && $highPrice > $baseSubtotal) {
                    $baseSpread = $highPrice - $baseSubtotal;
                }

                if (isset($extraDiscountRules[$key + 1])) {
                    $nextDiscountPercentage = $extraDiscountRules[$key + 1]['discount_percentage'];
                }
            }
        }

        $tip = '';

        if ($currentPercentage) {
            $tip .= sprintf(__('You have already enjoyed EXTRA %s%% discount. '), $currentPercentage);
        }

        if ($baseSpread && $nextDiscountPercentage) {
            $spread = $this->priceHelper->currency($baseSpread, true, false);
            $tip .= sprintf(__(' Spend <span class="price">%s</span> more to enjoy Extra %s%% discount.'), $spread, $nextDiscountPercentage);
        }
        return $tip;
    }

    protected function _getExtraDiscountRules()
    {
        if ($this->extraDiscountRules === null) {
            $rules = explode(';', $this->scopeConfig->getValue('promotion/extra_discount/rule'));
            $this->extraDiscountRules = [];
            if (count($rules)) {
                foreach ($rules as $rule) {
                    $_rule = explode('|', $rule);
                    if (count($_rule) === 2) {
                        $priceRange = explode('~', $_rule[0]);
                        $discountPercentage = $_rule[1];

                        if (count($priceRange) === 2 && $discountPercentage > 0) {
                            $this->extraDiscountRules[] = [
                                'low_price' => (float) $priceRange[0],
                                'high_price'=> (float) $priceRange[1],
                                'discount_percentage' => (int) $discountPercentage,
                            ];
                        }

                    }
                }
            }
        }
        return $this->extraDiscountRules;
    }
}

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<?php

namespace Jeasy\Common\Api\Data\Checkout;

interface NavsInterface
{

    /**
     * @return mixed
     */
    public function getShippingTip();

    /**
     * @return NavsInterface
     */
    public function setShippingTip($tip);

    /**
     * @return mixed
     */
    public function getDiscountTip();

    /**
     * @return NavsInterface
     */
    public function setDiscountTip($tip);

}

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<?php

namespace Jeasy\Common\Model\Checkout;

use Magento\Framework\DataObject;
use Jeasy\Common\Api\Data\Checkout\NavsInterface;

class Navs extends DataObject implements NavsInterface
{
    public function getShippingTip()
    {
        return $this->getData('shipping_tip');
    }

    public function setShippingTip($tip)
    {
        return $this->setData('shipping_tip', $tip);
    }

    public function getDiscountTip()
    {
        return $this->getData('discount_tip');
    }

    public function setDiscountTip($tip)
    {
        return $this->setData('discount_tip', $tip);
    }
}

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php bin/magento cache:clean