class AmazonMiddleware
{
    /**
     * Amazon Pay module object
     *
     * @var AmazonPay
     */
    private $module;

    /**
     * Instantiates middleware
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param AmazonPay $module
     */
    public function __construct(AmazonPay $module) {
        $this->module = $module;
    }

    /**
     * Sets `$_POST['offer']['payment_name']` to Amazon Pay payment method name
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return Closure&#Function#cececce
     */
    public function setPaymentMethodToAmazonPay() {
        return function () {
            $_POST['offer']['payment_name'] = $this->module->getPaymentNameByActingFlag();
        };
    }

    /**
     * Clears `$_SESSION['usces_entry']['delivery']`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return Closure&#Function#86f215e4
     */
    public function payOnlyClearDeliverySession() {
        return function () {
            unset($_SESSION['usces_entry']['delivery']);
        };
    }

    /**
     * Puts checkout session response in `$_SESSION`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return Closure&#Function#7a371dcb
     */
    public function putGetCheckoutSessionResponseInSession() {
        return function () {
            $sessionId = $_REQUEST['amazonCheckoutSessionId'];
            $result = (new CheckoutSession\Get($this->module))->get($sessionId);
            $response = json_decode($result['response'], true);
            $_SESSION['amazonCheckoutSession'] = $response;
            $_SESSION['amazonCheckoutSessionId'] = $sessionId;
        };
    }

    /**
     * Populate Welcart `$_POST['customer']` with Amazon checkout session data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $payandship
     * @return Closure&#Function#28b01377
     */
    public function setCustomerDataWithCheckoutSession($payandship) {
        return function () use ($payandship) {
            if (!usces_is_login()) {
                $response = $_SESSION['amazonCheckoutSession'];
                $fullname = explode(' ', $response['buyer']['name']);
                $name1 = $fullname[0];
                $name2 = isset($fullname[1]) ? join(' ', array_slice($fullname, 1)) : '';

                $entries = isset($_SESSION['usces_entry']) ? $_SESSION['usces_entry'] : [];
                $_POST['customer'] = isset($entries['customer']) ? $entries['customer'] : [];
                $customer = [];
                $customer['name1'] = $name1;
                $customer['name2'] = $name2;
                $customer['mailaddress1'] = $response['buyer']['email'];
                $customer['mailaddress2'] = $response['buyer']['email'];

                $opts = $this->module->getActingOpts();
                if ($opts['quickpay_default_customer_address_details'] === 'on' && $payandship === true) {
                    $delivery = $this->getDeliveryAddressFromCheckoutSession($response);
                    $customer['country'] = $delivery['country'];
                    $customer['fax'] = $delivery['fax'];
                    $customer['pref'] = $delivery['pref'];
                    $customer['tel'] = $delivery['tel'];
                    $customer['zipcode'] = $delivery['zipcode'];
                    $customer['address1'] = $delivery['address1'];
                    $customer['address2'] = $delivery['address2'];
                    $customer['address3'] = $delivery['address3'];
                }

                $_POST['customer'] = $customer;
            }
        };
    }

    /**
     * Populate Welcart `$_POST['delivery']` with Amazon checkout session data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param bool $clearExisting `true` if `$_SESSION['usces_entry']['delivery']` should be cleared, `false` otherwise.
     *             Default: `false`
     * @return Closure&#Function#3fcb4e59
     */
    public function setDeliveryDataWithCheckoutSession($clearExisting = false) {
        return function () use ($clearExisting) {
            if ($clearExisting === true) {
                unset($_SESSION['usces_entry']['delivery']);
            }
            $response = $_SESSION['amazonCheckoutSession'];
            $_POST['delivery'] = $this->getDeliveryAddressFromCheckoutSession($response);
        };
    }

    /**
     * Returns delivery address parsed from an Amazon Checkout Session
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $checkoutSession
     * @return array
     */
    public function getDeliveryAddressFromCheckoutSession($checkoutSession) {
        $opts = $this->module->getActingOpts();
        $sandbox = $opts['sandbox'];
        $address = $checkoutSession['shippingAddress'];
        $pref = $address['stateOrRegion'];
        $deliveryFullname = explode(' ', $address['name']);
        $deliveryName1 = $deliveryFullname[0];
        $deliveryName2 = isset($deliveryFullname[1]) ? join(' ', array_slice($deliveryFullname, 1)) : '';

        // set flag to 1 because address is pulled from Amazon account
        $delivery = [];
        $delivery['delivery_flag'] = 1;
        $delivery['name1'] = $deliveryName1;
        $delivery['name2'] = $deliveryName2;
        $delivery['name3'] = '';
        $delivery['name4'] = '';
        $delivery['country'] = $address['countryCode'];
        $delivery['fax'] = '';
        $delivery['pref'] = $pref;
        $delivery['tel'] = $address['phoneNumber'];
        $delivery['zipcode'] = $address['postalCode'];
        $delivery['address1'] = $sandbox ? $address['city'] . $address['addressLine1'] : $address['addressLine1'];
        $delivery['address2'] = $address['addressLine2'];
        $delivery['address3'] = $address['addressLine3'];
        // make sure Japanese prefecture name is converted to Japanese if it is in English
        if ($delivery['country'] === 'JP') {
            if (array_key_exists($delivery['pref'], Constants::ETOJ_PREF_MAP) === true) {
                $delivery['pref'] = Constants::ETOJ_PREF_MAP[$delivery['pref']];
            }
        } elseif ($delivery['country'] === 'US') {
            $states = get_option('usces_states');
            if (!in_array($delivery['pref'], $states, true)) {
                if (array_key_exists($delivery['pref'], Constants::ISO_US_STATE_CODE_MAP) === true) {
                    $delivery['pref'] = Constants::ISO_US_STATE_CODE_MAP[$delivery['pref']];
                }
            }
        }

        return $delivery;
    }
}