JezK

Edit File: coupon-apply.php

<?php

/**
 * for coupon related API
 */
require_once __DIR__.'/../support/smart-coupons.php';

function applyCouponOnCart(WP_REST_Request $request)
{
    try
    {
        global $woocommerce;

$status         = 400;
        $failure_reason = "";

$params = $request->get_params();

$logObj           = [];
        $logObj["api"]    = "applyCouponOnCart";
        $logObj["params"] = $params;

$validateInput = validateApplyCouponApi($params);

if ($validateInput != null) {
            $response["failure_reason"] = $validateInput;
            $response["failure_code"]   = "VALIDATION_ERROR";
            $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
            $trackObject = $rzp->newTrackPluginInstrumentation();
            $properties = [
                'error' => $validateInput,
                'log'   => $logObj
            ];
            $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.validation.error', $properties);

return new WP_REST_Response($response, 400);
        }

$couponCode = sanitize_text_field($params["code"]);
        $email      = sanitize_text_field($params["email"]) ?? "";
        $orderId    = sanitize_text_field($params["order_id"]);

// initializes the session
        initCustomerSessionAndCart();

if (is_plugin_active('wt-smart-coupons-for-woocommerce/wt-smart-coupon.php')) {
            // Set current user for smart coupon plugin
            if (empty($email) === false) {
                $user = get_user_by('email', $email);
                wp_set_current_user($user->id);
            }

// Apply Smart Coupon if allowed for selected payment method (e.g., Razorpay)
            try 
			{
                smartCouponPaymentRestriction($couponCode);
			} 
			catch ( Throwable $e ) 
			{
				rzpLogError('Smart Coupon restricted by payment method  : ' . $e->getMessage());
			}
        }

// check for individual specific coupons
        // cart->apply does not enforce this
        $coupon = new WC_Coupon($couponCode);

// check the enable coupon option
        if (get_option("woocommerce_enable_coupons") === "no") {
            $response["failure_reason"] = "Coupon feature disabled";
            $response["failure_code"]   = "INVALID_COUPON";
            $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
            $trackObject = $rzp->newTrackPluginInstrumentation();
            $properties = [
                'error' => 'Coupon feature disabled',
                'log'   => $logObj
            ];
            $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.invalid.coupon', $properties);

return new WP_REST_Response($response, 400);
        }

//check woo-discount-rule plugin disabling the coupons
        if (is_plugin_active('woo-discount-rules/woo-discount-rules.php')) {
            $discountOptions = get_option('woo-discount-config-v2', []);
            if (!empty($discountOptions)) {
                $isCouponEnabled = $discountOptions['disable_coupon_when_rule_applied'];
                if ($isCouponEnabled == 'disable_coupon') {
                    $response["failure_reason"] = "Coupon feature disabled";
                    $response["failure_code"]   = "INVALID_COUPON";
                    $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

return new WP_REST_Response($response, 400);
                }
            }
        }

if (empty($coupon->get_email_restrictions()) === false) {
            if ($email == "") {
                $response["failure_reason"] = "User email is required";
                $response["failure_code"]   = "LOGIN_REQUIRED";
                $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
                $trackObject = $rzp->newTrackPluginInstrumentation();
                $properties = [
                    'error' => 'User email is required',
                    'log'   => $logObj
                ];
                $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.login.required', $properties);

return new WP_REST_Response($response, 400);
            } elseif (in_array($email, $coupon->get_email_restrictions()) === false) {
                $response["failure_reason"] = "Coupon does not exist";
                $response["failure_code"]   = "INVALID_COUPON";
                $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
                $trackObject = $rzp->newTrackPluginInstrumentation();
                $properties = [
                    'error' => 'Coupon does not exist',
                    'log'   => $logObj
                ];
                $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.invalid.coupon', $properties);

return new WP_REST_Response($response, 400);
            }
        }

// Get coupon usage limit per user
        $userLimit = $coupon->get_usage_limit_per_user();
        if (!empty($userLimit)) {
            $dataStore  = $coupon->get_data_store();
            $order      = wc_get_order($orderId);
            $usageCount = $order->get_customer_id() ? $dataStore->get_usage_by_user_id($coupon, $order->get_customer_id()) : $dataStore->get_usage_by_email($coupon, $email);

if (!empty($usageCount) && !empty($userLimit)) {
                // Calculate remaining
                $remainingCount = $userLimit - $usageCount;

if ($remainingCount <= 0) {
                    $response["failure_reason"] = "Coupon usage limit has been reached";
                    $response["failure_code"]   = "REQUIREMENT_NOT_MET";
                    $logObj["response"]         = $response;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
                    $trackObject = $rzp->newTrackPluginInstrumentation();
                    $properties = [
                        'error' => 'Coupon usage limit has been reached',
                        'log'   => $logObj
                    ];
                    $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.requirement.not.met', $properties);

return new WP_REST_Response($response, 400);
                }
            }
        }

// to clear any residual notices
        $temp = wc_print_notices(true);

WC()->cart->empty_cart();

$cart1cc = create1ccCart($orderId);

WC()->cart->remove_coupon($couponCode);

if ($cart1cc) {
            $applyCoupon = WC()->cart->add_discount($couponCode);

if ($applyCoupon === true) {
                $status = true;
            } else {
                $markup       = wc_print_notices(true);
                $errorArray   = explode("<li>", $markup);
                $errorMessage = preg_replace(
                    "/\t|\n/",
                    "",
                    strip_tags(end($errorArray))
                );
                $failureReason = html_entity_decode($errorMessage);
            }
        } else {
            $invalidCartResponse                   = [];
            $invalidCartResponse["failure_reason"] = "Invalid merchant order id";
            $invalidCartResponse["failure_code"]   = "VALIDATION_ERROR";

$logObj["response"] = $invalidCartResponse;

rzpLogError(json_encode($logObj));

$rzp = new WC_Razorpay();
            $trackObject = $rzp->newTrackPluginInstrumentation();
            $properties = [
                'error' => 'Invalid merchant order id',
                'log'   => $logObj
            ];
            $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupon.validation.error', $properties);

return new WP_REST_Response($invalidCartResponse, 400);
        }

$newAmount      = (WC()->cart->cart_contents_total + WC()->cart->tax_total) * 100;
        $discountAmount = (WC()->cart->get_cart_discount_tax_total() + WC()->cart->get_cart_discount_total()) * 100;

$couponError = getApplyCouponErrorCodes($failureReason);

$promotion                 = [];
        $promotion["code"]         = $couponCode;
        $promotion["reference_id"] = $couponCode;
        $promotion["value"]        = round($discountAmount ?? 0);
        $response["promotion"]     = $promotion;

if ($couponError["failure_reason"] === "") {
            $logObj["response"] = $response;
            rzpLogInfo(json_encode($logObj));
            return new WP_REST_Response($response, 200);
        } else {
            $logObj["response"] = array_merge($response, $couponError);
            rzpLogError(json_encode($logObj));

return new WP_REST_Response($couponError, 400);
        }
    }
    catch (Throwable $e)
    {
        $rzp = new WC_Razorpay();
        $trackObject = $rzp->newTrackPluginInstrumentation();
        $properties = [
            'error' => $e->getMessage(),
            'code'  => $e->getCode(),
            'file'  => $e->getFile(),
            'line'  => $e->getLine()
        ];
        $trackObject->rzpTrackDataLake('razorpay.1cc.apply.coupons.processing.failed', $properties);
        rzpLogError(json_encode($properties));

return new WP_REST_Response(['message' => "woocommerce server error : " . $e->getMessage()], 500);
    }
}

function getApplyCouponErrorCodes($failureMessage)
{
    $result                 = [];
    $result["failure_code"] = "REQUIREMENT_NOT_MET";

if ($failureMessage === "" || is_null($failureMessage)) {
        $result["failure_reason"] = "";
        $result["failure_code"]   = "";
    } elseif (stripos($failureMessage, "does not exist") !== false) {
        $result["failure_reason"] = "Coupon does not exist";
        $result["failure_code"]   = "INVALID_COUPON";
    } elseif (stripos($failureMessage, "coupon has expired") !== false) {
        $result["failure_reason"] = "This coupon has expired";
    } elseif (stripos($failureMessage, "minimum spend") !== false) {
        $result["failure_reason"] = "Cart is below the minimum amount";
    } elseif (stripos($failureMessage, "maximum spend") !== false) {
        $result["failure_reason"] = "Cart is above maximum allowed amount";
    } elseif (
        stripos($failureMessage, "not applicable to selected products") !==
        false
    ) {
        $result["failure_reason"] = "Required product is missing";
    } elseif (
        stripos($failureMessage, "Coupon usage limit has been reached") !==
        false
    ) {
        $result["failure_reason"] = "Coupon usage limit has been reached";
    } else {
        $result["failure_reason"] = "Coupon could not be applied";
        $result["failure_code"]   = "INVALID_COUPON";
    }

return $result;
}