add redeemed coupons api

Author: ajungg

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog  
 All notable changes to this project will be documented in this file.
 
+## [0.45.0]
+
+### Added
+- Added API to get redeemed coupons 
+
 ## [0.44.4]
 
 ### Added 

core/src/main/java/io/snabble/sdk/Checkout.java

@@ -1,5 +1,7 @@
 package io.snabble.sdk;
 
+import androidx.annotation.NonNull;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -129,6 +131,7 @@ public enum State {
     private final PaymentOriginCandidateHelper paymentOriginCandidateHelper;
     private CheckoutApi.AuthorizePaymentRequest storedAuthorizePaymentRequest;
     private boolean authorizePaymentRequestFailed;
+    private List<Coupon> redeemedCoupons;
 
     Checkout(Project project) {
         this.project = project;
@@ -271,6 +274,7 @@ public void checkout(long timeout) {
         storedAuthorizePaymentRequest = null;
         shop = project.getCheckedInShop();
         paymentOriginCandidateHelper.reset();
+        redeemedCoupons = null;
 
         notifyStateChanged(Checkout.State.HANDSHAKING);
 
@@ -663,6 +667,7 @@ private void approve() {
                 shoppingCart.backup();
             }
 
+            redeemedCoupons = signedCheckoutInfo.getRedeemedCoupons(project.getCoupons().get());
             shoppingCart.invalidate();
             clearCodes();
             notifyStateChanged(Checkout.State.PAYMENT_APPROVED);
@@ -671,6 +676,15 @@ private void approve() {
         }
     }
 
+    @NonNull
+    public List<Coupon> getRedeemedCoupons() {
+        if (redeemedCoupons == null) {
+            return new ArrayList<>();
+        }
+
+        return redeemedCoupons;
+    }
+
     public void approveOfflineMethod() {
         if (paymentMethod != null && paymentMethod.isOfflineMethod()
          || paymentMethod == PaymentMethod.CUSTOMERCARD_POS) {

core/src/main/java/io/snabble/sdk/CheckoutApi.java

@@ -106,6 +106,29 @@ public PaymentMethodInfo[] getAvailablePaymentMethods(PaymentMethod[] clientAcce
 
             return new PaymentMethodInfo[0];
         }
+
+        public List<Coupon> getRedeemedCoupons(List<Coupon> availableCoupons) {
+            ArrayList<Coupon> redeemedCoupons = new ArrayList<>();
+
+            if (checkoutInfo != null && checkoutInfo.has("lineItems")) {
+                JsonArray jsonArray = checkoutInfo.getAsJsonArray("lineItems");
+                if (jsonArray != null) {
+                    List<LineItem> lineItems = new Gson().fromJson(jsonArray,
+                            new TypeToken<List<LineItem>>() {}.getType());
+                    for (LineItem lineItem : lineItems) {
+                        if (lineItem.type == LineItemType.COUPON && lineItem.redeemed) {
+                            for (Coupon coupon : availableCoupons) {
+                                if (coupon.getId().equals(lineItem.couponId)) {
+                                    redeemedCoupons.add(coupon);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            return redeemedCoupons;
+        }
     }
 
     public static class CheckoutInfo {