Refactor

src/checkout/Brand.java

@@ -0,0 +1,5 @@
+package checkout;
+
+public enum Brand {
+    VOLOSHKOVE_POLE
+}

src/checkout/ByBrand.java

@@ -0,0 +1,22 @@
+package checkout;
+
+public class ByBrand implements Condition {
+    Brand brand;
+
+    public ByBrand(Brand brand) {
+        setBrand(brand);
+    }
+
+    @Override
+    public boolean checkCondition(Check check) {
+        boolean marker = false;
+        for (Product p : check.getProducts()) {
+            if (p.brand == brand) marker = true;
+        }
+        return marker;
+    }
+
+    public void setBrand(Brand brand) {
+        this.brand = brand;
+    }
+}

src/checkout/ByCategory.java

@@ -0,0 +1,22 @@
+package checkout;
+
+public class ByCategory implements Condition {
+    Category category;
+
+    public ByCategory(Category category) {
+        setCategory(category);
+    }
+
+    @Override
+    public boolean checkCondition(Check check) {
+        boolean marker = false;
+        for(Product p : check.getProducts()) {
+            if (p.category == category) marker = true;
+        }
+        return marker;
+    }
+
+    public void setCategory(Category category) {
+        this.category = category;
+    }
+}

src/checkout/Check.java

@@ -1,11 +1,14 @@
 package checkout;
 
+import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.List;
 
 public class Check {
     private List<Product> products = new ArrayList<>();
     private int points = 0;
+    private int discount = 0;
+    private static LocalDate todayDate = LocalDate.now();
 
     public int getTotalCost() {
         int totalCost = 0;
@@ -15,6 +18,10 @@ public int getTotalCost() {
         return totalCost;
     }
 
+    public int getTotalCostWithDiscount() {
+        return getTotalCost() - discount/10;
+    }
+
     void addProduct(Product product) {
         products.add(product);
     }
@@ -33,4 +40,23 @@ int getCostByCategory(Category category) {
                 .mapToInt(p -> p.price)
                 .reduce(0, (a, b) -> a + b);
     }
+
+    public int getPointsForBrand(Brand brand) {
+        return products.stream()
+                .filter(p -> p.brand == brand)
+                .mapToInt(p -> p.price)
+                .reduce(0, (a,b)-> a+b);
+    }
+
+    public void addDiscount(int discount) {
+        this.discount = discount;
+    }
+
+    public List<Product> getProducts() {
+        return products;
+    }
+
+    public static LocalDate getTodayDate() {
+        return todayDate;
+    }
 }

src/checkout/CheckoutService.java

@@ -1,10 +1,15 @@
 package checkout;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class CheckoutService {
 
     private Check check;
+    private List<Offer> offers = new ArrayList<>();
 
     public void openCheck() {
+        offers = new ArrayList<>();
         check = new Check();
     }
 
@@ -16,23 +21,19 @@ public void addProduct(Product product) {
     }
 
     public Check closeCheck() {
+        useAllOffer();
         Check closedCheck = check;
         check = null;
         return closedCheck;
     }
 
+    private void useAllOffer() {
+        if(this.offers.size()!=0) this.offers.forEach(offer ->
+            offer.apply(check));
+    }
+
     public void useOffer(Offer offer) {
-        offer.apply(check);
-        if (offer instanceof FactorByCategoryOffer) {
-            FactorByCategoryOffer fbOffer = (FactorByCategoryOffer) offer;
-            int points = check.getCostByCategory(fbOffer.category);
-            check.addPoints(points * (fbOffer.factor - 1));
-        } else {
-            if (offer instanceof AnyGoodsOffer) {
-                AnyGoodsOffer agOffer = (AnyGoodsOffer) offer;
-                if (agOffer.totalCost <= check.getTotalCost())
-                    check.addPoints(agOffer.points);
-            }
-        }
+        if(check != null)
+            this.offers.add(offer);
     }
 }

src/checkout/Condition.java

@@ -0,0 +1,5 @@
+package checkout;
+
+public interface Condition {
+    boolean checkCondition(Check check);
+}

src/checkout/DiscountByBrand.java

@@ -0,0 +1,25 @@
+package checkout;
+
+public class DiscountByBrand implements Reward {
+    private double discount;
+    private Brand brand;
+
+    public DiscountByBrand(double discount, Brand brand) {
+        setBrand(brand);
+        setDiscount(discount);
+    }
+
+    @Override
+    public void apply(Check check) {
+        Double points = check.getPointsForBrand(brand) * discount * 10;
+        check.addDiscount(points.intValue());
+    }
+
+    public void setBrand(Brand brand) {
+        this.brand = brand;
+    }
+
+    public void setDiscount(double discount) {
+        this.discount = discount;
+    }
+}

src/checkout/FactorRewardByCategory.java

@@ -0,0 +1,25 @@
+package checkout;
+
+public class FactorRewardByCategory implements Reward {
+    private int factor;
+    Category category;
+
+    public FactorRewardByCategory(int factor, Category category) {
+        setCategory(category);
+        setFactor(factor);
+    }
+
+    @Override
+    public void apply(Check check) {
+        int points = check.getCostByCategory(category);
+        check.addPoints(points * (factor-1));
+    }
+
+    public void setFactor(int factor) {
+        this.factor = factor;
+    }
+
+    public void setCategory(Category category) {
+        this.category = category;
+    }
+}

src/checkout/FlatReward.java

@@ -0,0 +1,18 @@
+package checkout;
+
+public class FlatReward implements Reward {
+    private int reward;
+
+    public FlatReward (int reward) {
+        setReward(reward);
+    }
+
+    @Override
+    public void apply(Check check) {
+        check.addPoints(reward);
+    }
+
+    public void setReward(int reward) {
+        this.reward = reward;
+    }
+}