Merge branch 'client/feature-servings' into 'main'

feat(client/servings): inferring serving size from user input

Closes #72

See merge request cse1105/2025-2026/teams/csep-team-76!74

client/src/main/java/client/scenes/recipe/RecipeDetailCtrl.java

@@ -49,6 +49,8 @@ public class RecipeDetailCtrl implements LocaleAware {
 
     public Spinner<Double> scaleSpinner;
     public Label inferredKcalLabel;
+    public Spinner<Integer> servingsSpinner;
+    public Label inferredServeSizeLabel;
 
     @FXML
     private IngredientListCtrl ingredientListController;
@@ -157,7 +159,7 @@ public class RecipeDetailCtrl implements LocaleAware {
 
         // If there is a scale
         // Prevents issues from first startup
-        if (scaleSpinner.getValue() != null) {
+        if (scaleSpinner.getValue() != null && servingsSpinner.getValue() != null) {
             Double scale = scaleSpinner.getValue();
             // see impl. creates a scaled context for the recipe such that its non-scaled value is kept as a reference.
             this.recipeView = new ScalableRecipeView(recipe, scale);
@@ -167,6 +169,10 @@ public class RecipeDetailCtrl implements LocaleAware {
                             Double.isNaN(this.recipeView.scaledKcalProperty().get()) ?
                                     0.0 : this.recipeView.scaledKcalProperty().get())
                     , this.recipeView.scaledKcalProperty()));
+            recipeView.servingsProperty().set(servingsSpinner.getValue());
+            inferredServeSizeLabel.textProperty().bind(Bindings.createStringBinding(
+                    () -> String.format("Inferred size per serving: %.1f g", recipeView.servingSizeProperty().get()),
+                    recipeView.servingSizeProperty()));
             // expose the scaled view to list controllers
             this.ingredientListController.refetchFromRecipe(this.recipeView.getScaled());
             this.stepListController.refetchFromRecipe(this.recipeView.getScaled());
@@ -402,6 +408,14 @@ public class RecipeDetailCtrl implements LocaleAware {
             // triggers a UI update each time the spinner changes to a different value.
             setCurrentlyViewedRecipe(recipe);
         });
+        servingsSpinner.setValueFactory(new SpinnerValueFactory.IntegerSpinnerValueFactory(1, Integer.MAX_VALUE, 1));
+        servingsSpinner.setEditable(true);
+        servingsSpinner.valueProperty().addListener((observable, oldValue, newValue) -> {
+            if (newValue == null) {
+                return;
+            }
+            setCurrentlyViewedRecipe(recipe);
+        });
         langSelector.getItems().addAll("en", "nl", "pl", "tok");
     }
 }

client/src/main/java/client/scenes/recipe/ScalableRecipeView.java

@@ -4,15 +4,19 @@ import commons.Recipe;
 import javafx.beans.binding.Bindings;
 import javafx.beans.binding.ObjectBinding;
 import javafx.beans.property.DoubleProperty;
+import javafx.beans.property.IntegerProperty;
 import javafx.beans.property.ObjectProperty;
 import javafx.beans.property.SimpleDoubleProperty;
+import javafx.beans.property.SimpleIntegerProperty;
 import javafx.beans.property.SimpleObjectProperty;
 
 public class ScalableRecipeView {
     private final ObjectProperty<Recipe> recipe = new SimpleObjectProperty<>();
     private final ObjectProperty<Recipe> scaled = new SimpleObjectProperty<>();
     private final DoubleProperty scale = new SimpleDoubleProperty();
-    private final SimpleDoubleProperty scaledKcal = new SimpleDoubleProperty();
+    private final DoubleProperty scaledKcal = new SimpleDoubleProperty();
+    private final IntegerProperty servings = new SimpleIntegerProperty();
+    private final DoubleProperty servingSize = new SimpleDoubleProperty();
     public ScalableRecipeView(
             Recipe recipe,
             Double scale
@@ -24,10 +28,10 @@ public class ScalableRecipeView {
                 this.recipe, this.scale);
         this.scaled.bind(binding);
         this.scaledKcal.bind(Bindings.createDoubleBinding(() -> this.scaled.get().kcal(), this.scaled));
-    }
+        this.servingSize.bind(Bindings.createDoubleBinding(
-
+                () -> this.scaled.get().weight() * ( 1.0 / this.servings.get()),
-    public double getScale() {
+                this.servings)
-        return scale.get();
+        );
     }
 
     public Recipe getRecipe() {
@@ -38,23 +42,14 @@ public class ScalableRecipeView {
         return scaled.get();
     }
 
-    public double getScaledKcal() {
+    public DoubleProperty scaledKcalProperty() {
-        return scaledKcal.get();
-    }
-
-    public DoubleProperty scaleProperty() {
-        return scale;
-    }
-
-    public ObjectProperty<Recipe> scaledProperty() {
-        return scaled;
-    }
-
-    public ObjectProperty<Recipe> recipeProperty() {
-        return recipe;
-    }
-
-    public SimpleDoubleProperty scaledKcalProperty() {
         return scaledKcal;
     }
+
+    public IntegerProperty servingsProperty() {
+        return servings;
+    }
+    public DoubleProperty servingSizeProperty() {
+        return servingSize;
+    }
 }

client/src/main/resources/client/scenes/recipe/RecipeDetailView.fxml

@@ -25,11 +25,15 @@
         <Button fx:id="removeRecipeButton" mnemonicParsing="false" onAction="#removeSelectedRecipe" text="Remove Recipe" />
         <Button fx:id="printRecipeButton" mnemonicParsing="false" onAction="#printRecipe" text="Print Recipe" />
         <Button fx:id="favouriteButton" onAction="#toggleFavourite" text="☆" />
-        <Label>Scale: </Label>
-        <Spinner fx:id="scaleSpinner" />
     </HBox>
 
+    <HBox>
         <ComboBox fx:id="langSelector" onAction="#changeLanguage" />
+        <Label>Scale: </Label>
+        <Spinner fx:id="scaleSpinner" />
+        <Label>Servings: </Label>
+        <Spinner fx:id="servingsSpinner" />
+    </HBox>
 
     <!-- Ingredients -->
     <fx:include source="RecipeIngredientList.fxml" fx:id="ingredientList" />
@@ -37,5 +41,6 @@
     <!-- Preparation -->
     <fx:include source="RecipeStepList.fxml" fx:id="stepList"
                 VBox.vgrow="ALWAYS" maxWidth="Infinity" />
+    <Label fx:id="inferredServeSizeLabel" />
     <Label fx:id="inferredKcalLabel" />
 </VBox>

commons/src/main/java/commons/Recipe.java

@@ -203,7 +203,10 @@ public class Recipe {
         final double PER = 100; // Gram
         return
                 this.ingredients.stream().mapToDouble(RecipeIngredient::getKcal).sum() /
-                this.ingredients.stream().mapToDouble(RecipeIngredient::getBaseAmount).sum() * PER;
+                weight() * PER;
+    }
+    public double weight() {
+        return this.ingredients.stream().mapToDouble(RecipeIngredient::getBaseAmount).sum();
     }
 
 }