From 7e5137b317968f11a6196035532c54a16961fa1e Mon Sep 17 00:00:00 2001
From: Steven Liu <z.liu-74@student.tudelft.nl>
Date: Sun, 18 Jan 2026 18:19:11 +0100
Subject: [PATCH] feat(client/kcal): ui logic for kcal eval

---
 .../client/scenes/nutrition/NutritionDetailsCtrl.java  |  2 +-
 .../java/client/scenes/recipe/RecipeDetailCtrl.java    |  9 +++++++--
 .../java/client/scenes/recipe/ScalableRecipeView.java  | 10 ++++++++++
 .../client/scenes/recipe/RecipeDetailView.fxml         |  1 +
 4 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/client/src/main/java/client/scenes/nutrition/NutritionDetailsCtrl.java b/client/src/main/java/client/scenes/nutrition/NutritionDetailsCtrl.java
index c7c968f..d8351f3 100644
--- a/client/src/main/java/client/scenes/nutrition/NutritionDetailsCtrl.java
+++ b/client/src/main/java/client/scenes/nutrition/NutritionDetailsCtrl.java
@@ -66,7 +66,7 @@ public class NutritionDetailsCtrl implements LocaleAware {
             this.proteinInputElement.textProperty().bindBidirectional(vm.proteinProperty(), new NumberStringConverter());
             this.carbInputElement.textProperty().bindBidirectional(vm.carbsProperty(), new NumberStringConverter());
             this.estimatedKcalLabel.textProperty().bind(Bindings.createStringBinding(
-                    () -> String.format("Estimated energy value: %.1f", vm.getKcal()), vm.kcalProperty()
+                    () -> String.format("Estimated energy value: %.1f kcal/100g", vm.getKcal()), vm.kcalProperty()
             ));
         });
         this.nutritionValueContainer.addEventHandler(KeyEvent.KEY_RELEASED, event -> {
diff --git a/client/src/main/java/client/scenes/recipe/RecipeDetailCtrl.java b/client/src/main/java/client/scenes/recipe/RecipeDetailCtrl.java
index d072669..5c46720 100644
--- a/client/src/main/java/client/scenes/recipe/RecipeDetailCtrl.java
+++ b/client/src/main/java/client/scenes/recipe/RecipeDetailCtrl.java
@@ -18,6 +18,8 @@ import java.nio.file.Path;
 import java.util.Optional;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
+
+import javafx.beans.binding.Bindings;
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
 import javafx.scene.control.ComboBox;
@@ -46,6 +48,7 @@ public class RecipeDetailCtrl implements LocaleAware {
     private final WebSocketDataService<Long, Recipe> webSocketDataService;
 
     public Spinner<Double> scaleSpinner;
+    public Label inferredKcalLabel;
 
     @FXML
     private IngredientListCtrl ingredientListController;
@@ -156,10 +159,12 @@ public class RecipeDetailCtrl implements LocaleAware {
         // Prevents issues from first startup
         if (scaleSpinner.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);
-
+            // TODO i18n
+            inferredKcalLabel.textProperty().bind(Bindings.createStringBinding(() ->
+                    String.format("Inferred %.1f kcal/100g for this recipe", this.recipeView.scaledKcalProperty().get())
+                    , this.recipeView.scaledKcalProperty()));
             // expose the scaled view to list controllers
             this.ingredientListController.refetchFromRecipe(this.recipeView.getScaled());
             this.stepListController.refetchFromRecipe(this.recipeView.getScaled());
diff --git a/client/src/main/java/client/scenes/recipe/ScalableRecipeView.java b/client/src/main/java/client/scenes/recipe/ScalableRecipeView.java
index db5de91..aa80a97 100644
--- a/client/src/main/java/client/scenes/recipe/ScalableRecipeView.java
+++ b/client/src/main/java/client/scenes/recipe/ScalableRecipeView.java
@@ -12,6 +12,7 @@ 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();
     public ScalableRecipeView(
             Recipe recipe,
             Double scale
@@ -22,6 +23,7 @@ public class ScalableRecipeView {
                 () -> Recipe.getScaled(this.recipe.get(), this.scale.get()),
                 this.recipe, this.scale);
         this.scaled.bind(binding);
+        this.scaledKcal.bind(Bindings.createDoubleBinding(() -> this.scaled.get().kcal(), this.scaled));
     }
 
     public double getScale() {
@@ -36,6 +38,10 @@ public class ScalableRecipeView {
         return scaled.get();
     }
 
+    public double getScaledKcal() {
+        return scaledKcal.get();
+    }
+
     public DoubleProperty scaleProperty() {
         return scale;
     }
@@ -47,4 +53,8 @@ public class ScalableRecipeView {
     public ObjectProperty<Recipe> recipeProperty() {
         return recipe;
     }
+
+    public SimpleDoubleProperty scaledKcalProperty() {
+        return scaledKcal;
+    }
 }
diff --git a/client/src/main/resources/client/scenes/recipe/RecipeDetailView.fxml b/client/src/main/resources/client/scenes/recipe/RecipeDetailView.fxml
index 127274c..0ebb01b 100644
--- a/client/src/main/resources/client/scenes/recipe/RecipeDetailView.fxml
+++ b/client/src/main/resources/client/scenes/recipe/RecipeDetailView.fxml
@@ -37,4 +37,5 @@
     <!-- Preparation -->
     <fx:include source="RecipeStepList.fxml" fx:id="stepList"
                 VBox.vgrow="ALWAYS" maxWidth="Infinity" />
+    <Label fx:id="inferredKcalLabel" />
 </VBox>