refactor: first attempt at dependency injection

also some more renaming and improving date-picker dialog

src/main/java/ch/zhaw/gartenverwaltung/MainFXMLController.java

@@ -1,17 +1,35 @@
 package ch.zhaw.gartenverwaltung;
 
+import ch.zhaw.gartenverwaltung.io.CropList;
+import ch.zhaw.gartenverwaltung.io.JsonCropList;
+import ch.zhaw.gartenverwaltung.io.JsonPlantList;
+import ch.zhaw.gartenverwaltung.io.JsonTaskList;
+import ch.zhaw.gartenverwaltung.io.PlantList;
+import ch.zhaw.gartenverwaltung.io.TaskList;
+import ch.zhaw.gartenverwaltung.models.Garden;
+import ch.zhaw.gartenverwaltung.models.GardenSchedule;
+import ch.zhaw.gartenverwaltung.models.PlantListModel;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.fxml.FXMLLoader;
 import javafx.fxml.Initializable;
+import javafx.scene.Scene;
 import javafx.scene.control.Button;
 import javafx.scene.layout.AnchorPane;
+import javafx.scene.layout.Pane;
+import javafx.stage.Stage;
 
 import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.net.URL;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.ResourceBundle;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -20,9 +38,16 @@ public class MainFXMLController implements Initializable {
     /**
      * Caching the panes
      */
-    private final Map<String, AnchorPane> panes = new HashMap<>();
+    private final Map<String, Pane> panes = new HashMap<>();
     private static final Logger LOG = Logger.getLogger(MainFXMLController.class.getName());
 
+    private final PlantList plantList = new JsonPlantList();
+    private final CropList cropList = new JsonCropList();
+    private final TaskList taskList = new JsonTaskList();
+
+    private final GardenSchedule gardenSchedule = new GardenSchedule(taskList, plantList);
+    private final Garden garden = new Garden(gardenSchedule, cropList);
+
     @FXML
     private Button home_button;
 
@@ -30,7 +55,7 @@ public class MainFXMLController implements Initializable {
     private AnchorPane mainPane;
 
     @FXML
-    private Button myPlants_button;
+    private Button myGarden_button;
 
     @FXML
     private Button mySchedule_button;
@@ -38,27 +63,30 @@ public class MainFXMLController implements Initializable {
     @FXML
     private Button plants_button;
 
+    public MainFXMLController() throws IOException {
+    }
+
     @FXML
     void goToHome(ActionEvent event) throws IOException {
-        loadPane("Home.fxml");
+        showPaneAsMainView("Home.fxml");
         styleChangeButton(home_button);
     }
 
     @FXML
     void goToMyPlants(ActionEvent event) throws IOException {
-        loadPane("MyPlants.fxml");
-        styleChangeButton(myPlants_button);
+        showPaneAsMainView("MyGarden.fxml");
+        styleChangeButton(myGarden_button);
     }
 
     @FXML
     void goToMySchedule(ActionEvent event) throws IOException {
-        loadPane("MySchedule.fxml");
+        showPaneAsMainView("MySchedule.fxml");
         styleChangeButton(mySchedule_button);
     }
 
     @FXML
     void goToPlants(ActionEvent event) throws IOException {
-        loadPane("Plants.fxml");
+        showPaneAsMainView("Plants.fxml");
         styleChangeButton(plants_button);
     }
 
@@ -69,23 +97,68 @@ public class MainFXMLController implements Initializable {
      * @param fxmlFile string of fxml file
      * @throws IOException exception when file does not exist
      */
-    public void loadPane(String fxmlFile) throws IOException {
-
-        AnchorPane anchorPane = panes.get(fxmlFile);
+    public void showPaneAsMainView(String fxmlFile) throws IOException {
+        Pane anchorPane = panes.get(fxmlFile);
         if (anchorPane == null) {
-            FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
-            anchorPane = loader.load();
-            panes.put(fxmlFile, anchorPane);
-
-            if(fxmlFile.equals("MyPlants.fxml")) {
-                MyPlantsController myPlantsController = loader.getController();
-                myPlantsController.getMainController(this);
-            }
+            loadAndCacheFxml(fxmlFile);
+            anchorPane = panes.get(fxmlFile);
         }
         mainPane.getChildren().setAll(anchorPane);
         anchorPane.prefWidthProperty().bind(mainPane.widthProperty());
         anchorPane.prefHeightProperty().bind(mainPane.heightProperty());
+    }
 
+    public Object loadSceneToStage(String fxmlFile, Stage appendee) throws IOException {
+        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+        Pane root = loader.load();
+        appendee.setScene(new Scene(root));
+        Object controller = loader.getController();
+        injectDependencies(controller);
+        return controller;
+    }
+
+    public FXMLLoader loadAndCacheFxml(String fxmlFile) throws IOException {
+        FXMLLoader loader = new FXMLLoader(Objects.requireNonNull(HelloApplication.class.getResource(fxmlFile)));
+        AnchorPane anchorPane = loader.load();
+        panes.put(fxmlFile, anchorPane);
+        injectDependencies(loader.getController());
+        return loader;
+    }
+
+    public void injectDependencies(Object controller) {
+        Optional<Method> injectMethod = Arrays.stream(controller.getClass().getMethods())
+                .filter(method -> method.getName().equals("injectDependencies") )
+                .findFirst();
+        if (injectMethod.isPresent()) {
+            Method injectee = injectMethod.get();
+
+            List<Object> params = new ArrayList<>();
+            for (Class<?> parameterType : injectee.getParameterTypes()) {
+                Object toInject = switch (parameterType.getSimpleName()) {
+                    case "Garden" -> garden;
+                    case "PlantList" -> plantList;
+                    case "PlantListModel" -> new PlantListModel(plantList);
+                    case "GardenSchedule" -> gardenSchedule;
+                    case "MainFXMLController" -> this;
+                    default -> null;
+                };
+                if (toInject != null) {
+                    params.add(toInject);
+                }
+            }
+            try {
+                injectee.invoke(controller, params.toArray());
+            } catch (IllegalAccessException | InvocationTargetException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+
+    private void preloadPanes() throws IOException {
+        loadAndCacheFxml("MyGarden.fxml");
+        loadAndCacheFxml("MySchedule.fxml");
+        loadAndCacheFxml("Plants.fxml").getController();
     }
 
     private void styleChangeButton(Button button) {
@@ -99,7 +172,8 @@ public class MainFXMLController implements Initializable {
     @Override
     public void initialize(URL url, ResourceBundle resourceBundle) {
         try {
-            loadPane("Home.fxml");
+            preloadPanes();
+            showPaneAsMainView("Home.fxml");
             styleChangeButton(home_button);
         } catch (IOException e) {
             LOG.log(Level.SEVERE, "Failed to load FXML-Pane!", e);