Made FinanceController abstract. Defined common methods

src/main/java/no/ntnu/idatt1002/demo/controller/FinanceController.java

@@ -2,8 +2,19 @@ package no.ntnu.idatt1002.demo.controller;
 
 import java.awt.event.ActionEvent;
 import java.io.IOException;
+import java.time.LocalDate;
 import java.util.Optional;
+import javafx.collections.ObservableList;
+import javafx.scene.chart.PieChart;
+import javafx.scene.chart.PieChart.Data;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
 import javafx.scene.control.ButtonType;
+import no.ntnu.idatt1002.demo.data.Budget.FileHandlingBudget;
+import no.ntnu.idatt1002.demo.data.Budget.GeneralBudget;
+import no.ntnu.idatt1002.demo.data.Economics.ExpenseRegister;
+import no.ntnu.idatt1002.demo.data.Economics.FileHandling;
+import no.ntnu.idatt1002.demo.data.Economics.IncomeRegister;
 
 /**
  * Interface for controllers for scenes with finance tableviews.
@@ -11,48 +22,141 @@ import javafx.scene.control.ButtonType;
  * @author Harry Linrui Xu
  * @since 29.3.2023
  */
-public interface FinanceController {
+public abstract class FinanceController {
 
+  private ExpenseRegister expenseRegister;
+
+  private IncomeRegister incomeRegister;
+
+  private GeneralBudget general;
 
   /**
    * Method for handling the adding of new entries in the tableview.
    * @param event A button click on the add button.
    */
-  void handleAddBtn(javafx.event.ActionEvent event);
+  abstract void handleAddBtn(javafx.event.ActionEvent event);
 
   /**
    * Method for handling the editing of a chosen entry in the tableview.
    * @param event A button click on the edit button.
    */
-  void handleEditBtn(javafx.event.ActionEvent event);
+  abstract void handleEditBtn(javafx.event.ActionEvent event);
 
   /**
    * Deletes an entry from the tableview, if an entry has been selected. The method brings up a popup window, asking for confirmation for deleting the entry.
    * @param event A button click on the delete button
    */
-  void handleDeleteBtn(javafx.event.ActionEvent event);
+  abstract void handleDeleteBtn(javafx.event.ActionEvent event);
 
   /**
    * Method for synching the register with the tableview. The observable list to which the tableview is set, is being refilled with all the entries
    * in the register, keeping it updated with new changes.
    */
-  void refreshTableView();
+  abstract void refreshTableView();
 
   /**
    * Returns an optional, which is a popup alert box, asking for confirmation for deleting an entry.
    * @return An alert box, asking for confirmation for deleting the selected entry of the tableview.
    */
-  Optional<ButtonType> showConfirmationDialog(String title, String header, String content);
+  public Optional<ButtonType> showConfirmationDialog(String title, String header, String content) {
+    Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
+    alert.setTitle(title);
+    alert.setHeaderText(header);
+    alert.setContentText(content);
+
+    return alert.showAndWait();
+  }
+
+  abstract void refreshPieChart();
+
+  /**
+   * Method for disabling the date picker, yet having its opacity at max.
+   */
+  abstract void formatDatePicker();
+
+  /**
+   * Displays an alert box of type error, informing of a custom error.
+   */
+  public void showErrorDialogBox(String title, String header, String content) {
+    Alert alert = new Alert(AlertType.ERROR);
+    alert.setTitle(title);
+    alert.setHeaderText(header);
+    alert.setContentText(content);
+    alert.showAndWait();
+  }
+
+  /**
+   * Method that either reads data from a file with which it fills a budget register, if this is an old budget, or instantiates a budget register if this is a new budget.
+   * @param fileName The name of the file that is being read from.
+   * @return An object of type GeneralBudget.
+   * @throws IOException If an error occurs while reading from the file.
+   */
+  public GeneralBudget loadBudgetDataFromFile(String fileName) throws IOException {
+    //Instantiate new budget
+    if (FileHandlingBudget.isEmpty(fileName)) {
+      general = new GeneralBudget(1000);
+      //throws new IOException("Not valid budget")
+    } else { //Load previous budget
+      try {
+        general = FileHandlingBudget.readGeneralBudgetFromFile(fileName);
+      } catch (IOException e) {
+        showErrorDialogBox("File error", "Error in reading from fil", "An error occurred"
+            + "when reading GeneralBudget from the file");
+      }
+    }
+    return general;
+  }
+
+  /**
+   * Method that either reads data from a file with which it fills an income register, if older changes exist, or instantiates an income register if the file is empty.
+   * @param fileName The name of the file that is being read from.
+   * @return An object of type IncomeRegister.
+   */
+  public IncomeRegister loadIncomeDataFromFile(String fileName)  {
+    //Instantiate new incomeRegister
+    try {
+      if (FileHandling.isEmpty(fileName)) {
+        incomeRegister = new IncomeRegister();
+      } else { //Load previous income register
+        incomeRegister = FileHandling.readIncomeRegisterFromFile(fileName);
+      }
+    } catch (IOException ioe) {
+      showErrorDialogBox("File reading error", "Error in reading from file", "Could not"
+          + "read the IncomeRegister from file");
+    }
+    return incomeRegister;
+  }
+
+  /**
+   * Method that either reads data from a file with which it fills an expense register, if older changes exist, or instantiates an expense register if the file is empty.
+   * @param fileName The name of the file that is being read from.
+   * @return An object of type IncomeRegister.
+   */
+  public ExpenseRegister loadExpenseDataFromFile(String fileName) {
+    //Instantiate expense register
+    try {
+      if (FileHandling.isEmpty(fileName)) {
+        expenseRegister = new ExpenseRegister();
+      } else { //Load previous income register
+        expenseRegister = FileHandling.readExpenseRegisterFromFile(fileName);
+      }
+    } catch (IOException ioe) {
+      showErrorDialogBox("File reading error", "Error in reading from file", "Could not"
+          + "read the ExpenseRegister from file");
+    }
+    return expenseRegister;
+  }
+
 
   /**
    * Saves the changes made to the tableview by writing the information to a file.
    * @throws IOException If an error occurs while writing to the file.
    */
-  void saveDataToFile() throws IOException;
+  abstract void saveDataToFile() throws IOException;
 
   /**
    * Switches scenes, by loading a new FXML file and setting the scene to this location.
    * @param event A button click on the return to main menu button
    */
-  void switchScene(javafx.event.ActionEvent event);
+  abstract void switchScene(javafx.event.ActionEvent event);
 }