@FXML
  void initialize() {
    getAllImageViewsForButtons();
    configureWidthHeightForImageViews();
    configureButtons();
    contentPane.setAlignment(Pos.CENTER);

    // show all customers and all employees
    titleLabel.setText("All Customers and All Employees");
    TableView table = new TableView();

    TableColumn fnCol = new TableColumn("First Name");
    fnCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
    TableColumn lnCol = new TableColumn("Last Name");
    lnCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    TableColumn emailCol = new TableColumn("email");
    emailCol.setCellValueFactory(new PropertyValueFactory<>("email"));

    table.getColumns().addAll(fnCol, lnCol, emailCol);

    ObservableList<Person> data =
        FXCollections.observableArrayList(operation.getAllCustomersAndEmployees());
    table.setItems(data);
    table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
    contentPane.getChildren().add(table);
  }
  @FXML
  private void customersButtonClicked(ActionEvent event) {
    configureButtons();
    customersButton.setGraphic(customersSelectedIMV);

    // Clear old content
    contentPane.getChildren().clear();

    titleLabel.setText("Customer Information");

    ScrollPane scrollPane = new ScrollPane();

    contentPane.getChildren().add(scrollPane);

    VBox box = new VBox();
    box.setSpacing(10);
    box.setAlignment(Pos.TOP_CENTER);
    box.setPrefWidth(900);

    // set up for ALL CUSTOMERS
    Text cHeader = new Text("All Customers");
    cHeader.setFont(new Font("System", 24));

    ObservableList<Customer> data = FXCollections.observableArrayList(operation.getAllCustomers());
    TableView cTable = new TableView();

    TableColumn cfnCol = new TableColumn("First Name");
    cfnCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
    TableColumn clnCol = new TableColumn("Last Name");
    clnCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    TableColumn cEmailCol = new TableColumn("Email");
    cEmailCol.setCellValueFactory(new PropertyValueFactory<>("email"));
    TableColumn cUpdatedAtCol = new TableColumn("Updated At");
    cUpdatedAtCol.setCellValueFactory(new PropertyValueFactory<>("updatedAt"));
    TableColumn cDiscountCol = new TableColumn("Discount");
    cDiscountCol.setCellValueFactory(new PropertyValueFactory<>("discount"));

    cTable.getColumns().addAll(cfnCol, clnCol, cEmailCol, cUpdatedAtCol, cDiscountCol);
    cTable.setItems(data);
    cTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

    box.getChildren().addAll(cHeader, cTable);
    scrollPane.setContent(box);
  }
  @FXML
  private void employeesButtonClicked(ActionEvent event) {
    configureButtons();
    employeesButton.setGraphic(employeesSelectedIMV);

    // Clear old content
    contentPane.getChildren().clear();

    titleLabel.setText("Employees");

    // 2 horizontal boxes for All Employees and Employees are Customers
    HBox hbox = new HBox();
    hbox.setSpacing(5);

    // 2 vboxes for each hbox
    VBox leftBox = new VBox();
    VBox rightBox = new VBox();

    // Set up All employees
    ObservableList<Employee> data = FXCollections.observableArrayList(operation.getAllEmployees());
    TableView table = new TableView();

    // Add title for all employees
    Text leftTitle = new Text("All Employees");
    leftTitle.setFont(new Font("System", 24));

    // add left table and title to left box
    leftBox.getChildren().addAll(leftTitle, table);
    leftBox.setSpacing(5);

    TableColumn efnCol = new TableColumn("First Name");
    efnCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
    TableColumn elnCol = new TableColumn("Last Name");
    elnCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    TableColumn epositionCol = new TableColumn("Position");
    epositionCol.setCellValueFactory(new PropertyValueFactory<>("position"));
    TableColumn eemailCol = new TableColumn("Email");
    eemailCol.setCellValueFactory(new PropertyValueFactory<>("email"));
    TableColumn elastworkedCol = new TableColumn("Last Worked");
    elastworkedCol.setCellValueFactory(new PropertyValueFactory<>("lastWorked"));

    table.getColumns().addAll(efnCol, elnCol, epositionCol, eemailCol, elastworkedCol);
    table.setItems(data);
    table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

    // Set up for employees and also customers
    ObservableList<Employee> rightData =
        FXCollections.observableArrayList(operation.getEmployeesWhoAreCustomers());
    TableView rightTable = new TableView();

    // Add title for all employees
    Text rightTitle = new Text("Employees Are Customers");
    rightTitle.setFont(new Font("System", 24));

    TableColumn RfnCol = new TableColumn("First Name");
    RfnCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
    TableColumn RlnCol = new TableColumn("Last Name");
    RlnCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    TableColumn RpositionCol = new TableColumn("Position");
    RpositionCol.setCellValueFactory(new PropertyValueFactory<>("position"));
    TableColumn RemailCol = new TableColumn("Email");
    RemailCol.setCellValueFactory(new PropertyValueFactory<>("email"));
    TableColumn RlastworkedCol = new TableColumn("Last Worked");
    RlastworkedCol.setCellValueFactory(new PropertyValueFactory<>("lastWorked"));

    rightTable.getColumns().addAll(RfnCol, RlnCol, RpositionCol, RemailCol, RlastworkedCol);
    rightTable.setItems(rightData);

    // add right table to the right box
    rightBox.getChildren().addAll(rightTitle, rightTable);
    rightBox.setSpacing(5);

    hbox.getChildren().addAll(leftBox, rightBox);
    hbox.setSpacing(10);
    hbox.setAlignment(Pos.CENTER);

    // add hbox to content pane
    contentPane.getChildren().add(hbox);
  }
  @FXML
  private void reservationsButtonClicked(ActionEvent event) {
    configureButtons();
    reservationsButton.setGraphic(reservationsSelectedIMV);

    // Clear the content of contentPane
    contentPane.getChildren().clear();

    // Set title
    titleLabel.setText("Reservations");

    // Make box for weekly availability and reservations
    VBox box = new VBox();
    box.setSpacing(10);
    box.setAlignment(Pos.TOP_CENTER);
    box.setPrefWidth(900);

    // box for availability
    VBox abox = new VBox();
    box.setSpacing(10);
    box.setAlignment(Pos.TOP_CENTER);
    box.setPrefWidth(900);

    // box for reservations
    VBox resbox = new VBox();
    box.setSpacing(10);
    box.setAlignment(Pos.TOP_CENTER);
    box.setPrefWidth(900);

    // set up for weekly table availability
    Text aHeader = new Text("Tables still available");
    aHeader.setFont(new Font("System", 24));

    TableView aTable = new TableView();
    TableColumn aDateCol = new TableColumn("Date");
    aDateCol.setCellValueFactory(new PropertyValueFactory<>("date"));
    TableColumn tablesCol = new TableColumn("Tables Available");
    tablesCol.setCellValueFactory(new PropertyValueFactory<>("tablesAvailable"));

    // add table and title to availability box
    abox.getChildren().addAll(aHeader, aTable);
    abox.setSpacing(5);

    // set width for all cols
    aDateCol.setMinWidth(100);
    tablesCol.setMinWidth(100);

    aTable.getColumns().addAll(aDateCol, tablesCol);
    // Populate data to the table view
    operation.callDates();
    ObservableList<Availability> adata =
        FXCollections.observableArrayList(operation.getWeeklyAvailability());
    aTable.setItems(adata);
    aTable.setMaxHeight(235);
    aTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

    // set up for reservations
    Text resHeader = new Text("All Reservations");
    resHeader.setFont(new Font("System", 24));

    TableView resTable = new TableView();
    TableColumn firstNameCol = new TableColumn("First Name");
    firstNameCol.setCellValueFactory(new PropertyValueFactory<>("firstName"));
    TableColumn lastNameCol = new TableColumn("Last Name");
    lastNameCol.setCellValueFactory(new PropertyValueFactory<>("lastName"));
    TableColumn tidCol = new TableColumn("tID");
    tidCol.setCellValueFactory(new PropertyValueFactory<>("tID"));
    TableColumn partySizeCol = new TableColumn("Party Size");
    partySizeCol.setCellValueFactory(new PropertyValueFactory<>("partySize"));
    TableColumn seatsCol = new TableColumn("Seats");
    seatsCol.setCellValueFactory(new PropertyValueFactory<>("seats"));
    TableColumn dateCol = new TableColumn("Reservation Date");
    dateCol.setCellValueFactory(new PropertyValueFactory<>("reservationDate"));

    // set width for all cols
    firstNameCol.setMinWidth(100);
    lastNameCol.setMinWidth(100);
    tidCol.setMinWidth(100);
    partySizeCol.setMinWidth(100);
    seatsCol.setMinWidth(100);
    dateCol.setMinWidth(300);

    // add table and title to availability box
    ScrollPane scrollPane = new ScrollPane();
    scrollPane.setContent(resTable);
    scrollPane.setFitToWidth(true);
    resbox.getChildren().addAll(resHeader, scrollPane);
    resbox.setSpacing(5);

    resTable
        .getColumns()
        .addAll(firstNameCol, lastNameCol, tidCol, partySizeCol, seatsCol, dateCol);
    // Populate data to the table view
    ObservableList<ReservationInfo> resdata =
        FXCollections.observableArrayList(operation.getAllReservations());
    resTable.setItems(resdata);
    resTable.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);

    // add table view to content pane
    box.getChildren().addAll(abox, resbox);
    contentPane.getChildren().add(box);
  }