TodoFX2

package todofx.viewcontroller;

import java.net.URL;
import java.text.DateFormatSymbols;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.XYChart;
import todofx.model.Task;

/**
 * Task Statistics.
 *
 * @author ikost
 */
public class TaskStatisticsController implements Initializable {

    @FXML
    private BarChart<String, Integer> barChart;

    @FXML
    private CategoryAxis xAxis;

    private final ObservableList<String> monthNames = FXCollections.observableArrayList();

    /**
     * Initializes the controller class.
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        // Get an array with the English month names.
        String[] months = DateFormatSymbols.getInstance(Locale.ENGLISH).getMonths();
        // Convert it to a list and add it to our ObservableList of months.
        monthNames.addAll(Arrays.asList(months));

        // Assign the month names as categories for the horizontal axis.
        xAxis.setCategories(monthNames);
    }

    /**
     * Sets the tasks to show the statistics for.
     *
     * @param tasks
     */
    public void setTaskData(List<Task> tasks) {
        // Count the number of tasks expiring in a specific month.
        int[] monthCounter = new int[12];
        tasks.stream()
                .map(t -> t.getDueDate().getMonthValue() - 1)
                .forEach(month -> monthCounter[month]++);

        XYChart.Series<String, Integer> series = new XYChart.Series<>();

        // Create a XYChart.Data object for each month. Add it to the series.
        for (int i = 0; i < monthCounter.length; i++) {
            series.getData().add(new XYChart.Data<>(monthNames.get(i), monthCounter[i]));
        }

        barChart.getData().add(series);
    }

}

    /**
     * Opens a dialog to show task statistics.
     */
    public void showTaskStatistics() {
        try {
            // Load the fxml file and create a new stage for the popup.
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(getClass().getResource("viewcontroller/TaskStatistics.fxml"));
            AnchorPane page = (AnchorPane) loader.load();
            Stage dialogStage = new Stage();
            dialogStage.setTitle("Task Statistics");
            dialogStage.initModality(Modality.WINDOW_MODAL);
            dialogStage.initOwner(primaryStage);
            Scene scene = new Scene(page);
            dialogStage.setScene(scene);

            // Set the tasks into the controller.
            TaskStatisticsController controller = loader.getController();
            try {
                controller.setTaskData(TaskManagerDB.getInstance().listAllTasks(true));
            } catch (DatabaseException ex) {
                Logger.getLogger(Main.class.getName())
                      .log(Level.SEVERE, null, ex);
            }

            dialogStage.show();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * Opens the task statistics.
     */
    @FXML
    private void handleShowTaskStatistics() {
        mainApp.showTaskStatistics();
    }