delete tasks

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

@@ -218,6 +218,7 @@ public class CropDetailController {
         setIconToButton(edit, "editIcon.png");
         setIconToButton(delete, "deleteIcon.png");
         edit.setOnAction(getEditTaskEvent(task));
+        delete.setOnAction(deleteTask(task));
 
         hBox.getChildren().addAll(taskName, taskDescription, edit, delete);
         return hBox;
@@ -260,6 +261,12 @@ public class CropDetailController {
         };
     }
 
+    private EventHandler<ActionEvent> deleteTask(Task task) {
+        return (event) -> {
+            showDeleteTask(task);
+        };
+    }
+
     private void createTaskDialog(boolean newTask, Task givenTask) throws IOException {
         Dialog<Task> dialog = new Dialog<>();
         dialog.setTitle("Set Task");
@@ -332,4 +339,23 @@ public class CropDetailController {
                     });
         }
     }
+
+    private void showDeleteTask(Task task) {
+        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
+        alert.setTitle("Delete " + task.getName());
+        alert.setHeaderText("Are you sure want to delete this Task?");
+
+        alert.showAndWait()
+                .ifPresent(buttonType -> {
+                    if (buttonType == ButtonType.OK) {
+                        try {
+                            gardenSchedule.removeTask(task);
+                            setTaskListProperty(this.crop);
+                        } catch (IOException e) {
+                            // TODO: Show error alert
+                            LOG.log(Level.SEVERE, "Could not remove crop.", e);
+                        }
+                    }
+                });
+    }
 }

src/main/java/ch/zhaw/gartenverwaltung/types/TaskTemplate.java

@@ -48,6 +48,10 @@ public class TaskTemplate {
     public Task generateTask(LocalDate realStartDate, long cropId) {
         LocalDate endDate = relativeEndDate != null ? realStartDate.plusDays(relativeEndDate) : null;
 
+        if (interval == null) {
+            this.interval = 0;
+        }
+
         return new Task(name, description, realStartDate.plusDays(relativeStartDate), cropId)
                 .withInterval(interval)
                 .withEndDate(endDate);