@Named
@ViewScoped
public class KanbanController implements Serializable {

    private static final long serialVersionUID = 1L;

    private List<KanbanColumn> columns;

    @PostConstruct
    public void init() {
        columns = new ArrayList<>();

        KanbanColumn todoColumn = new KanbanColumn("todo", "To Do");
        todoColumn.setCssClass("kanban-todo");
        todoColumn.addItem(new KanbanItem("item1", "Add support for Kanban",
                    "Create a new Kanban component for PrimeFaces Extensions"));
        todoColumn.addItem(new KanbanItem("item2", "Write documentation",
                    "Document the new component"));

        KanbanColumn inProgressColumn = new KanbanColumn("inprogress", "In Progress");
        inProgressColumn.setCssClass("kanban-inprogress");
        inProgressColumn.addItem(new KanbanItem("item3", "Design component",
                    "Design the Kanban board component"));

        KanbanColumn doneColumn = new KanbanColumn("done", "Done");
        doneColumn.setCssClass("kanban-done");
        doneColumn.addItem(new KanbanItem("item4", "Research libraries",
                    "Research available Kanban libraries"));

        columns.add(todoColumn);
        columns.add(inProgressColumn);
        columns.add(doneColumn);
    }

    public void onDrop(KanbanDragEvent event) {
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Item Moved",
                    "Item " + event.getItemId() + " moved from " + event.getSourceColumnId()
                                + " to " + event.getTargetColumnId() + " at position " + event.getNewPosition());
        FacesContext.getCurrentInstance().addMessage(null, message);
    }

    public void onAddItem(KanbanAddEvent event) {
        for (KanbanColumn column : columns) {
            if (column.getId().equals(event.getColumnId())) {
                int count = column.getItems().size() + 1;
                column.addItem(new KanbanItem("new-" + count, "New Task " + count,
                            "Click to edit this task"));
                break;
            }
        }
        FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_INFO, "Item Added",
                    "New item added to column " + event.getColumnId());
        FacesContext.getCurrentInstance().addMessage(null, message);
    }

    public List<KanbanColumn> getColumns() {
        return columns;
    }

    public void setColumns(List<KanbanColumn> columns) {
        this.columns = columns;
    }
}