// The left-hand category tree. Lane GUI.
//
// docs/03-gui-spec.md §1: All Downloads / Unfinished / Finished, then Categories and
// Queues from category.list / queue.list. Selecting a node emits the filter the table
// should apply. Per-node counts come later (they need the full task set, not just the
// filtered page).

#pragma once

#include <QHash>
#include <QJsonArray>
#include <QWidget>

#include "models/DownloadFilterProxy.hpp"

class QTreeWidget;
class QTreeWidgetItem;

namespace velox::gui {

class CategoryPanel : public QWidget {
    Q_OBJECT

  public:
    explicit CategoryPanel(QWidget *parent = nullptr);

  public slots:
    void setCategories(const QJsonArray &items);
    void setQueues(const QJsonArray &items);
    /// Per-node task counts, keyed by the node's filter. Missing keys render no count.
    void setCounts(int all, int unfinished, int finished, const QHash<QString, int> &byCategory,
                   const QHash<QString, int> &byQueue);

  signals:
    void selectionChanged(const velox::gui::TaskSelection &selection);

  private:
    QTreeWidgetItem *makeItem(QTreeWidgetItem *parent, const QString &label,
                              const TaskSelection &sel);
    void onCurrentItemChanged(QTreeWidgetItem *current);

    QTreeWidget *tree_;
    QTreeWidgetItem *categoriesRoot_;
    QTreeWidgetItem *queuesRoot_;
};

}  // namespace velox::gui