#pragma once

#include <LibGUI/GModel.h>

class GSortingProxyModel final : public GModel {
public:
    static Retained<GSortingProxyModel> create(Retained<GModel>&& model) { return adopt(*new GSortingProxyModel(move(model))); }
    virtual ~GSortingProxyModel() override;

    virtual int row_count(const GModelIndex& = GModelIndex()) const override;
    virtual int column_count(const GModelIndex& = GModelIndex()) const override;
    virtual String row_name(int) const override;
    virtual String column_name(int) const override;
    virtual ColumnMetadata column_metadata(int) const override;
    virtual GVariant data(const GModelIndex&, Role = Role::Display) const override;
    virtual void update() override;

    virtual int key_column() const override { return m_key_column; }
    virtual GSortOrder sort_order() const override { return m_sort_order; }
    virtual void set_key_column_and_sort_order(int, GSortOrder) override;

    GModelIndex map_to_target(const GModelIndex&) const;

private:
    explicit GSortingProxyModel(Retained<GModel>&&);

    GModel& target() { return *m_target; }
    const GModel& target() const { return *m_target; }

    void resort();

    Retained<GModel> m_target;
    Vector<int> m_row_mappings;
    int m_key_column { -1 };
    GSortOrder m_sort_order { GSortOrder::Ascending };
};