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//
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//////////////////////////////////////////////////////////////////////////////

#pragma once

#include <cursespp/IScrollable.h>
#include <cursespp/IScrollAdapter.h>
#include <cursespp/ScrollableWindow.h>
#include <sigslot/sigslot.h>
#include <functional>

namespace cursespp {
    class ListWindow: public ScrollableWindow {
        public:
            static size_t NO_SELECTION;

            using Decorator = std::function<void(ListWindow*)>;

            sigslot::signal3<ListWindow*, size_t, size_t> SelectionChanged;
            sigslot::signal2<ListWindow*, size_t> Invalidated;
            sigslot::signal2<ListWindow*, size_t> EntryActivated;
            sigslot::signal2<ListWindow*, size_t> EntryContextMenu;

            ListWindow(std::shared_ptr<IScrollAdapter> adapter, IWindow *parent = nullptr);
            ListWindow(IWindow *parent = nullptr);

            virtual ~ListWindow();

            void ScrollToTop() override;
            void ScrollToBottom() override;
            void ScrollUp(int delta = 1) override;
            void ScrollDown(int delta = 1) override;
            void PageUp() override;
            void PageDown() override;

            void Invalidate() override;
            void OnAdapterChanged() override;

            const IScrollAdapter::ScrollPosition& GetScrollPosition() override;

            bool KeyPress(const std::string& key) override;
            bool ProcessMouseEvent(const IMouseHandler::Event& event) override;

            void SetScrollbarVisible(bool visible);
            void SetDecorator(Decorator decorator);

            /* virtual methods we define */
            virtual void ScrollTo(size_t index);
            virtual size_t GetSelectedIndex();
            virtual void SetSelectedIndex(size_t index);
            virtual bool IsEntryVisible(size_t index);

        protected:
            void OnDimensionsChanged() override;
            void DecorateFrame() override;
            IScrollAdapter::ScrollPosition& GetMutableScrollPosition() override;

            /* virtual methods we define */
            virtual void OnSelectionChanged(size_t newIndex, size_t oldIndex);
            virtual bool OnEntryActivated(size_t index);
            virtual bool OnEntryContextMenu(size_t index);
            virtual void OnInvalidated();

        private:
            bool IsSelectedItemCompletelyVisible();

            bool showScrollbar;
            IScrollAdapter::ScrollPosition scrollPosition;
            size_t selectedIndex;
            Decorator decorator;
    };
}
