/*
 * BoxLayout.hpp
 *
 *  Created on: 16 maj 2019
 *      Author: robert
 */

#ifndef GUI_WIDGETS_BOXLAYOUT_HPP_
#define GUI_WIDGETS_BOXLAYOUT_HPP_

#include <cstdint>

#include "Layout.hpp"
#include "Rect.hpp"
#include <Alignment.hpp>

namespace gui
{

    class BoxLayout : public Rect
    {
      protected:
        struct BoxElement
        {
            BoxElement(Item *item) : item{item}, noUpdate{false} {};
            Item *item;
            bool noUpdate;
        };

        template <Axis axis> uint16_t &size(Item *it)
        {
            return it->widgetArea.size(axis);
        };
        template <Axis axis> uint32_t sizeUsed(Item *it, Item::Area area = Item::Area::Normal)
        {
            uint32_t sum = 0;
            std::for_each(it->children.begin(), it->children.end(), [&](auto &el) {
                sum += el->visible ? el->area(area).size(axis) : 0;
            });
            return sum;
        };
        template <Axis axis> uint32_t sizeLeft(Item *it, Item::Area area = Item::Area::Normal)
        {
            return size<axis>(it) - sizeUsed<axis>(it, area);
        };

        template <Axis axis> void resizeItems();

        virtual void resizeItems();
        bool reverse_order = false;
        /// get next navigation item including `from` item, ecludes not visible items and not acvite items
        std::list<Item *>::iterator nextNavigationItem(std::list<Item *>::iterator from);

      public:
        BoxLayout();
        BoxLayout(Item *parent, const uint32_t &x, const uint32_t &y, const uint32_t &w, const uint32_t &h);
        bool onInput(const InputEvent &inputEvent) override;
        virtual bool onFocus(bool state) override;
        virtual ~BoxLayout() = default;

        // virtual methods from Item
        void setPosition(const short &x, const short &y) override;
        void setSize(const unsigned short w, const unsigned short h) override;
        void addWidget(gui::Item *item) override;
        bool removeWidget(Item *item) override;
        std::list<DrawCommand *> buildDrawList() override;
        /// add item if it will fit in box, return true on success
        /// axis sets direction to define space left in container
        template <Axis axis> void addWidget(Item *item);
        /// set navigation from last to fist element in box
        virtual void setNavigation();
        void setVisible(bool value) override;
        /// set visible but from previous scope... (page, element etc)
        void setVisible(bool value, bool previous);
        void setReverseOrder(bool reverse_order)
        {
            this->reverse_order = reverse_order;
            resizeItems();
        }
        /// callback for situaton when we reached top/bottom/left/right of box
        /// if we want to do sth special (i.e. request new items)
        std::function<bool(const InputEvent &inputEvent)> borderCallback = nullptr;
    };

    class HBox : public BoxLayout
    {
      public:
        void resizeItems() override;
        HBox();
        HBox(Item *parent, const uint32_t &x, const uint32_t &y, const uint32_t &w, const uint32_t &h);
        virtual ~HBox() = default;
        virtual void addWidget(Item *item) override;
    };

    class VBox : public BoxLayout
    {
      public:
        void resizeItems() override;
        VBox();
        VBox(Item *parent, const uint32_t &x, const uint32_t &y, const uint32_t &w, const uint32_t &h);
        virtual ~VBox() = default;
        virtual void addWidget(Item *item) override;
    };

} /* namespace gui */

#endif /* GUI_WIDGETS_BOXLAYOUT_HPP_ */