/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
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 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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#ifndef GCN_DROPDOWN_HPP
#define GCN_DROPDOWN_HPP

#include "guisan/actionlistener.hpp"
#include "guisan/focushandler.hpp"
#include "guisan/focuslistener.hpp"
#include "guisan/keylistener.hpp"
#include "guisan/mouselistener.hpp"
#include "guisan/platform.hpp"
#include "guisan/selectionlistener.hpp"
#include "guisan/widget.hpp"

#include <memory>

namespace gcn
{
    class ListBox;
    class ListModel;
    class ScrollArea;

    /**
     * An implementation of a drop downable list from which an item can be
     * selected. The drop down consists of an internal ScrollArea and an
     * internal ListBox. The drop down also uses an internal FocusHandler to
     * handle the focus of the internal ScollArea and the internal ListBox.
     * The scroll area and the list box can be passed to the drop down
     * if a custom scroll area and/or a custom list box is preferable.
     *
     * To be able display a list the drop down uses a user provided list model.
     * A list model can be any class that implements the ListModel interface.
     *
     * If an item is selected in the drop down a select event will be sent to
     * all selection listeners of the drop down. If an item is selected by
     * using a mouse click or by using the enter or space key an action event
     * will be sent to all action listeners of the drop down.
     */
    class GCN_CORE_DECLSPEC DropDown :
        public Widget,
        public ActionListener,
        public KeyListener,
        public MouseListener,
        public FocusListener,
        public SelectionListener
    {
    public:
        /**
         * Constructor.
         *
         * @param listModel the ListModel to use.
         * @param scrollArea the ScrollArea to use.
         * @param listBox the listBox to use.
         * @see ListModel, ScrollArea, ListBox.
         */
        DropDown(ListModel* listModel,
                 ScrollArea* scrollArea,
                 ListBox* listBox = nullptr);

        /**
         * Constructor.
         *
         * @param listModel the ListModel to use.
         * @param scrollArea the ScrollArea to use.
         * @param listBox the listBox to use.
         * @see ListModel, ScrollArea, ListBox.
         */
        DropDown(ListModel* listModel = nullptr,
                 std::shared_ptr<ScrollArea> scrollArea = nullptr,
                 std::shared_ptr<ListBox> listBox = nullptr);

        /**
         * Destructor.
         */
        ~DropDown() override;

        /**
         * Gets the selected item as an index in the list model.
         *
         * @return the selected item as an index in the list model.
         * @see setSelected
         */
        int getSelected() const;

        /**
         * Sets the selected item. The selected item is represented by
         * an index from the list model.
         *
         * @param selected the selected item as an index from the list model.
         * @see getSelected
         */
        void setSelected(int selected) const;

        /*
         * Clears any selected item
         */
        void clearSelected() const;

        /**
         * Sets the list model to use when displaying the list.
         *
         * @param listModel the list model to use.
         * @see getListModel
         */
        void setListModel(ListModel *listModel);

        /**
         * Gets the list model used.
         *
         * @return the ListModel used.
         * @see setListModel
         */
        ListModel *getListModel();

        /**
         * Adjusts the height of the drop down to fit the height of the
         * drop down's parent's height. It's used to not make the drop down
         * draw itself outside of its parent if folded down.
         */
        void adjustHeight();

        /**
         * Adds a selection listener to the drop down. When the selection
         * changes an event will be sent to all selection listeners of the
         * drop down.
         *
         * @param selectionListener the selection listener to add.
         * @since 0.8.0
         */
        void addSelectionListener(SelectionListener* selectionListener);

        /**
         * Removes a selection listener from the drop down.
         *
         * @param selectionListener the selection listener to remove.
         * @since 0.8.0
         */
        void removeSelectionListener(SelectionListener* selectionListener);

        /*
         * Returns the current Dropdown status
         */
        bool isDroppedDown() const;

        /**
         * Sets the DropDown Widget to dropped-down mode.
         */
        virtual void dropDown();

        /**
        * Sets the DropDown Widget to folded-up mode.
        */
        virtual void foldUp();

        void setBaseColor(const Color& color);

        void setBackgroundColor(const Color& color);

        void setForegroundColor(const Color& color);

        void setFont(Font *font);

        void setSelectionColor(const Color& color);

        // Inherited from Widget

        void draw(Graphics* graphics) override;
        Rectangle getChildrenArea() override;

        // Inherited from FocusListener

        void focusLost(const Event& event) override;

        // Inherited from ActionListener

        void action(const ActionEvent& actionEvent) override;

        // Inherited from DeathListener

        virtual void death(const Event& event);

        // Inherited from KeyListener

        void keyPressed(KeyEvent& keyEvent) override;

        // Inherited from MouseListener

        void mousePressed(MouseEvent& mouseEvent) override;
        void mouseReleased(MouseEvent& mouseEvent) override;
        void mouseWheelMovedUp(MouseEvent& mouseEvent) override;
        void mouseWheelMovedDown(MouseEvent& mouseEvent) override;
        void mouseDragged(MouseEvent& mouseEvent) override;

        // Inherited from SelectionListener

        void valueChanged(const SelectionEvent& event) override;

    protected:
        /**
         * Draws the button with the little down arrow.
         *
         * @param graphics a Graphics object to draw with.
         */
        virtual void drawButton(Graphics *graphics);

        bool mDroppedDown = false;

        /**
         * Distributes a value changed event to all selection listeners
         * of the drop down.
         *
         * @since 0.8.0
         */
        void distributeValueChangedEvent();

        /**
         * True if the drop down has been pushed with the mouse, false
         * otherwise.
         */
        bool mPushed = false;

        /**
         * Holds what the height is if the drop down is folded up.
         * Used when checking if the list of the drop down was clicked
         * or if the upper part of the drop down was clicked on a mouse click.
         */
        int mFoldedUpHeight = 0;

        /**
         * The scroll area used.
         */
        std::shared_ptr<ScrollArea> mScrollArea;
        std::shared_ptr<ListBox> mListBox;

        /**
         * The internal focus handler used to keep track of focus for the
         * internal list box.
         */
        FocusHandler mInternalFocusHandler;

        /**
         * True if an internal scroll area is used, false if a scroll area
         * has been passed to the drop down which the drop down should not
         * deleted in it's destructor.
         */
        bool mInternalScrollArea = false;

        /**
         * True if an internal list box is used, false if a list box
         * has been passed to the drop down which the drop down should not
         * deleted in it's destructor.
         */
        bool mInternalListBox = false;

        /**
         * True if the drop down is dragged.
         */
        bool mIsDragged = false;

        typedef std::list<SelectionListener*> SelectionListenerList;

        /**
         * The selection listener's of the drop down.
         */
        SelectionListenerList mSelectionListeners;

        typedef SelectionListenerList::iterator SelectionListenerIterator;
    };
}

#endif // end GCN_DROPDOWN_HPP
