/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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_CONTAINER_HPP
#define GCN_CONTAINER_HPP

#include <list>

#include "guisan/containerlistener.hpp"
#include "guisan/graphics.hpp"
#include "guisan/platform.hpp"
#include "guisan/widget.hpp"

namespace gcn
{
    /**
     * An implementation of a container able to contain other widgets. A widget's 
     * position in the container is relative to the container itself and not the screen. 
     * A container is the most common widget to use as the Gui's top widget as makes the Gui
     * able to contain more than one widget.
     *
     * @see Gui::setTop
     */
    class GCN_CORE_DECLSPEC Container: public Widget
    {
    public:

        /**
         * Constructor. A container is opaque as default, if you want a
         * non-opaque container call setOpaque(false).
         *
         * @see setOpaque, isOpaque
         */
        Container() = default;

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

        /**
         * Sets the container to be opaque or not. If the container
         * is opaque its background will be drawn, if it's not opaque
         * its background will not be drawn, and thus making the container
         * completely transparent.
         *
         * NOTE: This is not the same as to set visibility. A non visible
         *       container will not itself nor will it draw its content.
         *
         * @param opaque True if the container should be opaque, false otherwise.
         * @see isOpaque
         */
        virtual void setOpaque(bool opaque);

        /**
         * Checks if the container is opaque or not.
         *
         * @return True if the container is opaque, false otherwise.
         * @see setOpaque
         */
        [[nodiscard]] bool isOpaque() const;

        /**
         * Adds a widget to the container.
         *
         * @param widget The widget to add.
         * @see remove, clear
         */
        void add(Widget* widget) override;

        /**
         * Adds a widget to the container and also specifies the widget's
         * position in the container. The position is relative to the container
         * and not relative to the screen.
         *
         * @param widget The widget to add.
         * @param x The x coordinat for the widget.
         * @param y The y coordinat for the widget.
         * @see remove, clear
         */
        virtual void add(Widget* widget, int x, int y);

        /**
         * Removes a widget from the Container.
         *
         * @param widget The widget to remove.
         * @throws Exception when the widget has not been added to the
         *                   container.
         * @see add, clear
         */
        void remove(Widget* widget) override;

        /**
         * Clears the container of all widgets.
         *
         * @see add, remove
         */
        void clear() override;

        /**
         * Finds a widget given an id.
         *
         * @param id The id to find a widget by.
         * @return A widget with a corrosponding id, nullptr if no widget 
         *         is found.
         * @see Widget::setId
         */
        Widget* findWidgetById(const std::string &id) override;

        /**
         * Adds a container listener to the container. When a widget is
         * added or removed an event will be sent to all container 
         * listeners of the container
         *
         * @param containerListener The container listener to add.
         * @since 1.1.0
         */
        void addContainerListener(ContainerListener* containerListener);

        /**
         * Removes a container listener from the container.
         *
         * @param containerListener The container listener to remove.
         * @since 1.1.0
         */
        void removeContainerListener(ContainerListener* containerListener);

        /**
         * Returns the children of the container.
         *
         * @return The children of the container.
         */
        [[nodiscard]] const std::list<Widget*>& getChildren() const override;

        /**
         * Resizes the Container's size to fit te content exactly.
         */
        virtual void resizeToContent();

        // Inherited from Widget

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

    protected:
        /**
         * Distributes a widget added container event to all container listeners
         * of the container.
         * 
         * @param source The source widget of the event.
         * @since 1.1.0
         */
        void distributeWidgetAddedEvent(Widget* source);

        /**
         * Distributes a widget removed container event to all container listeners
         * of the container.
         * 
         * @param source The source widget of the event.
         * @since 1.1.0
         */
        void distributeWidgetRemovedEvent(Widget* source);

        /**
         * True if the container is opaque, false otherwise.
         */
        bool mOpaque = true;

        typedef std::list<ContainerListener*> ContainerListenerList;

        /**
         * The container listeners of the container.
         */
        ContainerListenerList mContainerListeners;

        typedef ContainerListenerList::iterator ContainerListenerIterator;
    };
}

#endif // end GCN_CONTAINER_HPP
