/*
Crafter®.Graphics
Copyright (C) 2025 Catcrafts®
Catcrafts.net

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3.0 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
*/

export module Crafter.Graphics:UiElement;
import std;
import Crafter.Event;
import :Types;

namespace Crafter {
    /**
    * @brief General use UiElement for handeling input events.
    * Add to a window's elements member to start recieving events.
    */
    export class UiElement {
    public:
        Event<MouseMoveEvent> onMouseMove;
        Event<MouseMoveEvent> onMouseEnter;
        Event<MouseMoveEvent> onMouseLeave;
        Event<MousePoint> onMouseRightClick;
        Event<MousePoint> onMouseLeftClick;
        Event<MousePoint> onMouseRightHold;
        Event<MousePoint> onMouseLeftHold;
        Event<MousePoint> onMouseRightRelease;
        Event<MousePoint> onMouseLeftRelease;
        float z;
        float anchorX;
        float anchorY;
        bool useRelativeSize;
        bool ignoreScaling;
        std::uint32_t bufferWidth;
        std::uint32_t bufferHeight;
        std::uint32_t absoluteWidth;
        std::uint32_t absoluteHeight;
        float relativeWidth;
        float relativeHeight;
        float anchorOffsetX;
        float anchorOffsetY;
        std::vector<Pixel_BU8_GU8_RU8_AU8> buffer;
        std::vector<UiElement> children;

        /**
        * @brief Constructs a UiElement with absolute dimensions
        * @param anchorX Relative position where this elements x anchor (top-left) is placed to its parent x anchor 
        * @param anchorY Relative position where this elements y anchor (top-left) is placed to its parent y anchor 
        * @param bufferWidth The width of this elements pixel buffer
        * @param bufferHeight The height of this elements pixel buffer
        * @param absoluteWidth The absolute x size in pixels this element should be scaled to
        * @param absoluteHeight The absolute y size in pixels this element should be scaled to
        * @param anchorOffsetX The amount this element's anchor should be offset from the top left corner (0.5 to in the middle)
        * @param anchorOffsetY The amount this element's anchor should be offset from the top left corner (0.5 to place it in the middle)
        * @param z This elements Z position
        * @param ignoreScaling Wether this element ignores the scaling of the window, if true its size will be scaled according to the window scale
        */
        UiElement(float anchorX, float anchorY, std::uint32_t bufferWidth, std::uint32_t bufferHeight, std::uint32_t absoluteWidth, std::uint32_t absoluteHeight, float anchorOffsetX = 0.5,  float anchorOffsetY = 0.5,  float z = 0, bool ignoreScaling = false);
        
        /**
        * @brief Constructs a UiElement with relative dimensions
        * @param anchorX Relative position where this elements x anchor (top-left) is placed to its parent x anchor 
        * @param anchorY Relative position where this elements y anchor (top-left) is placed to its parent y anchor 
        * @param bufferWidth The width of this elements pixel buffer
        * @param bufferHeight The height of this elements pixel buffer
        * @param relativeWidth The relative x size this element should be scaled to compared to its parent
        * @param relativeHeight The relative y size this element should be scaled to compared to its parent
        * @param anchorOffsetX The amount this element's anchor should be offset from the top left corner (0.5 to in the middle)
        * @param anchorOffsetY The amount this element's anchor should be offset from the top left corner (0.5 to place it in the middle)
        * @param z This elements Z position
        * @param ignoreScaling Wether this element ignores the scaling of the window, if true its size will be scaled according to the window scale
        */
        UiElement(float anchorX, float anchorY, std::uint32_t bufferWidth, std::uint32_t bufferHeight, float relativeWidth, float relativeHeight, float anchorOffsetX = 0.5,  float anchorOffsetY = 0.5,  float z = 0, bool ignoreScaling = false);
    };
}