// Copyright (c) 2023 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#pragma once
#include "display/shader/UIShader.hpp"
#include "component/ui/UICanvas.hpp"

namespace Dawn {
  class UIElement {
    protected:
      /**
       * Virtual method overridden by the UIElement to get the quads for the
       * component.
       * 
       * @param alignment The alignment of this component.
       * @param ctx The canvas to add the quads to.
       */
      virtual void getSelfQuads(UICanvas &ctx);

    public:
      /**
       * Overrided method by the UI Element that requests the minimum 
       * width of the content.
       * 
       * @return The minimum width of the content.
       */
      virtual float_t getContentWidth();

      /**
       * Overrided method by the UI Element that requests the minimum 
       * height of the content.
       * 
       * @return The minimum height of the content.
       */
      virtual float_t getContentHeight();

      /**
       * Returns the width of this component.
       * 
       * @return The width of this component.
       */
      virtual float_t getWidth();

      /**
       * Returns the height of this component.
       * 
       * @return The height of this component.
       */
      virtual float_t getHeight();

      /**
       * Virtual method overridden by the UIElement to get the children of
       * this component.
       */
      virtual std::vector<std::shared_ptr<UIElement>> getChildren();

      /**
       * Method called by the UICanvas to get the quads for this component.
       * 
       * @param ctx The canvas to add the quads to.
       */
      void getQuads(UICanvas &ctx);

      /**
       * Updates the alignment of this component based on the parent. Typically
       * left to the UIAlignableElement to implement, default implementation
       * does nothing but invoke children.
       * 
       * @param parentPosition The position of the parent.
       * @param parentSize The size of the parent.
       */
      virtual void updateAlignment(
        const glm::vec2 parentPosition,
        const glm::vec2 parentSize,
        const float_t canvasScale
      );
  };
}