// Copyright (c) 2022 Dominic Masters
// 
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

#pragma once
#include "UIComponent.hpp"
#include "display/mesh/QuadMesh.hpp"
#include "display/font/Font.hpp"

namespace Dawn {
  class UILabel : public UIComponent {
    private:
      Mesh mesh;
      bool_t needsRebuffering = true;
      Font *font = nullptr;
      std::string key = "";
      float_t fontSize = 10.0f;
      bool_t hasText = false;

      void updatePositions() override;

      /** Event for when the language strings are updated */
      void onLanguageUpdated();

    public:
      struct FontMeasure measure;
      int32_t startQuad = 0;
      int32_t quadCount = -1;

      /** The colour of this label */
      struct Color textColor = COLOR_MAGENTA;

      UILabel(UICanvas *canvas);
      void drawSelf(UIShader *shader, glm::mat4 selfTransform) override;
      virtual float_t getContentWidth() override;
      virtual float_t getContentHeight() override;
      void setTransform(
        UIComponentAlign xAlign,
        UIComponentAlign yAlign,
        glm::vec4 alignment,
        float_t z
      ) override;

      /**
       * Internal method to force the font mesh to be recreated.
       */
      void updateMesh();

      /**
       * Set the font to use for the label.
       * 
       * @param font Font to use.
       */
      void setFont(Font *font);
      
      /**
       * Sets the text for the label to use.
       * 
       * @param key Localzied string key for the label to use.
       */
      void setText(std::string key);

      /**
       * Sets / Updates the font size for the label.
       * 
       * @param fontSize Font size to use.
       */
      void setFontSize(float_t fontSize);

      ~UILabel();
  };
}