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

#include "UICanvas.hpp"
#include "scene/Scene.hpp"
#include "ui/UIComponent.hpp"
#include "game/DawnGame.hpp"

using namespace Dawn;

UICanvas * UICanvas::create(Scene *scene) {
  auto item = scene->createSceneItem();
  return item->addComponent<UICanvas>();
}

UICanvas::UICanvas(SceneItem *item) : SceneItemComponent(item) {
}

float_t UICanvas::getWidth() {
  return this->getGame()->renderManager.getBackBuffer()->getWidth();
}

float_t UICanvas::getHeight() {
  return this->getGame()->renderManager.getBackBuffer()->getHeight();
}

void UICanvas::onStart() {
  this->getGame()->renderManager.getBackBuffer()->eventRenderTargetResized
    .addListener(this, &UICanvas::onBackBufferResize)
  ;
}

void UICanvas::onBackBufferResize(
  RenderTarget *target,
  float_t width,
  float_t height
) {
  auto it = this->children.begin();
  while(it != this->children.end()) {
    (*it)->updatePositions();
    ++it;
  }
}

UICanvas::~UICanvas() {
  auto it = this->children.begin();
  while(it != this->children.end()) {
    delete *it;
    ++it;
  }

  this->getGame()->renderManager.getBackBuffer()->eventRenderTargetResized
    .removeListener(this, &UICanvas::onBackBufferResize)
  ;
}