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

#include "TiledSprite.hpp"
#include "scene/SceneItem.hpp"

using namespace Dawn;

TiledSprite::TiledSprite(std::weak_ptr<SceneItem> item) :
  SceneItemComponent(item),
  tile(-1),
  tileset(nullptr),
  meshHost(nullptr),
  flip(TILED_SPRITE_FLIP_Y),
  sizeType(TILED_SPRITE_SIZE_TYPE_SCALE),
  size(1.0f)
{

}

std::vector<std::shared_ptr<SceneItemComponent>> TiledSprite::getDependencies() {
  if(this->meshHost == nullptr) {
    this->meshHost = item.lock()->getComponent<QuadMeshHost>();
  }

  return { this->meshHost._realValue };
}

void TiledSprite::onStart() {
  SceneItemComponent::onStart();

  useEffect([&]{
    if(this->meshHost == nullptr || this->tileset == nullptr) return;
    auto tile = this->tileset->getTile(this->tile);
    this->meshHost->uv0 = glm::vec2(
      (((flag_t)this->flip) & TILED_SPRITE_FLIP_X) == 0 ? tile.uv0.x : tile.uv1.x,
      (((flag_t)this->flip) & TILED_SPRITE_FLIP_Y) == 0 ? tile.uv0.y : tile.uv1.y
    );
    this->meshHost->uv1 = glm::vec2(
      (((flag_t)this->flip) & TILED_SPRITE_FLIP_X) == 0 ? tile.uv1.x : tile.uv0.x,
      (((flag_t)this->flip) & TILED_SPRITE_FLIP_Y) == 0 ? tile.uv1.y : tile.uv0.y
    );
  }, {
    &this->tile,
    &this->meshHost,
    &this->tileset,
    &this->flip
  })();

  useEffect([&]{
    if(this->meshHost == nullptr || this->tileset == nullptr) return;
    auto tile = this->tileset->getTile(this->tile);

    glm::vec2 quadSize;

    switch(this->sizeType) {
      case TILED_SPRITE_SIZE_TYPE_SCALE: {
        quadSize = glm::vec2(
          this->tileset->getTileWidth(this->tile),
          this->tileset->getTileHeight(this->tile)
        ) * (float_t)this->size;
        break;
      }

      case TILED_SPRITE_SIZE_TYPE_WIDTH_RATIO: {
        float_t rw = this->tileset->getTileHeight(this->tile) / this->tileset->getTileWidth(this->tile);
        quadSize.x = (float_t)this->size;
        quadSize.y = quadSize.x * rw;
        break;
      }

      case TILED_SPRITE_SIZE_TYPE_HEIGHT_RATIO: {
        float_t rh = this->tileset->getTileWidth(this->tile) / this->tileset->getTileHeight(this->tile);
        quadSize.y = (float_t)this->size;
        quadSize.x = quadSize.y * rh;
        break;
      }

      default:
        assertUnreachable("TiledSprite::onStart: Size type not implemented");
    }

    this->meshHost->xy0 = -quadSize;
    this->meshHost->xy1 = quadSize;
  }, {
    &this->tile,
    &this->meshHost,
    &this->tileset,
    &this->size
  })();
}