#include "render.hpp"
#include "config.hpp"
#include <algorithm>

Engine::Engine(Deck &deck) :
  deck(deck)
{
  text.load_font();
  screen.init();
  framebuffer.init();
}

void Engine::render() {
  framebuffer.begin();

  glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
  glClear(GL_COLOR_BUFFER_BIT);

  auto& slide = deck.slides.at(at_slide);
  float line = 0;

  for(auto& node : slide.content) {
    if(node.type == NodeType::TEXT || node.type == NodeType::H1 || node.type == NodeType::UL) {
      line++;
      float y = (text.font_size + 20) * line;
      text.render(node.content, 25.0f, SCR_HEIGHT - y, 1.0f,
          glm::vec3(1.0f, 1.0f, 1.0f));
    }
  }

  framebuffer.commit();
  framebuffer.draw(screen);
}

void Engine::change_slide(int dir) {
  if(deck.slides.size() == 0) at_slide = 0;

  at_slide = std::clamp(at_slide + dir, 0, int(deck.slides.size() - 1));
}