#include "app.hpp"

#include "saura/core/app_base/app_base.hpp"

namespace saura {
App::App() {
  is_running = true;

  os_ctx = std::make_unique<OS>();
  os_ctx->set_root_window_title(get_app_base()->get_title());

  server_api_ctx = std::make_shared<ServerAPI>();
}

App::~App() {}

void App::run() {
  const double fps_max = 60.0;
  const double period_max = 1.0 / fps_max;
  const double perf_frequency = os_ctx->get_performance_frequency();

  double time = 0.0;
  double begin_counter = 0.0;
  double end_counter = 0.0;

  get_app_base()->start();

  while (is_running) {
    double counter_elapsed = begin_counter - end_counter;
    double dt = counter_elapsed / perf_frequency;
    double fps = perf_frequency / counter_elapsed;

    begin_counter = os_ctx->get_performance_counter();

    if (dt >= period_max) {
      if (dt >= 1.0) {
        dt = period_max;
      }

      if (!os_ctx->update_events()) {
        is_running = false;
      }
      os_ctx->update();
      os_ctx->draw_begin();
      get_app_base()->update(dt);
      os_ctx->draw_end();

      end_counter = begin_counter;
    }

    os_ctx->sleep(period_max);
  }

  get_app_base()->stop();
}
} // namespace saura