#include <GLFW/glfw3.h>

#include "glfw/glfw_monitor.h"
#include "precomp.h"

namespace veng {
gsl::span<GLFWmonitor *> GetMonitors() {
  std::int32_t monitor_count = 0;
  GLFWmonitor **monitor_pointers = glfwGetMonitors(&monitor_count);
  return gsl::span<GLFWmonitor *>(monitor_pointers, monitor_count);
}

glm::ivec2 GetMonitorPosition(gsl::not_null<GLFWmonitor *> monitor) {
  glm::ivec2 monitor_position;
  glfwGetMonitorPos(monitor, &monitor_position.x, &monitor_position.y);
  return monitor_position;
}
glm::ivec2 GetMonitorWorkAreaSize(gsl::not_null<GLFWmonitor *> monitor) {
  glm::ivec2 monitor_size;
  glfwGetMonitorWorkarea(monitor, nullptr, nullptr, &monitor_size.x,
                         &monitor_size.y);
  return monitor_size;
}

void MoveWindowToMonitor(gsl::not_null<GLFWwindow *> window,
                         gsl::not_null<GLFWmonitor *> monitor) {
  glm::ivec2 window_size;
  glfwGetWindowSize(window, &window_size.x, &window_size.y);
  const glm::ivec2 window_new_position = GetMonitorPosition(monitor) +
                                         (GetMonitorWorkAreaSize(monitor) / 2) -
                                         (window_size / 2);
  glfwSetWindowPos(window, window_new_position.x, window_new_position.y);
}
}  // namespace veng