#include <string>
#include <imgui/imgui_impl_glfw.h>
#include <imgui/imgui_impl_opengl3.h>
#include "user_interface.h"

bool init_user_interface(User_Interface *user_interface, Render_Data *render_data) {
  IMGUI_CHECKVERSION();
  ImGui::CreateContext();
  ImGui_ImplGlfw_InitForOpenGL(render_data->glfw_window, true);
  const char* glsl_version = "#version 460 core";
  ImGui_ImplOpenGL3_Init(glsl_version);
  return true;
}

void create_user_interface_frame(User_Interface *user_interface, Render_Data *render_data) {
  ImGui_ImplOpenGL3_NewFrame();
  ImGui_ImplGlfw_NewFrame();
  ImGui::NewFrame();
  ImGuiWindowFlags imgui_window_flags = 0;
  ImGui::SetNextWindowBgAlpha(0.8f);
  ImGui::Begin("Control", nullptr, imgui_window_flags);
  static f32 new_fps = 0.0f;
  if (render_data->frame_time > 0.0) {
    new_fps = 1.0f / render_data->frame_time;
  }
  user_interface->frames_per_second = (user_interface->averaging_alpha * user_interface->frames_per_second) + (1.0f - user_interface->averaging_alpha) * new_fps;

  ImGui::Text("FPS:");
  ImGui::SameLine();
  ImGui::Text(std::to_string(user_interface->frames_per_second).c_str());
  ImGui::Separator();

  ImGui::Text("UI generation time:");
  ImGui::SameLine();
  ImGui::Text(std::to_string(render_data->user_interface_generate_time).c_str());
  ImGui::SameLine();
  ImGui::Text("ms");
  ImGui::Separator();

  ImGui::Text("Triangles:");
  ImGui::SameLine();
  ImGui::Text(std::to_string(render_data->triangle_count).c_str());
  string window_dims = std::to_string(render_data->width) + "x" +
                       std::to_string(render_data->height);
  ImGui::Text("Window dimensions:");
  ImGui::SameLine();
  ImGui::Text(window_dims.c_str());
  string img_window_position = std::to_string(static_cast<s32>(ImGui::GetWindowPos().x))+ "/" + std::to_string(static_cast<s32>(ImGui::GetWindowPos().y));
  ImGui::Text("ImGui Window Position:");
  ImGui::SameLine();
  ImGui::Text(img_window_position.c_str());
  ImGui::End();
}

void render_user_interface(User_Interface *user_interface) {
  ImGui::Render();
  ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}

void cleanup_user_interface(User_Interface *user_interface) {
  ImGui_ImplOpenGL3_Shutdown();
  ImGui_ImplGlfw_Shutdown();
  ImGui::DestroyContext();
}