#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <limits.h>
#include <time.h>

#include <GLFW/glfw3.h>

#define NK_INCLUDE_FIXED_TYPES
#define NK_INCLUDE_STANDARD_IO
#define NK_INCLUDE_STANDARD_VARARGS
#define NK_INCLUDE_DEFAULT_ALLOCATOR
#define NK_INCLUDE_VERTEX_BUFFER_OUTPUT
#define NK_INCLUDE_FONT_BAKING
#define NK_INCLUDE_DEFAULT_FONT
#define NK_IMPLEMENTATION
#define NK_GLFW_GL2_IMPLEMENTATION
#define NK_KEYSTATE_BASED_INPUT
#include <nuklear.h>
#include "nuklear_glfw_gl2.h"

#define WINDOW_WIDTH 230
#define WINDOW_HEIGHT 250

static void error_callback(int e, const char *d) {
  printf("Error %d: %s\n", e, d);
}

int main(void) {
  /* Platform */
  static GLFWwindow *win;
  int width = 0, height = 0;

  /* GUI */
  struct nk_context *ctx;
  struct nk_colorf bg;

  /* GLFW */
  glfwSetErrorCallback(error_callback);
  if (!glfwInit()) {
    fprintf(stdout, "[GFLW] failed to init!\n");
    exit(1);
  }
  win = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Demo", NULL, NULL);
  glfwMakeContextCurrent(win);
  glfwGetWindowSize(win, &width, &height);

  /* GUI */
  ctx = nk_glfw3_init(win, NK_GLFW3_INSTALL_CALLBACKS);
  /* Load Fonts: if none of these are loaded a default font will be used  */
  /* Load Cursor: if you uncomment cursor loading please hide the cursor */
  {
    struct nk_font_atlas *atlas;
    nk_glfw3_font_stash_begin(&atlas);
    /*struct nk_font *droid = nk_font_atlas_add_from_file(atlas,
     * "../../../extra_font/DroidSans.ttf", 14, 0);*/
    /*struct nk_font *roboto = nk_font_atlas_add_from_file(atlas,
     * "../../../extra_font/Roboto-Regular.ttf", 14, 0);*/
    /*struct nk_font *future = nk_font_atlas_add_from_file(atlas,
     * "../../../extra_font/kenvector_future_thin.ttf", 13, 0);*/
    /*struct nk_font *clean = nk_font_atlas_add_from_file(atlas,
     * "../../../extra_font/ProggyClean.ttf", 12, 0);*/
    /*struct nk_font *tiny = nk_font_atlas_add_from_file(atlas,
     * "../../../extra_font/ProggyTiny.ttf", 10, 0);*/
    nk_rune ranges_latin[] = {
    0x0020, 0x007E,     /* Ascii */
    0x00A1, 0x00FF,     /* Symbols + Umlaute */
    0x0410, 0x044F,     /* Main Cyrillic */
    0
};
    struct nk_font_config cfg_japan = nk_font_config(0);
    cfg_japan.range = ranges_latin;
    struct nk_font *compassgold_font = nk_font_atlas_add_from_file(atlas, "Ubuntu-R.ttf", 18, 0, &cfg_japanm  );
    nk_style_set_font(ctx, &compassgold_font->handle);
    nk_glfw3_font_stash_end();
  }

    bg.r = 0.10f, bg.g = 0.18f, bg.b = 0.24f, bg.a = 1.0f;



    while (!glfwWindowShouldClose(win)) {
      /* Input */
      glfwPollEvents();
      nk_glfw3_new_frame();

      /* GUI */
      if (nk_begin(ctx, "Demo", nk_rect(0, 0, 230, 250), NK_WINDOW_BORDER)) {
        enum { EASY, HARD };
        static int op = EASY;
        static char text[1][64];
        static int text_len[3];

        nk_layout_row_static(ctx, 30, 80, 1);
        nk_label(ctx, "Введите URL", NK_TEXT_CENTERED);
        nk_edit_string(ctx, NK_EDIT_FIELD, text[0], &text_len[2], 64, nk_filter_default);

        if (nk_button_label(ctx, "button"))
          fprintf(stdout, "button pressed\n");


        nk_layout_row_dynamic(ctx, 30, 2);
        if (nk_option_label(ctx, "easy", op == EASY))
          op = EASY;
        if (nk_option_label(ctx, "hard", op == HARD))
          op = HARD;
      }
      nk_end(ctx);

      /* Draw */
      glfwGetWindowSize(win, &width, &height);
      glViewport(0, 0, width, height);
      glClear(GL_COLOR_BUFFER_BIT);
      glClearColor(bg.r, bg.g, bg.b, bg.a);
      /* IMPORTANT: `nk_glfw_render` modifies some global OpenGL state
       * with blending, scissor, face culling and depth test and defaults
       * everything back into a default state. Make sure to either save and
       * restore or reset your own state after drawing rendering the UI. */
      nk_glfw3_render(NK_ANTI_ALIASING_ON);
      glfwSwapBuffers(win);
    }

    nk_glfw3_shutdown();
    glfwTerminate();
    return 0;
}