#include <GL/glut.h>
#include <string>

#include "textures.h"

int render_7_seg_img;

void render_7_seg_part(int id, double size)
{
  // Start drawing
  glBegin(GL_QUADS);

  glTexCoord2d((id+0)/11.0, 0); glVertex2d(0   ,0   );
  glTexCoord2d((id+1)/11.0, 0); glVertex2d(size,0   );
  glTexCoord2d((id+1)/11.0, 1); glVertex2d(size,size);
  glTexCoord2d((id+0)/11.0, 1); glVertex2d(0   ,size);

  // Stop drawing
  glEnd();
}

void render_7_seg(unsigned long n, double size, int places)
{
  // Bind the texture
  glBindTexture(GL_TEXTURE_2D, render_7_seg_img);

  // Convert the number to a string
  std::string str = std::to_string(n);

  // Is the place count negative, by default
  if(places == -1)
  {
    // Set the places to display as the string size
    places = str.size();
  }

  // Loop over the places
  for(int i=0;i<places;i++)
  {
    // Is the iterator too large
    if(i >= str.size())
    {
      // Render a blank pane
      render_7_seg_part(10, size);
    }

    else
    {
      // Get part of the number to view
      char item = str[str.size()-i];

      // Render the item
      if(item=='0') render_7_seg_part(0, size);
      if(item=='1') render_7_seg_part(1, size);
      if(item=='2') render_7_seg_part(2, size);
      if(item=='3') render_7_seg_part(3, size);
      if(item=='4') render_7_seg_part(4, size);
      if(item=='5') render_7_seg_part(5, size);
      if(item=='6') render_7_seg_part(6, size);
      if(item=='7') render_7_seg_part(7, size);
      if(item=='8') render_7_seg_part(8, size);
      if(item=='9') render_7_seg_part(9, size);
    }
  }

  // Unbind the image
  glBindTexture(GL_TEXTURE_2D, 0);
}

void text_init()
{
  // Load the 7 segment display
  int w, h;
  render_7_seg_img = loadArchiveImageGL("textures/7-seg.rimg", 'L', w, h);
}