#include <stdio.h>
#include "raytracing_stats.h"

int RayTracingStats::width;
int RayTracingStats::height;
int RayTracingStats::num_x;
int RayTracingStats::num_y;
int RayTracingStats::num_z;
Vec3f RayTracingStats::min_bounds;
Vec3f RayTracingStats::max_bounds;

unsigned long long RayTracingStats::start_time;
unsigned long long RayTracingStats::num_nonshadow_rays;
unsigned long long RayTracingStats::num_shadow_rays;
unsigned long long RayTracingStats::num_intersections;
unsigned long long RayTracingStats::num_grid_cells_traversed;

// ====================================================================
// ====================================================================

void RayTracingStats::PrintStatistics()  {
  
  int delta_time = time(NULL) - start_time;
  if (delta_time == 0) delta_time = 1;
  int secs  = delta_time % 60;
  int min   = (delta_time / 60) % 60; 
  int hours = delta_time / (60*60);
  int num_rays = num_nonshadow_rays + num_shadow_rays;
  float rays_per_sec =  float(num_rays) / float(delta_time);
  float rays_per_pixel =  float(num_rays) / float(width*height);
  float intersections_per_ray = num_intersections / float(num_rays);
  float traversed_per_ray = num_grid_cells_traversed / float(num_rays);

  printf ("********************************************\n");
  printf ("RAY TRACING STATISTICS\n");
  printf ("  total time                 %ld:%02d:%02d\n",hours,min,secs);
  printf ("  num pixels                 %d (%dx%d)\n", width*height,width,height);
  printf ("  scene bounds               (%0.2f %0.2f %0.2f) -> (%0.2f %0.2f %0.2f)\n",
	  min_bounds.x(),min_bounds.y(),min_bounds.z(),  max_bounds.x(),max_bounds.y(),max_bounds.z());
  printf ("  num grid cells             %d (%dx%dx%d)\n", num_x*num_y*num_z,num_x,num_y,num_z);
  printf ("  num non-shadow rays        %lld\n", num_nonshadow_rays);
  printf ("  num shadow rays            %lld\n", num_shadow_rays);
  printf ("  total intersections        %lld\n", num_intersections);
  printf ("  total cells traversed      %lld\n", num_grid_cells_traversed);
  printf ("  rays per second            %0.1f\n",rays_per_sec);
  printf ("  rays per pixel             %0.1f\n",rays_per_pixel);
  printf ("  intersections per ray      %0.1f\n",intersections_per_ray);
  printf ("  cells traversed per ray    %0.1f\n",traversed_per_ray);
  printf ("********************************************\n");
  
}

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// ====================================================================