#include "include/time.h"

#define MAX_SKIPPED_FRAMES 20
#define DEFAULT_GAME_SPEED 10

Uint16 cycles_to_calculate = 0;
int game_speed;
Uint16 cycle_length;
static Uint32 timer1, timer2;

void time_init() {
  time_set_game_speed(DEFAULT_GAME_SPEED);
}

void time_set_game_speed(int speed) {
  if (speed <= 0) speed = 1;
  game_speed = speed;
  cycle_length = 1000 / game_speed;
  timer1 = SDL_GetTicks();
}

void time_update() {

  while (1) {
    timer2 = SDL_GetTicks() - timer1;
    
    if (timer2 >= cycle_length) break;
    else SDL_Delay(3);
  }
  
  timer1 = SDL_GetTicks() - (timer2 % cycle_length);
  cycles_to_calculate = timer2 / cycle_length;
  if (cycles_to_calculate > MAX_SKIPPED_FRAMES) cycles_to_calculate = MAX_SKIPPED_FRAMES;
}