#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "animation.h"

void init_animation(struct animation* animation,
                    struct animation_init* init) {
  int initial_frame_count = init->initial_frame_count;

  if (initial_frame_count <= 0) {
    fprintf(stderr, "All animations need to have at least 1 frame!\n");
    exit(1);
  }

  animation->num_frames = initial_frame_count;

  int size = initial_frame_count * sizeof(float);

  animation->frame_times = malloc(size);
  memcpy(animation->frame_times, init->initial_frame_times, size);

  size = initial_frame_count * sizeof(SDL_Rect);

  animation->frames = malloc(size);
  memcpy(animation->frames, init->initial_frame_times, size);

}

void update_animation(struct animation* animation, float dt) {
  int frame_index = animation->current_frame;
  float current_frame_time = animation->frame_times[frame_index];

  animation->current_time += dt;

  if(animation->current_time >= current_frame_time) {
    animation->current_time = 0;
    animation->current_frame =
      (frame_index + 1) % animation->num_frames;
  }
}