#include "scenes/frame_animator.hpp"

#include <algorithm>

namespace scenes {

FrameAnimator::FrameAnimator(int num_frames, int frame_ms, bool loop)
    : num_frames_(std::max(1, num_frames)),
      frame_ms_(std::max(1, frame_ms)),
      loop_(loop) {}

void FrameAnimator::tick(int delta_ms) {
    if (finished_) return;
    elapsed_ms_ += delta_ms;
    while (elapsed_ms_ >= frame_ms_) {
        elapsed_ms_ -= frame_ms_;
        ++current_frame_;
        if (current_frame_ >= num_frames_) {
            if (loop_) {
                current_frame_ = 0;
            } else {
                current_frame_ = num_frames_ - 1;
                finished_ = true;
                return;
            }
        }
    }
}

void FrameAnimator::reset() {
    current_frame_ = 0;
    elapsed_ms_ = 0;
    finished_ = false;
}

}  // namespace scenes