#include "stopwatch.hpp"
#include <spdlog/spdlog.h>

namespace basalt::presenter::stopwatch {

    Stopwatch::Stopwatch(size_t interval) : start_point(std::chrono::steady_clock::now()), interval(interval), counter(0) {}

    Stopwatch::~Stopwatch() {}

    void Stopwatch::tick() {
        // 自增计时器
        ++this->counter;
        if (this->counter >= this->interval) {
            // 计数器归零
            this->counter = 0;

            // 记下当前时刻，计算帧时间和FPS
            auto stop_point = std::chrono::steady_clock::now();
            auto time_diff = std::chrono::duration_cast<std::chrono::milliseconds>(stop_point - this->start_point);
            auto frame_time = static_cast<double>(time_diff.count()) / this->interval;
            auto fps = 1000.0 / frame_time;
            // 输出给用户
            spdlog::info("FPS: {:.2f} Frame Time: {:.4f} ms", fps, frame_time);

            // 把结束时间设置为开始时间继续下一轮循环
            this->start_point = stop_point;
        }
    }

} // namespace basalt::presenter::stopwatch