#include "Time.hpp"
#include "Common/Casts.hpp"
#include <chrono>
#include <algorithm>

namespace MC {

void Time::start_frame() {
    m_current_frame_start = now();
}

void Time::end_frame() {
    auto frame_end = now();
    m_delta = TO(Real, frame_end - m_current_frame_start) / 1000.0;
    m_delta = std::clamp(m_delta, delta_min, delta_max);

    m_total_frames++;
}

U64 Time::total_frames() const {
    return m_total_frames;
}

Time::Tick Time::tick() const {
    return total_frames();
}

Real Time::delta() const {
    return m_delta;
}

Time::Timestamp Time::frame_start() const {
    return m_current_frame_start;
}

Time::Timestamp Time::now() {
    auto time = std::chrono::system_clock::now().time_since_epoch();
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(time);
    return ms.count();
}

}