#include "Heart.h"
#include <gpiod.hpp>

namespace cardio
{
    Heart::Heart(const char* chipName, const unsigned int lineOffset)
        : _lastBeat(std::chrono::steady_clock::now()),
          chip_(std::string("/dev/") + chipName),
          isOn_(false),
          request_(get_line_request(chip_, lineOffset))
    {
    }

    void Heart::beat()
    {
        const auto now = std::chrono::steady_clock::now();
        if (const auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>
            (now - _lastBeat); elapsed.count() >= 500)
        {
            isOn_ = !isOn_;
            const auto val = isOn_ ? gpiod::line::value::ACTIVE : gpiod::line::value::INACTIVE;
            request_.set_value(DEFAULT_HEART_PIN, val);
            _lastBeat = now;
        }
    }

    void Heart::stop()
    {
        isOn_ = false;
        request_.set_value(DEFAULT_HEART_PIN, gpiod::line::value::INACTIVE);
    }

    gpiod::line_request Heart::get_line_request(gpiod::chip& chip, const unsigned int lineOffset)
    {
        const auto settings = gpiod::line_settings()
            .set_direction(gpiod::line::direction::OUTPUT);

        return chip.prepare_request()
            .add_line_settings(lineOffset, settings)
            .do_request();
    }
}