#pragma once
#include <array>
#include "hardware/adc.h"
#include <cstdint>

namespace
{
std::array<std::uint32_t, 2> previous_samples { 0xffff'ffffu, 0xffff'ffffu };

}

namespace adc
{

struct Sample
{
    std::uint8_t value {0};
    bool changed {false};
};

void
init()
{
    adc_init();
    adc_gpio_init(26);
    adc_gpio_init(27);
}

std::array<Sample, 2>
get_samples()
{
    std::array<Sample, 2> samples {};
    for (std::size_t i = 0; i < samples.size(); i++)
    {
        adc_select_input(i);

        std::uint16_t const measurement = adc_read();
        samples[i].changed = measurement != previous_samples[i];
        previous_samples[i] = measurement;
        samples[i].value = static_cast<uint8_t>(measurement * 127u / 4095u); // TODO add hysteresis
    }

    return samples;
}

}