#include "classicnoteflyingstate.h"
#include "../classicnote.h"
#include "../classicsprite.h"

auto ClassicNoteFlyingState::value() const -> Value
{
    return Value::FLYING;
}

auto ClassicNoteFlyingState::update(const ClassicNote* note, const microsec& offset) -> Value
{
    float i;
    auto update_time = offset - note->getApearanceTime();   // This all will be inside ::update
    i = update_time / note->getOneTrailPercent() * 0.01;      //         of an animation object

    const auto& coordinates = note->getCoordinates();
    const auto& sprite = note->sprite();
    float xa = getPt( coordinates.x + 20.  , coordinates.x + 90. , i );
    float ya = getPt( coordinates.y - 600. , coordinates.y - 150. , i );
    float xb = getPt( coordinates.x + 90.  , coordinates.x , i );
    float yb = getPt( coordinates.y - 150. , coordinates.y , i );

    sprite->update(getPt( xa , xb , i ), getPt( ya , yb , i ));
    if (i >= 1)
    {
        sprite->trailFade();
    }

    if (note->isActive(offset))
        return Value::ACTIVE;

    return value();
}

constexpr int ClassicNoteFlyingState::getPt(float n1, float n2, float perc) const
{
    float diff = n2 - n1;
    return n1 + (diff * perc);
}

void ClassicNoteFlyingState::onEntering(const ClassicNote* note)
{
    const auto& coordinates = note->getCoordinates();
    const auto& sprite = note->sprite();

    sprite->setCoordinates(coordinates.x,      coordinates.y,
                           coordinates.x + 20, coordinates.y - 600);
}