advent_of_code_2019/day_12/Moon.php

<?php

class Moon
{
    /** @var int */
    protected $x;
    /** @var int */
    protected $y;
    /** @var int */
    protected $z;

    /** @var string[] */
    protected $history = [];

    /**
     * @var Velocity
     */
    protected $velocity;

    /**
     * Moon constructor.
     * @param int $x
     * @param int $y
     * @param int $z
     */
    public function __construct(int $x, int $y, int $z)
    {
        $this->x = $x;
        $this->y = $y;
        $this->z = $z;
        $this->addHistory(sprintf('%s,%s,%s,0,0,0', $this->getX(), $this->getY(), $this->getZ()));
        $this->velocity = new Velocity(0,0,0);
    }

    /**
     * @return int
     */
    public function getX(): int
    {
        return $this->x;
    }

    /**
     * @param int $x
     * @return Moon
     */
    public function setX(int $x): Moon
    {
        $this->x = $x;
        return $this;
    }

    /**
     * @return int
     */
    public function getY(): int
    {
        return $this->y;
    }

    /**
     * @param int $y
     * @return Moon
     */
    public function setY(int $y): Moon
    {
        $this->y = $y;
        return $this;
    }

    /**
     * @return int
     */
    public function getZ(): int
    {
        return $this->z;
    }

    /**
     * @param int $z
     * @return Moon
     */
    public function setZ(int $z): Moon
    {
        $this->z = $z;
        return $this;
    }

    /**
     * @return Velocity
     */
    public function getVelocity(): Velocity
    {
        return $this->velocity;
    }

    /**
     * @param Velocity $velocity
     * @return Moon
     */
    public function setVelocity(Velocity $velocity): Moon
    {
        $this->velocity = $velocity;
        return $this;
    }

    /**
     * @return string[]
     */
    public function getHistory(): array
    {
        return $this->history;
    }

    /**
     * @param string $history
     * @return Moon
     */
    public function addHistory($history): Moon
    {
        $this->history[] = $history;
        return $this;
    }

    public function saveHistory()
    {
        $velocity = $this->getVelocity();
        $this->history[] = sprintf(
            '%s,%s,%s,%s,%s,%s',
            $this->getX(),
            $this->getY(),
            $this->getZ(),
            $velocity->getX(),
            $velocity->getY(),
            $velocity->getZ()
        );
        return $this;
    }
}