class GroupItem extends SkuItem implements JsonSerializable
{
    /**
     * Group item ID
     *
     * @var int
     */
    private $id;

    /**
     * Group ID
     *
     * @var int
     */
    private $groupId;

    /**
     * Group item label
     *
     * @var string
     */
    private $itemLabel;

    /**
     * Quantity of the group item
     *
     * @var int
     */
    private $itemQuantity;

    /**
     * The amount added (or subtracted if the value is negative) to the combo item's
     * base SKU price
     *
     * Used to adjust the total price appropriately
     *
     * @var int
     */
    private $priceModifier = 0;

    /**
     * Position in the item group
     *
     * Lower means higher priority
     *
     * @var int
     */
    private $position;

    /**
     * Created at UTC `DATETIME` string
     *
     * @var string
     */
    private $createdAt;

    /**
     * Updated at UTC `DATETIME` string
     *
     * @var string
     */
    private $updatedAt;

    /**
     * Constructs a group item
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param int       $id
     * @param int       $groupId
     * @param int       $welitemSkuMetaId
     * @param string    $itemLabel
     * @param int       $itemQuantity
     * @param int|float $priceModifier
     * @param int       $position
     * @param string    $createdAt
     * @param string    $updatedAt
     * @return void
     */
    public function __construct(
        $id,
        $groupId,
        $welitemSkuMetaId,
        $itemLabel,
        $itemQuantity,
        $priceModifier,
        $position,
        $createdAt,
        $updatedAt
    ) {
        parent::__construct($welitemSkuMetaId);
        $this->id = (int)$id;
        $this->groupId = (int)$groupId;
        $this->itemLabel = $itemLabel;
        $this->itemQuantity = (int)$itemQuantity;
        $this->priceModifier = (float)$priceModifier;
        $this->position = (int)$position;
        $this->createdAt = $createdAt;
        $this->updatedAt = $updatedAt;
    }

    /**
     * Returns key-value representation of the object
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return array
     */
    public function jsonSerialize() {
        return array_merge(
            parent::jsonSerialize(),
            $this->getJson()
        );
    }

    /**
     * Returns key-value array for the group item, excluding item and SKU data
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return (int|string)[]
     */
    public function getJson() {
        return [
            'id' => $this->id,
            'groupId' => $this->groupId,
            'itemLabel' => $this->itemLabel,
            'itemQuantity' => $this->itemQuantity,
            'priceModifier' => $this->priceModifier,
            'position' => $this->position,
            'createdAt' => $this->createdAt,
            'updatedAt' => $this->updatedAt,
        ];
    }

    /**
     * Getter for `$this->id`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int
     */
    public function getId() {
        return $this->id;
    }

    /**
     * Getter for `$this->id`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int
     */
    public function getGroupId() {
        return $this->groupId;
    }

    /**
     * Getter for `$this->itemLabel`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string
     */
    public function getItemLabel() {
        return $this->itemLabel;
    }

    /**
     * Getter for `$this->itemQuantity`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int
     */
    public function getItemQuantity() {
        return $this->itemQuantity;
    }

    /**
     * Getter for `$this->priceModifier`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return float
     */
    public function getPriceModifier() {
        return $this->priceModifier;
    }

    /**
     * Getter for `$this->position`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return int
     */
    public function getPosition() {
        return $this->position;
    }

    /**
     * Getter for `$this->createdAt`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string
     */
    public function getCreatedAt() {
        return $this->createdAt;
    }

    /**
     * Getter for `$this->updatedAt`
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return string
     */
    public function getUpdatedAt() {
        return $this->updatedAt;
    }
}